Java实现AES CBC PKCS7Padding加解密

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目录

• 引入依赖
• 完整代码

最近项目需要选择一套对称加密算法，来满足前后端之间的加解密操作。初步打算前端使用crypto- js来实现，后端使用java本身的加密算法实现,但遇到了一个问题：java本身只支持NoPadding和PKCS5Padding,而crypto- js提供的padding方式没有PKCS5Padding，所以不得以，前后端最终使用PKCS7Padding来实现功能.因此只能通过引入第三方jar包的方式让jave支持pkcs7padding

引入依赖

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk16</artifactId>
    <version>1.46</version>
</dependency>

完整代码

package com.hzjd.miniapp.util;

import java.security.Security;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.StringUtils;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import com.sun.istack.internal.NotNull;

public class AESUtil {
    private static final String CHARSET_NAME = "UTF-8";
    private static final String AES_NAME = "AES";
    // 加密模式
    public static final String ALGORITHM = "AES/CBC/PKCS7Padding";
    // 密钥
    public static final String KEY = "1954682168745975";
    // 偏移量
    public static final String IV = "1954682168745975";
    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    /**
     * 加密
     *
     * @param content
     * @param key
     * @return
     */
    public String encrypt(@NotNull String content) {
        byte[] result = null;
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            SecretKeySpec keySpec = new SecretKeySpec(KEY.getBytes(CHARSET_NAME), AES_NAME);
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(IV.getBytes());
            cipher.init(Cipher.ENCRYPT_MODE, keySpec, paramSpec);
            result = cipher.doFinal(content.getBytes(CHARSET_NAME));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return Base64.encodeBase64String(result);
    }

    /**
     * 解密
     *
     * @param content
     * @param key
     * @return
     */
    public String decrypt(@NotNull String content) {
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            SecretKeySpec keySpec = new SecretKeySpec(KEY.getBytes(CHARSET_NAME), AES_NAME);
            AlgorithmParameterSpec paramSpec = new IvParameterSpec(IV.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, keySpec, paramSpec);
            return new String(cipher.doFinal(Base64.decodeBase64(content)), CHARSET_NAME);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return StringUtils.EMPTY;
    }

    public static void main(String[] args) {
        AESUtil aes = new AESUtil();
        String contents = "121456465";
        String encrypt = aes.encrypt(contents);
        System.out.println("加密后:" + encrypt);
        String decrypt = aes.decrypt(encrypt);
        System.out.println("解密后:" + decrypt);
    }
}

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原文链接：https://www.cnblogs.com/tiro996/p/13488237.html

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