Java笔记-AES加解密（PKCS7padding可用）

如下代码：

package cn.it1995.tool;import org.apache.tomcat.util.codec.binary.Base64; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder;import javax.crypto.*; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import java.io.UnsupportedEncodingException; import java.security.InvalidAlgorithmParameterException; import java.security.InvalidKeyException; import java.security.Key; import java.security.NoSuchAlgorithmException;public class AESUtil {public static String decrypt(String content, String key, String vi) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException, UnsupportedEncodingException, InvalidAlgorithmParameterException {// System.out.println("content : " + content); // System.out.println("key : " + key); // System.out.println("vi : " + vi);//Key k = toKey(Base64.decodeBase64(key));Key k = toKey(key.getBytes());byte[] encoded = k.getEncoded();SecretKeySpec aes = new SecretKeySpec(encoded, "AES");Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");IvParameterSpec iv = new IvParameterSpec(vi.getBytes());cipher.init(Cipher.DECRYPT_MODE, aes, iv);byte[] bytes = cipher.doFinal(Base64.decodeBase64(content));return new String(bytes, "UTF-8");}public static String encrypt(String data, String key, String vi) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, UnsupportedEncodingException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {//Key k = toKey(Base64.decodeBase64(key));Key k = toKey(key.getBytes());byte[] encoded = k.getEncoded();SecretKeySpec aes = new SecretKeySpec(encoded, "AES");Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");IvParameterSpec iv = new IvParameterSpec(vi.getBytes());cipher.init(Cipher.ENCRYPT_MODE, aes, iv);byte[] bytes = cipher.doFinal(data.getBytes("UTF-8"));return Base64.encodeBase64String(bytes);}private static Key toKey(byte[] key){SecretKeySpec aes = new SecretKeySpec(key, "AES");return aes;}public static void main(String[] args) throws NoSuchPaddingException, BadPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IllegalBlockSizeException, UnsupportedEncodingException, InvalidKeyException {String content = "7mv2MJPHj1o/rdar1I4i0Q==";String key = "sN1DEJAVZNf3OdM3";String vi = "GDHgt7hbKpsIR4b4";System.out.println("原文 : root");String e = AESUtil.encrypt("root", key, vi);System.out.println("密文 : " + e);String f = AESUtil.decrypt(e, key, vi);System.out.println("解密 : " + f);}}

运行截图如下：

这里Cipher.getInstance中使用PKCS7padding。需要Maven中新增：

<dependency><groupId>org.bouncycastle</groupId><artifactId>bcprov-ext-jdk16</artifactId><version>1.45</version> </dependency>

 这里可以接的值有

AES加密模式：ECB、CBC、CTR、OFB、CFB；

AES填充模式：pkcs5padding、pkcs7padding、zeropadding、ISO0126、ansix923、no padding。

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