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compat_sha2.c
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compat_sha2.c
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/* $OpenBSD$ */
/*
* FILE: sha2.c
* AUTHOR: Aaron D. Gifford <[email protected]>
*
* Copyright (c) 2000-2001, Aaron D. Gifford
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTOR(S) ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTOR(S) BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $From: sha2.c,v 1.1 2001/11/08 00:01:51 adg Exp adg $
*/
/* OPENBSD ORIGINAL: lib/libc/hash/sha2.c */
/* no-op out, similar to DEF_WEAK but only needed here */
#define MAKE_CLONE(x, y) void __ssh_compat_make_clone_##x_##y(void)
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#ifndef MINIMUM
# define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef BYTE_ORDER
# if defined(LITTLE_ENDIAN) || defined(BIG_ENDIAN)
# error Confusion in endian macros.
# endif
# if !defined(__BYTE_ORDER__)
# error Byte order macro not found.
# endif
# if !defined(__ORDER_LITTLE_ENDIAN__) || !defined(__ORDER_BIG_ENDIAN__)
# error Little/big endian macros not found.
# endif
# define BYTE_ORDER __BYTE_ORDER__
# define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
# define BIG_ENDIAN __ORDER_BIG_ENDIAN__
#endif /*!BYTE_ORDER*/
/*
* UNROLLED TRANSFORM LOOP NOTE:
* You can define SHA2_UNROLL_TRANSFORM to use the unrolled transform
* loop version for the hash transform rounds (defined using macros
* later in this file). Either define on the command line, for example:
*
* cc -DSHA2_UNROLL_TRANSFORM -o sha2 sha2.c sha2prog.c
*
* or define below:
*
* #define SHA2_UNROLL_TRANSFORM
*
*/
#if defined(__amd64__) || defined(__i386__)
#define SHA2_UNROLL_TRANSFORM
#endif
/*** SHA-224/256/384/512 Machine Architecture Definitions *****************/
/*
* BYTE_ORDER NOTE:
*
* Please make sure that your system defines BYTE_ORDER. If your
* architecture is little-endian, make sure it also defines
* LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
* equivalent.
*
* If your system does not define the above, then you can do so by
* hand like this:
*
* #define LITTLE_ENDIAN 1234
* #define BIG_ENDIAN 4321
*
* And for little-endian machines, add:
*
* #define BYTE_ORDER LITTLE_ENDIAN
*
* Or for big-endian machines:
*
* #define BYTE_ORDER BIG_ENDIAN
*
* The FreeBSD machine this was written on defines BYTE_ORDER
* appropriately by including <sys/types.h> (which in turn includes
* <machine/endian.h> where the appropriate definitions are actually
* made).
*/
#if !defined(BYTE_ORDER) || (BYTE_ORDER != LITTLE_ENDIAN && BYTE_ORDER != BIG_ENDIAN)
#error Define BYTE_ORDER to be equal to either LITTLE_ENDIAN or BIG_ENDIAN
#endif
/*** SHA-224/256/384/512 Various Length Definitions ***********************/
/* NOTE: Most of these are in sha2.h */
#define SHA224_SHORT_BLOCK_LENGTH (SHA224_BLOCK_LENGTH - 8)
#define SHA256_SHORT_BLOCK_LENGTH (SHA256_BLOCK_LENGTH - 8)
#define SHA384_SHORT_BLOCK_LENGTH (SHA384_BLOCK_LENGTH - 16)
#define SHA512_SHORT_BLOCK_LENGTH (SHA512_BLOCK_LENGTH - 16)
/*** ENDIAN SPECIFIC COPY MACROS **************************************/
