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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.
 */

#include "hashing.h"

#include <stdlib.h>

WS_SHA_CTX* ws_sha256_create(void) {
    WS_SHA_CTX *ctx = malloc(sizeof(WS_SHA_CTX));
    ws_sha256_init(ctx);
    return ctx;
}

#if OPENSSL_VERSION_NUMBER < 0x30000000L

void ws_sha256_init(WS_SHA_CTX *ctx) {
    SHA256_Init(ctx);
}

void ws_sha256_update(WS_SHA_CTX *ctx, const void *data, size_t length) {
    SHA256_Update(ctx, data, length);
}

void ws_sha256_final(char *md, WS_SHA_CTX *ctx) {
    SHA256_Final(md, ctx);
}

#else

void ws_sha256_init(WS_SHA_CTX *ctx) {
    EVP_MD_CTX *mdctx = EVP_MD_CTX_new();
    EVP_DigestInit_ex(mdctx, EVP_sha256(), NULL);
    *ctx = mdctx;
}

void ws_sha256_update(WS_SHA_CTX *ctx, const char *data, size_t length) {
    EVP_DigestUpdate(*ctx, data, length);
}

void ws_sha256_final(WS_SHA_CTX *ctx, unsigned char *md) {
    EVP_DigestFinal(*ctx, md, NULL);
}

#endif