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332 lines
11 KiB
C++
332 lines
11 KiB
C++
/*
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Implementation by the Keccak, Keyak and Ketje Teams, namely, Guido Bertoni,
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Joan Daemen, Michaël Peeters, Gilles Van Assche and Ronny Van Keer, hereby
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denoted as "the implementer".
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For more information, feedback or questions, please refer to our websites:
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http://keccak.noekeon.org/
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http://keyak.noekeon.org/
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http://ketje.noekeon.org/
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To the extent possible under law, the implementer has waived all copyright
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and related or neighboring rights to the source code in this file.
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http://creativecommons.org/publicdomain/zero/1.0/
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*/
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#define JOIN0(a, b) a ## b
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#define JOIN(a, b) JOIN0(a, b)
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#define Sponge JOIN(prefix, _Sponge)
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#define SpongeInstance JOIN(prefix, _SpongeInstance)
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#define SpongeInitialize JOIN(prefix, _SpongeInitialize)
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#define SpongeAbsorb JOIN(prefix, _SpongeAbsorb)
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#define SpongeAbsorbLastFewBits JOIN(prefix, _SpongeAbsorbLastFewBits)
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#define SpongeSqueeze JOIN(prefix, _SpongeSqueeze)
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#define SnP_stateSizeInBytes JOIN(SnP, _stateSizeInBytes)
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#define SnP_stateAlignment JOIN(SnP, _stateAlignment)
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#define SnP_StaticInitialize JOIN(SnP, _StaticInitialize)
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#define SnP_Initialize JOIN(SnP, _Initialize)
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#define SnP_AddByte JOIN(SnP, _AddByte)
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#define SnP_AddBytes JOIN(SnP, _AddBytes)
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#define SnP_ExtractBytes JOIN(SnP, _ExtractBytes)
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int Sponge(unsigned int rate, unsigned int capacity, const unsigned char *input, size_t inputByteLen, unsigned char suffix, unsigned char *output, size_t outputByteLen)
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{
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ALIGN(SnP_stateAlignment) unsigned char state[SnP_stateSizeInBytes];
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unsigned int partialBlock;
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const unsigned char *curInput = input;
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unsigned char *curOutput = output;
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unsigned int rateInBytes = rate/8;
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if (rate+capacity != SnP_width)
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return 1;
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if ((rate <= 0) || (rate > SnP_width) || ((rate % 8) != 0))
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return 1;
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if (suffix == 0)
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return 1;
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/* Initialize the state */
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SnP_StaticInitialize();
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SnP_Initialize(state);
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/* First, absorb whole blocks */
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#ifdef SnP_FastLoop_Absorb
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if (((rateInBytes % (SnP_width/200)) == 0) && (inputByteLen >= rateInBytes)) {
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/* fast lane: whole lane rate */
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size_t j;
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j = SnP_FastLoop_Absorb(state, rateInBytes/(SnP_width/200), curInput, inputByteLen);
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curInput += j;
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inputByteLen -= j;
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}
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#endif
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while(inputByteLen >= (size_t)rateInBytes) {
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#ifdef KeccakReference
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displayBytes(1, "Block to be absorbed", curInput, rateInBytes);
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#endif
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SnP_AddBytes(state, curInput, 0, rateInBytes);
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SnP_Permute(state);
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curInput += rateInBytes;
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inputByteLen -= rateInBytes;
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}
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/* Then, absorb what remains */
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partialBlock = (unsigned int)inputByteLen;
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#ifdef KeccakReference
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displayBytes(1, "Block to be absorbed (part)", curInput, partialBlock);
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#endif
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SnP_AddBytes(state, curInput, 0, partialBlock);
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/* Finally, absorb the suffix */
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#ifdef KeccakReference
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{
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unsigned char delimitedData1[1];
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delimitedData1[0] = suffix;
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displayBytes(1, "Block to be absorbed (last few bits + first bit of padding)", delimitedData1, 1);
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}
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#endif
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/* Last few bits, whose delimiter coincides with first bit of padding */
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SnP_AddByte(state, suffix, partialBlock);
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/* If the first bit of padding is at position rate-1, we need a whole new block for the second bit of padding */
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if ((suffix >= 0x80) && (partialBlock == (rateInBytes-1)))
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SnP_Permute(state);
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/* Second bit of padding */
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SnP_AddByte(state, 0x80, rateInBytes-1);
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#ifdef KeccakReference
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{
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unsigned char block[SnP_width/8];