#define BE_8_TO_32(dst, cp) do { \
(dst) = (uint32_t)(cp)[3] | ((uint32_t)(cp)[2] << 8) | \
((uint32_t)(cp)[1] << 16) | ((uint32_t)(cp)[0] << 24); \
} while(0)
#define BE_8_TO_64(dst, cp) do { \
(dst) = (uint64_t)(cp)[7] | ((uint64_t)(cp)[6] << 8) | \
((uint64_t)(cp)[5] << 16) | ((uint64_t)(cp)[4] << 24) | \
((uint64_t)(cp)[3] << 32) | ((uint64_t)(cp)[2] << 40) | \
((uint64_t)(cp)[1] << 48) | ((uint64_t)(cp)[0] << 56); \
} while (0)
#define BE_64_TO_8(cp, src) do { \
(cp)[0] = (src) >> 56; \
(cp)[1] = (src) >> 48; \
(cp)[2] = (src) >> 40; \
(cp)[3] = (src) >> 32; \
(cp)[4] = (src) >> 24; \
(cp)[5] = (src) >> 16; \
(cp)[6] = (src) >> 8; \
(cp)[7] = (src); \
} while (0)
#define BE_32_TO_8(cp, src) do { \
(cp)[0] = (src) >> 24; \
(cp)[1] = (src) >> 16; \
(cp)[2] = (src) >> 8; \
(cp)[3] = (src); \
} while (0)
/*
* Macro for incrementally adding the unsigned 64-bit integer n to the
* unsigned 128-bit integer (represented using a two-element array of
* 64-bit words):
*/
#define ADDINC128(w,n) do { \
(w)[0] += (uint64_t)(n); \
if ((w)[0] < (n)) { \
(w)[1]++; \
} \
} while (0)
/*** THE SIX LOGICAL FUNCTIONS ****************************************/
/*
* Bit shifting and rotation (used by the six SHA-XYZ logical functions:
*
* NOTE: The naming of R and S appears backwards here (R is a SHIFT and
* S is a ROTATION) because the SHA-224/256/384/512 description document
* (see http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf) uses this
* same "backwards" definition.
*/
/* Shift-right (used in SHA-224, SHA-256, SHA-384, and SHA-512): */
#define R(b,x) ((x) >> (b))
/* 32-bit Rotate-right (used in SHA-224 and SHA-256): */
#define S32(b,x) (((x) >> (b)) | ((x) << (32 - (b))))
/* 64-bit Rotate-right (used in SHA-384 and SHA-512): */
#define S64(b,x) (((x) >> (b)) | ((x) << (64 - (b))))
/* Two of six logical functions used in SHA-224, SHA-256, SHA-384, and SHA-512: */
#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
/* Four of six logical functions used in SHA-224 and SHA-256: */
#define Sigma0_256(x) (S32(2, (x)) ^ S32(13, (x)) ^ S32(22, (x)))
#define Sigma1_256(x) (S32(6, (x)) ^ S32(11, (x)) ^ S32(25, (x)))
#define sigma0_256(x) (S32(7, (x)) ^ S32(18, (x)) ^ R(3 , (x)))
#define sigma1_256(x) (S32(17, (x)) ^ S32(19, (x)) ^ R(10, (x)))
/* Four of six logical functions used in SHA-384 and SHA-512: */
#define Sigma0_512(x) (S64(28, (x)) ^ S64(34, (x)) ^ S64(39, (x)))
#define Sigma1_512(x) (S64(14, (x)) ^ S64(18, (x)) ^ S64(41, (x)))
#define sigma0_512(x) (S64( 1, (x)) ^ S64( 8, (x)) ^ R( 7, (x)))
#define sigma1_512(x) (S64(19, (x)) ^ S64(61, (x)) ^ R( 6, (x)))
/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
/* Hash constant words K for SHA-224 and SHA-256: */
static const uint32_t K256[64] = {
0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
};
/* Initial hash value H for SHA-256: */
static const uint32_t sha256_initial_hash_value[8] = {
0x6a09e667UL,
0xbb67ae85UL,
0x3c6ef372UL,
0xa54ff53aUL,
0x510e527fUL,
0x9b05688cUL,
0x1f83d9abUL,
0x5be0cd19UL
};
/* Hash constant words K for SHA-384 and SHA-512: */
static const uint64_t K512[80] = {
