1286 lines
46 KiB
C
1286 lines
46 KiB
C
/* $OpenBSD: umac.c,v 1.4 2011/10/19 10:39:48 djm Exp $ */
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/* -----------------------------------------------------------------------
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*
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* umac.c -- C Implementation UMAC Message Authentication
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*
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* Version 0.93b of rfc4418.txt -- 2006 July 18
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*
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* For a full description of UMAC message authentication see the UMAC
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* world-wide-web page at http://www.cs.ucdavis.edu/~rogaway/umac
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* Please report bugs and suggestions to the UMAC webpage.
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*
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* Copyright (c) 1999-2006 Ted Krovetz
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and with or without fee, is hereby
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* granted provided that the above copyright notice appears in all copies
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* and in supporting documentation, and that the name of the copyright
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* holder not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior permission.
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*
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* Comments should be directed to Ted Krovetz (tdk@acm.org)
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*
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* ---------------------------------------------------------------------- */
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/* ////////////////////// IMPORTANT NOTES /////////////////////////////////
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*
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* 1) This version does not work properly on messages larger than 16MB
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*
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* 2) If you set the switch to use SSE2, then all data must be 16-byte
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* aligned
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*
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* 3) When calling the function umac(), it is assumed that msg is in
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* a writable buffer of length divisible by 32 bytes. The message itself
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* does not have to fill the entire buffer, but bytes beyond msg may be
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* zeroed.
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*
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* 4) Three free AES implementations are supported by this implementation of
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* UMAC. Paulo Barreto's version is in the public domain and can be found
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* at http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ (search for
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* "Barreto"). The only two files needed are rijndael-alg-fst.c and
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* rijndael-alg-fst.h. Brian Gladman's version is distributed with the GNU
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* Public lisence at http://fp.gladman.plus.com/AES/index.htm. It
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* includes a fast IA-32 assembly version. The OpenSSL crypo library is
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* the third.
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*
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* 5) With FORCE_C_ONLY flags set to 0, incorrect results are sometimes
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* produced under gcc with optimizations set -O3 or higher. Dunno why.
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*
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/////////////////////////////////////////////////////////////////////// */
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/* ---------------------------------------------------------------------- */
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/* --- User Switches ---------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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#ifndef UMAC_OUTPUT_LEN
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#define UMAC_OUTPUT_LEN 8 /* Alowable: 4, 8, 12, 16 */
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#endif
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#if UMAC_OUTPUT_LEN != 4 && UMAC_OUTPUT_LEN != 8 && \
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UMAC_OUTPUT_LEN != 12 && UMAC_OUTPUT_LEN != 16
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# error UMAC_OUTPUT_LEN must be defined to 4, 8, 12 or 16
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#endif
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/* #define FORCE_C_ONLY 1 ANSI C and 64-bit integers req'd */
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/* #define AES_IMPLEMENTAION 1 1 = OpenSSL, 2 = Barreto, 3 = Gladman */
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/* #define SSE2 0 Is SSE2 is available? */
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/* #define RUN_TESTS 0 Run basic correctness/speed tests */
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/* #define UMAC_AE_SUPPORT 0 Enable auhthenticated encrytion */
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/* ---------------------------------------------------------------------- */
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/* -- Global Includes --------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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#include "includes.h"
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#include <sys/types.h>
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#include "xmalloc.h"
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#include "umac.h"
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#include <string.h>
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#include <stdlib.h>
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#include <stddef.h>
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/* ---------------------------------------------------------------------- */
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/* --- Primitive Data Types --- */
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/* ---------------------------------------------------------------------- */
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/* The following assumptions may need change on your system */
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typedef u_int8_t UINT8; /* 1 byte */
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typedef u_int16_t UINT16; /* 2 byte */
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typedef u_int32_t UINT32; /* 4 byte */
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typedef u_int64_t UINT64; /* 8 bytes */
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typedef unsigned int UWORD; /* Register */
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/* ---------------------------------------------------------------------- */
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/* --- Constants -------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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#define UMAC_KEY_LEN 16 /* UMAC takes 16 bytes of external key */
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/* Message "words" are read from memory in an endian-specific manner. */
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/* For this implementation to behave correctly, __LITTLE_ENDIAN__ must */
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/* be set true if the host computer is little-endian. */
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define __LITTLE_ENDIAN__ 1
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#else
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#define __LITTLE_ENDIAN__ 0
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#endif
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ----- Architecture Specific ------------------------------------------ */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ----- Primitive Routines --------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* --- 32-bit by 32-bit to 64-bit Multiplication ------------------------ */
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/* ---------------------------------------------------------------------- */
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#define MUL64(a,b) ((UINT64)((UINT64)(UINT32)(a) * (UINT64)(UINT32)(b)))
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/* ---------------------------------------------------------------------- */
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/* --- Endian Conversion --- Forcing assembly on some platforms */
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/* ---------------------------------------------------------------------- */
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#if HAVE_SWAP32
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#define LOAD_UINT32_REVERSED(p) (swap32(*(UINT32 *)(p)))
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#define STORE_UINT32_REVERSED(p,v) (*(UINT32 *)(p) = swap32(v))
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#else /* HAVE_SWAP32 */
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static UINT32 LOAD_UINT32_REVERSED(void *ptr)
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{
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UINT32 temp = *(UINT32 *)ptr;
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temp = (temp >> 24) | ((temp & 0x00FF0000) >> 8 )
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| ((temp & 0x0000FF00) << 8 ) | (temp << 24);
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return (UINT32)temp;
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}
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# if (__LITTLE_ENDIAN__)
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static void STORE_UINT32_REVERSED(void *ptr, UINT32 x)
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{
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UINT32 i = (UINT32)x;
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*(UINT32 *)ptr = (i >> 24) | ((i & 0x00FF0000) >> 8 )
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| ((i & 0x0000FF00) << 8 ) | (i << 24);
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}
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# endif /* __LITTLE_ENDIAN */
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#endif /* HAVE_SWAP32 */
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/* The following definitions use the above reversal-primitives to do the right
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* thing on endian specific load and stores.
