478 lines
16 KiB
C
478 lines
16 KiB
C
/*
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* FILE: sha2.c
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* AUTHOR: Aaron D. Gifford - http://www.aarongifford.com/
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*
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* Copyright (c) 2000-2001, Aaron D. Gifford
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* All rights reserved.
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*
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* Modified by Jelte Jansen to fit in ldns, and not clash with any
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* system-defined SHA code.
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* Changes:
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* - Renamed (external) functions and constants to fit ldns style
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* - Removed _End and _Data functions
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* - Added ldns_shaX(data, len, digest) convenience functions
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* - Removed prototypes of _Transform functions and made those static
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* Modified by Wouter, and trimmed, to provide SHA512 for getentropy_fallback.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
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*/
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#include "config.h"
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#include <string.h> /* memcpy()/memset() or bcopy()/bzero() */
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#include <assert.h> /* assert() */
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/* do we have sha512 header defs */
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#ifndef SHA512_DIGEST_LENGTH
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#define SHA512_BLOCK_LENGTH 128
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#define SHA512_DIGEST_LENGTH 64
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#define SHA512_DIGEST_STRING_LENGTH (SHA512_DIGEST_LENGTH * 2 + 1)
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typedef struct _SHA512_CTX {
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uint64_t state[8];
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uint64_t bitcount[2];
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uint8_t buffer[SHA512_BLOCK_LENGTH];
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} SHA512_CTX;
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#endif /* do we have sha512 header defs */
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void SHA512_Init(SHA512_CTX*);
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void SHA512_Update(SHA512_CTX*, void*, size_t);
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void SHA512_Final(uint8_t[SHA512_DIGEST_LENGTH], SHA512_CTX*);
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unsigned char *SHA512(void *data, unsigned int data_len, unsigned char *digest);
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/*** SHA-256/384/512 Machine Architecture Definitions *****************/
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/*
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* BYTE_ORDER NOTE:
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*
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* Please make sure that your system defines BYTE_ORDER. If your
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* architecture is little-endian, make sure it also defines
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* LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
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* equivalent.
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*
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* If your system does not define the above, then you can do so by
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* hand like this:
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*
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* #define LITTLE_ENDIAN 1234
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* #define BIG_ENDIAN 4321
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*
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* And for little-endian machines, add:
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*
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* #define BYTE_ORDER LITTLE_ENDIAN
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*
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* Or for big-endian machines:
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*
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* #define BYTE_ORDER BIG_ENDIAN
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*
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* The FreeBSD machine this was written on defines BYTE_ORDER
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* appropriately by including <sys/types.h> (which in turn includes
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* <machine/endian.h> where the appropriate definitions are actually
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* made).
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*/
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#if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
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#error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
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#endif
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typedef uint8_t sha2_byte; /* Exactly 1 byte */
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typedef uint32_t sha2_word32; /* Exactly 4 bytes */
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#ifdef S_SPLINT_S
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typedef unsigned long long sha2_word64; /* lint 8 bytes */
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#else
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typedef uint64_t sha2_word64; /* Exactly 8 bytes */
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#endif
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/*** SHA-256/384/512 Various Length Definitions ***********************/
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#define SHA512_SHORT_BLOCK_LENGTH (SHA512_BLOCK_LENGTH - 16)
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/*** ENDIAN REVERSAL MACROS *******************************************/
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define REVERSE32(w,x) { \
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sha2_word32 tmp = (w); \
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tmp = (tmp >> 16) | (tmp << 16); \
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(x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
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}
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#ifndef S_SPLINT_S
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#define REVERSE64(w,x) { \
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sha2_word64 tmp = (w); \
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tmp = (tmp >> 32) | (tmp << 32); \
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tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | \
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((tmp & 0x00ff00ff00ff00ffULL) << 8); \
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(x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
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((tmp & 0x0000ffff0000ffffULL) << 16); \
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}
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#else /* splint */
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#define REVERSE64(w,x) /* splint */
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#endif /* splint */
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#endif /* BYTE_ORDER == LITTLE_ENDIAN */
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/*
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* Macro for incrementally adding the unsigned 64-bit integer n to the
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* unsigned 128-bit integer (represented using a two-element array of
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* 64-bit words):
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*/
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#define ADDINC128(w,n) { \
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(w)[0] += (sha2_word64)(n); \
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if ((w)[0] < (n)) { \
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(w)[1]++; \
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} \
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}
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#ifdef S_SPLINT_S
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#undef ADDINC128
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#define ADDINC128(w,n) /* splint */
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#endif
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/*
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* Macros for copying blocks of memory and for zeroing out ranges
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* of memory. Using these macros makes it easy to switch from
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* using memset()/memcpy() and using bzero()/bcopy().
