// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "util/sm3.h"

#include <openssl/evp.h>

#include <stdint.h>

#include "common/logging.h"

namespace doris {

SM3Digest::SM3Digest() {

    _md = EVP_sm3();

    _ctx = EVP_MD_CTX_new();

    EVP_DigestInit_ex(_ctx, _md, NULL);

}

SM3Digest::~SM3Digest() {

    EVP_MD_CTX_free(_ctx);

}

void SM3Digest::update(const void* data, size_t length) {

    EVP_DigestUpdate(_ctx, data, length);

}

void SM3Digest::digest() {

    unsigned char buf[SM3_DIGEST_LENGTH];

    uint32_t length;

    EVP_DigestFinal_ex(_ctx, buf, &length);

    DCHECK_EQ(SM3_DIGEST_LENGTH, length);

    char hex_buf[2 * SM3_DIGEST_LENGTH];

    static char dig_vec_lower[] = "0123456789abcdef";

    char* to = hex_buf;

    for (int i = 0; i < SM3_DIGEST_LENGTH; ++i) {

        *to++ = dig_vec_lower[buf[i] >> 4];

        *to++ = dig_vec_lower[buf[i] & 0x0F];

    }

    _hex.assign(hex_buf, 2 * SM3_DIGEST_LENGTH);

}

} // namespace doris