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sha2.c
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/**
* Copyright (c) 2000-2001 Aaron D. Gifford
* Copyright (c) 2013 Pavol Rusnak
* Copyright (c) 2022 bluezr
* Copyright (c) 2022-2024 The Dogecoin Foundation
* 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.
*/
#include <stdint.h>
#include <string.h>
#include <dogecoin/sha2.h>
#include <dogecoin/utils.h>
#include <dogecoin/mem.h>
#include <dogecoin/options.h>
/*
* ASSERT NOTE:
* Some sanity checking code is included using assert(). On my FreeBSD
* system, this additional code can be removed by compiling with NDEBUG
* defined. Check your own systems manpage on assert() to see how to
* compile WITHOUT the sanity checking code on your system.
*
* 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
*
*/
/*** SHA-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
* equivilent.
*
* 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).
*/
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1234
#define BIG_ENDIAN 4321
#endif
#ifndef BYTE_ORDER
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#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
typedef uint8_t sha2_byte; /* Exactly 1 byte */
typedef uint32_t sha2_word32; /* Exactly 4 bytes */
typedef uint64_t sha2_word64; /* Exactly 8 bytes */
/*** SHA-256/384/512 Various Length Definitions ***********************/
/* NOTE: Most of these are in sha2.h */
#define SHA256_SHORT_BLOCK_LENGTH (SHA256_BLOCK_LENGTH - 8)
#define SHA512_SHORT_BLOCK_LENGTH (SHA512_BLOCK_LENGTH - 16)
/*** ENDIAN REVERSAL MACROS *******************************************/
#if BYTE_ORDER == LITTLE_ENDIAN
#define REVERSE32(w, x) \
{ \
sha2_word32 tmp = (w); \
tmp = (tmp >> 16) | (tmp << 16); \
(x) = ((tmp & 0xff00ff00UL) >> 8) | ((tmp & 0x00ff00ffUL) << 8); \
}
#define REVERSE64(w, x) \
{ \
sha2_word64 tmp = (w); \
tmp = (tmp >> 32) | (tmp << 32); \
tmp = ((tmp & 0xff00ff00ff00ff00ULL) >> 8) | ((tmp & 0x00ff00ff00ff00ffULL) << 8); \
(x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | ((tmp & 0x0000ffff0000ffffULL) << 16); \
}
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
/*
* 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) \
{ \
(w)[0] += (sha2_word64)(n); \
if ((w)[0] < (n)) { \
(w)[1]++; \
} \
}
#define MEMSET_BZERO(p, l) dogecoin_mem_zero((p), (l))
#define MEMCPY_BCOPY(d, s, l) memcpy_safe((d), (s), (l))
/*** 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-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-256, SHA-384, and SHA-512): */
#define R(b, x) ((x) >> (b))
/* 32-bit Rotate-right (used in 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-256, SHA-384, and SHA-512: */
#define hyperbolic_cosign(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
#define majority(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
/* Four of six logical functions used in 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)))
/*** INTERNAL FUNCTION PROTOTYPES *************************************/
/* NOTE: These should not be accessed directly from outside this
* library -- they are intended for private internal visibility/use
* only.