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*
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* Please define either SHA2_USE_MEMSET_MEMCPY or define
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* SHA2_USE_BZERO_BCOPY depending on which function set you
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* choose to use:
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*/
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#if !defined(SHA2_USE_MEMSET_MEMCPY) && !defined(SHA2_USE_BZERO_BCOPY)
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/* Default to memset()/memcpy() if no option is specified */
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#define SHA2_USE_MEMSET_MEMCPY 1
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#endif
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#if defined(SHA2_USE_MEMSET_MEMCPY) && defined(SHA2_USE_BZERO_BCOPY)
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/* Abort with an error if BOTH options are defined */
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#error Define either SHA2_USE_MEMSET_MEMCPY or SHA2_USE_BZERO_BCOPY, not both!
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#endif
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#ifdef SHA2_USE_MEMSET_MEMCPY
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#define MEMSET_BZERO(p,l) memset((p), 0, (l))
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#define MEMCPY_BCOPY(d,s,l) memcpy((d), (s), (l))
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#endif
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#ifdef SHA2_USE_BZERO_BCOPY
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#define MEMSET_BZERO(p,l) bzero((p), (l))
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#define MEMCPY_BCOPY(d,s,l) bcopy((s), (d), (l))
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#endif
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/*** THE SIX LOGICAL FUNCTIONS ****************************************/
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/*
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* Bit shifting and rotation (used by the six SHA-XYZ logical functions:
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*
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* NOTE: The naming of R and S appears backwards here (R is a SHIFT and
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* S is a ROTATION) because the SHA-256/384/512 description document
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* (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
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* same "backwards" definition.
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*/
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/* Shift-right (used in SHA-256, SHA-384, and SHA-512): */
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#define R(b,x) ((x) >> (b))
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/* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
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#define S64(b,x) (((x) >> (b)) | ((x) << (64 - (b))))
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/* Two of six logical functions used in SHA-256, SHA-384, and SHA-512: */
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#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
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#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
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/* Four of six logical functions used in SHA-384 and SHA-512: */
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#define Sigma0_512(x) (S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
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#define Sigma1_512(x) (S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
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#define sigma0_512(x) (S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7, (x)))
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#define sigma1_512(x) (S64(19, (x)) ^ S64(61, (x)) ^ R( 6, (x)))
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/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
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/* Hash constant words K for SHA-384 and SHA-512: */
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static const sha2_word64 K512[80] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
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0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
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0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
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0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
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0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
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0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
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0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
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0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
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0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
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0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
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0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
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0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
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0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
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0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
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0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
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0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
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0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
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0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
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0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
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0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
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0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
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0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
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0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
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0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
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0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
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0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
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0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
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0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
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0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
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0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
