/*
* Copyright (C) 2006-2009 Vincent Hanquez <vincent@snarc.org>
* 2016 Herbert Valerio Riedel <hvr@gnu.org>
*
* 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 ``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 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.
*/
#ifndef CRYPTOHASH_SHA512_H
#define CRYPTOHASH_SHA512_H
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stddef.h>
#include <assert.h>
#include <string.h>
#include <ghcautoconf.h>
struct sha512_ctx
{
uint64_t sz;
uint64_t sz_hi;
uint8_t buf[128];
uint64_t h[8];
};
/* keep this synchronised with 'digestSize'/'sizeCtx' in SHA512.hs */
#define SHA512_DIGEST_SIZE 64
#define SHA512t_DIGEST_SIZE(t) (((t)+7)/8)
#define SHA384_DIGEST_SIZE 48
#define SHA512_CTX_SIZE 208
/* NB: SHA384 and SHA512/t are essentially the same algorithm as SHA512 and
* therefore share the same data structures and most of the codepaths
* except for different initialization data and truncating the 512bit
* digest down to the respective digest bit-length.
*/
static inline void hs_cryptohash_sha384_init(struct sha512_ctx *ctx);
static inline void hs_cryptohash_sha512_init (struct sha512_ctx *ctx);
static inline void hs_cryptohash_sha512t_init(struct sha512_ctx *ctx, const uint16_t t);
static inline void hs_cryptohash_sha512_update (struct sha512_ctx *ctx, const uint8_t *data, size_t len);
static inline uint64_t hs_cryptohash_sha512t_finalize (struct sha512_ctx *ctx, uint16_t outbits, uint8_t *out);
#if defined(static_assert)
static_assert(sizeof(struct sha512_ctx) == SHA512_CTX_SIZE, "unexpected sha512_ctx size");
#else
/* poor man's pre-C11 _Static_assert */
typedef char static_assertion__unexpected_sha512_ctx_size[(sizeof(struct sha512_ctx) == SHA512_CTX_SIZE)?1:-1];
#endif
#define ptr_uint64_aligned(ptr) (!((uintptr_t)(ptr) & 0x7))
static inline uint64_t
ror64(const uint64_t word, const unsigned shift)
{
/* GCC usually transforms this into a 'ror'-insn */
return (word >> shift) | (word << (64 - shift));
}
static inline uint64_t
cpu_to_be64(const uint64_t hll)
{
#if WORDS_BIGENDIAN
return hll;
#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
return __builtin_bswap64(hll);
#else
/* GCC & Clang usually transforms this into a bswap insn */
return ((hll & 0xff00000000000000) >> 56) |
((hll & 0x00ff000000000000) >> 40) |
((hll & 0x0000ff0000000000) >> 24) |
((hll & 0x000000ff00000000) >> 8) |
((hll & 0x00000000ff000000) << 8) |
((hll & 0x0000000000ff0000) << 24) |
((hll & 0x000000000000ff00) << 40) |
((hll & 0x00000000000000ff) << 56);
#endif
}
static inline void
cpu_to_be64_array(uint64_t *dest, const uint64_t *src, unsigned wordcnt)
{
while (wordcnt--)
*dest++ = cpu_to_be64(*src++);
}
static inline void
hs_cryptohash_sha512_init (struct sha512_ctx *ctx)
{
memset(ctx, 0, SHA512_CTX_SIZE);
ctx->h[0] = 0x6a09e667f3bcc908ULL;
ctx->h[1] = 0xbb67ae8584caa73bULL;
ctx->h[2] = 0x3c6ef372fe94f82bULL;
ctx->h[3] = 0xa54ff53a5f1d36f1ULL;
ctx->h[4] = 0x510e527fade682d1ULL;
ctx->h[5] = 0x9b05688c2b3e6c1fULL;
ctx->h[6] = 0x1f83d9abfb41bd6bULL;
ctx->h[7] = 0x5be0cd19137e2179ULL;
}
static inline void
hs_cryptohash_sha384_init (struct sha512_ctx *ctx)
{
memset(ctx, 0, SHA512_CTX_SIZE);
ctx->h[0] = 0xcbbb9d5dc1059ed8ULL;
ctx->h[1] = 0x629a292a367cd507ULL;
