/*-
* Copyright 2005 Colin Percival
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 CONTRIBUTORS 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/endian.h>
#include <sys/types.h>
#include <string.h>
#include "sha512.h"
#if BYTE_ORDER == BIG_ENDIAN
/* Copy a vector of big-endian uint64_t into a vector of bytes */
#define be64enc_vect(dst, src, len) \
memcpy((void *)dst, (const void *)src, (size_t)len)
/* Copy a vector of bytes into a vector of big-endian uint64_t */
#define be64dec_vect(dst, src, len) \
memcpy((void *)dst, (const void *)src, (size_t)len)
#else /* BYTE_ORDER != BIG_ENDIAN */
/*
* Encode a length len/4 vector of (uint64_t) into a length len vector of
* (unsigned char) in big-endian form. Assumes len is a multiple of 8.
*/
static void
be64enc_vect(unsigned char *dst, const uint64_t *src, size_t len)
{
size_t i;
for (i = 0; i < len / 8; i++)
be64enc(dst + i * 8, src[i]);
}
/*
* Decode a big-endian length len vector of (unsigned char) into a length
* len/4 vector of (uint64_t). Assumes len is a multiple of 8.
*/
static void
be64dec_vect(uint64_t *dst, const unsigned char *src, size_t len)
{
size_t i;
for (i = 0; i < len / 8; i++)
dst[i] = be64dec(src + i * 8);
}
#endif /* BYTE_ORDER != BIG_ENDIAN */
/* Elementary functions used by SHA512 */
#define Ch(x, y, z) ((x & (y ^ z)) ^ z)
#define Maj(x, y, z) ((x & (y | z)) | (y & z))
#define SHR(x, n) (x >> n)
#define ROTR(x, n) ((x >> n) | (x << (64 - n)))
#define S0(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define S1(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))
#define s0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^ SHR(x, 7))
#define s1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^ SHR(x, 6))
/* SHA512 round function */
#define RND(a, b, c, d, e, f, g, h, k) \
t0 = h + S1(e) + Ch(e, f, g) + k; \
t1 = S0(a) + Maj(a, b, c); \
d += t0; \
h = t0 + t1;
/* Adjusted round function for rotating state */
#define RNDr(S, W, i, k) \
RND(S[(80 - i) % 8], S[(81 - i) % 8], \
S[(82 - i) % 8], S[(83 - i) % 8], \
S[(84 - i) % 8], S[(85 - i) % 8], \
S[(86 - i) % 8], S[(87 - i) % 8], \
W[i] + k)
/*
* SHA512 block compression function. The 512-bit state is transformed via
* the 512-bit input block to produce a new state.
*/
static void
SHA512_Transform(uint64_t * state, const unsigned char block[128])
{
uint64_t W[80];
uint64_t S[8];
uint64_t t0, t1;
int i;
/* 1. Prepare message schedule W. */
be64dec_vect(W, block, 128);
for (i = 16; i < 80; i++)
W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
/* 2. Initialize working variables. */
memcpy(S, state, 64);
/* 3. Mix. */
RNDr(S, W, 0, 0x428a2f98d728ae22ULL);
RNDr(S, W, 1, 0x7137449123ef65cdULL);
RNDr(S, W, 2, 0xb5c0fbcfec4d3b2fULL);
RNDr(S, W, 3, 0xe9b5dba58189dbbcULL);
