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#ifndef SHA3_H
#define SHA3_H
/* -------------------------------------------------------------------------
* Works when compiled for either 32-bit or 64-bit targets, optimized for
* 64 bit.
*
* Canonical implementation of Init/Update/Finalize for SHA-3 byte input.
*
* SHA3-256, SHA3-384, SHA-512 are implemented. SHA-224 can easily be added.
*
* Based on code from http://keccak.noekeon.org/ .
*
* I place the code that I wrote into public domain, free to use.
*
* I would appreciate if you give credits to this work if you used it to
* write or test * your code.
*
* Aug 2015. Andrey Jivsov. crypto@brainhub.org
* ---------------------------------------------------------------------- */
/* 'Words' here refers to uint64_t */
#define SHA3_KECCAK_SPONGE_WORDS \
(((1600)/8/*bits to byte*/)/sizeof(uint64_t))
typedef struct sha3_context_ {
uint64_t saved; /* the portion of the input message that we
* didn't consume yet */
union { /* Keccak's state */
uint64_t s[SHA3_KECCAK_SPONGE_WORDS];
uint8_t sb[SHA3_KECCAK_SPONGE_WORDS * 8];
};
unsigned byteIndex; /* 0..7--the next byte after the set one
* (starts from 0; 0--none are buffered) */
unsigned wordIndex; /* 0..24--the next word to integrate input
* (starts from 0) */
unsigned capacityWords; /* the double size of the hash output in
* words (e.g. 16 for Keccak 512) */
} sha3_context;
/* For Init or Reset call these: */
void sha3_Init256(void *priv);
void sha3_Init384(void *priv);
void sha3_Init512(void *priv);
void sha3_Update(void *priv, void const *bufIn, size_t len);
void const *sha3_Finalize(void *priv);
#endif
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