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/* See LICENSE file for copyright and license details. */
#include "common.h"
/**
* Initialise a state according to hashing specifications
*
* @param state The state that should be initialised
* @param spec The specifications for the state
* @return Zero on success, -1 on error
*/
int
libkeccak_state_initialise(struct libkeccak_state *restrict state, const struct libkeccak_spec *restrict spec)
{
long int x;
state->r = spec->bitrate;
state->n = spec->output;
state->c = spec->capacity;
state->b = state->r + state->c;
state->w = x = state->b / 25;
state->l = 0;
if (x & 0xF0L) {
state->l |= 4;
x >>= 4;
}
if (x & 0x0CL) {
state->l |= 2;
x >>= 2;
}
if (x & 0x02L) {
state->l |= 1;
}
state->nr = 12 + (state->l << 1);
state->wmod = (state->w == 64) ? ~0ULL : (uint64_t)((1ULL << state->w) - 1);
for (x = 0; x < 25; x++)
state->S.w64[x] = 0;
state->mptr = 0;
state->mlen = (size_t)(state->r * state->b) >> 2;
state->M = malloc(state->mlen * sizeof(char));
return state->M == NULL ? -1 : 0;
}
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