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memset(block, 0, SnP_width/8);
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block[rateInBytes-1] = 0x80;
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displayBytes(1, "Second bit of padding", block, rateInBytes);
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}
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#endif
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SnP_Permute(state);
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#ifdef KeccakReference
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displayText(1, "--- Switching to squeezing phase ---");
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#endif
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/* First, output whole blocks */
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while(outputByteLen > (size_t)rateInBytes) {
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SnP_ExtractBytes(state, curOutput, 0, rateInBytes);
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SnP_Permute(state);
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#ifdef KeccakReference
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displayBytes(1, "Squeezed block", curOutput, rateInBytes);
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#endif
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curOutput += rateInBytes;
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outputByteLen -= rateInBytes;
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}
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/* Finally, output what remains */
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partialBlock = (unsigned int)outputByteLen;
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SnP_ExtractBytes(state, curOutput, 0, partialBlock);
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#ifdef KeccakReference
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displayBytes(1, "Squeezed block (part)", curOutput, partialBlock);
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#endif
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return 0;
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}
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/* ---------------------------------------------------------------- */
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/* ---------------------------------------------------------------- */
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/* ---------------------------------------------------------------- */
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int SpongeInitialize(SpongeInstance *instance, unsigned int rate, unsigned int capacity)
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{
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if (rate+capacity != SnP_width)
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return 1;
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if ((rate <= 0) || (rate > SnP_width) || ((rate % 8) != 0))
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return 1;
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SnP_StaticInitialize();
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SnP_Initialize(instance->state);
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instance->rate = rate;
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instance->byteIOIndex = 0;
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instance->squeezing = 0;
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return 0;
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}
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/* ---------------------------------------------------------------- */
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int SpongeAbsorb(SpongeInstance *instance, const unsigned char *data, size_t dataByteLen)
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{
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size_t i, j;
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unsigned int partialBlock;
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const unsigned char *curData;
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unsigned int rateInBytes = instance->rate/8;
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if (instance->squeezing)
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return 1; /* Too late for additional input */
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i = 0;
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curData = data;
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while(i < dataByteLen) {
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if ((instance->byteIOIndex == 0) && (dataByteLen >= (i + rateInBytes))) {
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#ifdef SnP_FastLoop_Absorb
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/* processing full blocks first */
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if ((rateInBytes % (SnP_width/200)) == 0) {
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/* fast lane: whole lane rate */
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j = SnP_FastLoop_Absorb(instance->state, rateInBytes/(SnP_width/200), curData, dataByteLen - i);
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i += j;
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curData += j;
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}
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else {
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#endif
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for(j=dataByteLen-i; j>=rateInBytes; j-=rateInBytes) {
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#ifdef KeccakReference
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displayBytes(1, "Block to be absorbed", curData, rateInBytes);
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#endif
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SnP_AddBytes(instance->state, curData, 0, rateInBytes);
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SnP_Permute(instance->state);
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curData+=rateInBytes;
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}
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i = dataByteLen - j;
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#ifdef SnP_FastLoop_Absorb
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}
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#endif
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}
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else {
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/* normal lane: using the message queue */
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partialBlock = (unsigned int)(dataByteLen - i);
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if (partialBlock+instance->byteIOIndex > rateInBytes)
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partialBlock = rateInBytes-instance->byteIOIndex;
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#ifdef KeccakReference
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displayBytes(1, "Block to be absorbed (part)", curData, partialBlock);
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#endif
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i += partialBlock;
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SnP_AddBytes(instance->state, curData, instance->byteIOIndex, partialBlock);
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curData += partialBlock;
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instance->byteIOIndex += partialBlock;
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if (instance->byteIOIndex == rateInBytes) {
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SnP_Permute(instance->state);
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instance->byteIOIndex = 0;
