// /*
//  * FIPS 180-2 SHA-224/256/384/512 implementation
//  * Last update: 02/02/2007
//  * Issue date:  04/30/2005
//  *
//  * Copyright (C) 2005, 2007 Olivier Gay <olivier.gay@a3.epfl.ch>
//  * All rights reserved.
//  *
//  * 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 above 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. Neither the name of the project nor the names of its contributors
//  *    may be used to endorse or promote products derived from this software
//  *    without specific prior written permission.
//  *
//  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT 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.
//  */

// #ifndef SHA2_H
// #define SHA2_H

// #define SHA224_DIGEST_SIZE ( 224 / 8)
// #define SHA256_DIGEST_SIZE ( 256 / 8)
// #define SHA384_DIGEST_SIZE ( 384 / 8)
// #define SHA512_DIGEST_SIZE ( 512 / 8)

// #define SHA256_BLOCK_SIZE  ( 512 / 8)
// #define SHA512_BLOCK_SIZE  (1024 / 8)
// #define SHA384_BLOCK_SIZE  SHA512_BLOCK_SIZE
// #define SHA224_BLOCK_SIZE  SHA256_BLOCK_SIZE

// #ifndef SHA2_TYPES
// #define SHA2_TYPES
// typedef unsigned char uint8;
// typedef unsigned long uint32;
// typedef unsigned long long uint64;
// #endif

// #ifdef __cplusplus
// extern "C" {
// #endif

// typedef struct {
//     unsigned int tot_len;
//     unsigned int len;
//     unsigned char block[2 * SHA256_BLOCK_SIZE];
//     uint32 h[8];
// } sha256_ctx;

// typedef struct {
//     unsigned int tot_len;
//     unsigned int len;
//     unsigned char block[2 * SHA512_BLOCK_SIZE];
//     uint64 h[8];
// } sha512_ctx;

// typedef sha512_ctx sha384_ctx;
// typedef sha256_ctx sha224_ctx;

// void sha224_init(sha224_ctx *ctx);
// void sha224_update(sha224_ctx *ctx, const unsigned char *message,
//                    unsigned int len);
// void sha224_final(sha224_ctx *ctx, unsigned char *digest);
// void sha224(const unsigned char *message, unsigned int len,
//             unsigned char *digest);

// void sha256_init(sha256_ctx * ctx);
// void sha256_update(sha256_ctx *ctx, const unsigned char *message,
//                    unsigned int len);
// void sha256_final(sha256_ctx *ctx, unsigned char *digest);
// void sha256(const unsigned char *message, unsigned int len,
//             unsigned char *digest);

// void sha384_init(sha384_ctx *ctx);
// void sha384_update(sha384_ctx *ctx, const unsigned char *message,
//                    unsigned int len);
// void sha384_final(sha384_ctx *ctx, unsigned char *digest);
// void sha384(const unsigned char *message, unsigned int len,
//             unsigned char *digest);

// void sha512_init(sha512_ctx *ctx);
// void sha512_update(sha512_ctx *ctx, const unsigned char *message,
//                    unsigned int len);
// void sha512_final(sha512_ctx *ctx, unsigned char *digest);
// void sha512(const unsigned char *message, unsigned int len,
//             unsigned char *digest);

// #ifdef __cplusplus
// }
// #endif

// #endif /* !SHA2_H */