70 lines
3.4 KiB
C
70 lines
3.4 KiB
C
/*
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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 _KeccakNISTInterface_h_
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#define _KeccakNISTInterface_h_
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#include "KeccakSponge.h"
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typedef unsigned char BitSequence;
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typedef unsigned long long DataLength;
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typedef enum { SUCCESS = 0, FAIL = 1, BAD_HASHLEN = 2 } HashReturn;
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typedef spongeState hashState;
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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 rate r and capacity c values are determined from @a hashbitlen.
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* @param state Pointer to the state of the sponge function to be initialized.
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* @param hashbitlen The desired number of output bits,
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* or 0 for Keccak[] with default parameters
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* and arbitrarily-long output.
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* @pre The value of hashbitlen must be one of 0, 224, 256, 384 and 512.
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* @return SUCCESS if successful, BAD_HASHLEN if the value of hashbitlen is incorrect.
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*/
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HashReturn Init(hashState *state, int hashbitlen);
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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 Init().
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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 most 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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* @return SUCCESS if successful, FAIL otherwise.
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*/
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HashReturn Update(hashState *state, const BitSequence *data, DataLength databitlen);
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/**
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* Function to squeeze output data from the sponge function.
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* If @a hashbitlen was not 0 in the call to Init(), the number of output bits is equal to @a hashbitlen.
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* If @a hashbitlen was 0 in the call to Init(), the output bits must be extracted using the Squeeze() function.
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* @param state Pointer to the state of the sponge function initialized by Init().
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* @param hashval Pointer to the buffer where to store the output data.
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* @return SUCCESS if successful, FAIL otherwise.
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*/
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HashReturn Final(hashState *state, BitSequence *hashval);
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/**
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* Function to compute a hash using the Keccak[r, c] sponge function.
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* The rate r and capacity c values are determined from @a hashbitlen.
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* @param hashbitlen The desired number of output bits.
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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 most 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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* @param hashval Pointer to the buffer where to store the output data.
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* @pre The value of hashbitlen must be one of 224, 256, 384 and 512.
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* @return SUCCESS if successful, BAD_HASHLEN if the value of hashbitlen is incorrect.
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*/
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HashReturn Hash(int hashbitlen, const BitSequence *data, DataLength databitlen, BitSequence *hashval);
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#endif
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