/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.] */

#ifndef OPENSSL_HEADER_SHA_H
#define OPENSSL_HEADER_SHA_H

#include <openssl/base.h>

#if defined(__cplusplus)
extern "C" {
#endif


/* The SHA family of hash functions (SHA-1 and SHA-2). */


/* SHA_CBLOCK is the block size of SHA-1. */
#define SHA_CBLOCK 64

/* SHA_DIGEST_LENGTH is the length of a SHA-1 digest. */
#define SHA_DIGEST_LENGTH 20

/* TODO(fork): remove */
#define SHA_LBLOCK 16
#define SHA_LONG uint32_t

/* SHA1_Init initialises |sha| and returns one. */
OPENSSL_EXPORT int SHA1_Init(SHA_CTX *sha);

/* SHA1_Update adds |len| bytes from |data| to |sha| and returns one. */
OPENSSL_EXPORT int SHA1_Update(SHA_CTX *sha, const void *data, size_t len);

/* SHA1_Final adds the final padding to |sha| and writes the resulting digest
 * to |md|, which must have at least |SHA_DIGEST_LENGTH| bytes of space. It
 * returns one. */
OPENSSL_EXPORT int SHA1_Final(uint8_t *md, SHA_CTX *sha);

/* SHA1 writes the digest of |len| bytes from |data| to |out| and returns
 * |out|. There must be at least |SHA_DIGEST_LENGTH| bytes of space in
 * |out|. */
OPENSSL_EXPORT uint8_t *SHA1(const uint8_t *data, size_t len, uint8_t *out);

/* SHA1_Transform is a low-level function that performs a single, SHA-1 block
 * transformation using the state from |sha| and 64 bytes from |block|. */
OPENSSL_EXPORT void SHA1_Transform(SHA_CTX *sha, const uint8_t *block);

struct sha_state_st {
  uint32_t h0, h1, h2, h3, h4;
  uint32_t Nl, Nh;
  uint32_t data[16];
  unsigned int num;
};


/* SHA-224. */

/* SHA224_CBLOCK is the block size of SHA-224. */
#define SHA224_CBLOCK 64

/* SHA224_DIGEST_LENGTH is the length of a SHA-224 digest. */
#define SHA224_DIGEST_LENGTH 28

/* SHA224_Init initialises |sha| and returns 1. */
OPENSSL_EXPORT int SHA224_Init(SHA256_CTX *sha);

/* SHA224_Update adds |len| bytes from |data| to |sha| and returns 1. */
OPENSSL_EXPORT int SHA224_Update(SHA256_CTX *sha, const void *data, size_t len);

/* SHA224_Final adds the final padding to |sha| and writes the resulting digest
 * to |md|, which must have at least |SHA224_DIGEST_LENGTH| bytes of space. It
 * returns one on success and zero on programmer error. */
OPENSSL_EXPORT int SHA224_Final(uint8_t *md, SHA256_CTX *sha);

/* SHA224 writes the digest of |len| bytes from |data| to |out| and returns
 * |out|. There must be at least |SHA224_DIGEST_LENGTH| bytes of space in
 * |out|. */
OPENSSL_EXPORT uint8_t *SHA224(const uint8_t *data, size_t len, uint8_t *out);


/* SHA-256. */

/* SHA256_CBLOCK is the block size of SHA-256. */
#define SHA256_CBLOCK 64

/* SHA256_DIGEST_LENGTH is the length of a SHA-256 digest. */
#define SHA256_DIGEST_LENGTH 32

/* SHA256_Init initialises |sha| and returns 1. */
OPENSSL_EXPORT int SHA256_Init(SHA256_CTX *sha);

/* SHA256_Update adds |len| bytes from |data| to |sha| and returns 1. */
OPENSSL_EXPORT int SHA256_Update(SHA256_CTX *sha, const void *data, size_t len);

/* SHA256_Final adds the final padding to |sha| and writes the resulting digest
 * to |md|, which must have at least |SHA256_DIGEST_LENGTH| bytes of space. It
 * returns one on success and zero on programmer error. */
OPENSSL_EXPORT int SHA256_Final(uint8_t *md, SHA256_CTX *sha);