0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
};
/* Initial hash value H for SHA-512 */
static const uint64_t sha512_initial_hash_value[8] = {
0x6a09e667f3bcc908ULL,
0xbb67ae8584caa73bULL,
0x3c6ef372fe94f82bULL,
0xa54ff53a5f1d36f1ULL,
0x510e527fade682d1ULL,
0x9b05688c2b3e6c1fULL,
0x1f83d9abfb41bd6bULL,
0x5be0cd19137e2179ULL
};
/* Initial hash value H for SHA-384 */
static const uint64_t sha384_initial_hash_value[8] = {
0xcbbb9d5dc1059ed8ULL,
0x629a292a367cd507ULL,
0x9159015a3070dd17ULL,
0x152fecd8f70e5939ULL,
0x67332667ffc00b31ULL,
0x8eb44a8768581511ULL,
0xdb0c2e0d64f98fa7ULL,
0x47b5481dbefa4fa4ULL
};
/*** SHA-256: *********************************************************/
void
SHA256Init(SHA2_CTX *context)
{
memcpy(context->state.st32, sha256_initial_hash_value,
sizeof(sha256_initial_hash_value));
memset(context->buffer, 0, sizeof(context->buffer));
context->bitcount[0] = 0;
}
#ifdef SHA2_UNROLL_TRANSFORM
/* Unrolled SHA-256 round macros: */
#define ROUND256_0_TO_15(a,b,c,d,e,f,g,h) do { \
BE_8_TO_32(W256[j], data); \
data += 4; \
T1 = (h) + Sigma1_256((e)) + Ch((e), (f), (g)) + K256[j] + W256[j]; \
(d) += T1; \
(h) = T1 + Sigma0_256((a)) + Maj((a), (b), (c)); \
j++; \
} while(0)
#define ROUND256(a,b,c,d,e,f,g,h) do { \
s0 = W256[(j+1)&0x0f]; \
s0 = sigma0_256(s0); \
s1 = W256[(j+14)&0x0f]; \
s1 = sigma1_256(s1); \
T1 = (h) + Sigma1_256((e)) + Ch((e), (f), (g)) + K256[j] + \
(W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0); \
(d) += T1; \
(h) = T1 + Sigma0_256((a)) + Maj((a), (b), (c)); \
j++; \
} while(0)
void
SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
{
uint32_t a, b, c, d, e, f, g, h, s0, s1;
uint32_t T1, W256[16];
int j;
/* Initialize registers with the prev. intermediate value */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
f = state[5];
g = state[6];
h = state[7];
j = 0;
do {
/* Rounds 0 to 15 (unrolled): */
ROUND256_0_TO_15(a,b,c,d,e,f,g,h);
ROUND256_0_TO_15(h,a,b,c,d,e,f,g);
ROUND256_0_TO_15(g,h,a,b,c,d,e,f);
ROUND256_0_TO_15(f,g,h,a,b,c,d,e);
ROUND256_0_TO_15(e,f,g,h,a,b,c,d);
ROUND256_0_TO_15(d,e,f,g,h,a,b,c);
ROUND256_0_TO_15(c,d,e,f,g,h,a,b);
ROUND256_0_TO_15(b,c,d,e,f,g,h,a);
} while (j < 16);
/* Now for the remaining rounds up to 63: */
do {
ROUND256(a,b,c,d,e,f,g,h);
ROUND256(h,a,b,c,d,e,f,g);
ROUND256(g,h,a,b,c,d,e,f);
ROUND256(f,g,h,a,b,c,d,e);
ROUND256(e,f,g,h,a,b,c,d);
ROUND256(d,e,f,g,h,a,b,c);
ROUND256(c,d,e,f,g,h,a,b);
ROUND256(b,c,d,e,f,g,h,a);
} while (j < 64);
/* Compute the current intermediate hash value */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
/* Clean up */
a = b = c = d = e = f = g = h = T1 = 0;
}
#else /* SHA2_UNROLL_TRANSFORM */
void
SHA256Transform(uint32_t state[8], const uint8_t data[SHA256_BLOCK_LENGTH])
{
uint32_t a, b, c, d, e, f, g, h, s0, s1;
uint32_t T1, T2, W256[16];
int j;
/* Initialize registers with the prev. intermediate value */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
f = state[5];
g = state[6];
h = state[7];
j = 0;
do {
BE_8_TO_32(W256[j], data);
data += 4;
/* Apply the SHA-256 compression function to update a..h */
T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] + W256[j];
