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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2025 Olaf Wintermann. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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 HASHING_H
#define HASHING_H


#ifdef __APPLE__
/* macos */

#define WS_CRYPTO_COMMON_CRYPTO

#define WS_AES_CTX              CCCryptorRef
#define WS_SHA_CTX              CC_SHA256_CTX
#define WS_SHA256_DIGEST_LENGTH 32

#include <CommonCrypto/CommonCrypto.h>
#include <CommonCrypto/CommonDigest.h>

#elif defined(_WIN32)

#define WS_CRYPTO_CNG

#include <windows.h>
#include <bcrypt.h>

typedef struct WinBCryptCTX {
    BCRYPT_ALG_HANDLE hAlg;
    BCRYPT_KEY_HANDLE hKey;
    void              *pbKeyObject;
    unsigned char     pbIV[16];
    
    unsigned char     buf[16];
    ULONG             buflen;
} WinBCryptCTX;

typedef struct WinBCryptSHACTX {
    BCRYPT_ALG_HANDLE  hAlg;
    BCRYPT_HASH_HANDLE hHash;    
    void               *pbHashObject;
} WinBCryptSHACTX;

#define WS_AES_CTX              WinBCryptCTX
#define WS_SHA_CTX              WinBCryptSHACTX
#define WS_SHA256_DIGEST_LENGTH 32

#else
/* unix/linux */

#include <openssl/evp.h>
#include <openssl/rand.h>

#define WS_USE_OPENSSL

#define WS_AES_CTX              EVP_CIPHER_CTX*

#if OPENSSL_VERSION_NUMBER < 0x30000000L
#define WS_SHA_CTX              SHA256_CTX
#else
#define WS_SHA_CTX              EVP_MD_CTX*
#endif
#define WS_SHA256_DIGEST_LENGTH 32


#if defined(__sun) && defined(__SunOS_5_10)
#include <sha2.h>
#define SHA256_Init     SHA256Init
#define SHA256_Update   SHA256Update
#define SHA256_Final    SHA256Final
#else
#include <openssl/sha.h>
#endif

#endif


void ws_sha256_init(WS_SHA_CTX *ctx);
WS_SHA_CTX* ws_sha256_create(void);
void ws_sha256_update(WS_SHA_CTX *ctx, const char *data, size_t len);
void ws_sha256_final(WS_SHA_CTX *ctx, unsigned char *buf);


#ifdef __cplusplus
}
#endif

#endif /* HASHING_H */