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freebsd-dev/crypto/openssh/umac.c
Dag-Erling Smørgrav d4af9e693f Upgrade to OpenSSH 5.1p1. 
I have worked hard to reduce diffs against the vendor branch.  One
notable change in that respect is that we no longer prefer DSA over
RSA - the reasons for doing so went away years ago.  This may cause
some surprises, as ssh will warn about unknown host keys even for
hosts whose keys haven't changed.

MFC after:	6 weeks
2008-08-01 02:48:36 +00:00

1278 lines
45 KiB
C
Raw Blame History

/* $OpenBSD: umac.c,v 1.3 2008/05/12 20:52:20 pvalchev Exp $ */
/* -----------------------------------------------------------------------
*
* umac.c -- C Implementation UMAC Message Authentication
*
* Version 0.93b of rfc4418.txt -- 2006 July 18
*
* For a full description of UMAC message authentication see the UMAC
* world-wide-web page at http://www.cs.ucdavis.edu/~rogaway/umac
* Please report bugs and suggestions to the UMAC webpage.
*
* Copyright (c) 1999-2006 Ted Krovetz
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and with or without fee, is hereby
* granted provided that the above copyright notice appears in all copies
* and in supporting documentation, and that the name of the copyright
* holder not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior permission.
*
* Comments should be directed to Ted Krovetz (tdk@acm.org)
*
* ---------------------------------------------------------------------- */
/* ////////////////////// IMPORTANT NOTES /////////////////////////////////
*
* 1) This version does not work properly on messages larger than 16MB
*
* 2) If you set the switch to use SSE2, then all data must be 16-byte
* aligned
*
* 3) When calling the function umac(), it is assumed that msg is in
* a writable buffer of length divisible by 32 bytes. The message itself
* does not have to fill the entire buffer, but bytes beyond msg may be
* zeroed.
*
* 4) Three free AES implementations are supported by this implementation of
* UMAC. Paulo Barreto's version is in the public domain and can be found
* at http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ (search for
* "Barreto"). The only two files needed are rijndael-alg-fst.c and
* rijndael-alg-fst.h. Brian Gladman's version is distributed with the GNU
* Public lisence at http://fp.gladman.plus.com/AES/index.htm. It
* includes a fast IA-32 assembly version. The OpenSSL crypo library is
* the third.
*
* 5) With FORCE_C_ONLY flags set to 0, incorrect results are sometimes
* produced under gcc with optimizations set -O3 or higher. Dunno why.
*
/////////////////////////////////////////////////////////////////////// */
/* ---------------------------------------------------------------------- */
/* --- User Switches ---------------------------------------------------- */
/* ---------------------------------------------------------------------- */
#define UMAC_OUTPUT_LEN 8 /* Alowable: 4, 8, 12, 16 */
/* #define FORCE_C_ONLY 1 ANSI C and 64-bit integers req'd */
/* #define AES_IMPLEMENTAION 1 1 = OpenSSL, 2 = Barreto, 3 = Gladman */
/* #define SSE2 0 Is SSE2 is available? */
/* #define RUN_TESTS 0 Run basic correctness/speed tests */
/* #define UMAC_AE_SUPPORT 0 Enable auhthenticated encrytion */
/* ---------------------------------------------------------------------- */
/* -- Global Includes --------------------------------------------------- */
/* ---------------------------------------------------------------------- */
#include "includes.h"
#include <sys/types.h>
#include "xmalloc.h"
#include "umac.h"
#include <string.h>
#include <stdlib.h>
#include <stddef.h>
/* ---------------------------------------------------------------------- */
/* --- Primitive Data Types --- */
/* ---------------------------------------------------------------------- */
/* The following assumptions may need change on your system */
typedef u_int8_t UINT8; /* 1 byte */
typedef u_int16_t UINT16; /* 2 byte */
typedef u_int32_t UINT32; /* 4 byte */
