11-20 07:19 阅读 295

Java 实现字符串SHA1加密方法

这篇文章主要介绍了Java 实现字符串SHA1加密方法，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教

Java 字符串SHA1加密

1	`import` `java.security.MessageDigest;`

private String toUserPwd(final String password) {

  try {

   if (password == null) {

    return null;

}

   final MessageDigest messageDigest = MessageDigest.getInstance("SHA");

   final byte[] digests = messageDigest.digest(password.getBytes());

   final StringBuilder stringBuilder = new StringBuilder();

   for (int i = 0; i < digests.length; i++) {

    int halfbyte = (digests[i] >>> 4) & 0x0F;

    for (int j = 0; j <= 1; j++) {

     stringBuilder.append(

       ((0 <= halfbyte) && (halfbyte <= 9))

         ? (char) ('0' + halfbyte)

         : (char) ('a' + (halfbyte - 10)));

     halfbyte = digests[i] & 0x0F;

}

}

   return stringBuilder.toString();

  } catch (final Throwable throwable) {

   this.log.error("error converting password", throwable);

   return null;

}

}

/**

     * sha1加密

     * @param data

     * @return

     * @throws NoSuchAlgorithmException 

*/

    public static String sha1(String data) throws NoSuchAlgorithmException {

        //加盐   更安全一些

        data += "lyz";

        //信息摘要器                                算法名称

        MessageDigest md = MessageDigest.getInstance("SHA1");

        //把字符串转为字节数组

        byte[] b = data.getBytes();

        //使用指定的字节来更新我们的摘要

        md.update(b);

        //获取密文  （完成摘要计算）

        byte[] b2 = md.digest();

        //获取计算的长度

        int len = b2.length;

        //16进制字符串

        String str = "0123456789abcdef";

        //把字符串转为字符串数组

        char[] ch = str.toCharArray();

        //创建一个40位长度的字节数组

        char[] chs = new char[len*2];

        //循环20次

        for(int i=0,k=0;i<len;i++) {

            byte b3 = b2[i];//获取摘要计算后的字节数组中的每个字节

            // >>>:无符号右移  

            // &:按位与

            //0xf:0-15的数字

            chs[k++] = ch[b3 >>> 4 & 0xf];

            chs[k++] = ch[b3 & 0xf];

}

        //字符数组转为字符串

        return new String(chs);

}

1

2

3

4

5

public static void main(String[] args) throws NoSuchAlgorithmException {

    String data = "跳梁小豆tlxd666";

    String result = sha1(data);

    System.out.println("加密后："+result);

}

以上为个人经验，希望能给大家一个参考

原文链接：https://blog.csdn.net/stonezealot_zjr/article/details/98756078