lilcrypto/hash_sha224_sha256.c

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/*
* Copyright (c) 2024 Lucas Gabriel Vuotto <lucas@lgv5.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "internal.h"
#include "util.h"
/*
* SHA-224 and SHA-256 implementations.
*
* This implementation doesn't support arbitrary amounts of bits, but only full
* bytes sizes. In particular, size is stored in bytes until the length has to
* be appended to the input. This is done to simplify overflow checks for input
* length.
*/
#define SHA256_SZ_MAX UINT32_C(0x1fffffff) /* 2^29 - 1 */
#define SHA224_H0_0 UINT32_C(0xc1059ed8)
#define SHA224_H0_1 UINT32_C(0x367cd507)
#define SHA224_H0_2 UINT32_C(0x3070dd17)
#define SHA224_H0_3 UINT32_C(0xf70e5939)
#define SHA224_H0_4 UINT32_C(0xffc00b31)
#define SHA224_H0_5 UINT32_C(0x68581511)
#define SHA224_H0_6 UINT32_C(0x64f98fa7)
#define SHA224_H0_7 UINT32_C(0xbefa4fa4)
#define SHA256_H0_0 UINT32_C(0x6a09e667)
#define SHA256_H0_1 UINT32_C(0xbb67ae85)
#define SHA256_H0_2 UINT32_C(0x3c6ef372)
#define SHA256_H0_3 UINT32_C(0xa54ff53a)
#define SHA256_H0_4 UINT32_C(0x510e527f)
#define SHA256_H0_5 UINT32_C(0x9b05688c)
#define SHA256_H0_6 UINT32_C(0x1f83d9ab)
#define SHA256_H0_7 UINT32_C(0x5be0cd19)
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static int
sha224_init(void *arg)
{
struct sha256_state *state = arg;
size_t i;
state->h0 = SHA224_H0_0;
state->h1 = SHA224_H0_1;
state->h2 = SHA224_H0_2;
state->h3 = SHA224_H0_3;
state->h4 = SHA224_H0_4;
state->h5 = SHA224_H0_5;
state->h6 = SHA224_H0_6;
state->h7 = SHA224_H0_7;
state->sz = 0;
state->blen = 0;
for (i = 0; i < LC_SHA256_BLOCKLEN; i++)
state->b[i] = 0;
return 1;
}
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static int
sha256_init(void *arg)
{
struct sha256_state *state = arg;
size_t i;
state->h0 = SHA256_H0_0;
state->h1 = SHA256_H0_1;
state->h2 = SHA256_H0_2;
state->h3 = SHA256_H0_3;
state->h4 = SHA256_H0_4;
state->h5 = SHA256_H0_5;
state->h6 = SHA256_H0_6;
state->h7 = SHA256_H0_7;
state->sz = 0;
state->blen = 0;
for (i = 0; i < LC_SHA256_BLOCKLEN; i++)
state->b[i] = 0;
return 1;
}
static int
sha224_sha256_update(void *arg, const uint8_t *in, size_t inlen)
{
struct sha256_state *state = arg;
size_t i;
if (inlen > SHA256_SZ_MAX - state->sz)
return 0;
state->sz += inlen;
for (i = 0; i + state->blen < LC_SHA256_BLOCKLEN && i < inlen; i++)
state->b[i + state->blen] = in[i];
state->blen += i;
in += i;
inlen -= i;
if (state->blen == LC_SHA256_BLOCKLEN) {
sha256_block(state);
state->blen = 0;
}
if (inlen == 0)
return 1;
while (inlen >= LC_SHA256_BLOCKLEN) {
for (i = 0; i < LC_SHA256_BLOCKLEN; i++)
state->b[i] = in[i];
in += i;
inlen -= i;
sha256_block(state);
}
for (i = 0; i < inlen; i++)
state->b[i] = in[i];
state->blen = inlen;
return 1;
}
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static int
sha224_update(void *arg, const uint8_t *in, size_t inlen)
{
return sha224_sha256_update(arg, in, inlen);
}
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static int
sha256_update(void *arg, const uint8_t *in, size_t inlen)
{
return sha224_sha256_update(arg, in, inlen);
}
static void
sha224_sha256_final(struct sha256_state *state)
{
size_t i, mlen;
mlen = state->blen;
state->b[mlen++] = 0x80;
if (mlen >= LC_SHA256_BLOCKLEN - sizeof(uint64_t)) {
for (i = mlen; i < LC_SHA256_BLOCKLEN; i++)
state->b[i] = 0;
sha256_block(state);
mlen = 0;
}
for (i = mlen; i < LC_SHA256_BLOCKLEN - sizeof(uint64_t); i++)
state->b[i] = 0;
store64be(&state->b[i], state->sz << 3);
sha256_block(state);
}
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static int
sha224_final(void *arg, uint8_t *out, size_t *outlen)
{
struct sha256_state *state = arg;
*outlen = LC_SHA224_HASHLEN;
if (out == NULL)
return 1;
sha224_sha256_final(state);
store32be(out, state->h0);
store32be(out + 4, state->h1);
store32be(out + 8, state->h2);
store32be(out + 12, state->h3);
store32be(out + 16, state->h4);
store32be(out + 20, state->h5);
store32be(out + 24, state->h6);
lc_scrub(state, sizeof(*state));
return 1;
}
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static int
sha256_final(void *arg, uint8_t *out, size_t *outlen)
{
struct sha256_state *state = arg;
*outlen = LC_SHA256_HASHLEN;
if (out == NULL)
return 1;
sha224_sha256_final(state);
store32be(out, state->h0);
store32be(out + 4, state->h1);
store32be(out + 8, state->h2);
store32be(out + 12, state->h3);
store32be(out + 16, state->h4);
store32be(out + 20, state->h5);
store32be(out + 24, state->h6);
store32be(out + 28, state->h7);
lc_scrub(state, sizeof(*state));
return 1;
}
static int
sha224_hash(uint8_t *out, size_t *outlen, const uint8_t *in, size_t inlen)
{
struct sha256_state state;
if (out == NULL) {
*outlen = LC_SHA224_HASHLEN;
return 1;
}
return sha224_init(&state) &&
sha224_update(&state, in, inlen) &&
sha224_final(&state, out, outlen);
}
static int
sha256_hash(uint8_t *out, size_t *outlen, const uint8_t *in, size_t inlen)
{
struct sha256_state state;
if (out == NULL) {
*outlen = LC_SHA256_HASHLEN;
return 1;
}
return sha256_init(&state) &&
sha256_update(&state, in, inlen) &&
sha256_final(&state, out, outlen);
}
const struct lc_hash_impl *
lc_hash_impl_sha224(void)
{
static struct lc_hash_impl sha224_impl = {
.init = &sha224_init,
.update = &sha224_update,
.final = &sha224_final,
.hash = &sha224_hash,
.argsz = sizeof(struct sha256_state),
.blocklen = LC_SHA224_BLOCKLEN,
.hashlen = LC_SHA224_HASHLEN,
};
return &sha224_impl;
}
const struct lc_hash_impl *
lc_hash_impl_sha256(void)
{
static struct lc_hash_impl sha256_impl = {
.init = &sha256_init,
.update = &sha256_update,
.final = &sha256_final,
.hash = &sha256_hash,
.argsz = sizeof(struct sha256_state),
.blocklen = LC_SHA256_BLOCKLEN,
.hashlen = LC_SHA256_HASHLEN,
};
return &sha256_impl;
}