ctx->h[2] = 0x9159015a3070dd17ULL;
ctx->h[3] = 0x152fecd8f70e5939ULL;
ctx->h[4] = 0x67332667ffc00b31ULL;
ctx->h[5] = 0x8eb44a8768581511ULL;
ctx->h[6] = 0xdb0c2e0d64f98fa7ULL;
ctx->h[7] = 0x47b5481dbefa4fa4ULL;
}
static inline void
hs_cryptohash_sha512t_init(struct sha512_ctx *ctx, const uint16_t t)
{
memset(ctx, 0, SHA512_CTX_SIZE);
if (!((0 < t) && (t < 512)))
return;
/* shortcuts for the currently two FIPS 180-4 "approved" parameters */
switch (t) {
case 224:
ctx->h[0] = 0x8c3d37c819544da2ULL;
ctx->h[1] = 0x73e1996689dcd4d6ULL;
ctx->h[2] = 0x1dfab7ae32ff9c82ULL;
ctx->h[3] = 0x679dd514582f9fcfULL;
ctx->h[4] = 0x0f6d2b697bd44da8ULL;
ctx->h[5] = 0x77e36f7304c48942ULL;
ctx->h[6] = 0x3f9d85a86a1d36c8ULL;
ctx->h[7] = 0x1112e6ad91d692a1ULL;
return;
case 256:
ctx->h[0] = 0x22312194fc2bf72cULL;
ctx->h[1] = 0x9f555fa3c84c64c2ULL;
ctx->h[2] = 0x2393b86b6f53b151ULL;
ctx->h[3] = 0x963877195940eabdULL;
ctx->h[4] = 0x96283ee2a88effe3ULL;
ctx->h[5] = 0xbe5e1e2553863992ULL;
ctx->h[6] = 0x2b0199fc2c85b8aaULL;
ctx->h[7] = 0x0eb72ddc81c52ca2ULL;
return;
}
/* slow path */
hs_cryptohash_sha512_init(ctx);
for (int i = 0; i < 8; i++)
ctx->h[i] ^= 0xa5a5a5a5a5a5a5a5ULL;
uint64_t out[8] = { 0, };
{
char buf[16] = { 0, };
const int bufsz = snprintf(buf, 16, "SHA-512/%d", t);
hs_cryptohash_sha512_update(ctx, (uint8_t*)buf, bufsz);
hs_cryptohash_sha512t_finalize(ctx, 512, (uint8_t*)out);
}
/* re-init the context, otherwise len is changed */
memset(ctx, 0, SHA512_CTX_SIZE);
for (int i = 0; i < 8; i++)
ctx->h[i] = cpu_to_be64(out[i]);
}
/* 232 times the cube root of the first 64 primes 2..311 */
static const uint64_t k[] = {
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
};
#define e0(x) (ror64(x, 28) ^ ror64(x, 34) ^ ror64(x, 39))
#define e1(x) (ror64(x, 14) ^ ror64(x, 18) ^ ror64(x, 41))
#define s0(x) (ror64(x, 1) ^ ror64(x, 8) ^ (x >> 7))
#define s1(x) (ror64(x, 19) ^ ror64(x, 61) ^ (x >> 6))
static void
sha512_do_chunk_aligned(struct sha512_ctx *ctx, uint64_t w[])
{
int i;
for (i = 16; i < 80; i++)
w[i] = s1(w[i - 2]) + w[i - 7] + s0(w[i - 15]) + w[i - 16];
uint64_t a = ctx->h[0];
uint64_t b = ctx->h[1];
uint64_t c = ctx->h[2];
uint64_t d = ctx->h[3];
uint64_t e = ctx->h[4];
uint64_t f = ctx->h[5];
uint64_t g = ctx->h[6];
uint64_t h = ctx->h[7];
#define R(a, b, c, d, e, f, g, h, k, w) \
t1 = h + e1(e) + (g ^ (e & (f ^ g))) + k + w; \
t2 = e0(a) + ((a & b) | (c & (a | b))); \
d += t1; \
h = t1 + t2
for (i = 0; i < 80; i += 8) {
uint64_t t1, t2;
R(a, b, c, d, e, f, g, h, k[i + 0], w[i + 0]);
R(h, a, b, c, d, e, f, g, k[i + 1], w[i + 1]);
R(g, h, a, b, c, d, e, f, k[i + 2], w[i + 2]);
R(f, g, h, a, b, c, d, e, k[i + 3], w[i + 3]);
R(e, f, g, h, a, b, c, d, k[i + 4], w[i + 4]);
R(d, e, f, g, h, a, b, c, k[i + 5], w[i + 5]);
R(c, d, e, f, g, h, a, b, k[i + 6], w[i + 6]);
R(b, c, d, e, f, g, h, a, k[i + 7], w[i + 7]);
}
#undef R
ctx->h[0] += a;
ctx->h[1] += b;
ctx->h[2] += c;
ctx->h[3] += d;
ctx->h[4] += e;
ctx->h[5] += f;
ctx->h[6] += g;
ctx->h[7] += h;
}
static void
sha512_do_chunk(struct sha512_ctx *ctx, const uint8_t buf[])
{
uint64_t w[80]; /* only first 16 words are filled in */
if (ptr_uint64_aligned(buf)) { /* aligned buf */
cpu_to_be64_array(w, (const uint64_t *)buf, 16);