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*/
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#if (__LITTLE_ENDIAN__)
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#define LOAD_UINT32_LITTLE(ptr) (*(UINT32 *)(ptr))
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#define STORE_UINT32_BIG(ptr,x) STORE_UINT32_REVERSED(ptr,x)
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#else
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#define LOAD_UINT32_LITTLE(ptr) LOAD_UINT32_REVERSED(ptr)
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#define STORE_UINT32_BIG(ptr,x) (*(UINT32 *)(ptr) = (UINT32)(x))
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#endif
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ----- Begin KDF & PDF Section ---------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* UMAC uses AES with 16 byte block and key lengths */
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#define AES_BLOCK_LEN 16
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/* OpenSSL's AES */
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#include "openbsd-compat/openssl-compat.h"
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#ifndef USE_BUILTIN_RIJNDAEL
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# include <openssl/aes.h>
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#endif
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typedef AES_KEY aes_int_key[1];
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#define aes_encryption(in,out,int_key) \
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AES_encrypt((u_char *)(in),(u_char *)(out),(AES_KEY *)int_key)
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#define aes_key_setup(key,int_key) \
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AES_set_encrypt_key((u_char *)(key),UMAC_KEY_LEN*8,int_key)
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/* The user-supplied UMAC key is stretched using AES in a counter
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* mode to supply all random bits needed by UMAC. The kdf function takes
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* an AES internal key representation 'key' and writes a stream of
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* 'nbytes' bytes to the memory pointed at by 'bufp'. Each distinct
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* 'ndx' causes a distinct byte stream.
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*/
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static void kdf(void *bufp, aes_int_key key, UINT8 ndx, int nbytes)
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{
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UINT8 in_buf[AES_BLOCK_LEN] = {0};
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UINT8 out_buf[AES_BLOCK_LEN];
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UINT8 *dst_buf = (UINT8 *)bufp;
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int i;
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/* Setup the initial value */
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in_buf[AES_BLOCK_LEN-9] = ndx;
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in_buf[AES_BLOCK_LEN-1] = i = 1;
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while (nbytes >= AES_BLOCK_LEN) {
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aes_encryption(in_buf, out_buf, key);
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memcpy(dst_buf,out_buf,AES_BLOCK_LEN);
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in_buf[AES_BLOCK_LEN-1] = ++i;
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nbytes -= AES_BLOCK_LEN;
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dst_buf += AES_BLOCK_LEN;
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}
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if (nbytes) {
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aes_encryption(in_buf, out_buf, key);
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memcpy(dst_buf,out_buf,nbytes);
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}
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}
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/* The final UHASH result is XOR'd with the output of a pseudorandom
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* function. Here, we use AES to generate random output and
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* xor the appropriate bytes depending on the last bits of nonce.
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* This scheme is optimized for sequential, increasing big-endian nonces.
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*/
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typedef struct {
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UINT8 cache[AES_BLOCK_LEN]; /* Previous AES output is saved */
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UINT8 nonce[AES_BLOCK_LEN]; /* The AES input making above cache */
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aes_int_key prf_key; /* Expanded AES key for PDF */
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} pdf_ctx;
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static void pdf_init(pdf_ctx *pc, aes_int_key prf_key)
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{
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UINT8 buf[UMAC_KEY_LEN];
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kdf(buf, prf_key, 0, UMAC_KEY_LEN);
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aes_key_setup(buf, pc->prf_key);
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/* Initialize pdf and cache */
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memset(pc->nonce, 0, sizeof(pc->nonce));
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aes_encryption(pc->nonce, pc->cache, pc->prf_key);
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}
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static void pdf_gen_xor(pdf_ctx *pc, UINT8 nonce[8], UINT8 buf[8])
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{
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/* 'ndx' indicates that we'll be using the 0th or 1st eight bytes
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* of the AES output. If last time around we returned the ndx-1st
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* element, then we may have the result in the cache already.
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*/
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#if (UMAC_OUTPUT_LEN == 4)
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#define LOW_BIT_MASK 3
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#elif (UMAC_OUTPUT_LEN == 8)
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#define LOW_BIT_MASK 1
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#elif (UMAC_OUTPUT_LEN > 8)
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#define LOW_BIT_MASK 0
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#endif
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UINT8 tmp_nonce_lo[4];
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#if LOW_BIT_MASK != 0
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int ndx = nonce[7] & LOW_BIT_MASK;
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#endif
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*(UINT32 *)tmp_nonce_lo = ((UINT32 *)nonce)[1];
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tmp_nonce_lo[3] &= ~LOW_BIT_MASK; /* zero last bit */
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if ( (((UINT32 *)tmp_nonce_lo)[0] != ((UINT32 *)pc->nonce)[1]) ||
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(((UINT32 *)nonce)[0] != ((UINT32 *)pc->nonce)[0]) )
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{
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((UINT32 *)pc->nonce)[0] = ((UINT32 *)nonce)[0];
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((UINT32 *)pc->nonce)[1] = ((UINT32 *)tmp_nonce_lo)[0];
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aes_encryption(pc->nonce, pc->cache, pc->prf_key);
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}
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#if (UMAC_OUTPUT_LEN == 4)
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*((UINT32 *)buf) ^= ((UINT32 *)pc->cache)[ndx];
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#elif (UMAC_OUTPUT_LEN == 8)
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*((UINT64 *)buf) ^= ((UINT64 *)pc->cache)[ndx];
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#elif (UMAC_OUTPUT_LEN == 12)
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((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0];
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((UINT32 *)buf)[2] ^= ((UINT32 *)pc->cache)[2];
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#elif (UMAC_OUTPUT_LEN == 16)
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((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0];
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((UINT64 *)buf)[1] ^= ((UINT64 *)pc->cache)[1];
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#endif
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}
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* ----- Begin NH Hash Section ------------------------------------------ */
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/* ---------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------- */
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/* The NH-based hash functions used in UMAC are described in the UMAC paper
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* and specification, both of which can be found at the UMAC website.
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* The interface to this implementation has two
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* versions, one expects the entire message being hashed to be passed
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* in a single buffer and returns the hash result immediately. The second
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* allows the message to be passed in a sequence of buffers. In the
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* muliple-buffer interface, the client calls the routine nh_update() as
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* many times as necessary. When there is no more data to be fed to the
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* hash, the client calls nh_final() which calculates the hash output.
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* Before beginning another hash calculation the nh_reset() routine
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* must be called. The single-buffer routine, nh(), is equivalent to
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* the sequence of calls nh_update() and nh_final(); however it is
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* optimized and should be prefered whenever the multiple-buffer interface
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* is not necessary. When using either interface, it is the client's
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* responsability to pass no more than L1_KEY_LEN bytes per hash result.
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*
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* The routine nh_init() initializes the nh_ctx data structure and
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* must be called once, before any other PDF routine.
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*/
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/* The "nh_aux" routines do the actual NH hashing work. They
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* expect buffers to be multiples of L1_PAD_BOUNDARY. These routines
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* produce output for all STREAMS NH iterations in one call,
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* allowing the parallel implementation of the streams.
