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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifdef SUPPORT_SHA2
LIBHASHSUM_1_NONNULL_
static size_t
process(struct libhashsum_hasher *this, const void *data, size_t bytes)
{
const uint8_t *m = data;
int i;
bytes -= bytes & (this->input_block_size - 1U);
if (bytes > SIZE_MAX >> 3) {
for (i = 0; i < 8; i++) {
libsha2_update(&this->state.sha2.s, m, bytes);
m = &m[bytes >> 3];
}
} else if (bytes) {
libsha2_update(&this->state.sha2.s, m, bytes << 3);
}
return bytes;
}
LIBHASHSUM_1_NONNULL_
static int
finalise_const(struct libhashsum_hasher *this, const void *data, size_t bytes, unsigned extra_bits)
{
const uint8_t *m = data;
size_t r;
if (extra_bits > 7U) {
errno = EINVAL;
return -1;
}
r = process(this, m, bytes);
m = &m[r];
bytes -= r;
if (!this->hash_output)
this->hash_output = this->state.sha2.sum;
libsha2_digest(&this->state.sha2.s, data, (bytes << 3) | extra_bits, this->hash_output);
memset(&this->state.sha2.s, 0, sizeof(this->state.sha2.s));
return 0;
}
LIBHASHSUM_1_NONNULL_
static int
finalise(struct libhashsum_hasher *this, void *data, size_t bytes, unsigned extra_bits, size_t size)
{
(void) size;
return finalise_const(this, data, bytes, extra_bits);
}
int
libhashsum_init_sha2_hasher(struct libhashsum_hasher *this, unsigned algobits, size_t hashbits)
{
enum libsha2_algorithm algo;
if (algobits == 32U && hashbits == 224U) {
this->algorithm = LIBHASHSUM_SHA_224;
algo = LIBSHA2_224;
this->algorithm_string = "SHA-224";
} else if (algobits == 32U && hashbits == 256U) {
this->algorithm = LIBHASHSUM_SHA_256;
algo = LIBSHA2_256;
this->algorithm_string = "SHA-256";
} else if (algobits == 64U && hashbits == 384U) {
this->algorithm = LIBHASHSUM_SHA_384;
algo = LIBSHA2_384;
this->algorithm_string = "SHA-384";
} else if (algobits == 64U && hashbits == 512U) {
this->algorithm = LIBHASHSUM_SHA_512;
algo = LIBSHA2_512;
this->algorithm_string = "SHA-512";
} else if (algobits == 64U && hashbits == 224U) {
this->algorithm = LIBHASHSUM_SHA_512_224;
algo = LIBSHA2_512_224;
this->algorithm_string = "SHA-512/224";
} else if (algobits == 64U && hashbits == 256U) {
this->algorithm = LIBHASHSUM_SHA_512_256;
algo = LIBSHA2_512_256;
this->algorithm_string = "SHA-512/256";
} else {
errno = EINVAL;
return -1;
}
this->input_block_size = (size_t)algobits << 1;
this->hash_size = hashbits >> 3;
this->hash_output = NULL;
this->supports_non_whole_bytes = 1;
this->standard_partial_byte_input_encoding = LIBHASHSUM_LEAST_SIGNIFICANT;
this->standard_partial_byte_output_encoding = LIBHASHSUM_UNSUPPORTED;
this->hash_excess_bits = 0;
this->process = &process;
this->finalise_const = &finalise_const;
this->finalise = &finalise;
this->stretch = NULL;
this->destroy = NULL;
libsha2_init(&this->state.sha2.s, algo);
return 0;
}
#else
int
libhashsum_init_sha2_hasher(struct libhashsum_hasher *this, unsigned algobits, size_t hashbits)
{
(void) this;
(void) algobits;
(void) hashbits;
errno = ENOSYS;
return -1;
}
#endif
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