crypto_digest.h

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/* Copyright (c) 2001, Matej Pfajfar.
 * Copyright (c) 2001-2004, Roger Dingledine.
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#ifndef TOR_CRYPTO_DIGEST_H
#define TOR_CRYPTO_DIGEST_H

#include <stdio.h>

#include "container.h"
#include "torint.h"

#define DIGEST_LEN 20

#define DIGEST256_LEN 32

#define DIGEST512_LEN 64

#define BASE32_DIGEST_LEN 32

#define BASE64_DIGEST_LEN 27

#define BASE64_DIGEST256_LEN 43

#define BASE64_DIGEST512_LEN 86

#define HEX_DIGEST_LEN 40

#define HEX_DIGEST256_LEN 64

#define HEX_DIGEST512_LEN 128

typedef enum {
  DIGEST_SHA1 = 0,
  DIGEST_SHA256 = 1,
  DIGEST_SHA512 = 2,
  DIGEST_SHA3_256 = 3,
  DIGEST_SHA3_512 = 4,
} digest_algorithm_t;
#define  N_DIGEST_ALGORITHMS (DIGEST_SHA3_512+1)
#define  N_COMMON_DIGEST_ALGORITHMS (DIGEST_SHA256+1)

#define DIGEST_CHECKPOINT_BYTES (SIZEOF_VOID_P + 512)

typedef struct crypto_digest_checkpoint_t {
  uint8_t mem[DIGEST_CHECKPOINT_BYTES];
} crypto_digest_checkpoint_t;

typedef struct {
  char d[N_COMMON_DIGEST_ALGORITHMS][DIGEST256_LEN];
} common_digests_t;

typedef struct crypto_digest_t crypto_digest_t;
typedef struct crypto_xof_t crypto_xof_t;

/* SHA-1 and other digests */
int crypto_digest(char *digest, const char *m, size_t len);
int crypto_digest256(char *digest, const char *m, size_t len,
                     digest_algorithm_t algorithm);
int crypto_digest512(char *digest, const char *m, size_t len,
                     digest_algorithm_t algorithm);
int crypto_common_digests(common_digests_t *ds_out, const char *m, size_t len);
void crypto_digest_smartlist_prefix(char *digest_out, size_t len_out,
                                    const char *prepend,
                                    const struct smartlist_t *lst,
                                    const char *append,
                                    digest_algorithm_t alg);
void crypto_digest_smartlist(char *digest_out, size_t len_out,
                             const struct smartlist_t *lst, const char *append,
                             digest_algorithm_t alg);
const char *crypto_digest_algorithm_get_name(digest_algorithm_t alg);
size_t crypto_digest_algorithm_get_length(digest_algorithm_t alg);
int crypto_digest_algorithm_parse_name(const char *name);
crypto_digest_t *crypto_digest_new(void);
crypto_digest_t *crypto_digest256_new(digest_algorithm_t algorithm);
crypto_digest_t *crypto_digest512_new(digest_algorithm_t algorithm);
void crypto_digest_free_(crypto_digest_t *digest);
#define crypto_digest_free(d) \
  FREE_AND_NULL(crypto_digest_t, crypto_digest_free_, (d))
void crypto_digest_add_bytes(crypto_digest_t *digest, const char *data,
                             size_t len);
void crypto_digest_get_digest(crypto_digest_t *digest,
                              char *out, size_t out_len);
crypto_digest_t *crypto_digest_dup(const crypto_digest_t *digest);
void crypto_digest_checkpoint(crypto_digest_checkpoint_t *checkpoint,
                              const crypto_digest_t *digest);
void crypto_digest_restore(crypto_digest_t *digest,
                           const crypto_digest_checkpoint_t *checkpoint);
void crypto_digest_assign(crypto_digest_t *into,
                          const crypto_digest_t *from);
void crypto_hmac_sha256(char *hmac_out,
                        const char *key, size_t key_len,
                        const char *msg, size_t msg_len);
void crypto_mac_sha3_256(uint8_t *mac_out, size_t len_out,
                         const uint8_t *key, size_t key_len,
                         const uint8_t *msg, size_t msg_len);

/* xof functions*/
crypto_xof_t *crypto_xof_new(void);
void crypto_xof_add_bytes(crypto_xof_t *xof, const uint8_t *data, size_t len);
void crypto_xof_squeeze_bytes(crypto_xof_t *xof, uint8_t *out, size_t len);
void crypto_xof_free_(crypto_xof_t *xof);
#define crypto_xof_free(xof) \
  FREE_AND_NULL(crypto_xof_t, crypto_xof_free_, (xof))

#ifdef TOR_UNIT_TESTS
digest_algorithm_t crypto_digest_get_algorithm(crypto_digest_t *digest);
#endif

#endif /* !defined(TOR_CRYPTO_DIGEST_H) */