typedef u_int64_t UINT64; /* 8 bytes */
typedef unsigned int UWORD; /* Register */
/* ---------------------------------------------------------------------- */
/* --- Constants -------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
#define UMAC_KEY_LEN 16 /* UMAC takes 16 bytes of external key */
/* Message "words" are read from memory in an endian-specific manner. */
/* For this implementation to behave correctly, __LITTLE_ENDIAN__ must */
/* be set true if the host computer is little-endian. */
#if BYTE_ORDER == LITTLE_ENDIAN
#define __LITTLE_ENDIAN__ 1
#else
#define __LITTLE_ENDIAN__ 0
#endif
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ----- Architecture Specific ------------------------------------------ */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ----- Primitive Routines --------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* --- 32-bit by 32-bit to 64-bit Multiplication ------------------------ */
/* ---------------------------------------------------------------------- */
#define MUL64(a,b) ((UINT64)((UINT64)(UINT32)(a) * (UINT64)(UINT32)(b)))
/* ---------------------------------------------------------------------- */
/* --- Endian Conversion --- Forcing assembly on some platforms */
/* ---------------------------------------------------------------------- */
#if HAVE_SWAP32
#define LOAD_UINT32_REVERSED(p) (swap32(*(UINT32 *)(p)))
#define STORE_UINT32_REVERSED(p,v) (*(UINT32 *)(p) = swap32(v))
#else /* HAVE_SWAP32 */
static UINT32 LOAD_UINT32_REVERSED(void *ptr)
{
UINT32 temp = *(UINT32 *)ptr;
temp = (temp >> 24) | ((temp & 0x00FF0000) >> 8 )
| ((temp & 0x0000FF00) << 8 ) | (temp << 24);
return (UINT32)temp;
}
# if (__LITTLE_ENDIAN__)
static void STORE_UINT32_REVERSED(void *ptr, UINT32 x)
{
UINT32 i = (UINT32)x;
*(UINT32 *)ptr = (i >> 24) | ((i & 0x00FF0000) >> 8 )
| ((i & 0x0000FF00) << 8 ) | (i << 24);
}
# endif /* __LITTLE_ENDIAN */
#endif /* HAVE_SWAP32 */
/* The following definitions use the above reversal-primitives to do the right
* thing on endian specific load and stores.
*/
#if (__LITTLE_ENDIAN__)
#define LOAD_UINT32_LITTLE(ptr) (*(UINT32 *)(ptr))
#define STORE_UINT32_BIG(ptr,x) STORE_UINT32_REVERSED(ptr,x)
#else
#define LOAD_UINT32_LITTLE(ptr) LOAD_UINT32_REVERSED(ptr)
#define STORE_UINT32_BIG(ptr,x) (*(UINT32 *)(ptr) = (UINT32)(x))
#endif
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ----- Begin KDF & PDF Section ---------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* UMAC uses AES with 16 byte block and key lengths */
#define AES_BLOCK_LEN 16
/* OpenSSL's AES */
#include "openbsd-compat/openssl-compat.h"
#ifndef USE_BUILTIN_RIJNDAEL
# include <openssl/aes.h>
#endif
typedef AES_KEY aes_int_key[1];
#define aes_encryption(in,out,int_key) \
AES_encrypt((u_char *)(in),(u_char *)(out),(AES_KEY *)int_key)
#define aes_key_setup(key,int_key) \
AES_set_encrypt_key((u_char *)(key),UMAC_KEY_LEN*8,int_key)
/* The user-supplied UMAC key is stretched using AES in a counter
* mode to supply all random bits needed by UMAC. The kdf function takes
* an AES internal key representation 'key' and writes a stream of
* 'nbytes' bytes to the memory pointed at by 'bufp'. Each distinct
* 'ndx' causes a distinct byte stream.
*/
static void kdf(void *bufp, aes_int_key key, UINT8 ndx, int nbytes)
{
UINT8 in_buf[AES_BLOCK_LEN] = {0};
UINT8 out_buf[AES_BLOCK_LEN];
UINT8 *dst_buf = (UINT8 *)bufp;
int i;
/* Setup the initial value */
in_buf[AES_BLOCK_LEN-9] = ndx;
in_buf[AES_BLOCK_LEN-1] = i = 1;
while (nbytes >= AES_BLOCK_LEN) {
aes_encryption(in_buf, out_buf, key);
memcpy(dst_buf,out_buf,AES_BLOCK_LEN);
in_buf[AES_BLOCK_LEN-1] = ++i;
nbytes -= AES_BLOCK_LEN;
dst_buf += AES_BLOCK_LEN;
}
if (nbytes) {
aes_encryption(in_buf, out_buf, key);
memcpy(dst_buf,out_buf,nbytes);
}
}
/* The final UHASH result is XOR'd with the output of a pseudorandom
* function. Here, we use AES to generate random output and
* xor the appropriate bytes depending on the last bits of nonce.