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0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
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0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
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0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
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0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
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0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
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0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
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0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
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0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
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0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
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};
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/* initial hash value H for SHA-512 */
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static const sha2_word64 sha512_initial_hash_value[8] = {
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0x6a09e667f3bcc908ULL,
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0xbb67ae8584caa73bULL,
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0x3c6ef372fe94f82bULL,
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0xa54ff53a5f1d36f1ULL,
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0x510e527fade682d1ULL,
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0x9b05688c2b3e6c1fULL,
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0x1f83d9abfb41bd6bULL,
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0x5be0cd19137e2179ULL
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};
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typedef union _ldns_sha2_buffer_union {
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uint8_t* theChars;
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uint64_t* theLongs;
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} ldns_sha2_buffer_union;
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/*** SHA-512: *********************************************************/
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void SHA512_Init(SHA512_CTX* context) {
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if (context == (SHA512_CTX*)0) {
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return;
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}
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MEMCPY_BCOPY(context->state, sha512_initial_hash_value, SHA512_DIGEST_LENGTH);
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MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH);
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context->bitcount[0] = context->bitcount[1] = 0;
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}
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static void SHA512_Transform(SHA512_CTX* context,
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const sha2_word64* data) {
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sha2_word64 a, b, c, d, e, f, g, h, s0, s1;
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sha2_word64 T1, T2, *W512 = (sha2_word64*)context->buffer;
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int j;
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/* initialize registers with the prev. intermediate value */
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a = context->state[0];
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b = context->state[1];
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c = context->state[2];
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d = context->state[3];
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e = context->state[4];
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f = context->state[5];
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g = context->state[6];
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h = context->state[7];
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j = 0;
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do {
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#if BYTE_ORDER == LITTLE_ENDIAN
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/* Convert TO host byte order */
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REVERSE64(*data++, W512[j]);
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/* Apply the SHA-512 compression function to update a..h */
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T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
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#else /* BYTE_ORDER == LITTLE_ENDIAN */
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/* Apply the SHA-512 compression function to update a..h with copy */
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T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + (W512[j] = *data++);
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#endif /* BYTE_ORDER == LITTLE_ENDIAN */
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T2 = Sigma0_512(a) + Maj(a, b, c);
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h = g;
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g = f;
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f = e;
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e = d + T1;
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d = c;
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c = b;
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b = a;
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a = T1 + T2;
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j++;
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} while (j < 16);
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do {
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/* Part of the message block expansion: */
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s0 = W512[(j+1)&0x0f];
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s0 = sigma0_512(s0);
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s1 = W512[(j+14)&0x0f];
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s1 = sigma1_512(s1);
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/* Apply the SHA-512 compression function to update a..h */
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T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
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(W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
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T2 = Sigma0_512(a) + Maj(a, b, c);
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h = g;
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g = f;
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f = e;
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e = d + T1;
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d = c;
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c = b;
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b = a;
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a = T1 + T2;
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j++;
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} while (j < 80);
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/* Compute the current intermediate hash value */
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context->state[0] += a;