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*/
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#define STREAMS (UMAC_OUTPUT_LEN / 4) /* Number of times hash is applied */
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#define L1_KEY_LEN 1024 /* Internal key bytes */
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#define L1_KEY_SHIFT 16 /* Toeplitz key shift between streams */
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#define L1_PAD_BOUNDARY 32 /* pad message to boundary multiple */
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#define ALLOC_BOUNDARY 16 /* Keep buffers aligned to this */
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#define HASH_BUF_BYTES 64 /* nh_aux_hb buffer multiple */
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typedef struct {
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UINT8 nh_key [L1_KEY_LEN + L1_KEY_SHIFT * (STREAMS - 1)]; /* NH Key */
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UINT8 data [HASH_BUF_BYTES]; /* Incoming data buffer */
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int next_data_empty; /* Bookeeping variable for data buffer. */
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int bytes_hashed; /* Bytes (out of L1_KEY_LEN) incorperated. */
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UINT64 state[STREAMS]; /* on-line state */
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} nh_ctx;
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#if (UMAC_OUTPUT_LEN == 4)
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static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen)
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/* NH hashing primitive. Previous (partial) hash result is loaded and
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* then stored via hp pointer. The length of the data pointed at by "dp",
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* "dlen", is guaranteed to be divisible by L1_PAD_BOUNDARY (32). Key
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* is expected to be endian compensated in memory at key setup.
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*/
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{
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UINT64 h;
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UWORD c = dlen / 32;
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UINT32 *k = (UINT32 *)kp;
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UINT32 *d = (UINT32 *)dp;
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UINT32 d0,d1,d2,d3,d4,d5,d6,d7;
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UINT32 k0,k1,k2,k3,k4,k5,k6,k7;
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h = *((UINT64 *)hp);
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do {
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d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1);
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d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3);
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d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5);
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d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7);
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k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
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k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
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h += MUL64((k0 + d0), (k4 + d4));
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h += MUL64((k1 + d1), (k5 + d5));
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h += MUL64((k2 + d2), (k6 + d6));
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h += MUL64((k3 + d3), (k7 + d7));
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d += 8;
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k += 8;
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} while (--c);
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*((UINT64 *)hp) = h;
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}
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#elif (UMAC_OUTPUT_LEN == 8)
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static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen)
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/* Same as previous nh_aux, but two streams are handled in one pass,
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* reading and writing 16 bytes of hash-state per call.
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*/
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{
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UINT64 h1,h2;
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UWORD c = dlen / 32;
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UINT32 *k = (UINT32 *)kp;
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UINT32 *d = (UINT32 *)dp;
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UINT32 d0,d1,d2,d3,d4,d5,d6,d7;
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UINT32 k0,k1,k2,k3,k4,k5,k6,k7,
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k8,k9,k10,k11;
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h1 = *((UINT64 *)hp);
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h2 = *((UINT64 *)hp + 1);
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k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
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do {
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d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1);
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d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3);
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d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5);
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d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7);
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k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
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k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11);
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h1 += MUL64((k0 + d0), (k4 + d4));
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h2 += MUL64((k4 + d0), (k8 + d4));
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h1 += MUL64((k1 + d1), (k5 + d5));
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h2 += MUL64((k5 + d1), (k9 + d5));
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h1 += MUL64((k2 + d2), (k6 + d6));
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h2 += MUL64((k6 + d2), (k10 + d6));
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h1 += MUL64((k3 + d3), (k7 + d7));
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h2 += MUL64((k7 + d3), (k11 + d7));
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k0 = k8; k1 = k9; k2 = k10; k3 = k11;
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d += 8;
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k += 8;
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} while (--c);
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((UINT64 *)hp)[0] = h1;
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((UINT64 *)hp)[1] = h2;
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}
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#elif (UMAC_OUTPUT_LEN == 12)
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static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen)
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/* Same as previous nh_aux, but two streams are handled in one pass,
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* reading and writing 24 bytes of hash-state per call.
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*/
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{
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UINT64 h1,h2,h3;
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UWORD c = dlen / 32;
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UINT32 *k = (UINT32 *)kp;
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UINT32 *d = (UINT32 *)dp;
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UINT32 d0,d1,d2,d3,d4,d5,d6,d7;
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UINT32 k0,k1,k2,k3,k4,k5,k6,k7,
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k8,k9,k10,k11,k12,k13,k14,k15;
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h1 = *((UINT64 *)hp);
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h2 = *((UINT64 *)hp + 1);
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h3 = *((UINT64 *)hp + 2);
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k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
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k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
|
|
do {
|
|
d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1);
|
|
d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3);
|
|
d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5);
|
|
d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7);
|
|
k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11);
|
|
k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15);
|
|
|
|
h1 += MUL64((k0 + d0), (k4 + d4));
|
|
h2 += MUL64((k4 + d0), (k8 + d4));
|
|
h3 += MUL64((k8 + d0), (k12 + d4));
|
|
|
|
h1 += MUL64((k1 + d1), (k5 + d5));
|
|
h2 += MUL64((k5 + d1), (k9 + d5));
|
|
h3 += MUL64((k9 + d1), (k13 + d5));
|
|
|
|
h1 += MUL64((k2 + d2), (k6 + d6));
|
|
h2 += MUL64((k6 + d2), (k10 + d6));
|
|
h3 += MUL64((k10 + d2), (k14 + d6));
|
|
|
|
h1 += MUL64((k3 + d3), (k7 + d7));
|
|
h2 += MUL64((k7 + d3), (k11 + d7));
|
|
h3 += MUL64((k11 + d3), (k15 + d7));
|
|
|
|
k0 = k8; k1 = k9; k2 = k10; k3 = k11;
|
|
k4 = k12; k5 = k13; k6 = k14; k7 = k15;
|
|
|
|
d += 8;
|
|
k += 8;
|
|
} while (--c);
|
|
((UINT64 *)hp)[0] = h1;
|
|
((UINT64 *)hp)[1] = h2;
|
|
((UINT64 *)hp)[2] = h3;
|
|
}
|
|
|
|
#elif (UMAC_OUTPUT_LEN == 16)
|
|
|
|
static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen)
|
|
/* Same as previous nh_aux, but two streams are handled in one pass,
|
|
* reading and writing 24 bytes of hash-state per call.
