Java利用 AES/ECB/PKCS5Padding 算法加解密
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2022-05-30 21:49:53
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对称加密、解密
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* AES加解密
*/
public class AES {
/**
* 密钥算法
*/
private static final String ALGORITHM = "AES";
/**
* 加解密算法/工作模式/填充方式
*/
private static final String ALGORITHM_STR = "AES/ECB/PKCS5Padding";
/**
* SecretKeySpec类是KeySpec接口的实现类,用于构建秘密密钥规范
*/
private SecretKeySpec key;
public AES(String hexKey) {
key = new SecretKeySpec(hexKey.getBytes(), ALGORITHM);
}
/**
* AES加密
* @param data
* @return
* @throws Exception
*/
public String encryptData(String data) throws Exception {
Cipher cipher = Cipher.getInstance(ALGORITHM_STR); // 创建密码器
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
return new BASE64Encoder().encode(cipher.doFinal(data.getBytes()));
}
/**
* AES解密
* @param base64Data
* @return
* @throws Exception
*/
public String decryptData(String base64Data) throws Exception{
Cipher cipher = Cipher.getInstance(ALGORITHM_STR);
cipher.init(Cipher.DECRYPT_MODE, key);
return new String(cipher.doFinal(new BASE64Decoder().decodeBuffer(base64Data)));
}
/**
* hex字符串 转 byte数组
* @param s
* @return
*/
private static byte[] hex2byte(String s) {
if (s.length() % 2 == 0) {
return hex2byte (s.getBytes(), 0, s.length() >> 1);
} else {
return hex2byte("0"+s);
}
}
private static byte[] hex2byte (byte[] b, int offset, int len) {
byte[] d = new byte[len];
for (int i=0; i<len*2; i++) {
int shift = i%2 == 1 ? 0 : 4;
d[i>>1] |= Character.digit((char) b[offset+i], 16) << shift;
}
return d;
}
public static void main(String[] args) throws Exception {
AES util = new AES("abcdefghijklmnop"); // 公开密钥
System.out.println("cardNo:"+util.encryptData("1234_abcd")); // 加密
System.out.println("exp:"+util.decryptData("Qd05HTY/pEPi2h9+PFXN9g==")); // 解密
}
}
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