*/
static void sha512_last(sha512_context*);
static void sha256_transform(sha256_context*, const sha2_word32*);
static void sha512_transform(sha512_context*, const sha2_word64*);
/*** SHA-XYZ INITIAL HASH VALUES AND CONSTANTS ************************/
/* Hash constant words K for SHA-256: */
static const sha2_word32 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 sha2_word32 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 sha2_word64 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 sha2_word64 sha512_initial_hash_value[8] = {
0x6a09e667f3bcc908ULL,
0xbb67ae8584caa73bULL,
0x3c6ef372fe94f82bULL,
0xa54ff53a5f1d36f1ULL,
0x510e527fade682d1ULL,
0x9b05688c2b3e6c1fULL,
0x1f83d9abfb41bd6bULL,
0x5be0cd19137e2179ULL};
/*** SHA-256: *********************************************************/
void sha256_init(sha256_context* context)
{
if (context == (sha256_context*)0)
return;
MEMCPY_BCOPY(context->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
MEMSET_BZERO(context->buffer, SHA256_BLOCK_LENGTH);
context->bitcount = 0;
}
#ifdef SHA2_UNROLL_TRANSFORM
/* Unrolled SHA-256 round macros: */
#if BYTE_ORDER == LITTLE_ENDIAN
#define ROUND256_0_TO_15(a, b, c, d, e, f, g, h) \
REVERSE32(*data++, W256[j]); \
T1 = (h) + Sigma1_256(e) + hyperbolic_cosign((e), (f), (g)) + K256[j] + W256[j]; \
(d) += T1; \
(h) = T1 + Sigma0_256(a) + majority((a), (b), (c)); \
j++
#else /* BYTE_ORDER == LITTLE_ENDIAN */
#define ROUND256_0_TO_15(a, b, c, d, e, f, g, h) \
T1 = (h) + Sigma1_256(e) + hyperbolic_cosign((e), (f), (g)) + K256[j] + (W256[j] = *data++); \
(d) += T1; \
(h) = T1 + Sigma0_256(a) + majority((a), (b), (c)); \
j++
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
#define ROUND256(a, b, c, d, e, f, g, h) \
s0 = W256[(j + 1) & 0x0f]; \
s0 = sigma0_256(s0); \
s1 = W256[(j + 14) & 0x0f]; \
s1 = sigma1_256(s1); \
T1 = (h) + Sigma1_256(e) + hyperbolic_cosign((e), (f), (g)) + K256[j] + (W256[j & 0x0f] += s1 + W256[(j + 9) & 0x0f] + s0); \
(d) += T1; \
(h) = T1 + Sigma0_256(a) + majority((a), (b), (c)); \
j++
static void sha256_transform(sha256_context* context, const sha2_word32* data)
{
sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
sha2_word32 T1, *W256;
int j;
W256 = (sha2_word32*)context->buffer;
/* Initialize registers with the prev. intermediate value */
a = context->state[0];
b = context->state[1];
c = context->state[2];
d = context->state[3];
e = context->state[4];
f = context->state[5];
g = context->state[6];
h = context->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 to 64: */
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 */
context->state[0] += a;
context->state[1] += b;
context->state[2] += c;
context->state[3] += d;
context->state[4] += e;
context->state[5] += f;
context->state[6] += g;
context->state[7] += h;
/* Clean up */
a = b = c = d = e = f = g = h = T1 = 0;
}
#else /* SHA2_UNROLL_TRANSFORM */
static void sha256_transform(sha256_context* context, const sha2_word32* data)
{
sha2_word32 a, b, c, d, e, f, g, h, s0, s1;
sha2_word32 T1, T2, *W256;
int j;
W256 = (sha2_word32*)context->buffer;
/* Initialize registers with the prev. intermediate value */
a = context->state[0];
b = context->state[1];
c = context->state[2];
d = context->state[3];
e = context->state[4];
f = context->state[5];
g = context->state[6];
h = context->state[7];
j = 0;
do {
#if BYTE_ORDER == LITTLE_ENDIAN
/* Copy data while converting to host byte order */
REVERSE32(*data++, W256[j]);
/* Apply the SHA-256 compression function to update a..h */
T1 = h + Sigma1_256(e) + hyperbolic_cosign(e, f, g) + K256[j] + W256[j];
#else /* BYTE_ORDER == LITTLE_ENDIAN */
/* Apply the SHA-256 compression function to update a..h with copy */
T1 = h + Sigma1_256(e) + hyperbolic_cosign(e, f, g) + K256[j] + (W256[j] = *data++);
