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package me.chanjar.weixin.util.crypto;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

/**
 * Created by qianjia on 14/10/19.
 */
public class SHA1 {

  /**
   * 生成SHA1签名
   * @param arr
   * @return
   */
  public static String gen(String... arr) throws NoSuchAlgorithmException {
    Arrays.sort(arr);
    StringBuilder sb = new StringBuilder();
    for(String a : arr) {
      sb.append(a);
    }

    MessageDigest sha1 = MessageDigest.getInstance("SHA1");
    sha1.update(sb.toString().getBytes());
    byte[] output = sha1.digest();
    return bytesToHex(output);
  }


  protected static String bytesToHex(byte[] b) {
    char hexDigit[] = {'0', '1', '2', '3', '4', '5', '6', '7',
        '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    StringBuffer buf = new StringBuffer();
    for (int j = 0; j < b.length; j++) {
      buf.append(hexDigit[(b[j] >> 4) & 0x0f]);
      buf.append(hexDigit[b[j] & 0x0f]);
    }
    return buf.toString();
  }

}