|
|
*/
|
|
{
|
|
UINT64 h1,h2,h3,h4;
|
|
UWORD c = dlen / 32;
|
|
UINT32 *k = (UINT32 *)kp;
|
|
UINT32 *d = (UINT32 *)dp;
|
|
UINT32 d0,d1,d2,d3,d4,d5,d6,d7;
|
|
UINT32 k0,k1,k2,k3,k4,k5,k6,k7,
|
|
k8,k9,k10,k11,k12,k13,k14,k15,
|
|
k16,k17,k18,k19;
|
|
|
|
h1 = *((UINT64 *)hp);
|
|
h2 = *((UINT64 *)hp + 1);
|
|
h3 = *((UINT64 *)hp + 2);
|
|
h4 = *((UINT64 *)hp + 3);
|
|
k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
|
|
k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
|
|
do {
|
|
d0 = LOAD_UINT32_LITTLE(d+0); d1 = LOAD_UINT32_LITTLE(d+1);
|
|
d2 = LOAD_UINT32_LITTLE(d+2); d3 = LOAD_UINT32_LITTLE(d+3);
|
|
d4 = LOAD_UINT32_LITTLE(d+4); d5 = LOAD_UINT32_LITTLE(d+5);
|
|
d6 = LOAD_UINT32_LITTLE(d+6); d7 = LOAD_UINT32_LITTLE(d+7);
|
|
k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11);
|
|
k12 = *(k+12); k13 = *(k+13); k14 = *(k+14); k15 = *(k+15);
|
|
k16 = *(k+16); k17 = *(k+17); k18 = *(k+18); k19 = *(k+19);
|
|
|
|
h1 += MUL64((k0 + d0), (k4 + d4));
|
|
h2 += MUL64((k4 + d0), (k8 + d4));
|
|
h3 += MUL64((k8 + d0), (k12 + d4));
|
|
h4 += MUL64((k12 + d0), (k16 + d4));
|
|
|
|
h1 += MUL64((k1 + d1), (k5 + d5));
|
|
h2 += MUL64((k5 + d1), (k9 + d5));
|
|
h3 += MUL64((k9 + d1), (k13 + d5));
|
|
h4 += MUL64((k13 + d1), (k17 + d5));
|
|
|
|
h1 += MUL64((k2 + d2), (k6 + d6));
|
|
h2 += MUL64((k6 + d2), (k10 + d6));
|
|
h3 += MUL64((k10 + d2), (k14 + d6));
|
|
h4 += MUL64((k14 + d2), (k18 + d6));
|
|
|
|
h1 += MUL64((k3 + d3), (k7 + d7));
|
|
h2 += MUL64((k7 + d3), (k11 + d7));
|
|
h3 += MUL64((k11 + d3), (k15 + d7));
|
|
h4 += MUL64((k15 + d3), (k19 + d7));
|
|
|
|
k0 = k8; k1 = k9; k2 = k10; k3 = k11;
|
|
k4 = k12; k5 = k13; k6 = k14; k7 = k15;
|
|
k8 = k16; k9 = k17; k10 = k18; k11 = k19;
|
|
|
|
d += 8;
|
|
k += 8;
|
|
} while (--c);
|
|
((UINT64 *)hp)[0] = h1;
|
|
((UINT64 *)hp)[1] = h2;
|
|
((UINT64 *)hp)[2] = h3;
|
|
((UINT64 *)hp)[3] = h4;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
#endif /* UMAC_OUTPUT_LENGTH */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void nh_transform(nh_ctx *hc, UINT8 *buf, UINT32 nbytes)
|
|
/* This function is a wrapper for the primitive NH hash functions. It takes
|
|
* as argument "hc" the current hash context and a buffer which must be a
|
|
* multiple of L1_PAD_BOUNDARY. The key passed to nh_aux is offset
|
|
* appropriately according to how much message has been hashed already.
|
|
*/
|
|
{
|
|
UINT8 *key;
|
|
|
|
key = hc->nh_key + hc->bytes_hashed;
|
|
nh_aux(key, buf, hc->state, nbytes);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#if (__LITTLE_ENDIAN__)
|
|
static void endian_convert(void *buf, UWORD bpw, UINT32 num_bytes)
|
|
/* We endian convert the keys on little-endian computers to */
|
|
/* compensate for the lack of big-endian memory reads during hashing. */
|
|
{
|
|
UWORD iters = num_bytes / bpw;
|
|
if (bpw == 4) {
|
|
UINT32 *p = (UINT32 *)buf;
|
|
do {
|
|
*p = LOAD_UINT32_REVERSED(p);
|
|
p++;
|
|
} while (--iters);
|
|
} else if (bpw == 8) {
|
|
UINT32 *p = (UINT32 *)buf;
|
|
UINT32 t;
|
|
do {
|
|
t = LOAD_UINT32_REVERSED(p+1);
|
|
p[1] = LOAD_UINT32_REVERSED(p);
|
|
p[0] = t;
|
|
p += 2;
|
|
} while (--iters);
|
|
}
|
|
}
|
|
#define endian_convert_if_le(x,y,z) endian_convert((x),(y),(z))
|
|
#else
|
|
#define endian_convert_if_le(x,y,z) do{}while(0) /* Do nothing */
|
|
#endif
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void nh_reset(nh_ctx *hc)
|
|
/* Reset nh_ctx to ready for hashing of new data */
|
|
{
|
|
hc->bytes_hashed = 0;
|
|
hc->next_data_empty = 0;
|
|
hc->state[0] = 0;
|
|
#if (UMAC_OUTPUT_LEN >= 8)
|
|
hc->state[1] = 0;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN >= 12)
|
|
hc->state[2] = 0;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN == 16)
|
|
hc->state[3] = 0;
|
|
#endif
|
|
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void nh_init(nh_ctx *hc, aes_int_key prf_key)
|
|
/* Generate nh_key, endian convert and reset to be ready for hashing. */
|
|
{
|
|
kdf(hc->nh_key, prf_key, 1, sizeof(hc->nh_key));
|
|
endian_convert_if_le(hc->nh_key, 4, sizeof(hc->nh_key));
|
|
nh_reset(hc);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void nh_update(nh_ctx *hc, UINT8 *buf, UINT32 nbytes)
|
|
/* Incorporate nbytes of data into a nh_ctx, buffer whatever is not an */
|
|
/* even multiple of HASH_BUF_BYTES. */
|
|
{
|
|
UINT32 i,j;
|
|
|
|
j = hc->next_data_empty;
|
|
if ((j + nbytes) >= HASH_BUF_BYTES) {
|
|
if (j) {
|
|
i = HASH_BUF_BYTES - j;
|
|
memcpy(hc->data+j, buf, i);
|
|
nh_transform(hc,hc->data,HASH_BUF_BYTES);
|
|
nbytes -= i;
|
|
buf += i;
|
|
hc->bytes_hashed += HASH_BUF_BYTES;
|
|
}
|
|
if (nbytes >= HASH_BUF_BYTES) {
|
|
i = nbytes & ~(HASH_BUF_BYTES - 1);
|
|
nh_transform(hc, buf, i);
|
|
nbytes -= i;
|
|
buf += i;
|
|
hc->bytes_hashed += i;
|
|
}
|
|
j = 0;
|
|
}
|
|
memcpy(hc->data + j, buf, nbytes);
|
|
hc->next_data_empty = j + nbytes;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void zero_pad(UINT8 *p, int nbytes)
|
|
{
|
|
/* Write "nbytes" of zeroes, beginning at "p" */
|
|
if (nbytes >= (int)sizeof(UWORD)) {
|
|
while ((ptrdiff_t)p % sizeof(UWORD)) {
|
|
*p = 0;
|
|
nbytes--;
|
|
p++;
|
|
}
|
|
while (nbytes >= (int)sizeof(UWORD)) {
|
|
*(UWORD *)p = 0;
|
|
nbytes -= sizeof(UWORD);
|
|
p += sizeof(UWORD);
|
|
}
|
|
}
|
|
while (nbytes) {
|
|
*p = 0;
|
|
nbytes--;
|
|
p++;
|
|
}
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void nh_final(nh_ctx *hc, UINT8 *result)
|
|
/* After passing some number of data buffers to nh_update() for integration
|
|
* into an NH context, nh_final is called to produce a hash result. If any
|
|
* bytes are in the buffer hc->data, incorporate them into the
|
|
* NH context. Finally, add into the NH accumulation "state" the total number
|
|
* of bits hashed. The resulting numbers are written to the buffer "result".