* This scheme is optimized for sequential, increasing big-endian nonces.
*/
typedef struct {
UINT8 cache[AES_BLOCK_LEN]; /* Previous AES output is saved */
UINT8 nonce[AES_BLOCK_LEN]; /* The AES input making above cache */
aes_int_key prf_key; /* Expanded AES key for PDF */
} pdf_ctx;
static void pdf_init(pdf_ctx *pc, aes_int_key prf_key)
{
UINT8 buf[UMAC_KEY_LEN];
kdf(buf, prf_key, 0, UMAC_KEY_LEN);
aes_key_setup(buf, pc->prf_key);
/* Initialize pdf and cache */
memset(pc->nonce, 0, sizeof(pc->nonce));
aes_encryption(pc->nonce, pc->cache, pc->prf_key);
}
static void pdf_gen_xor(pdf_ctx *pc, UINT8 nonce[8], UINT8 buf[8])
{
/* 'ndx' indicates that we'll be using the 0th or 1st eight bytes
* of the AES output. If last time around we returned the ndx-1st
* element, then we may have the result in the cache already.
*/
#if (UMAC_OUTPUT_LEN == 4)
#define LOW_BIT_MASK 3
#elif (UMAC_OUTPUT_LEN == 8)
#define LOW_BIT_MASK 1
#elif (UMAC_OUTPUT_LEN > 8)
#define LOW_BIT_MASK 0
#endif
UINT8 tmp_nonce_lo[4];
#if LOW_BIT_MASK != 0
int ndx = nonce[7] & LOW_BIT_MASK;
#endif
*(UINT32 *)tmp_nonce_lo = ((UINT32 *)nonce)[1];
tmp_nonce_lo[3] &= ~LOW_BIT_MASK; /* zero last bit */
if ( (((UINT32 *)tmp_nonce_lo)[0] != ((UINT32 *)pc->nonce)[1]) ||
(((UINT32 *)nonce)[0] != ((UINT32 *)pc->nonce)[0]) )
{
((UINT32 *)pc->nonce)[0] = ((UINT32 *)nonce)[0];
((UINT32 *)pc->nonce)[1] = ((UINT32 *)tmp_nonce_lo)[0];
aes_encryption(pc->nonce, pc->cache, pc->prf_key);
}
#if (UMAC_OUTPUT_LEN == 4)
*((UINT32 *)buf) ^= ((UINT32 *)pc->cache)[ndx];
#elif (UMAC_OUTPUT_LEN == 8)
*((UINT64 *)buf) ^= ((UINT64 *)pc->cache)[ndx];
#elif (UMAC_OUTPUT_LEN == 12)
((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0];
((UINT32 *)buf)[2] ^= ((UINT32 *)pc->cache)[2];
#elif (UMAC_OUTPUT_LEN == 16)
((UINT64 *)buf)[0] ^= ((UINT64 *)pc->cache)[0];
((UINT64 *)buf)[1] ^= ((UINT64 *)pc->cache)[1];
#endif
}
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ----- Begin NH Hash Section ------------------------------------------ */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* The NH-based hash functions used in UMAC are described in the UMAC paper
* and specification, both of which can be found at the UMAC website.
* The interface to this implementation has two
* versions, one expects the entire message being hashed to be passed
* in a single buffer and returns the hash result immediately. The second
* allows the message to be passed in a sequence of buffers. In the
* muliple-buffer interface, the client calls the routine nh_update() as
* many times as necessary. When there is no more data to be fed to the
* hash, the client calls nh_final() which calculates the hash output.
* Before beginning another hash calculation the nh_reset() routine
* must be called. The single-buffer routine, nh(), is equivalent to
* the sequence of calls nh_update() and nh_final(); however it is
* optimized and should be prefered whenever the multiple-buffer interface
* is not necessary. When using either interface, it is the client's
* responsability to pass no more than L1_KEY_LEN bytes per hash result.
