77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
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/*
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The Keccak sponge function, designed by Guido Bertoni, Joan Daemen,
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Michaël Peeters and Gilles Van Assche. For more information, feedback or
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questions, please refer to our website: http://keccak.noekeon.org/
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Implementation by the designers,
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hereby denoted as "the implementer".
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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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#ifndef _KeccakSponge_h_
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#define _KeccakSponge_h_
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#define KeccakPermutationSize 1600
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#define KeccakPermutationSizeInBytes (KeccakPermutationSize/8)
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#define KeccakMaximumRate 1536
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#define KeccakMaximumRateInBytes (KeccakMaximumRate/8)
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#if defined(__GNUC__)
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#define ALIGN __attribute__ ((aligned(32)))
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#elif defined(_MSC_VER)
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#define ALIGN __declspec(align(32))
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#else
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#define ALIGN
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#endif
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ALIGN typedef struct spongeStateStruct {
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ALIGN unsigned char state[KeccakPermutationSizeInBytes];
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ALIGN unsigned char dataQueue[KeccakMaximumRateInBytes];
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unsigned int rate;
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unsigned int capacity;
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unsigned int bitsInQueue;
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unsigned int fixedOutputLength;
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int squeezing;
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unsigned int bitsAvailableForSqueezing;
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} spongeState;
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/**
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* Function to initialize the state of the Keccak[r, c] sponge function.
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* The sponge function is set to the absorbing phase.
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* @param state Pointer to the state of the sponge function to be initialized.
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* @param rate The value of the rate r.
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* @param capacity The value of the capacity c.
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* @pre One must have r+c=1600 and the rate a multiple of 64 bits in this implementation.
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* @return Zero if successful, 1 otherwise.
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*/
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int InitSponge(spongeState *state, unsigned int rate, unsigned int capacity);
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/**
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* Function to give input data for the sponge function to absorb.
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* @param state Pointer to the state of the sponge function initialized by InitSponge().
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* @param data Pointer to the input data.
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* When @a databitLen is not a multiple of 8, the last bits of data must be
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* in the least significant bits of the last byte.
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* @param databitLen The number of input bits provided in the input data.
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* @pre In the previous call to Absorb(), databitLen was a multiple of 8.
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* @pre The sponge function must be in the absorbing phase,
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* i.e., Squeeze() must not have been called before.
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* @return Zero if successful, 1 otherwise.
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*/
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int Absorb(spongeState *state, const unsigned char *data, unsigned long long databitlen);
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/**
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* Function to squeeze output data from the sponge function.
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* If the sponge function was in the absorbing phase, this function
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* switches it to the squeezing phase.
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* @param state Pointer to the state of the sponge function initialized by InitSponge().
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* @param output Pointer to the buffer where to store the output data.
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* @param outputLength The number of output bits desired.
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* It must be a multiple of 8.
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* @return Zero if successful, 1 otherwise.
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*/
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int Squeeze(spongeState *state, unsigned char *output, unsigned long long outputLength);
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#endif
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