T2 = Sigma0_256(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
j++;
} while (j < 16);
do {
/* Part of the message block expansion: */
s0 = W256[(j+1)&0x0f];
s0 = sigma0_256(s0);
s1 = W256[(j+14)&0x0f];
s1 = sigma1_256(s1);
/* Apply the SHA-256 compression function to update a..h */
T1 = h + Sigma1_256(e) + Ch(e, f, g) + K256[j] +
(W256[j&0x0f] += s1 + W256[(j+9)&0x0f] + s0);
T2 = Sigma0_256(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
j++;
} while (j < 64);
/* Compute the current intermediate hash value */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
/* Clean up */
a = b = c = d = e = f = g = h = T1 = T2 = 0;
}
#endif /* SHA2_UNROLL_TRANSFORM */
void
SHA256Update(SHA2_CTX *context, const uint8_t *data, size_t len)
{
uint64_t freespace, usedspace;
/* Calling with no data is valid (we do nothing) */
if (len == 0)
return;
usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
if (usedspace > 0) {
/* Calculate how much free space is available in the buffer */
freespace = SHA256_BLOCK_LENGTH - usedspace;
if (len >= freespace) {
/* Fill the buffer completely and process it */
memcpy(&context->buffer[usedspace], data, freespace);
context->bitcount[0] += freespace << 3;
len -= freespace;
data += freespace;
SHA256Transform(context->state.st32, context->buffer);
} else {
/* The buffer is not yet full */
memcpy(&context->buffer[usedspace], data, len);
context->bitcount[0] += (uint64_t)len << 3;
/* Clean up: */
usedspace = freespace = 0;
return;
}
}
while (len >= SHA256_BLOCK_LENGTH) {
/* Process as many complete blocks as we can */
SHA256Transform(context->state.st32, data);
context->bitcount[0] += SHA256_BLOCK_LENGTH << 3;
len -= SHA256_BLOCK_LENGTH;
data += SHA256_BLOCK_LENGTH;
}
if (len > 0) {
/* There's left-overs, so save 'em */
memcpy(context->buffer, data, len);
context->bitcount[0] += len << 3;
}
/* Clean up: */
usedspace = freespace = 0;
}
void
SHA256Pad(SHA2_CTX *context)
{
unsigned int usedspace;
usedspace = (context->bitcount[0] >> 3) % SHA256_BLOCK_LENGTH;
if (usedspace > 0) {
/* Begin padding with a 1 bit: */
context->buffer[usedspace++] = 0x80;
if (usedspace <= SHA256_SHORT_BLOCK_LENGTH) {
/* Set-up for the last transform: */
memset(&context->buffer[usedspace], 0,
SHA256_SHORT_BLOCK_LENGTH - usedspace);
} else {
if (usedspace < SHA256_BLOCK_LENGTH) {
memset(&context->buffer[usedspace], 0,
SHA256_BLOCK_LENGTH - usedspace);
}
/* Do second-to-last transform: */
SHA256Transform(context->state.st32, context->buffer);
/* Prepare for last transform: */
memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
}
} else {
/* Set-up for the last transform: */
memset(context->buffer, 0, SHA256_SHORT_BLOCK_LENGTH);
/* Begin padding with a 1 bit: */
*context->buffer = 0x80;
}
/* Store the length of input data (in bits) in big endian format: */
BE_64_TO_8(&context->buffer[SHA256_SHORT_BLOCK_LENGTH],
context->bitcount[0]);
/* Final transform: */
SHA256Transform(context->state.st32, context->buffer);
/* Clean up: */
usedspace = 0;
}
void
SHA256Final(uint8_t digest[SHA256_DIGEST_LENGTH], SHA2_CTX *context)
{
SHA256Pad(context);
#if BYTE_ORDER == LITTLE_ENDIAN
int i;