RNDr(S, W, 4, 0x3956c25bf348b538ULL);
RNDr(S, W, 5, 0x59f111f1b605d019ULL);
RNDr(S, W, 6, 0x923f82a4af194f9bULL);
RNDr(S, W, 7, 0xab1c5ed5da6d8118ULL);
RNDr(S, W, 8, 0xd807aa98a3030242ULL);
RNDr(S, W, 9, 0x12835b0145706fbeULL);
RNDr(S, W, 10, 0x243185be4ee4b28cULL);
RNDr(S, W, 11, 0x550c7dc3d5ffb4e2ULL);
RNDr(S, W, 12, 0x72be5d74f27b896fULL);
RNDr(S, W, 13, 0x80deb1fe3b1696b1ULL);
RNDr(S, W, 14, 0x9bdc06a725c71235ULL);
RNDr(S, W, 15, 0xc19bf174cf692694ULL);
RNDr(S, W, 16, 0xe49b69c19ef14ad2ULL);
RNDr(S, W, 17, 0xefbe4786384f25e3ULL);
RNDr(S, W, 18, 0x0fc19dc68b8cd5b5ULL);
RNDr(S, W, 19, 0x240ca1cc77ac9c65ULL);
RNDr(S, W, 20, 0x2de92c6f592b0275ULL);
RNDr(S, W, 21, 0x4a7484aa6ea6e483ULL);
RNDr(S, W, 22, 0x5cb0a9dcbd41fbd4ULL);
RNDr(S, W, 23, 0x76f988da831153b5ULL);
RNDr(S, W, 24, 0x983e5152ee66dfabULL);
RNDr(S, W, 25, 0xa831c66d2db43210ULL);
RNDr(S, W, 26, 0xb00327c898fb213fULL);
RNDr(S, W, 27, 0xbf597fc7beef0ee4ULL);
RNDr(S, W, 28, 0xc6e00bf33da88fc2ULL);
RNDr(S, W, 29, 0xd5a79147930aa725ULL);
RNDr(S, W, 30, 0x06ca6351e003826fULL);
RNDr(S, W, 31, 0x142929670a0e6e70ULL);
RNDr(S, W, 32, 0x27b70a8546d22ffcULL);
RNDr(S, W, 33, 0x2e1b21385c26c926ULL);
RNDr(S, W, 34, 0x4d2c6dfc5ac42aedULL);
RNDr(S, W, 35, 0x53380d139d95b3dfULL);
RNDr(S, W, 36, 0x650a73548baf63deULL);
RNDr(S, W, 37, 0x766a0abb3c77b2a8ULL);
RNDr(S, W, 38, 0x81c2c92e47edaee6ULL);
RNDr(S, W, 39, 0x92722c851482353bULL);
RNDr(S, W, 40, 0xa2bfe8a14cf10364ULL);
RNDr(S, W, 41, 0xa81a664bbc423001ULL);
RNDr(S, W, 42, 0xc24b8b70d0f89791ULL);
RNDr(S, W, 43, 0xc76c51a30654be30ULL);
RNDr(S, W, 44, 0xd192e819d6ef5218ULL);
RNDr(S, W, 45, 0xd69906245565a910ULL);
RNDr(S, W, 46, 0xf40e35855771202aULL);
RNDr(S, W, 47, 0x106aa07032bbd1b8ULL);
RNDr(S, W, 48, 0x19a4c116b8d2d0c8ULL);
RNDr(S, W, 49, 0x1e376c085141ab53ULL);
RNDr(S, W, 50, 0x2748774cdf8eeb99ULL);
RNDr(S, W, 51, 0x34b0bcb5e19b48a8ULL);
RNDr(S, W, 52, 0x391c0cb3c5c95a63ULL);
RNDr(S, W, 53, 0x4ed8aa4ae3418acbULL);
RNDr(S, W, 54, 0x5b9cca4f7763e373ULL);
RNDr(S, W, 55, 0x682e6ff3d6b2b8a3ULL);
RNDr(S, W, 56, 0x748f82ee5defb2fcULL);
RNDr(S, W, 57, 0x78a5636f43172f60ULL);
RNDr(S, W, 58, 0x84c87814a1f0ab72ULL);
RNDr(S, W, 59, 0x8cc702081a6439ecULL);
RNDr(S, W, 60, 0x90befffa23631e28ULL);
RNDr(S, W, 61, 0xa4506cebde82bde9ULL);
RNDr(S, W, 62, 0xbef9a3f7b2c67915ULL);
RNDr(S, W, 63, 0xc67178f2e372532bULL);
RNDr(S, W, 64, 0xca273eceea26619cULL);
RNDr(S, W, 65, 0xd186b8c721c0c207ULL);
RNDr(S, W, 66, 0xeada7dd6cde0eb1eULL);
RNDr(S, W, 67, 0xf57d4f7fee6ed178ULL);
RNDr(S, W, 68, 0x06f067aa72176fbaULL);
RNDr(S, W, 69, 0x0a637dc5a2c898a6ULL);
RNDr(S, W, 70, 0x113f9804bef90daeULL);
RNDr(S, W, 71, 0x1b710b35131c471bULL);
RNDr(S, W, 72, 0x28db77f523047d84ULL);
RNDr(S, W, 73, 0x32caab7b40c72493ULL);
