spring的md5加密工具类

最新推荐文章于 2024-01-06 22:55:39 发布

原创最新推荐文章于 2024-01-06 22:55:39 发布

· 475 阅读

1 ·

版权

文章标签：

#spring #md5

框架篇（SSH&SSM）专栏收录该内容

24 篇文章

订阅专栏

本文深入解析了Spring框架中DigestUtils类的MD5加密实现，包括字节加密和十六进制字符串转换的过程。提供了如何使用DigestUtils进行MD5加密的示例代码。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

//
// 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;
    }
}