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context->state[1] += b;
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context->state[2] += c;
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context->state[3] += d;
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context->state[4] += e;
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context->state[5] += f;
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context->state[6] += g;
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context->state[7] += h;
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/* Clean up */
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a = b = c = d = e = f = g = h = T1 = T2 = 0;
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}
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void SHA512_Update(SHA512_CTX* context, void *datain, size_t len) {
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size_t freespace, usedspace;
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const sha2_byte* data = (const sha2_byte*)datain;
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if (len == 0) {
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/* Calling with no data is valid - we do nothing */
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return;
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}
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/* Sanity check: */
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assert(context != (SHA512_CTX*)0 && data != (sha2_byte*)0);
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usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
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if (usedspace > 0) {
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/* Calculate how much free space is available in the buffer */
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freespace = SHA512_BLOCK_LENGTH - usedspace;
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if (len >= freespace) {
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/* Fill the buffer completely and process it */
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MEMCPY_BCOPY(&context->buffer[usedspace], data, freespace);
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ADDINC128(context->bitcount, freespace << 3);
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len -= freespace;
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data += freespace;
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SHA512_Transform(context, (sha2_word64*)context->buffer);
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} else {
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/* The buffer is not yet full */
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MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
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ADDINC128(context->bitcount, len << 3);
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/* Clean up: */
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usedspace = freespace = 0;
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return;
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}
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}
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while (len >= SHA512_BLOCK_LENGTH) {
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/* Process as many complete blocks as we can */
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SHA512_Transform(context, (sha2_word64*)data);
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ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
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len -= SHA512_BLOCK_LENGTH;
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data += SHA512_BLOCK_LENGTH;
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}
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if (len > 0) {
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/* There's left-overs, so save 'em */
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MEMCPY_BCOPY(context->buffer, data, len);
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ADDINC128(context->bitcount, len << 3);
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}
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/* Clean up: */
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usedspace = freespace = 0;
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}
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static void SHA512_Last(SHA512_CTX* context) {
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size_t usedspace;
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ldns_sha2_buffer_union cast_var;
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usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
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#if BYTE_ORDER == LITTLE_ENDIAN
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/* Convert FROM host byte order */
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REVERSE64(context->bitcount[0],context->bitcount[0]);
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REVERSE64(context->bitcount[1],context->bitcount[1]);
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#endif
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if (usedspace > 0) {
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/* Begin padding with a 1 bit: */
|
|
context->buffer[usedspace++] = 0x80;
|
|
|
|
if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
|
|
/* Set-up for the last transform: */
|
|
MEMSET_BZERO(&context->buffer[usedspace], SHA512_SHORT_BLOCK_LENGTH - usedspace);
|
|
} else {
|
|
if (usedspace < SHA512_BLOCK_LENGTH) {
|
|
MEMSET_BZERO(&context->buffer[usedspace], SHA512_BLOCK_LENGTH - usedspace);
|
|
}
|
|
/* Do second-to-last transform: */
|
|
SHA512_Transform(context, (sha2_word64*)context->buffer);
|
|
|
|
/* And set-up for the last transform: */
|
|
MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH - 2);
|
|
}
|
|
} else {
|
|
/* Prepare for final transform: */
|
|
MEMSET_BZERO(context->buffer, SHA512_SHORT_BLOCK_LENGTH);
|
|
|
|
/* Begin padding with a 1 bit: */
|
|
*context->buffer = 0x80;
|
|
}
|
|
/* Store the length of input data (in bits): */
|
|
cast_var.theChars = context->buffer;
|
|
cast_var.theLongs[SHA512_SHORT_BLOCK_LENGTH / 8] = context->bitcount[1];
|
|
cast_var.theLongs[SHA512_SHORT_BLOCK_LENGTH / 8 + 1] = context->bitcount[0];
|
|
|
|
/* final transform: */
|
|
SHA512_Transform(context, (sha2_word64*)context->buffer);
|
|
}
|
|
|
|
void SHA512_Final(sha2_byte digest[], SHA512_CTX* context) {
|
|
sha2_word64 *d = (sha2_word64*)digest;
|
|
|
|
/* Sanity check: */
|
|
assert(context != (SHA512_CTX*)0);
|
|
|
|
/* If no digest buffer is passed, we don't bother doing this: */
|
|
if (digest != (sha2_byte*)0) {
|
|
SHA512_Last(context);
|
|
|
|
/* Save the hash data for output: */
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
{
|
|
/* Convert TO host byte order */
|
|
int j;
|
|
for (j = 0; j < 8; j++) {
|
|
REVERSE64(context->state[j],context->state[j]);
|
|
*d++ = context->state[j];
|
|
}
|
|
}
|
|
#else
|
|
MEMCPY_BCOPY(d, context->state, SHA512_DIGEST_LENGTH);
|
|
#endif
|
|
}
|
|
|
|
/* Zero out state data */
|
|
MEMSET_BZERO(context, sizeof(SHA512_CTX));
|
|
}
|
|
|
|
unsigned char *
|
|
SHA512(void *data, unsigned int data_len, unsigned char *digest)
|
|
{
|
|
SHA512_CTX ctx;
|
|
SHA512_Init(&ctx);
|
|
SHA512_Update(&ctx, data, data_len);
|
|
SHA512_Final(digest, &ctx);
|
|
return digest;
|
|
}
|