RNDr(S, W, 74, 0x3c9ebe0a15c9bebcULL);
RNDr(S, W, 75, 0x431d67c49c100d4cULL);
RNDr(S, W, 76, 0x4cc5d4becb3e42b6ULL);
RNDr(S, W, 77, 0x597f299cfc657e2aULL);
RNDr(S, W, 78, 0x5fcb6fab3ad6faecULL);
RNDr(S, W, 79, 0x6c44198c4a475817ULL);
/* 4. Mix local working variables into global state */
for (i = 0; i < 8; i++)
state[i] += S[i];
}
static const unsigned char PAD[128] = {
0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/* Add padding and terminating bit-count. */
static void
SHA512_Pad(SHA512_CTX * ctx)
{
unsigned char len[16];
uint64_t r, plen;
/*
* Convert length to a vector of bytes -- we do this now rather
* than later because the length will change after we pad.
*/
be64enc_vect(len, ctx->count, 16);
/* Add 1--128 bytes so that the resulting length is 112 mod 128 */
r = (ctx->count[1] >> 3) & 0x7f;
plen = (r < 112) ? (112 - r) : (240 - r);
SHA512_Update(ctx, PAD, (size_t)plen);
/* Add the terminating bit-count */
SHA512_Update(ctx, len, 16);
}
/* SHA-512 initialization. Begins a SHA-512 operation. */
void
SHA512_Init(SHA512_CTX * ctx)
{
/* Zero bits processed so far */
ctx->count[0] = ctx->count[1] = 0;
/* Magic initialization constants */
ctx->state[0] = 0x6a09e667f3bcc908ULL;
ctx->state[1] = 0xbb67ae8584caa73bULL;
ctx->state[2] = 0x3c6ef372fe94f82bULL;
ctx->state[3] = 0xa54ff53a5f1d36f1ULL;
ctx->state[4] = 0x510e527fade682d1ULL;
ctx->state[5] = 0x9b05688c2b3e6c1fULL;
ctx->state[6] = 0x1f83d9abfb41bd6bULL;
ctx->state[7] = 0x5be0cd19137e2179ULL;
}
/* Add bytes into the hash */
void
SHA512_Update(SHA512_CTX * ctx, const void *in, size_t len)
{
uint64_t bitlen[2];
uint64_t r;
const unsigned char *src = in;
/* Number of bytes left in the buffer from previous updates */
r = (ctx->count[1] >> 3) & 0x7f;
/* Convert the length into a number of bits */
bitlen[1] = ((uint64_t)len) << 3;
bitlen[0] = ((uint64_t)len) >> 61;
/* Update number of bits */
if ((ctx->count[1] += bitlen[1]) < bitlen[1])
ctx->count[0]++;
ctx->count[0] += bitlen[0];
/* Handle the case where we don't need to perform any transforms */
if (len < 128 - r) {
memcpy(&ctx->buf[r], src, len);
return;
}
/* Finish the current block */
memcpy(&ctx->buf[r], src, 128 - r);
SHA512_Transform(ctx->state, ctx->buf);
src += 128 - r;
len -= 128 - r;
/* Perform complete blocks */
while (len >= 128) {
SHA512_Transform(ctx->state, src);
src += 128;
len -= 128;
}
/* Copy left over data into buffer */
memcpy(ctx->buf, src, len);
}
/*
* SHA-512 finalization. Pads the input data, exports the hash value,
* and clears the context state.
*/
void
SHA512_Final(unsigned char digest[64], SHA512_CTX * ctx)
{
/* Add padding */
SHA512_Pad(ctx);
/* Write the hash */
be64enc_vect(digest, ctx->state, 64);
/* Clear the context state */
memset((void *)ctx, 0, sizeof(*ctx));
}