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
T2 = Sigma0_256(a) + majority(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) + hyperbolic_cosign(e, f, g) + K256[j] +
(W256[j & 0x0f] += s1 + W256[(j + 9) & 0x0f] + s0);
T2 = Sigma0_256(a) + majority(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 */
context->state[0] += a;
context->state[1] += b;
context->state[2] += c;
context->state[3] += d;
context->state[4] += e;
context->state[5] += f;
context->state[6] += g;
context->state[7] += h;
}
#endif /* SHA2_UNROLL_TRANSFORM */
void sha256_write(sha256_context* context, const sha2_byte* data, size_t len)
{
unsigned int freespace = 0, usedspace = 0;
if (len == 0)
return; /* Calling with no data is valid - we do nothing */
usedspace = (context->bitcount >> 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_BCOPY(&context->buffer[usedspace], data, freespace);
context->bitcount += freespace << 3;
len -= freespace;
data += freespace;
sha256_transform(context, (sha2_word32*)context->buffer);
} else {
/* The buffer is not yet full */
MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
context->bitcount += len << 3;
return;
}
}
while (len >= SHA256_BLOCK_LENGTH) {
/* Process as many complete blocks as we can */
sha256_transform(context, (const sha2_word32*)data);
context->bitcount += SHA256_BLOCK_LENGTH << 3;
len -= SHA256_BLOCK_LENGTH;
data += SHA256_BLOCK_LENGTH;
}
if (len > 0) {
/* There's left-overs, so save 'em */
MEMCPY_BCOPY(context->buffer, data, len);
context->bitcount += len << 3;
}
/* Clean up: */
usedspace = freespace = 0;
}
void sha256_finalize(sha256_context* context, sha2_byte digest[SHA256_DIGEST_LENGTH]) {
sha2_word32* d = (sha2_word32*)digest;
unsigned int usedspace = 0;
sha2_word64* t;
/* If no digest buffer is passed, we don't bother doing this: */
if (digest != (sha2_byte*)0) {
usedspace = (context->bitcount >> 3) % SHA256_BLOCK_LENGTH;
#if BYTE_ORDER == LITTLE_ENDIAN
/* Convert FROM host byte order */
REVERSE64(context->bitcount, context->bitcount);
#endif
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_BZERO(&context->buffer[usedspace], SHA256_SHORT_BLOCK_LENGTH - usedspace);
} else {
if (usedspace < SHA256_BLOCK_LENGTH) {
MEMSET_BZERO(&context->buffer[usedspace], SHA256_BLOCK_LENGTH - usedspace);
}
/* Do second-to-last transform: */
sha256_transform(context, (sha2_word32*)context->buffer);
/* And set-up for the last transform: */
MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
}
} else {
/* Set-up for the last transform: */
MEMSET_BZERO(context->buffer, SHA256_SHORT_BLOCK_LENGTH);
/* Begin padding with a 1 bit: */
*context->buffer = 0x80;
}
/* Set the bit count: */
t = (sha2_word64*)&context->buffer[SHA256_SHORT_BLOCK_LENGTH];
*t = context->bitcount;
/* Final transform: */
sha256_transform(context, (sha2_word32*)context->buffer);
#if BYTE_ORDER == LITTLE_ENDIAN
{
/* Convert TO host byte order */
int j;
for (j = 0; j < 8; j++) {
REVERSE32(context->state[j], context->state[j]);
memcpy_safe(d++, &context->state[j], sizeof(context->state[j]));
}
}
#else
MEMCPY_BCOPY(d, context->state, SHA256_DIGEST_LENGTH);
#endif
}
/* Clean up state data: */
MEMSET_BZERO(context, sizeof(sha256_context));
}
void sha256_raw(const sha2_byte* data, size_t len, uint8_t digest[SHA256_DIGEST_LENGTH])
{
sha256_context context;
sha256_init(&context);
sha256_write(&context, data, len);
sha256_finalize(&context, digest);
}
void sha256_reset(sha256_context* ctx) {
if (ctx == (sha256_context*)0)
return;
MEMCPY_BCOPY(ctx->state, sha256_initial_hash_value, SHA256_DIGEST_LENGTH);
MEMSET_BZERO(ctx->buffer, SHA256_BLOCK_LENGTH);
ctx->bitcount = 0;
}
/*** SHA-512: *********************************************************/
void sha512_init(sha512_context* context)