|
|
* If nh_update was never called, L1_PAD_BOUNDARY zeroes are incorporated.
|
|
*/
|
|
{
|
|
int nh_len, nbits;
|
|
|
|
if (hc->next_data_empty != 0) {
|
|
nh_len = ((hc->next_data_empty + (L1_PAD_BOUNDARY - 1)) &
|
|
~(L1_PAD_BOUNDARY - 1));
|
|
zero_pad(hc->data + hc->next_data_empty,
|
|
nh_len - hc->next_data_empty);
|
|
nh_transform(hc, hc->data, nh_len);
|
|
hc->bytes_hashed += hc->next_data_empty;
|
|
} else if (hc->bytes_hashed == 0) {
|
|
nh_len = L1_PAD_BOUNDARY;
|
|
zero_pad(hc->data, L1_PAD_BOUNDARY);
|
|
nh_transform(hc, hc->data, nh_len);
|
|
}
|
|
|
|
nbits = (hc->bytes_hashed << 3);
|
|
((UINT64 *)result)[0] = ((UINT64 *)hc->state)[0] + nbits;
|
|
#if (UMAC_OUTPUT_LEN >= 8)
|
|
((UINT64 *)result)[1] = ((UINT64 *)hc->state)[1] + nbits;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN >= 12)
|
|
((UINT64 *)result)[2] = ((UINT64 *)hc->state)[2] + nbits;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN == 16)
|
|
((UINT64 *)result)[3] = ((UINT64 *)hc->state)[3] + nbits;
|
|
#endif
|
|
nh_reset(hc);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static void nh(nh_ctx *hc, UINT8 *buf, UINT32 padded_len,
|
|
UINT32 unpadded_len, UINT8 *result)
|
|
/* All-in-one nh_update() and nh_final() equivalent.
|
|
* Assumes that padded_len is divisible by L1_PAD_BOUNDARY and result is
|
|
* well aligned
|
|
*/
|
|
{
|
|
UINT32 nbits;
|
|
|
|
/* Initialize the hash state */
|
|
nbits = (unpadded_len << 3);
|
|
|
|
((UINT64 *)result)[0] = nbits;
|
|
#if (UMAC_OUTPUT_LEN >= 8)
|
|
((UINT64 *)result)[1] = nbits;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN >= 12)
|
|
((UINT64 *)result)[2] = nbits;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN == 16)
|
|
((UINT64 *)result)[3] = nbits;
|
|
#endif
|
|
|
|
nh_aux(hc->nh_key, buf, result, padded_len);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ----- Begin UHASH Section -------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* UHASH is a multi-layered algorithm. Data presented to UHASH is first
|
|
* hashed by NH. The NH output is then hashed by a polynomial-hash layer
|
|
* unless the initial data to be hashed is short. After the polynomial-
|
|
* layer, an inner-product hash is used to produce the final UHASH output.
|
|
*
|
|
* UHASH provides two interfaces, one all-at-once and another where data
|
|
* buffers are presented sequentially. In the sequential interface, the
|
|
* UHASH client calls the routine uhash_update() as many times as necessary.
|
|
* When there is no more data to be fed to UHASH, the client calls
|
|
* uhash_final() which
|
|
* calculates the UHASH output. Before beginning another UHASH calculation
|
|
* the uhash_reset() routine must be called. The all-at-once UHASH routine,
|
|
* uhash(), is equivalent to the sequence of calls uhash_update() and
|
|
* uhash_final(); however it is optimized and should be
|
|
* used whenever the sequential interface is not necessary.
|
|
*
|
|
* The routine uhash_init() initializes the uhash_ctx data structure and
|
|
* must be called once, before any other UHASH routine.
|
|
*/
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ----- Constants and uhash_ctx ---------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ----- Poly hash and Inner-Product hash Constants --------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* Primes and masks */
|
|
#define p36 ((UINT64)0x0000000FFFFFFFFBull) /* 2^36 - 5 */
|
|
#define p64 ((UINT64)0xFFFFFFFFFFFFFFC5ull) /* 2^64 - 59 */
|
|
#define m36 ((UINT64)0x0000000FFFFFFFFFull) /* The low 36 of 64 bits */
|
|
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
typedef struct uhash_ctx {
|
|
nh_ctx hash; /* Hash context for L1 NH hash */
|
|
UINT64 poly_key_8[STREAMS]; /* p64 poly keys */
|
|
UINT64 poly_accum[STREAMS]; /* poly hash result */
|
|
UINT64 ip_keys[STREAMS*4]; /* Inner-product keys */
|
|
UINT32 ip_trans[STREAMS]; /* Inner-product translation */
|
|
UINT32 msg_len; /* Total length of data passed */
|
|
/* to uhash */
|
|
} uhash_ctx;
|
|
typedef struct uhash_ctx *uhash_ctx_t;
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
|
|
/* The polynomial hashes use Horner's rule to evaluate a polynomial one
|
|
* word at a time. As described in the specification, poly32 and poly64
|
|
* require keys from special domains. The following implementations exploit
|
|
* the special domains to avoid overflow. The results are not guaranteed to
|
|
* be within Z_p32 and Z_p64, but the Inner-Product hash implementation
|
|
* patches any errant values.
