Java实现AES/CBC/PKCS7Padding加解密的方法

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);
	}
}

总结

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