spring的md5加密工具类

绝地灬酷狼 2021-10-14 23:39 209阅读 0赞

//
    // Source code recreated from a .class file by IntelliJ IDEA
    // (powered by Fernflower decompiler)
    //
    
    package org.springframework.util;
    
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    
    public abstract class DigestUtils {
        private static final String MD5_ALGORITHM_NAME = "MD5";
        private static final char[] HEX_CHARS = new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
    
        public DigestUtils() {
        }
    
        public static byte[] md5Digest(byte[] bytes) {
            return digest("MD5", bytes);
        }
    
        public static String md5DigestAsHex(byte[] bytes) {
            return digestAsHexString("MD5", bytes);
        }
    
        public static StringBuilder appendMd5DigestAsHex(byte[] bytes, StringBuilder builder) {
            return appendDigestAsHex("MD5", bytes, builder);
        }
    
        private static MessageDigest getDigest(String algorithm) {
            try {
                return MessageDigest.getInstance(algorithm);
            } catch (NoSuchAlgorithmException var2) {
                throw new IllegalStateException("Could not find MessageDigest with algorithm \"" + algorithm + "\"", var2);
            }
        }
    
        private static byte[] digest(String algorithm, byte[] bytes) {
            return getDigest(algorithm).digest(bytes);
        }
    
        private static String digestAsHexString(String algorithm, byte[] bytes) {
            char[] hexDigest = digestAsHexChars(algorithm, bytes);
            return new String(hexDigest);
        }
    
        private static StringBuilder appendDigestAsHex(String algorithm, byte[] bytes, StringBuilder builder) {
            char[] hexDigest = digestAsHexChars(algorithm, bytes);
            return builder.append(hexDigest);
        }
    
        private static char[] digestAsHexChars(String algorithm, byte[] bytes) {
            byte[] digest = digest(algorithm, bytes);
            return encodeHex(digest);
        }
    
        private static char[] encodeHex(byte[] bytes) {
            char[] chars = new char[32];
    
            for(int i = 0; i < chars.length; i += 2) {
                byte b = bytes[i / 2];
                chars[i] = HEX_CHARS[b >>> 4 & 15];
                chars[i + 1] = HEX_CHARS[b & 15];
            }
    
            return chars;
        }
    }

> 用法：
> 
> byte\[\] 加密后的字节数组 = DigestUtils.md5Digest(源字节数组）;
> 
> String 加密后的字符串 = DigestUtils.md5DigestAsHex（源字节数组）；