|
|
*/
|
|
|
|
static UINT64 poly64(UINT64 cur, UINT64 key, UINT64 data)
|
|
{
|
|
UINT32 key_hi = (UINT32)(key >> 32),
|
|
key_lo = (UINT32)key,
|
|
cur_hi = (UINT32)(cur >> 32),
|
|
cur_lo = (UINT32)cur,
|
|
x_lo,
|
|
x_hi;
|
|
UINT64 X,T,res;
|
|
|
|
X = MUL64(key_hi, cur_lo) + MUL64(cur_hi, key_lo);
|
|
x_lo = (UINT32)X;
|
|
x_hi = (UINT32)(X >> 32);
|
|
|
|
res = (MUL64(key_hi, cur_hi) + x_hi) * 59 + MUL64(key_lo, cur_lo);
|
|
|
|
T = ((UINT64)x_lo << 32);
|
|
res += T;
|
|
if (res < T)
|
|
res += 59;
|
|
|
|
res += data;
|
|
if (res < data)
|
|
res += 59;
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/* Although UMAC is specified to use a ramped polynomial hash scheme, this
|
|
* implementation does not handle all ramp levels. Because we don't handle
|
|
* the ramp up to p128 modulus in this implementation, we are limited to
|
|
* 2^14 poly_hash() invocations per stream (for a total capacity of 2^24
|
|
* bytes input to UMAC per tag, ie. 16MB).
|
|
*/
|
|
static void poly_hash(uhash_ctx_t hc, UINT32 data_in[])
|
|
{
|
|
int i;
|
|
UINT64 *data=(UINT64*)data_in;
|
|
|
|
for (i = 0; i < STREAMS; i++) {
|
|
if ((UINT32)(data[i] >> 32) == 0xfffffffful) {
|
|
hc->poly_accum[i] = poly64(hc->poly_accum[i],
|
|
hc->poly_key_8[i], p64 - 1);
|
|
hc->poly_accum[i] = poly64(hc->poly_accum[i],
|
|
hc->poly_key_8[i], (data[i] - 59));
|
|
} else {
|
|
hc->poly_accum[i] = poly64(hc->poly_accum[i],
|
|
hc->poly_key_8[i], data[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
|
|
/* The final step in UHASH is an inner-product hash. The poly hash
|
|
* produces a result not neccesarily WORD_LEN bytes long. The inner-
|
|
* product hash breaks the polyhash output into 16-bit chunks and
|
|
* multiplies each with a 36 bit key.
|
|
*/
|
|
|
|
static UINT64 ip_aux(UINT64 t, UINT64 *ipkp, UINT64 data)
|
|
{
|
|
t = t + ipkp[0] * (UINT64)(UINT16)(data >> 48);
|
|
t = t + ipkp[1] * (UINT64)(UINT16)(data >> 32);
|
|
t = t + ipkp[2] * (UINT64)(UINT16)(data >> 16);
|
|
t = t + ipkp[3] * (UINT64)(UINT16)(data);
|
|
|
|
return t;
|
|
}
|
|
|
|
static UINT32 ip_reduce_p36(UINT64 t)
|
|
{
|
|
/* Divisionless modular reduction */
|
|
UINT64 ret;
|
|
|
|
ret = (t & m36) + 5 * (t >> 36);
|
|
if (ret >= p36)
|
|
ret -= p36;
|
|
|
|
/* return least significant 32 bits */
|
|
return (UINT32)(ret);
|
|
}
|
|
|
|
|
|
/* If the data being hashed by UHASH is no longer than L1_KEY_LEN, then
|
|
* the polyhash stage is skipped and ip_short is applied directly to the
|
|
* NH output.
|
|
*/
|
|
static void ip_short(uhash_ctx_t ahc, UINT8 *nh_res, u_char *res)
|
|
{
|
|
UINT64 t;
|
|
UINT64 *nhp = (UINT64 *)nh_res;
|
|
|
|
t = ip_aux(0,ahc->ip_keys, nhp[0]);
|
|
STORE_UINT32_BIG((UINT32 *)res+0, ip_reduce_p36(t) ^ ahc->ip_trans[0]);
|
|
#if (UMAC_OUTPUT_LEN >= 8)
|
|
t = ip_aux(0,ahc->ip_keys+4, nhp[1]);
|
|
STORE_UINT32_BIG((UINT32 *)res+1, ip_reduce_p36(t) ^ ahc->ip_trans[1]);
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN >= 12)
|
|
t = ip_aux(0,ahc->ip_keys+8, nhp[2]);
|
|
STORE_UINT32_BIG((UINT32 *)res+2, ip_reduce_p36(t) ^ ahc->ip_trans[2]);
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN == 16)
|
|
t = ip_aux(0,ahc->ip_keys+12, nhp[3]);
|
|
STORE_UINT32_BIG((UINT32 *)res+3, ip_reduce_p36(t) ^ ahc->ip_trans[3]);
|
|
#endif
|
|
}
|
|
|
|
/* If the data being hashed by UHASH is longer than L1_KEY_LEN, then
|
|
* the polyhash stage is not skipped and ip_long is applied to the
|
|
* polyhash output.
|
|
*/
|
|
static void ip_long(uhash_ctx_t ahc, u_char *res)
|
|
{
|
|
int i;
|
|
UINT64 t;
|
|
|
|
for (i = 0; i < STREAMS; i++) {
|
|
/* fix polyhash output not in Z_p64 */
|
|
if (ahc->poly_accum[i] >= p64)
|
|
ahc->poly_accum[i] -= p64;
|
|
t = ip_aux(0,ahc->ip_keys+(i*4), ahc->poly_accum[i]);
|
|
STORE_UINT32_BIG((UINT32 *)res+i,
|
|
ip_reduce_p36(t) ^ ahc->ip_trans[i]);
|
|
}
|
|
}
|
|
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* Reset uhash context for next hash session */
|
|
static int uhash_reset(uhash_ctx_t pc)
|
|
{
|
|
nh_reset(&pc->hash);
|
|
pc->msg_len = 0;
|
|
pc->poly_accum[0] = 1;
|
|
#if (UMAC_OUTPUT_LEN >= 8)
|
|
pc->poly_accum[1] = 1;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN >= 12)
|
|
pc->poly_accum[2] = 1;
|
|
#endif
|
|
#if (UMAC_OUTPUT_LEN == 16)
|
|
pc->poly_accum[3] = 1;
|
|
#endif
|
|
return 1;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* Given a pointer to the internal key needed by kdf() and a uhash context,
|
|
* initialize the NH context and generate keys needed for poly and inner-
|
|
* product hashing. All keys are endian adjusted in memory so that native
|
|
* loads cause correct keys to be in registers during calculation.
