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#ifndef KECCAK_FIPS202_H
#define KECCAK_FIPS202_H
#include <stddef.h>
#include "lib/cc/torint.h"
#define KECCAK_MAX_RATE 200
/* Calculate the rate (block size) from the security target. */
#define KECCAK_RATE(bits) (KECCAK_MAX_RATE - (bits / 4))
/* The internal structure of a FIPS202 hash/xof instance. Most callers
* should treat this as an opaque structure.
*/
typedef struct keccak_state {
uint8_t a[KECCAK_MAX_RATE];
size_t rate;
uint8_t delim;
uint8_t block[KECCAK_MAX_RATE];
size_t offset;
uint8_t finalized : 1;
} __attribute__((aligned(8))) keccak_state;
/* Initialize a Keccak instance suitable for SHA-3 hash functions. */
int keccak_digest_init(keccak_state *s, size_t bits);
/* Feed more data into the SHA-3 hash instance. */
int keccak_digest_update(keccak_state *s, const uint8_t *buf, size_t len);
/* Calculate the SHA-3 hash digest. The state is unmodified to support
* calculating multiple/rolling digests.
*/
int keccak_digest_sum(const keccak_state *s, uint8_t *out, size_t outlen);
/* Initialize a Keccak instance suitable for XOFs (SHAKE-128/256). */
int keccak_xof_init(keccak_state *s, size_t bits);
/* Absorb more data into the XOF. Must not be called after a squeeze call. */
int keccak_xof_absorb(keccak_state *s, const uint8_t *buf, size_t len);
/* Squeeze data out of the XOF. Must not attempt to absorb additional data,
* after a squeeze has been called.
*/
int keccak_xof_squeeze(keccak_state *s, uint8_t *out, size_t outlen);
/* Clone an existing hash/XOF instance. */
void keccak_clone(keccak_state *out, const keccak_state *in);
/* Cleanse sensitive data from a given hash instance. */
void keccak_cleanse(keccak_state *s);
#define decshake(bits) \
int shake##bits(uint8_t*, size_t, const uint8_t*, size_t);
#define decsha3(bits) \
int sha3_##bits(uint8_t*, size_t, const uint8_t*, size_t);
decshake(128)
decshake(256)
decsha3(224)
decsha3(256)
decsha3(384)
decsha3(512)
#endif
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