最近項目需要選擇一套對稱加密算法，來滿足前后端之間的加解密操作。初步打算前端使用crypto-js來實現，后端使用java本身的加密算法實現,但遇到了一個問題：java本身只支持NoPadding和PKCS5Padding,而crypto-js提供的padding方式沒有PKCS5Padding，所以不得以，前后端最終使用PKCS7Padding來實現功能.因此只能通過引入第三方jar包的方式讓jave支持pkcs7padding

引入依賴

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

完整代碼

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';// 密鑰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);}}

總結

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