*
* The routine nh_init() initializes the nh_ctx data structure and
* must be called once, before any other PDF routine.
*/
/* The "nh_aux" routines do the actual NH hashing work. They
* expect buffers to be multiples of L1_PAD_BOUNDARY. These routines
* produce output for all STREAMS NH iterations in one call,
* allowing the parallel implementation of the streams.
*/
#define STREAMS (UMAC_OUTPUT_LEN / 4) /* Number of times hash is applied */
#define L1_KEY_LEN 1024 /* Internal key bytes */
#define L1_KEY_SHIFT 16 /* Toeplitz key shift between streams */
#define L1_PAD_BOUNDARY 32 /* pad message to boundary multiple */
#define ALLOC_BOUNDARY 16 /* Keep buffers aligned to this */
#define HASH_BUF_BYTES 64 /* nh_aux_hb buffer multiple */
typedef struct {
UINT8 nh_key [L1_KEY_LEN + L1_KEY_SHIFT * (STREAMS - 1)]; /* NH Key */
UINT8 data [HASH_BUF_BYTES]; /* Incomming data buffer */
int next_data_empty; /* Bookeeping variable for data buffer. */
int bytes_hashed; /* Bytes (out of L1_KEY_LEN) incorperated. */
UINT64 state[STREAMS]; /* on-line state */
} nh_ctx;
#if (UMAC_OUTPUT_LEN == 4)
static void nh_aux(void *kp, void *dp, void *hp, UINT32 dlen)
/* NH hashing primitive. Previous (partial) hash result is loaded and
* then stored via hp pointer. The length of the data pointed at by "dp",
* "dlen", is guaranteed to be divisible by L1_PAD_BOUNDARY (32). Key
* is expected to be endian compensated in memory at key setup.
*/
{
UINT64 h;
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;
h = *((UINT64 *)hp);
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);
k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
h += MUL64((k0 + d0), (k4 + d4));
h += MUL64((k1 + d1), (k5 + d5));
h += MUL64((k2 + d2), (k6 + d6));
h += MUL64((k3 + d3), (k7 + d7));
d += 8;
k += 8;
} while (--c);
*((UINT64 *)hp) = h;
}
#elif (UMAC_OUTPUT_LEN == 8)
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 16 bytes of hash-state per call.
*/
{
UINT64 h1,h2;
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;
h1 = *((UINT64 *)hp);
h2 = *((UINT64 *)hp + 1);
k0 = *(k+0); k1 = *(k+1); k2 = *(k+2); k3 = *(k+3);
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);
k4 = *(k+4); k5 = *(k+5); k6 = *(k+6); k7 = *(k+7);
k8 = *(k+8); k9 = *(k+9); k10 = *(k+10); k11 = *(k+11);
h1 += MUL64((k0 + d0), (k4 + d4));
h2 += MUL64((k4 + d0), (k8 + d4));
h1 += MUL64((k1 + d1), (k5 + d5));
h2 += MUL64((k5 + d1), (k9 + d5));
h1 += MUL64((k2 + d2), (k6 + d6));
h2 += MUL64((k6 + d2), (k10 + d6));
h1 += MUL64((k3 + d3), (k7 + d7));
h2 += MUL64((k7 + d3), (k11 + d7));
k0 = k8; k1 = k9; k2 = k10; k3 = k11;
d += 8;
k += 8;
} while (--c);
((UINT64 *)hp)[0] = h1;
((UINT64 *)hp)[1] = h2;
}
#elif (UMAC_OUTPUT_LEN == 12)
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;
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;
h1 = *((UINT64 *)hp);
h2 = *((UINT64 *)hp + 1);
h3 = *((UINT64 *)hp + 2);
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);
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)];
/* Zero the entire uhash context */
memset(ahc, 0, sizeof(uhash_ctx));
/* Initialize the L1 hash */
nh_init(&ahc->hash, prf_key);
/* Setup L2 hash variables */
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 ----------------------------------------------- */
/* ---------------------------------------------------------------------- */
/* ---------------------------------------------------------------------- */
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