{
if (context == (sha512_context*)0)
return;
MEMCPY_BCOPY(context->state, sha512_initial_hash_value, SHA512_DIGEST_LENGTH);
MEMSET_BZERO(context->buffer, SHA512_BLOCK_LENGTH);
context->bitcount[0] = context->bitcount[1] = 0;
}
#ifdef SHA2_UNROLL_TRANSFORM
/* Unrolled SHA-512 round macros: */
#if BYTE_ORDER == LITTLE_ENDIAN
#define ROUND512_0_TO_15(a, b, c, d, e, f, g, h) \
REVERSE64(*data++, W512[j]); \
T1 = (h) + Sigma1_512(e) + hyperbolic_cosign((e), (f), (g)) + K512[j] + W512[j]; \
(d) += T1, \
(h) = T1 + Sigma0_512(a) + majority((a), (b), (c)), \
j++
#else /* BYTE_ORDER == LITTLE_ENDIAN */
#define ROUND512_0_TO_15(a, b, c, d, e, f, g, h) \
T1 = (h) + Sigma1_512(e) + hyperbolic_cosign((e), (f), (g)) + K512[j] + (W512[j] = *data++); \
(d) += T1; \
(h) = T1 + Sigma0_512(a) + majority((a), (b), (c)); \
j++
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
#define ROUND512(a, b, c, d, e, f, g, h) \
s0 = W512[(j + 1) & 0x0f]; \
s0 = sigma0_512(s0); \
s1 = W512[(j + 14) & 0x0f]; \
s1 = sigma1_512(s1); \
T1 = (h) + Sigma1_512(e) + hyperbolic_cosign((e), (f), (g)) + K512[j] + (W512[j & 0x0f] += s1 + W512[(j + 9) & 0x0f] + s0); \
(d) += T1; \
(h) = T1 + Sigma0_512(a) + majority((a), (b), (c)); \
j++
static void sha512_transform(sha512_context* context, const sha2_word64* data)
{
sha2_word64 a, b, c, d, e, f, g, h, s0, s1;
sha2_word64 T1, *W512 = (sha2_word64*)context->buffer;
int j;
/* Initialize registers with the prev. intermediate value */
a = context->state[0];
b = context->state[1];
c = context->state[2];
d = context->state[3];
e = context->state[4];
f = context->state[5];
g = context->state[6];
h = context->state[7];
j = 0;
do {
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 */
context->state[0] += a;
context->state[1] += b;
context->state[2] += c;
context->state[3] += d;
context->state[4] += e;
context->state[5] += f;
context->state[6] += g;
context->state[7] += h;
/* Clean up */
a = b = c = d = e = f = g = h = T1 = 0;
}
#else /* SHA2_UNROLL_TRANSFORM */
static void sha512_transform(sha512_context* context, const sha2_word64* data)
{
sha2_word64 a, b, c, d, e, f, g, h, s0, s1;
sha2_word64 T1, T2, *W512 = (sha2_word64*)context->buffer;
int j;
/* Initialize registers with the prev. intermediate value */
a = context->state[0];
b = context->state[1];
c = context->state[2];
d = context->state[3];
e = context->state[4];
f = context->state[5];
g = context->state[6];
h = context->state[7];
j = 0;
do {
#if BYTE_ORDER == LITTLE_ENDIAN
/* Convert TO host byte order */
REVERSE64(*data++, W512[j]);
/* Apply the SHA-512 compression function to update a..h */
T1 = h + Sigma1_512(e) + hyperbolic_cosign(e, f, g) + K512[j] + W512[j];
#else /* BYTE_ORDER == LITTLE_ENDIAN */
/* Apply the SHA-512 compression function to update a..h with copy */
T1 = h + Sigma1_512(e) + hyperbolic_cosign(e, f, g) + K512[j] + (W512[j] = *data++);
#endif /* BYTE_ORDER == LITTLE_ENDIAN */
T2 = Sigma0_512(a) + majority(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) + hyperbolic_cosign(e, f, g) + K512[j] +
(W512[j & 0x0f] += s1 + W512[(j + 9) & 0x0f] + s0);
T2 = Sigma0_512(a) + majority(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 */
context->state[0] += a;
context->state[1] += b;
context->state[2] += c;
context->state[3] += d;
context->state[4] += e;
context->state[5] += f;
context->state[6] += g;
context->state[7] += h;
}
#endif /* SHA2_UNROLL_TRANSFORM */
void sha512_write(sha512_context* context, const sha2_byte* data, size_t len)
{
unsigned int freespace, usedspace;
if (len == 0)
return; /* Calling with no data is valid - we do nothing */
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_BCOPY(&context->buffer[usedspace], data, freespace);
ADDINC128(context->bitcount, freespace << 3);