/* Convert TO host byte order */
for (i = 0; i < 8; i++)
BE_32_TO_8(digest + i * 4, context->state.st32[i]);
#else
memcpy(digest, context->state.st32, SHA256_DIGEST_LENGTH);
#endif
explicit_bzero(context, sizeof(*context));
}
/*** SHA-512: *********************************************************/
void
SHA512Init(SHA2_CTX *context)
{
memcpy(context->state.st64, sha512_initial_hash_value,
sizeof(sha512_initial_hash_value));
memset(context->buffer, 0, sizeof(context->buffer));
context->bitcount[0] = context->bitcount[1] = 0;
}
#ifdef SHA2_UNROLL_TRANSFORM
/* Unrolled SHA-512 round macros: */
#define ROUND512_0_TO_15(a,b,c,d,e,f,g,h) do { \
BE_8_TO_64(W512[j], data); \
data += 8; \
T1 = (h) + Sigma1_512((e)) + Ch((e), (f), (g)) + K512[j] + W512[j]; \
(d) += T1; \
(h) = T1 + Sigma0_512((a)) + Maj((a), (b), (c)); \
j++; \
} while(0)
#define ROUND512(a,b,c,d,e,f,g,h) do { \
s0 = W512[(j+1)&0x0f]; \
s0 = sigma0_512(s0); \
s1 = W512[(j+14)&0x0f]; \
s1 = sigma1_512(s1); \
T1 = (h) + Sigma1_512((e)) + Ch((e), (f), (g)) + K512[j] + \
(W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0); \
(d) += T1; \
(h) = T1 + Sigma0_512((a)) + Maj((a), (b), (c)); \
j++; \
} while(0)
void
SHA512Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH])
{
uint64_t a, b, c, d, e, f, g, h, s0, s1;
uint64_t T1, W512[16];
int j;
/* Initialize registers with the prev. intermediate value */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
f = state[5];
g = state[6];
h = state[7];
j = 0;
do {
/* Rounds 0 to 15 (unrolled): */
ROUND512_0_TO_15(a,b,c,d,e,f,g,h);
ROUND512_0_TO_15(h,a,b,c,d,e,f,g);
ROUND512_0_TO_15(g,h,a,b,c,d,e,f);
ROUND512_0_TO_15(f,g,h,a,b,c,d,e);
ROUND512_0_TO_15(e,f,g,h,a,b,c,d);
ROUND512_0_TO_15(d,e,f,g,h,a,b,c);
ROUND512_0_TO_15(c,d,e,f,g,h,a,b);
ROUND512_0_TO_15(b,c,d,e,f,g,h,a);
} while (j < 16);
/* Now for the remaining rounds up to 79: */
do {
ROUND512(a,b,c,d,e,f,g,h);
ROUND512(h,a,b,c,d,e,f,g);
ROUND512(g,h,a,b,c,d,e,f);
ROUND512(f,g,h,a,b,c,d,e);
ROUND512(e,f,g,h,a,b,c,d);
ROUND512(d,e,f,g,h,a,b,c);
ROUND512(c,d,e,f,g,h,a,b);
ROUND512(b,c,d,e,f,g,h,a);
} while (j < 80);
/* Compute the current intermediate hash value */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
/* Clean up */
a = b = c = d = e = f = g = h = T1 = 0;
}
#else /* SHA2_UNROLL_TRANSFORM */
void
SHA512Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH])
{
uint64_t a, b, c, d, e, f, g, h, s0, s1;
uint64_t T1, T2, W512[16];
int j;
/* Initialize registers with the prev. intermediate value */
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
f = state[5];
g = state[6];
h = state[7];
j = 0;
do {
BE_8_TO_64(W512[j], data);
data += 8;
/* Apply the SHA-512 compression function to update a..h */
T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] + W512[j];
T2 = Sigma0_512(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
j++;
} while (j < 16);
do {
/* Part of the message block expansion: */
s0 = W512[(j+1)&0x0f];
s0 = sigma0_512(s0);
s1 = W512[(j+14)&0x0f];
s1 = sigma1_512(s1);
/* Apply the SHA-512 compression function to update a..h */
T1 = h + Sigma1_512(e) + Ch(e, f, g) + K512[j] +
(W512[j&0x0f] += s1 + W512[(j+9)&0x0f] + s0);
