/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "HMACSHA1.h"
#include "BigNumber.h"
#include "Errors.h"
#include <cstring>

#if defined(OPENSSL_VERSION_NUMBER) && OPENSSL_VERSION_NUMBER < 0x10100000L
HMAC_CTX* HMAC_CTX_new()
{
    HMAC_CTX *ctx = new HMAC_CTX();
    HMAC_CTX_init(ctx);
    return ctx;
}

void HMAC_CTX_free(HMAC_CTX* ctx)
{
    HMAC_CTX_cleanup(ctx);
    delete ctx;
}
#endif

HmacHash::HmacHash(uint32 len, uint8* seed)
{
    m_ctx = HMAC_CTX_new();
    HMAC_Init_ex(m_ctx, seed, len, EVP_sha1(), nullptr);
    memset(m_digest, 0, sizeof(m_digest));
}

HmacHash::~HmacHash()
{
    HMAC_CTX_free(m_ctx);
}

void HmacHash::UpdateData(std::string const& str)
{
    HMAC_Update(m_ctx, reinterpret_cast<uint8 const*>(str.c_str()), str.length());
}

void HmacHash::UpdateData(uint8 const* data, size_t len)
{
    HMAC_Update(m_ctx, data, len);
}

void HmacHash::Finalize()
{
    uint32 length = 0;
    HMAC_Final(m_ctx, m_digest, &length);
    ASSERT(length == SHA_DIGEST_LENGTH);
}

uint8* HmacHash::ComputeHash(BigNumber* bn)
{
    HMAC_Update(m_ctx, bn->AsByteArray().get(), bn->GetNumBytes());
    Finalize();
    return m_digest;
}