mirror of https://github.com/python/cpython
83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
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/*
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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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#include <string.h>
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#include "KeccakHash.h"
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/* ---------------------------------------------------------------- */
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HashReturn Keccak_HashInitialize(Keccak_HashInstance *instance, unsigned int rate, unsigned int capacity, unsigned int hashbitlen, unsigned char delimitedSuffix)
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{
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HashReturn result;
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if (delimitedSuffix == 0)
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return FAIL;
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result = (HashReturn)KeccakWidth1600_SpongeInitialize(&instance->sponge, rate, capacity);
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if (result != SUCCESS)
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return result;
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instance->fixedOutputLength = hashbitlen;
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instance->delimitedSuffix = delimitedSuffix;
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return SUCCESS;
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}
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/* ---------------------------------------------------------------- */
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HashReturn Keccak_HashUpdate(Keccak_HashInstance *instance, const BitSequence *data, DataLength databitlen)
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{
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if ((databitlen % 8) == 0)
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return (HashReturn)KeccakWidth1600_SpongeAbsorb(&instance->sponge, data, databitlen/8);
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else {
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HashReturn ret = (HashReturn)KeccakWidth1600_SpongeAbsorb(&instance->sponge, data, databitlen/8);
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if (ret == SUCCESS) {
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/* The last partial byte is assumed to be aligned on the least significant bits */
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unsigned char lastByte = data[databitlen/8];
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/* Concatenate the last few bits provided here with those of the suffix */
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unsigned short delimitedLastBytes = (unsigned short)((unsigned short)lastByte | ((unsigned short)instance->delimitedSuffix << (databitlen % 8)));
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if ((delimitedLastBytes & 0xFF00) == 0x0000) {
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instance->delimitedSuffix = delimitedLastBytes & 0xFF;
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}
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else {
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unsigned char oneByte[1];
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oneByte[0] = delimitedLastBytes & 0xFF;
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ret = (HashReturn)KeccakWidth1600_SpongeAbsorb(&instance->sponge, oneByte, 1);
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instance->delimitedSuffix = (delimitedLastBytes >> 8) & 0xFF;
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}
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}
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return ret;
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}
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}
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/* ---------------------------------------------------------------- */
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HashReturn Keccak_HashFinal(Keccak_HashInstance *instance, BitSequence *hashval)
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{
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HashReturn ret = (HashReturn)KeccakWidth1600_SpongeAbsorbLastFewBits(&instance->sponge, instance->delimitedSuffix);
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if (ret == SUCCESS)
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return (HashReturn)KeccakWidth1600_SpongeSqueeze(&instance->sponge, hashval, instance->fixedOutputLength/8);
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else
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return ret;
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}
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/* ---------------------------------------------------------------- */
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HashReturn Keccak_HashSqueeze(Keccak_HashInstance *instance, BitSequence *data, DataLength databitlen)
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{
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if ((databitlen % 8) != 0)
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return FAIL;
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return (HashReturn)KeccakWidth1600_SpongeSqueeze(&instance->sponge, data, databitlen/8);
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}
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