T2 = Sigma0_512(a) + Maj(a, b, c);
h = g;
g = f;
f = e;
e = d + T1;
d = c;
c = b;
b = a;
a = T1 + T2;
j++;
} while (j < 80);
/* Compute the current intermediate hash value */
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
/* Clean up */
a = b = c = d = e = f = g = h = T1 = T2 = 0;
}
#endif /* SHA2_UNROLL_TRANSFORM */
void
SHA512Update(SHA2_CTX *context, const uint8_t *data, size_t len)
{
size_t freespace, usedspace;
/* Calling with no data is valid (we do nothing) */
if (len == 0)
return;
usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
if (usedspace > 0) {
/* Calculate how much free space is available in the buffer */
freespace = SHA512_BLOCK_LENGTH - usedspace;
if (len >= freespace) {
/* Fill the buffer completely and process it */
memcpy(&context->buffer[usedspace], data, freespace);
ADDINC128(context->bitcount, freespace << 3);
len -= freespace;
data += freespace;
SHA512Transform(context->state.st64, context->buffer);
} else {
/* The buffer is not yet full */
memcpy(&context->buffer[usedspace], data, len);
ADDINC128(context->bitcount, len << 3);
/* Clean up: */
usedspace = freespace = 0;
return;
}
}
while (len >= SHA512_BLOCK_LENGTH) {
/* Process as many complete blocks as we can */
SHA512Transform(context->state.st64, data);
ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
len -= SHA512_BLOCK_LENGTH;
data += SHA512_BLOCK_LENGTH;
}
if (len > 0) {
/* There's left-overs, so save 'em */
memcpy(context->buffer, data, len);
ADDINC128(context->bitcount, len << 3);
}
/* Clean up: */
usedspace = freespace = 0;
}
void
SHA512Pad(SHA2_CTX *context)
{
unsigned int usedspace;
usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
if (usedspace > 0) {
/* Begin padding with a 1 bit: */
context->buffer[usedspace++] = 0x80;
if (usedspace <= SHA512_SHORT_BLOCK_LENGTH) {
/* Set-up for the last transform: */
memset(&context->buffer[usedspace], 0, SHA512_SHORT_BLOCK_LENGTH - usedspace);
} else {
if (usedspace < SHA512_BLOCK_LENGTH) {
memset(&context->buffer[usedspace], 0, SHA512_BLOCK_LENGTH - usedspace);
}
/* Do second-to-last transform: */
SHA512Transform(context->state.st64, context->buffer);
/* And set-up for the last transform: */
memset(context->buffer, 0, SHA512_BLOCK_LENGTH - 2);
}
} else {
/* Prepare for final transform: */
memset(context->buffer, 0, SHA512_SHORT_BLOCK_LENGTH);
/* Begin padding with a 1 bit: */
*context->buffer = 0x80;
}
/* Store the length of input data (in bits) in big endian format: */
BE_64_TO_8(&context->buffer[SHA512_SHORT_BLOCK_LENGTH],
context->bitcount[1]);
BE_64_TO_8(&context->buffer[SHA512_SHORT_BLOCK_LENGTH + 8],
context->bitcount[0]);
/* Final transform: */
SHA512Transform(context->state.st64, context->buffer);
/* Clean up: */
usedspace = 0;
}
void
SHA512Final(uint8_t digest[SHA512_DIGEST_LENGTH], SHA2_CTX *context)
{
SHA512Pad(context);
#if BYTE_ORDER == LITTLE_ENDIAN
int i;
/* Convert TO host byte order */
for (i = 0; i < 8; i++)
BE_64_TO_8(digest + i * 8, context->state.st64[i]);
#else
memcpy(digest, context->state.st64, SHA512_DIGEST_LENGTH);
#endif
explicit_bzero(context, sizeof(*context));
}
