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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifdef SUPPORT_BLAKE256
LIBHASHSUM_1_NONNULL_
static size_t
process(struct libhashsum_hasher *this, const void *data, size_t bytes)
{
return libblake_blake256_update(&this->state.blake256.s, data, 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 = libblake_blake256_update(&this->state.blake256.s, data, bytes);
m = &m[r];
bytes -= r;
if (!this->hash_output)
this->hash_output = this->state.blake256.buf;
memcpy(this->state.blake256.buf, m, bytes + (size_t)(extra_bits > 0U));
if (extra_bits)
this->state.blake256.buf[bytes] = libhashsum_reverse_byte__(this->state.blake256.buf[bytes]);
libblake_blake256_digest(&this->state.blake256.s, this->state.blake256.buf, bytes,
extra_bits, NULL, this->hash_output);
memset(&this->state.blake256.s, 0, sizeof(this->state.blake256.s));
return 0;
}
LIBHASHSUM_1_NONNULL_
static int
finalise(struct libhashsum_hasher *this, void *data, size_t bytes, unsigned extra_bits, size_t size)
{
uint8_t *m = data;
size_t r;
if (extra_bits > 7U) {
errno = EINVAL;
return -1;
}
r = libblake_blake256_update(&this->state.blake256.s, data, bytes);
m = &m[r];
bytes -= r;
size -= r;
if (!this->hash_output)
this->hash_output = this->state.blake256.buf;
if (size < libblake_blake256_digest_get_required_input_size(bytes, extra_bits, NULL)) {
memcpy(this->state.blake256.buf, m, bytes + (size_t)(extra_bits > 0U));
m = this->state.blake256.buf;
}
if (extra_bits)
m[bytes] = libhashsum_reverse_byte__(m[bytes]);
libblake_blake256_digest(&this->state.blake256.s, m, bytes, extra_bits, NULL, this->hash_output);
memset(&this->state.blake256.s, 0, sizeof(this->state.blake256.s));
return 0;
}
static const char *
mkalgostr(char *buf, const char *name, const uint8_t *salt)
{
char *p;
size_t i;
if (!salt)
return name;
for (i = 0; i < 16U; i++)
if (salt[i])
goto nonzero;
return name;
nonzero:
p = stpcpy(stpcpy(buf, name), "[salt=");
for (i = 0; i < 16U; i++) {
*p++ = "0123456789abcdef"[(salt[i] >> 4) & 15];
*p++ = "0123456789abcdef"[(salt[i] >> 0) & 15];
}
*p++ = ']';
*p++ = '\0';
return buf;
}
int
libhashsum_init_blake256_hasher(struct libhashsum_hasher *this, const void *salt)
{
libblake_init();
this->algorithm = LIBHASHSUM_BLAKE256;
this->algorithm_string = mkalgostr(this->state.blake256.algostr, "BLAKE256", salt);
this->input_block_size = 64U;
this->hash_size = LIBHASHSUM_BLAKE256_HASH_SIZE;
this->hash_output = NULL;
this->supports_non_whole_bytes = 1;
this->standard_partial_byte_input_encoding = LIBHASHSUM_MOST_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;
libblake_blake256_init2(&this->state.blake256.s, salt);
return 0;
}
#else
int
libhashsum_init_blake256_hasher(struct libhashsum_hasher *this, const void *salt)
{
(void) this;
(void) salt;
errno = ENOSYS;
return -1;
}
#endif
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