diff options
Diffstat (limited to 'Modules/_sha3/keccak/KeccakSponge.c')
| -rw-r--r-- | Modules/_sha3/keccak/KeccakSponge.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/Modules/_sha3/keccak/KeccakSponge.c b/Modules/_sha3/keccak/KeccakSponge.c new file mode 100644 index 0000000..1ca6bf0 --- /dev/null +++ b/Modules/_sha3/keccak/KeccakSponge.c @@ -0,0 +1,266 @@ +/* +The Keccak sponge function, designed by Guido Bertoni, Joan Daemen, +Michaël Peeters and Gilles Van Assche. For more information, feedback or +questions, please refer to our website: http://keccak.noekeon.org/ + +Implementation by the designers, +hereby denoted as "the implementer". + +To the extent possible under law, the implementer has waived all copyright +and related or neighboring rights to the source code in this file. +http://creativecommons.org/publicdomain/zero/1.0/ +*/ + +#include <string.h> +#include "KeccakSponge.h" +#include "KeccakF-1600-interface.h" +#ifdef KeccakReference +#include "displayIntermediateValues.h" +#endif + +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; +} + +static void AbsorbQueue(spongeState *state) +{ + /* state->bitsInQueue is assumed to be equal to state->rate */ + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", state->dataQueue, state->rate/8); + #endif +#ifdef ProvideFast576 + if (state->rate == 576) + KeccakAbsorb576bits(state->state, state->dataQueue); + else +#endif +#ifdef ProvideFast832 + if (state->rate == 832) + KeccakAbsorb832bits(state->state, state->dataQueue); + else +#endif +#ifdef ProvideFast1024 + if (state->rate == 1024) + KeccakAbsorb1024bits(state->state, state->dataQueue); + else +#endif +#ifdef ProvideFast1088 + if (state->rate == 1088) + KeccakAbsorb1088bits(state->state, state->dataQueue); + else +#endif +#ifdef ProvideFast1152 + if (state->rate == 1152) + KeccakAbsorb1152bits(state->state, state->dataQueue); + else +#endif +#ifdef ProvideFast1344 + if (state->rate == 1344) + KeccakAbsorb1344bits(state->state, state->dataQueue); + else +#endif + KeccakAbsorb(state->state, state->dataQueue, state->rate/64); + state->bitsInQueue = 0; +} + +static int Absorb(spongeState *state, const unsigned char *data, unsigned long long databitlen) +{ + unsigned long long i, j, wholeBlocks; + unsigned int partialBlock, partialByte; + const unsigned char *curData; + + if ((state->bitsInQueue % 8) != 0) + return 1; /* Only the last call may contain a partial byte */ + if (state->squeezing) + return 1; /* Too late for additional input */ + + i = 0; + while(i < databitlen) { + if ((state->bitsInQueue == 0) && (databitlen >= state->rate) && (i <= (databitlen-state->rate))) { + wholeBlocks = (databitlen-i)/state->rate; + curData = data+i/8; +#ifdef ProvideFast576 + if (state->rate == 576) { + for(j=0; j<wholeBlocks; j++, curData+=576/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb576bits(state->state, curData); + } + } + else +#endif +#ifdef ProvideFast832 + if (state->rate == 832) { + for(j=0; j<wholeBlocks; j++, curData+=832/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb832bits(state->state, curData); + } + } + else +#endif +#ifdef ProvideFast1024 + if (state->rate == 1024) { + for(j=0; j<wholeBlocks; j++, curData+=1024/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb1024bits(state->state, curData); + } + } + else +#endif +#ifdef ProvideFast1088 + if (state->rate == 1088) { + for(j=0; j<wholeBlocks; j++, curData+=1088/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb1088bits(state->state, curData); + } + } + else +#endif +#ifdef ProvideFast1152 + if (state->rate == 