|
|
*/
|
|
static void uhash_init(uhash_ctx_t ahc, aes_int_key prf_key)
|
|
{
|
|
int i;
|
|
UINT8 buf[(8*STREAMS+4)*sizeof(UINT64)];
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|
|
|
/* Zero the entire uhash context */
|
|
memset(ahc, 0, sizeof(uhash_ctx));
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|
|
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/* Initialize the L1 hash */
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nh_init(&ahc->hash, prf_key);
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|
|
|
/* Setup L2 hash variables */
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|
kdf(buf, prf_key, 2, sizeof(buf)); /* Fill buffer with index 1 key */
|
|
for (i = 0; i < STREAMS; i++) {
|
|
/* Fill keys from the buffer, skipping bytes in the buffer not
|
|
* used by this implementation. Endian reverse the keys if on a
|
|
* little-endian computer.
|
|
*/
|
|
memcpy(ahc->poly_key_8+i, buf+24*i, 8);
|
|
endian_convert_if_le(ahc->poly_key_8+i, 8, 8);
|
|
/* Mask the 64-bit keys to their special domain */
|
|
ahc->poly_key_8[i] &= ((UINT64)0x01ffffffu << 32) + 0x01ffffffu;
|
|
ahc->poly_accum[i] = 1; /* Our polyhash prepends a non-zero word */
|
|
}
|
|
|
|
/* Setup L3-1 hash variables */
|
|
kdf(buf, prf_key, 3, sizeof(buf)); /* Fill buffer with index 2 key */
|
|
for (i = 0; i < STREAMS; i++)
|
|
memcpy(ahc->ip_keys+4*i, buf+(8*i+4)*sizeof(UINT64),
|
|
4*sizeof(UINT64));
|
|
endian_convert_if_le(ahc->ip_keys, sizeof(UINT64),
|
|
sizeof(ahc->ip_keys));
|
|
for (i = 0; i < STREAMS*4; i++)
|
|
ahc->ip_keys[i] %= p36; /* Bring into Z_p36 */
|
|
|
|
/* Setup L3-2 hash variables */
|
|
/* Fill buffer with index 4 key */
|
|
kdf(ahc->ip_trans, prf_key, 4, STREAMS * sizeof(UINT32));
|
|
endian_convert_if_le(ahc->ip_trans, sizeof(UINT32),
|
|
STREAMS * sizeof(UINT32));
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#if 0
|
|
static uhash_ctx_t uhash_alloc(u_char key[])
|
|
{
|
|
/* Allocate memory and force to a 16-byte boundary. */
|
|
uhash_ctx_t ctx;
|
|
u_char bytes_to_add;
|
|
aes_int_key prf_key;
|
|
|
|
ctx = (uhash_ctx_t)malloc(sizeof(uhash_ctx)+ALLOC_BOUNDARY);
|
|
if (ctx) {
|
|
if (ALLOC_BOUNDARY) {
|
|
bytes_to_add = ALLOC_BOUNDARY -
|
|
((ptrdiff_t)ctx & (ALLOC_BOUNDARY -1));
|
|
ctx = (uhash_ctx_t)((u_char *)ctx + bytes_to_add);
|
|
*((u_char *)ctx - 1) = bytes_to_add;
|
|
}
|
|
aes_key_setup(key,prf_key);
|
|
uhash_init(ctx, prf_key);
|
|
}
|
|
return (ctx);
|
|
}
|
|
#endif
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#if 0
|
|
static int uhash_free(uhash_ctx_t ctx)
|
|
{
|
|
/* Free memory allocated by uhash_alloc */
|
|
u_char bytes_to_sub;
|
|
|
|
if (ctx) {
|
|
if (ALLOC_BOUNDARY) {
|
|
bytes_to_sub = *((u_char *)ctx - 1);
|
|
ctx = (uhash_ctx_t)((u_char *)ctx - bytes_to_sub);
|
|
}
|
|
free(ctx);
|
|
}
|
|
return (1);
|
|
}
|
|
#endif
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static int uhash_update(uhash_ctx_t ctx, u_char *input, long len)
|
|
/* Given len bytes of data, we parse it into L1_KEY_LEN chunks and
|
|
* hash each one with NH, calling the polyhash on each NH output.
|
|
*/
|
|
{
|
|
UWORD bytes_hashed, bytes_remaining;
|
|
UINT64 result_buf[STREAMS];
|
|
UINT8 *nh_result = (UINT8 *)&result_buf;
|
|
|
|
if (ctx->msg_len + len <= L1_KEY_LEN) {
|
|
nh_update(&ctx->hash, (UINT8 *)input, len);
|
|
ctx->msg_len += len;
|
|
} else {
|
|
|
|
bytes_hashed = ctx->msg_len % L1_KEY_LEN;
|
|
if (ctx->msg_len == L1_KEY_LEN)
|
|
bytes_hashed = L1_KEY_LEN;
|
|
|
|
if (bytes_hashed + len >= L1_KEY_LEN) {
|
|
|
|
/* If some bytes have been passed to the hash function */
|
|
/* then we want to pass at most (L1_KEY_LEN - bytes_hashed) */
|
|
/* bytes to complete the current nh_block. */
|
|
if (bytes_hashed) {
|
|
bytes_remaining = (L1_KEY_LEN - bytes_hashed);
|
|
nh_update(&ctx->hash, (UINT8 *)input, bytes_remaining);
|
|
nh_final(&ctx->hash, nh_result);
|
|
ctx->msg_len += bytes_remaining;
|
|
poly_hash(ctx,(UINT32 *)nh_result);
|
|
len -= bytes_remaining;
|
|
input += bytes_remaining;
|
|
}
|
|
|
|
/* Hash directly from input stream if enough bytes */
|
|
while (len >= L1_KEY_LEN) {
|
|
nh(&ctx->hash, (UINT8 *)input, L1_KEY_LEN,
|
|
L1_KEY_LEN, nh_result);
|
|
ctx->msg_len += L1_KEY_LEN;
|
|
len -= L1_KEY_LEN;
|
|
input += L1_KEY_LEN;
|
|
poly_hash(ctx,(UINT32 *)nh_result);
|
|
}
|
|
}
|
|
|
|
/* pass remaining < L1_KEY_LEN bytes of input data to NH */
|
|
if (len) {
|
|
nh_update(&ctx->hash, (UINT8 *)input, len);
|
|
ctx->msg_len += len;
|
|
}
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static int uhash_final(uhash_ctx_t ctx, u_char *res)
|
|
/* Incorporate any pending data, pad, and generate tag */
|
|
{
|
|
UINT64 result_buf[STREAMS];
|
|
UINT8 *nh_result = (UINT8 *)&result_buf;
|
|
|
|
if (ctx->msg_len > L1_KEY_LEN) {
|
|
if (ctx->msg_len % L1_KEY_LEN) {
|
|
nh_final(&ctx->hash, nh_result);
|
|
poly_hash(ctx,(UINT32 *)nh_result);
|
|
}
|
|
ip_long(ctx, res);
|
|
} else {
|
|
nh_final(&ctx->hash, nh_result);
|
|
ip_short(ctx,nh_result, res);
|
|
}
|
|
uhash_reset(ctx);
|
|
return (1);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#if 0
|
|
static int uhash(uhash_ctx_t ahc, u_char *msg, long len, u_char *res)
|
|
/* assumes that msg is in a writable buffer of length divisible by */
|
|
/* L1_PAD_BOUNDARY. Bytes beyond msg[len] may be zeroed. */
|
|
{
|
|
UINT8 nh_result[STREAMS*sizeof(UINT64)];
|
|
UINT32 nh_len;
|
|
int extra_zeroes_needed;
|
|
|
|
/* If the message to be hashed is no longer than L1_HASH_LEN, we skip
|
|
* the polyhash.
