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Tencent Cloud API SDK for Java
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/*
 * Copyright (c) 2018 THL A29 Limited, a Tencent company. All Rights Reserved.
 *
 * Licensed 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.
 */

package com.tencentcloudapi.common;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.TreeMap;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;

import com.tencentcloudapi.common.exception.TencentCloudSDKException;;

public class Sign {
  private static final Charset UTF8 = StandardCharsets.UTF_8;

  public static String sign(String secretKey, String sigStr, String sigMethod)
      throws TencentCloudSDKException {
    String sig = null;
    try {
      Mac mac = Mac.getInstance(sigMethod);
      byte[] hash;
      SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey.getBytes(UTF8), mac.getAlgorithm());

      mac.init(secretKeySpec);
      hash = mac.doFinal(sigStr.getBytes(UTF8));
      sig = DatatypeConverter.printBase64Binary(hash);
    } catch (Exception e) {
      throw new TencentCloudSDKException(e.getClass().getName() + "-" + e.getMessage());
    }
    return sig;
  }

  public static String makeSignPlainText(
      TreeMap requestParams, String reqMethod, String host, String path) {

    String retStr = "";
    retStr += reqMethod;
    retStr += host;
    retStr += path;
    retStr += buildParamStr(requestParams, reqMethod);
    return retStr;
  }

  protected static String buildParamStr(
      TreeMap requestParams, String requestMethod) {

    String retStr = "";
    for (String key : requestParams.keySet()) {
      String value = requestParams.get(key).toString();
      if (retStr.length() == 0) {
        retStr += '?';
      } else {
        retStr += '&';
      }
      retStr += key.replace("_", ".") + '=' + value;
    }
    return retStr;
  }

  public static String sha256Hex(String s) throws TencentCloudSDKException {
    MessageDigest md;
    try {
      md = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException e) {
      throw new TencentCloudSDKException("SHA-256 is not supported." + e.getMessage());
    }
    byte[] d = md.digest(s.getBytes(UTF8));
    return DatatypeConverter.printHexBinary(d).toLowerCase();
  }

  public static String sha256Hex(byte[] b) throws TencentCloudSDKException {
    MessageDigest md;
    try {
      md = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException e) {
      throw new TencentCloudSDKException("SHA-256 is not supported." + e.getMessage());
    }
    byte[] d = md.digest(b);
    return DatatypeConverter.printHexBinary(d).toLowerCase();
  }

  public static byte[] hmac256(byte[] key, String msg) throws TencentCloudSDKException {
    Mac mac;
    try {
      mac = Mac.getInstance("HmacSHA256");
    } catch (NoSuchAlgorithmException e) {
      throw new TencentCloudSDKException("HmacSHA256 is not supported." + e.getMessage());
    }
    SecretKeySpec secretKeySpec = new SecretKeySpec(key, mac.getAlgorithm());
    try {
      mac.init(secretKeySpec);
    } catch (InvalidKeyException e) {
      throw new TencentCloudSDKException(e.getClass().getName() + "-" + e.getMessage());
    }
    return mac.doFinal(msg.getBytes(UTF8));
  }
}