pqc/common/fips202.h

#ifndef FIPS202_H
#define FIPS202_H

#include <stddef.h>
#include <stdint.h>

#define SHAKE128_RATE 168
#define SHAKE256_RATE 136
#define SHA3_256_RATE 136
#define SHA3_512_RATE 72


// Context for incremental API
typedef struct {
    uint64_t ctx[26];
} shake128incctx;

// Context for non-incremental API
typedef struct {
    uint64_t ctx[25];
} shake128ctx;

// Context for incremental API
typedef struct {
    uint64_t ctx[26];
} shake256incctx;

// Context for non-incremental API
typedef struct {
    uint64_t ctx[25];
} shake256ctx;

// Context for incremental API
typedef struct {
    uint64_t ctx[26];
} sha3_256incctx;

// Context for incremental API
typedef struct {
    uint64_t ctx[26];
} sha3_512incctx;

void shake128_absorb(shake128ctx *state, const uint8_t *input, size_t inlen);

void shake128_squeezeblocks(uint8_t *output, size_t nblocks, shake128ctx *state);

void shake128_inc_init(shake128incctx *state);
void shake128_inc_absorb(shake128incctx *state, const uint8_t *input, size_t inlen);
void shake128_inc_finalize(shake128incctx *state);
void shake128_inc_squeeze(uint8_t *output, size_t outlen, shake128incctx *state);

void shake256_absorb(shake256ctx *state, const uint8_t *input, size_t inlen);
void shake256_squeezeblocks(uint8_t *output, size_t nblocks, shake256ctx *state);

void shake256_inc_init(shake256incctx *state);
void shake256_inc_absorb(shake256incctx *state, const uint8_t *input, size_t inlen);
void shake256_inc_finalize(shake256incctx *state);
void shake256_inc_squeeze(uint8_t *output, size_t outlen, shake256incctx *state);

void shake128(uint8_t *output, size_t outlen,
              const uint8_t *input, size_t inlen);

void shake256(uint8_t *output, size_t outlen,
              const uint8_t *input, size_t inlen);

void sha3_256_inc_init(sha3_256incctx *state);
void sha3_256_inc_absorb(sha3_256incctx *state, const uint8_t *input, size_t inlen);
void sha3_256_inc_finalize(uint8_t *output, sha3_256incctx *state);

void sha3_256(uint8_t *output, const uint8_t *input, size_t inlen);

void sha3_512_inc_init(sha3_512incctx *state);
void sha3_512_inc_absorb(sha3_512incctx *state, const uint8_t *input, size_t inlen);
void sha3_512_inc_finalize(uint8_t *output, sha3_512incctx *state);

void sha3_512(uint8_t *output, const uint8_t *input, size_t inlen);

#endif