/*** SHA-384: *********************************************************/
void
SHA384Init(SHA2_CTX *context)
{
memcpy(context->state.st64, sha384_initial_hash_value,
sizeof(sha384_initial_hash_value));
memset(context->buffer, 0, sizeof(context->buffer));
context->bitcount[0] = context->bitcount[1] = 0;
}
MAKE_CLONE(SHA384Transform, SHA512Transform);
MAKE_CLONE(SHA384Update, SHA512Update);
MAKE_CLONE(SHA384Pad, SHA512Pad);
/* Equivalent of MAKE_CLONE (which is a no-op) for SHA384 funcs */
void
SHA384Transform(uint64_t state[8], const uint8_t data[SHA512_BLOCK_LENGTH])
{
SHA512Transform(state, data);
}
void
SHA384Update(SHA2_CTX *context, const uint8_t *data, size_t len)
{
SHA512Update(context, data, len);
}
void
SHA384Pad(SHA2_CTX *context)
{
SHA512Pad(context);
}
void
SHA384Final(uint8_t digest[SHA384_DIGEST_LENGTH], SHA2_CTX *context)
{
SHA384Pad(context);
#if BYTE_ORDER == LITTLE_ENDIAN
int i;
/* Convert TO host byte order */
for (i = 0; i < 6; i++)
BE_64_TO_8(digest + i * 8, context->state.st64[i]);
#else
memcpy(digest, context->state.st64, SHA384_DIGEST_LENGTH);
#endif
/* Zero out state data */
explicit_bzero(context, sizeof(*context));
}
char *
SHA256End(SHA2_CTX *ctx, char *buf)
{
int i;
uint8_t digest[SHA256_DIGEST_LENGTH];
static const char hex[] = "0123456789abcdef";
if (buf == NULL && (buf = malloc(SHA256_DIGEST_STRING_LENGTH)) == NULL)
return (NULL);
SHA256Final(digest, ctx);
for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
buf[i + i] = hex[digest[i] >> 4];
buf[i + i + 1] = hex[digest[i] & 0x0f];
}
buf[i + i] = '\0';
explicit_bzero(digest, sizeof(digest));
return (buf);
}
char *
SHA384End(SHA2_CTX *ctx, char *buf)
{
int i;
uint8_t digest[SHA384_DIGEST_LENGTH];
static const char hex[] = "0123456789abcdef";
if (buf == NULL && (buf = malloc(SHA384_DIGEST_STRING_LENGTH)) == NULL)
return (NULL);
SHA384Final(digest, ctx);
for (i = 0; i < SHA384_DIGEST_LENGTH; i++) {
buf[i + i] = hex[digest[i] >> 4];
buf[i + i + 1] = hex[digest[i] & 0x0f];
}
buf[i + i] = '\0';
explicit_bzero(digest, sizeof(digest));
return (buf);
}
char *
SHA512End(SHA2_CTX *ctx, char *buf)
{
int i;
uint8_t digest[SHA512_DIGEST_LENGTH];
static const char hex[] = "0123456789abcdef";
if (buf == NULL && (buf = malloc(SHA512_DIGEST_STRING_LENGTH)) == NULL)
return (NULL);
SHA512Final(digest, ctx);
for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
buf[i + i] = hex[digest[i] >> 4];
buf[i + i + 1] = hex[digest[i] & 0x0f];
}
buf[i + i] = '\0';
explicit_bzero(digest, sizeof(digest));
return (buf);
}
char *
SHA256FileChunk(const char *filename, char *buf, off_t off, off_t len)
{
struct stat sb;
u_char buffer[BUFSIZ];
SHA2_CTX ctx;
int fd, save_errno;
ssize_t nr;
SHA256Init(&ctx);
if ((fd = open(filename, O_RDONLY)) == -1)
return (NULL);
if (len == 0) {
if (fstat(fd, &sb) == -1) {
save_errno = errno;
close(fd);
errno = save_errno;
return (NULL);
}
len = sb.st_size;
}
if (off > 0 && lseek(fd, off, SEEK_SET) == -1) {
save_errno = errno;
close(fd);
errno = save_errno;
return (NULL);
}
while ((nr = read(fd, buffer, MINIMUM(sizeof(buffer), (size_t)len))) > 0) {
SHA256Update(&ctx, buffer, nr);
if (len > 0 && (len -= nr) == 0)
break;
}