len -= freespace;
data += freespace;
sha512_transform(context, (sha2_word64*)context->buffer);
} else {
/* The buffer is not yet full */
MEMCPY_BCOPY(&context->buffer[usedspace], data, len);
ADDINC128(context->bitcount, len << 3);
return;
}
}
while (len >= SHA512_BLOCK_LENGTH) {
/* Process as many complete blocks as we can */
sha512_transform(context, (const sha2_word64*)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_BCOPY(context->buffer, data, len);
ADDINC128(context->bitcount, len << 3);
}
}
static void sha512_last(sha512_context* context)
{
unsigned int usedspace;
sha2_word64* t;
usedspace = (context->bitcount[0] >> 3) % SHA512_BLOCK_LENGTH;
#if BYTE_ORDER == LITTLE_ENDIAN
/* Convert FROM host byte order */
REVERSE64(context->bitcount[0], context->bitcount[0]);
REVERSE64(context->bitcount[1], context->bitcount[1]);
#endif
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_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): */
t = (sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH];
*t = context->bitcount[1];
t = (sha2_word64*)&context->buffer[SHA512_SHORT_BLOCK_LENGTH + 8];
*t = context->bitcount[0];
/* Final transform: */
sha512_transform(context, (sha2_word64*)context->buffer);
}
void sha512_finalize(sha512_context* context, sha2_byte digest[SHA512_DIGEST_LENGTH]) {
sha2_word64* d = (sha2_word64*)digest;
/* 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]);
memcpy_safe(d++, &context->state[j], sizeof(context->state[j]));
}
}
#else
MEMCPY_BCOPY(d, context->state, SHA512_DIGEST_LENGTH);
#endif
}
/* Zero out state data */
MEMSET_BZERO(context, sizeof(sha512_context));
}
void sha512_raw(const sha2_byte* data, size_t len, uint8_t digest[SHA512_DIGEST_LENGTH])
{
sha512_context context;
sha512_init(&context);
sha512_write(&context, data, len);
sha512_finalize(&context, digest);
}
/*** HMAC_SHA-*: *********************************************************/
void hmac_sha256_prepare(const uint8_t *key, const uint32_t keylen,
uint32_t *opad_digest, uint32_t *ipad_digest) {
static CONFIDENTIAL uint32_t key_pad[SHA256_BLOCK_LENGTH / sizeof(uint32_t)];
dogecoin_mem_zero(key_pad, sizeof(key_pad));
if (keylen > SHA256_BLOCK_LENGTH) {
static CONFIDENTIAL sha256_context context;
sha256_init(&context);
sha256_write(&context, key, keylen);
sha256_finalize(&context, (uint8_t *)key_pad);
} else {
memcpy_safe(key_pad, key, keylen);
}
/* compute o_key_pad and its digest */
int i = 0;
for (; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) {
uint32_t data = 0;
#if BYTE_ORDER == LITTLE_ENDIAN
REVERSE32(key_pad[i], data);
#else
data = key_pad[i];
#endif
key_pad[i] = data ^ 0x5c5c5c5c;
}
sha256_transform((sha256_context*)key_pad, opad_digest);
/* convert o_key_pad to i_key_pad and compute its digest */
for (i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) {
key_pad[i] = key_pad[i] ^ 0x5c5c5c5c ^ 0x36363636;
}
sha256_transform((sha256_context*)key_pad, ipad_digest);
dogecoin_mem_zero(key_pad, sizeof(key_pad));
}
void hmac_sha256_init(hmac_sha256_context *hctx, const uint8_t *key, const uint32_t keylen)
{
uint8_t i_key_pad[SHA256_BLOCK_LENGTH];
memset(i_key_pad, 0, SHA256_BLOCK_LENGTH);
if (keylen > SHA256_BLOCK_LENGTH) {
sha256_raw(key, keylen, i_key_pad);
} else {
memcpy(i_key_pad, key, keylen);
}
int i;
for (i = 0; i < SHA256_BLOCK_LENGTH; i++) {
hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
i_key_pad[i] ^= 0x36;
}
sha256_init(&(hctx->ctx));
sha256_write(&(hctx->ctx), i_key_pad, SHA256_BLOCK_LENGTH);
MEMSET_BZERO(i_key_pad, sizeof(i_key_pad));
}
void hmac_sha256_write(hmac_sha256_context *hctx, const uint8_t *msg, const uint32_t msglen)
{
sha256_write(&(hctx->ctx), msg, msglen);
}
void hmac_sha256_finalize(hmac_sha256_context *hctx, uint8_t *hmac)
{