/* SHA256 writes the digest of |len| bytes from |data| to |out| and returns
 * |out|. There must be at least |SHA256_DIGEST_LENGTH| bytes of space in
 * |out|. */
OPENSSL_EXPORT uint8_t *SHA256(const uint8_t *data, size_t len, uint8_t *out);

/* SHA256_Transform is a low-level function that performs a single, SHA-1 block
 * transformation using the state from |sha| and 64 bytes from |block|. */
OPENSSL_EXPORT void SHA256_Transform(SHA256_CTX *sha, const uint8_t *data);

struct sha256_state_st {
  uint32_t h[8];
  uint32_t Nl, Nh;
  uint32_t data[16];
  unsigned int num, md_len;
};


/* SHA-384. */

/* SHA384_CBLOCK is the block size of SHA-384. */
#define SHA384_CBLOCK 128

/* SHA384_DIGEST_LENGTH is the length of a SHA-384 digest. */
#define SHA384_DIGEST_LENGTH 48

/* SHA384_Init initialises |sha| and returns 1. */
OPENSSL_EXPORT int SHA384_Init(SHA512_CTX *sha);

/* SHA384_Update adds |len| bytes from |data| to |sha| and returns 1. */
OPENSSL_EXPORT int SHA384_Update(SHA512_CTX *sha, const void *data, size_t len);

/* SHA384_Final adds the final padding to |sha| and writes the resulting digest
 * to |md|, which must have at least |SHA384_DIGEST_LENGTH| bytes of space. It
 * returns one on success and zero on programmer error. */
OPENSSL_EXPORT int SHA384_Final(uint8_t *md, SHA512_CTX *sha);

/* SHA384 writes the digest of |len| bytes from |data| to |out| and returns
 * |out|. There must be at least |SHA384_DIGEST_LENGTH| bytes of space in
 * |out|. */
OPENSSL_EXPORT uint8_t *SHA384(const uint8_t *data, size_t len, uint8_t *out);

/* SHA384_Transform is a low-level function that performs a single, SHA-1 block
 * transformation using the state from |sha| and 64 bytes from |block|. */
OPENSSL_EXPORT void SHA384_Transform(SHA512_CTX *sha, const uint8_t *data);


/* SHA-512. */

/* SHA512_CBLOCK is the block size of SHA-512. */
#define SHA512_CBLOCK 128

/* SHA512_DIGEST_LENGTH is the length of a SHA-512 digest. */
#define SHA512_DIGEST_LENGTH 64

/* SHA512_Init initialises |sha| and returns 1. */
OPENSSL_EXPORT int SHA512_Init(SHA512_CTX *sha);

/* SHA512_Update adds |len| bytes from |data| to |sha| and returns 1. */
OPENSSL_EXPORT int SHA512_Update(SHA512_CTX *sha, const void *data, size_t len);

/* SHA512_Final adds the final padding to |sha| and writes the resulting digest
 * to |md|, which must have at least |SHA512_DIGEST_LENGTH| bytes of space. It
 * returns one on success and zero on programmer error. */
OPENSSL_EXPORT int SHA512_Final(uint8_t *md, SHA512_CTX *sha);

/* SHA512 writes the digest of |len| bytes from |data| to |out| and returns
 * |out|. There must be at least |SHA512_DIGEST_LENGTH| bytes of space in
 * |out|. */
OPENSSL_EXPORT uint8_t *SHA512(const uint8_t *data, size_t len, uint8_t *out);

/* SHA512_Transform is a low-level function that performs a single, SHA-1 block
 * transformation using the state from |sha| and 64 bytes from |block|. */
OPENSSL_EXPORT void SHA512_Transform(SHA512_CTX *sha, const uint8_t *data);

struct sha512_state_st {
  uint64_t h[8];
  uint64_t Nl, Nh;
  union {
    uint64_t d[16];
    uint8_t p[128];
  } u;
  unsigned int num, md_len;
};


#if defined(__cplusplus)
}  /* extern C */
#endif

#endif  /* OPENSSL_HEADER_SHA_H */
