package com.nuvole.util;
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import java.security.AlgorithmParameters;
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import java.security.Security;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import org.apache.commons.codec.binary.Base64;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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/**
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* 微信加解密工具类
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*
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* @author liujun
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* @Date 2019/5/27 17:36
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*/
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public class AesCbcUtil {
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static {
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// BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
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Security.addProvider(new BouncyCastleProvider());
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}
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/**
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* AES解密
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*
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* @param data
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* //密文，被加密的数据
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* @param key
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* //秘钥
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* @param iv
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* //偏移量
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* @param encodingFormat
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* //解密后的结果需要进行的编码
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* @return
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* @throws Exception
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*/
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public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
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// initialize();
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// 被加密的数据
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byte[] dataByte = Base64.decodeBase64(data.getBytes());
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// 加密秘钥
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byte[] keyByte = Base64.decodeBase64(key.getBytes());
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// 偏移量
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byte[] ivByte = Base64.decodeBase64(iv.getBytes());
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Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
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SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
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AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
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parameters.init(new IvParameterSpec(ivByte));
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// 初始化
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cipher.init(Cipher.DECRYPT_MODE, spec, parameters);
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byte[] resultByte = cipher.doFinal(dataByte);
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if (null != resultByte && resultByte.length > 0) {
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String result = new String(resultByte, encodingFormat);
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return result;
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}
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return null;
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}
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}
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