|
|
*/
|
|
if (len <= L1_KEY_LEN) {
|
|
if (len == 0) /* If zero length messages will not */
|
|
nh_len = L1_PAD_BOUNDARY; /* be seen, comment out this case */
|
|
else
|
|
nh_len = ((len + (L1_PAD_BOUNDARY - 1)) & ~(L1_PAD_BOUNDARY - 1));
|
|
extra_zeroes_needed = nh_len - len;
|
|
zero_pad((UINT8 *)msg + len, extra_zeroes_needed);
|
|
nh(&ahc->hash, (UINT8 *)msg, nh_len, len, nh_result);
|
|
ip_short(ahc,nh_result, res);
|
|
} else {
|
|
/* Otherwise, we hash each L1_KEY_LEN chunk with NH, passing the NH
|
|
* output to poly_hash().
|
|
*/
|
|
do {
|
|
nh(&ahc->hash, (UINT8 *)msg, L1_KEY_LEN, L1_KEY_LEN, nh_result);
|
|
poly_hash(ahc,(UINT32 *)nh_result);
|
|
len -= L1_KEY_LEN;
|
|
msg += L1_KEY_LEN;
|
|
} while (len >= L1_KEY_LEN);
|
|
if (len) {
|
|
nh_len = ((len + (L1_PAD_BOUNDARY - 1)) & ~(L1_PAD_BOUNDARY - 1));
|
|
extra_zeroes_needed = nh_len - len;
|
|
zero_pad((UINT8 *)msg + len, extra_zeroes_needed);
|
|
nh(&ahc->hash, (UINT8 *)msg, nh_len, len, nh_result);
|
|
poly_hash(ahc,(UINT32 *)nh_result);
|
|
}
|
|
|
|
ip_long(ahc, res);
|
|
}
|
|
|
|
uhash_reset(ahc);
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ----- Begin UMAC Section --------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/* The UMAC interface has two interfaces, an all-at-once interface where
|
|
* the entire message to be authenticated is passed to UMAC in one buffer,
|
|
* and a sequential interface where the message is presented a little at a
|
|
* time. The all-at-once is more optimaized than the sequential version and
|
|
* should be preferred when the sequential interface is not required.
|
|
*/
|
|
struct umac_ctx {
|
|
uhash_ctx hash; /* Hash function for message compression */
|
|
pdf_ctx pdf; /* PDF for hashed output */
|
|
void *free_ptr; /* Address to free this struct via */
|
|
} umac_ctx;
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#if 0
|
|
int umac_reset(struct umac_ctx *ctx)
|
|
/* Reset the hash function to begin a new authentication. */
|
|
{
|
|
uhash_reset(&ctx->hash);
|
|
return (1);
|
|
}
|
|
#endif
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
int umac_delete(struct umac_ctx *ctx)
|
|
/* Deallocate the ctx structure */
|
|
{
|
|
if (ctx) {
|
|
if (ALLOC_BOUNDARY)
|
|
ctx = (struct umac_ctx *)ctx->free_ptr;
|
|
xfree(ctx);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
struct umac_ctx *umac_new(u_char key[])
|
|
/* Dynamically allocate a umac_ctx struct, initialize variables,
|
|
* generate subkeys from key. Align to 16-byte boundary.
|
|
*/
|
|
{
|
|
struct umac_ctx *ctx, *octx;
|
|
size_t bytes_to_add;
|
|
aes_int_key prf_key;
|
|
|
|
octx = ctx = xmalloc(sizeof(*ctx) + ALLOC_BOUNDARY);
|
|
if (ctx) {
|
|
if (ALLOC_BOUNDARY) {
|
|
bytes_to_add = ALLOC_BOUNDARY -
|
|
((ptrdiff_t)ctx & (ALLOC_BOUNDARY - 1));
|
|
ctx = (struct umac_ctx *)((u_char *)ctx + bytes_to_add);
|
|
}
|
|
ctx->free_ptr = octx;
|
|
aes_key_setup(key,prf_key);
|
|
pdf_init(&ctx->pdf, prf_key);
|
|
uhash_init(&ctx->hash, prf_key);
|
|
}
|
|
|
|
return (ctx);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
int umac_final(struct umac_ctx *ctx, u_char tag[], u_char nonce[8])
|
|
/* Incorporate any pending data, pad, and generate tag */
|
|
{
|
|
uhash_final(&ctx->hash, (u_char *)tag);
|
|
pdf_gen_xor(&ctx->pdf, (UINT8 *)nonce, (UINT8 *)tag);
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
int umac_update(struct umac_ctx *ctx, u_char *input, long len)
|
|
/* Given len bytes of data, we parse it into L1_KEY_LEN chunks and */
|
|
/* hash each one, calling the PDF on the hashed output whenever the hash- */
|
|
/* output buffer is full. */
|
|
{
|
|
uhash_update(&ctx->hash, input, len);
|
|
return (1);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#if 0
|
|
int umac(struct umac_ctx *ctx, u_char *input,
|
|
long len, u_char tag[],
|
|
u_char nonce[8])
|
|
/* All-in-one version simply calls umac_update() and umac_final(). */
|
|
{
|
|
uhash(&ctx->hash, input, len, (u_char *)tag);
|
|
pdf_gen_xor(&ctx->pdf, (UINT8 *)nonce, (UINT8 *)tag);
|
|
|
|
return (1);
|
|
}
|
|
#endif
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ----- End UMAC Section ----------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|
|
/* ---------------------------------------------------------------------- */
|