1152) { + for(j=0; j<wholeBlocks; j++, curData+=1152/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb1152bits(state->state, curData); + } + } + else +#endif +#ifdef ProvideFast1344 + if (state->rate == 1344) { + for(j=0; j<wholeBlocks; j++, curData+=1344/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb1344bits(state->state, curData); + } + } + else +#endif + { + for(j=0; j<wholeBlocks; j++, curData+=state->rate/8) { + #ifdef KeccakReference + displayBytes(1, "Block to be absorbed", curData, state->rate/8); + #endif + KeccakAbsorb(state->state, curData, state->rate/64); + } + } + i += wholeBlocks*state->rate; + } + else { + partialBlock = (unsigned int)(databitlen - i); + if (partialBlock+state->bitsInQueue > state->rate) + partialBlock = state->rate-state->bitsInQueue; + partialByte = partialBlock % 8; + partialBlock -= partialByte; + memcpy(state->dataQueue+state->bitsInQueue/8, data+i/8, partialBlock/8); + state->bitsInQueue += partialBlock; + i += partialBlock; + if (state->bitsInQueue == state->rate) + AbsorbQueue(state); + if (partialByte > 0) { + unsigned char mask = (1 << partialByte)-1; + state->dataQueue[state->bitsInQueue/8] = data[i/8] & mask; + state->bitsInQueue += partialByte; + i += partialByte; + } + } + } + return 0; +} + +static void PadAndSwitchToSqueezingPhase(spongeState *state) +{ + /* Note: the bits are numbered from 0=LSB to 7=MSB */ + if (state->bitsInQueue + 1 == state->rate) { + state->dataQueue[state->bitsInQueue/8 ] |= 1 << (state->bitsInQueue % 8); + AbsorbQueue(state); + memset(state->dataQueue, 0, state->rate/8); + } + else { + memset(state->dataQueue + (state->bitsInQueue+7)/8, 0, state->rate/8 - (state->bitsInQueue+7)/8); + state->dataQueue[state->bitsInQueue/8 ] |= 1 << (state->bitsInQueue % 8); + } + state->dataQueue[(state->rate-1)/8] |= 1 << ((state->rate-1) % 8); + AbsorbQueue(state); + + #ifdef KeccakReference + displayText(1, "--- Switching to squeezing phase ---"); + #endif +#ifdef ProvideFast1024 + if (state->rate == 1024) { + KeccakExtract1024bits(state->state, state->dataQueue); + state->bitsAvailableForSqueezing = 1024; + } + else +#endif + { + KeccakExtract(state->state, state->dataQueue, state->rate/64); + state->bitsAvailableForSqueezing = state->rate; + } + #ifdef KeccakReference + displayBytes(1, "Block available for squeezing", state->dataQueue, state->bitsAvailableForSqueezing/8); + #endif + state->squeezing = 1; +} + +static int Squeeze(spongeState *state, unsigned char *output, unsigned long long outputLength) +{ + unsigned long long i; + unsigned int partialBlock; + + if (!state->squeezing) + PadAndSwitchToSqueezingPhase(state); + if ((outputLength % 8) != 0) + return 1; /* Only multiple of 8 bits are allowed, truncation can be done at user level */ + + i = 0; + while(i < outputLength) { + if (state->bitsAvailableForSqueezing == 0) { + KeccakPermutation(state->state); +#ifdef ProvideFast1024 + if (state->rate == 1024) { + KeccakExtract1024bits(state->state, state->dataQueue); + state->bitsAvailableForSqueezing = 1024; + } + else +#endif + { + KeccakExtract(state->state, state->dataQueue, state->rate/64); + state->bitsAvailableForSqueezing = state->rate; + } + #ifdef KeccakReference + displayBytes(1, "Block available for squeezing", state->dataQueue, state->bitsAvailableForSqueezing/8); + #endif + } + partialBlock = state->bitsAvailableForSqueezing; + if ((unsigned long long)partialBlock > outputLength - i) + partialBlock = (unsigned int)(outputLength - i); + memcpy(output+i/8, state->dataQueue+(state->rate-state->bitsAvailableForSqueezing)/8, partialBlock/8); + state->bitsAvailableForSqueezing -= partialBlock; + i += partialBlock; + } + return 0; +} |