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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifdef SUPPORT_KECCAK
int
libhashsum_init_keccak_hasher(struct libhashsum_hasher *this, size_t ratebits, size_t capbits, size_t hashbits)
{
struct libkeccak_generalised_spec gspec;
struct libkeccak_spec spec;
if ((ratebits | capbits | hashbits) > (size_t)LONG_MAX) {
errno = EINVAL;
return -1;
} else if (!ratebits || !capbits || !hashbits) {
libkeccak_generalised_spec_initialise(&gspec);
if (ratebits)
gspec.bitrate = (long int)ratebits;
if (capbits)
gspec.capacity = (long int)capbits;
if (hashbits)
gspec.output = (long int)hashbits;
if (libkeccak_degeneralise_spec(&gspec, &spec)) {
errno = EINVAL;
return -1;
}
ratebits = (size_t)spec.bitrate;
capbits = (size_t)spec.capacity;
hashbits = (size_t)spec.output;
} else {
spec.bitrate = (long int)ratebits;
spec.capacity = (long int)capbits;
spec.output = (long int)hashbits;
}
if (libkeccak_spec_check(&spec)) {
errno = EINVAL;
return -1;
}
this->algorithm = LIBHASHSUM_KECCAK;
if ((capbits >> 1) == hashbits && !(capbits & 1U) &&
1600U >= capbits && ratebits == 1600U - capbits) {
if (hashbits == 224U) {
this->algorithm = LIBHASHSUM_KECCAK_224;
this->algorithm_string = "Keccak-224";
} else if (hashbits == 256U) {
this->algorithm = LIBHASHSUM_KECCAK_256;
this->algorithm_string = "Keccak-256";
} else if (hashbits == 384U) {
this->algorithm = LIBHASHSUM_KECCAK_384;
this->algorithm_string = "Keccak-384";
} else if (hashbits == 512U) {
this->algorithm = LIBHASHSUM_KECCAK_512;
this->algorithm_string = "Keccak-512";
}
}
if (this->algorithm == LIBHASHSUM_KECCAK) {
sprintf(this->state.keccak.algostr, "Keccak[r=%zu,c=%zu,n=%zu]", ratebits, capbits, hashbits);
this->algorithm_string = this->state.keccak.algostr;
}
return libhashsum_init_keccak__(this, hashbits, &spec, "");
}
#else
int
libhashsum_init_keccak_hasher(struct libhashsum_hasher *this, size_t hashbits)
{
(void) this;
(void) hashbits;
errno = ENOSYS;
return -1;
}
#endif
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