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}
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}
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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int SpongeAbsorbLastFewBits(SpongeInstance *instance, unsigned char delimitedData)
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{
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unsigned int rateInBytes = instance->rate/8;
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if (delimitedData == 0)
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return 1;
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if (instance->squeezing)
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return 1; /* Too late for additional input */
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#ifdef KeccakReference
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{
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unsigned char delimitedData1[1];
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delimitedData1[0] = delimitedData;
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displayBytes(1, "Block to be absorbed (last few bits + first bit of padding)", delimitedData1, 1);
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}
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#endif
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/* Last few bits, whose delimiter coincides with first bit of padding */
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SnP_AddByte(instance->state, delimitedData, instance->byteIOIndex);
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/* If the first bit of padding is at position rate-1, we need a whole new block for the second bit of padding */
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if ((delimitedData >= 0x80) && (instance->byteIOIndex == (rateInBytes-1)))
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SnP_Permute(instance->state);
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/* Second bit of padding */
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SnP_AddByte(instance->state, 0x80, rateInBytes-1);
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#ifdef KeccakReference
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{
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unsigned char block[SnP_width/8];
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memset(block, 0, SnP_width/8);
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block[rateInBytes-1] = 0x80;
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displayBytes(1, "Second bit of padding", block, rateInBytes);
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}
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#endif
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SnP_Permute(instance->state);
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instance->byteIOIndex = 0;
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instance->squeezing = 1;
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#ifdef KeccakReference
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displayText(1, "--- Switching to squeezing phase ---");
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#endif
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return 0;
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}
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/* ---------------------------------------------------------------- */
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int SpongeSqueeze(SpongeInstance *instance, unsigned char *data, size_t dataByteLen)
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{
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size_t i, j;
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unsigned int partialBlock;
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unsigned int rateInBytes = instance->rate/8;
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unsigned char *curData;
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if (!instance->squeezing)
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SpongeAbsorbLastFewBits(instance, 0x01);
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i = 0;
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curData = data;
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while(i < dataByteLen) {
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if ((instance->byteIOIndex == rateInBytes) && (dataByteLen >= (i + rateInBytes))) {
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for(j=dataByteLen-i; j>=rateInBytes; j-=rateInBytes) {
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SnP_Permute(instance->state);
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SnP_ExtractBytes(instance->state, curData, 0, rateInBytes);
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#ifdef KeccakReference
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displayBytes(1, "Squeezed block", curData, rateInBytes);
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#endif
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curData+=rateInBytes;
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}
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i = dataByteLen - j;
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}
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else {
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/* normal lane: using the message queue */
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if (instance->byteIOIndex == rateInBytes) {
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SnP_Permute(instance->state);
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instance->byteIOIndex = 0;
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}
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partialBlock = (unsigned int)(dataByteLen - i);
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if (partialBlock+instance->byteIOIndex > rateInBytes)
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partialBlock = rateInBytes-instance->byteIOIndex;
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i += partialBlock;
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SnP_ExtractBytes(instance->state, curData, instance->byteIOIndex, partialBlock);
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#ifdef KeccakReference
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displayBytes(1, "Squeezed block (part)", curData, partialBlock);
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#endif
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curData += partialBlock;
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instance->byteIOIndex += partialBlock;
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}
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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#undef Sponge
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#undef SpongeInstance
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#undef SpongeInitialize
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#undef SpongeAbsorb
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#undef SpongeAbsorbLastFewBits
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#undef SpongeSqueeze
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#undef SnP_stateSizeInBytes
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#undef SnP_stateAlignment
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#undef SnP_StaticInitialize
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#undef SnP_Initialize
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#undef SnP_AddByte
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#undef SnP_AddBytes
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#undef SnP_ExtractBytes
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