} else { /* unaligned buf */
memcpy(w, buf, 128);
#if !WORDS_BIGENDIAN
cpu_to_be64_array(w, w, 16);
#endif
}
sha512_do_chunk_aligned(ctx, w);
}
static inline void
hs_cryptohash_sha512_update(struct sha512_ctx *ctx, const uint8_t *data, size_t len)
{
size_t index = ctx->sz & 0x7f;
const size_t to_fill = 128 - index;
ctx->sz += len;
// handle overflow
if (ctx->sz < len)
ctx->sz_hi++;
/* process partial buffer if there's enough data to make a block */
if (index && len >= to_fill) {
memcpy(ctx->buf + index, data, to_fill);
sha512_do_chunk(ctx, ctx->buf);
/* memset(ctx->buf, 0, 128); */
len -= to_fill;
data += to_fill;
index = 0;
}
/* process as many 128b-blocks as possible */
while (len >= 128) {
sha512_do_chunk(ctx, data);
len -= 128;
data += 128;
}
/* append data into buf */
if (len)
memcpy(ctx->buf + index, data, len);
}
static inline uint64_t
hs_cryptohash_sha512t_finalize (struct sha512_ctx *ctx, uint16_t outbits, uint8_t *out)
{
static const uint8_t padding[128] = { 0x80, };
const uint64_t sz = ctx->sz;
/* add padding and update data with it */
uint64_t bits[2];
bits[0] = cpu_to_be64((ctx->sz_hi << 3) | (ctx->sz >> 61));
bits[1] = cpu_to_be64(ctx->sz << 3);
/* pad out to 112 */
const size_t index = ctx->sz & 0x7f;
const size_t padlen = (index < 112) ? (112 - index) : ((128 + 112) - index);
hs_cryptohash_sha512_update(ctx, padding, padlen);
/* append length */
hs_cryptohash_sha512_update(ctx, (uint8_t *) bits, sizeof(bits));
/* output hash */
if (outbits > 512)
outbits = 512; /* clamp to <= 512; better safe than sorry */
if(outbits % 64 == 0) {
/* fast path for 0,64,128,192,256,320,384,448,512 */
cpu_to_be64_array((uint64_t *) out, ctx->h, outbits/64);
} else {
/* slow-path */
uint8_t buf[SHA512_DIGEST_SIZE] = { 0x00, };
cpu_to_be64_array((uint64_t *) buf, ctx->h, 8);
const unsigned outbytes = SHA512t_DIGEST_SIZE(outbits);
assert(outbytes > 0);
assert(outbytes <= SHA512_DIGEST_SIZE);
/* Handle case of t parameter not being an integral amount of
* octects. FIPS 180-4 states that "the resulting message digest
* is truncated by selecting an appropriate number of the leftmost
* bits". Hence in such a case we apply a mask to retain the
* appropriate number of leftmost bits in the rightmost retained
* octet.
*/
const uint8_t outmask = ~(((uint8_t)0xff) >> (outbits % 8));
if (outmask)
buf[outbytes-1] &= outmask;
memcpy(out, buf, outbytes);
}
return sz;
}
static inline void
hs_cryptohash_sha512_hash (const uint8_t *data, size_t len, uint8_t *out)
{
struct sha512_ctx ctx;
hs_cryptohash_sha512_init(&ctx);
hs_cryptohash_sha512_update(&ctx, data, len);
hs_cryptohash_sha512t_finalize(&ctx, 512, out);
}
static inline void
hs_cryptohash_sha384_hash (const uint8_t *data, size_t len, uint8_t *out)
{
struct sha512_ctx ctx;
hs_cryptohash_sha384_init(&ctx);
hs_cryptohash_sha512_update(&ctx, data, len);
hs_cryptohash_sha512t_finalize(&ctx, 384, out);
}
static inline void
hs_cryptohash_sha512t_hash (const uint8_t *data, size_t len, uint8_t *out, const uint16_t outbits)
{
struct sha512_ctx ctx;
if (!(0 < outbits && outbits < 512)) return;
hs_cryptohash_sha512t_init(&ctx, outbits);
hs_cryptohash_sha512_update(&ctx, data, len);
hs_cryptohash_sha512t_finalize(&ctx, outbits, out);
}
#endif