HashReturn Init(hashState *state, int hashbitlen)
{
KeccakInitialize();
switch(hashbitlen) {
case 0: // Arbitrary length output
state->capacity = 576;
break;
case 224:
state->capacity = 448;
break;
case 256:
state->capacity = 512;
break;
case 384:
state->capacity = 768;
break;
case 512:
state->capacity = 1024;
break;
default:
return BAD_HASHLEN;
}
state->rate = KeccakPermutationSize - state->capacity;
state->diversifier = hashbitlen/8;
state->hashbitlen = hashbitlen;
KeccakInitializeState(state->state);
memset(state->dataQueue, 0, KeccakMaximumRateInBytes);
state->bitsInQueue = 0;
state->squeezing = 0;
state->bitsAvailableForSqueezing = 0;
return SUCCESS;
}
int InitDuplex(duplexState *state, unsigned int rate, unsigned int capacity)
{
if (rate+capacity != 1600)
return 1;
if ((rate <= 0) || (rate > 1600))
return 1;
KeccakInitialize();
state->rate = rate;
state->capacity = capacity;
state->rho_max = rate-2;
KeccakInitializeState(state->state);
return 0;
}
static int InitSponge(spongeState *state, unsigned int rate, unsigned int capacity)
{
if (rate+capacity != 1600)
return 1;
if ((rate <= 0) || (rate >= 1600) || ((rate % 64) != 0))
return 1;
KeccakInitialize();
state->rate = rate;
state->capacity = capacity;
state->fixedOutputLength = 0;
KeccakInitializeState(state->state);
memset(state->dataQueue, 0, KeccakMaximumRateInBytes);
state->bitsInQueue = 0;
state->squeezing = 0;
state->bitsAvailableForSqueezing = 0;
return 0;
}
HashReturn InitEx(hashState *state, unsigned int rate, unsigned int capacity, unsigned char diversifier)
{
if (rate+capacity != 1600)
return BAD_HASHLEN;
if ((rate <= 0) || (rate >= 1600) || ((rate % 64) != 0))
return BAD_HASHLEN;
KeccakInitialize();
state->rate = rate;
state->capacity = capacity;
state->diversifier = diversifier;
state->hashbitlen = 0;
KeccakInitializeState(state->state);
memset(state->dataQueue, 0, KeccakMaximumRateInBytes);
state->bitsInQueue = 0;
state->squeezing = 0;
state->bitsAvailableForSqueezing = 0;
return SUCCESS;
}
