com.alipay.api.internal.util.AlipayEncrypt Maven / Gradle / Ivy
/**
* Alipay.com Inc.
* Copyright (c) 2004-2016 All Rights Reserved.
*/
package com.alipay.api.internal.util;
import java.security.GeneralSecurityException;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import com.alipay.api.AlipayApiException;
import com.alipay.api.internal.util.codec.Base64;
/**
* 加密工具
*
* @author jiehua
* @version $Id: AlipayEncrypt.java, v 0.1 2016-3-28 下午5:14:12 jiehua Exp $
*/
public class AlipayEncrypt {
private static final String AES_ALG = "AES";
/**
* AES算法
*/
private static final String AES_CBC_PCK_ALG = "AES/CBC/PKCS5Padding";
private static final byte[] AES_IV = initIv(AES_CBC_PCK_ALG);
/**
* 加密
*
* @param content
* @param encryptType
* @param encryptKey
* @param charset
* @return
* @throws AlipayApiException
*/
public static String encryptContent(String content, String encryptType, String encryptKey,
String charset) throws AlipayApiException {
if (AES_ALG.equals(encryptType)) {
return aesEncrypt(content, encryptKey, charset);
} else {
throw new AlipayApiException("当前不支持该算法类型：encrypeType=" + encryptType);
}
}
/**
* 解密
*
* @param content
* @param encryptType
* @param encryptKey
* @param charset
* @return
* @throws AlipayApiException
*/
public static String decryptContent(String content, String encryptType, String encryptKey,
String charset) throws AlipayApiException {
if (AES_ALG.equals(encryptType)) {
return aesDecrypt(content, encryptKey, charset);
} else {
throw new AlipayApiException("当前不支持该算法类型：encrypeType=" + encryptType);
}
}
/**
* AES加密
*
* @param content
* @param aesKey
* @param charset
* @return
* @throws AlipayApiException
*/
private static String aesEncrypt(String content, String aesKey, String charset)
throws AlipayApiException {
try {
Cipher cipher = Cipher.getInstance(AES_CBC_PCK_ALG);
IvParameterSpec iv = new IvParameterSpec(AES_IV);
cipher.init(Cipher.ENCRYPT_MODE,
new SecretKeySpec(Base64.decodeBase64(aesKey.getBytes()), AES_ALG), iv);
byte[] encryptBytes = cipher.doFinal(content.getBytes(charset));
return new String(Base64.encodeBase64(encryptBytes));
} catch (Exception e) {
throw new AlipayApiException("AES加密失败：Aescontent = " + content + "; charset = "
+ charset, e);
}
}
/**
* AES解密
*
* @param content
* @param key
* @param charset
* @return
* @throws AlipayApiException
*/
private static String aesDecrypt(String content, String key, String charset)
throws AlipayApiException {
try {
Cipher cipher = Cipher.getInstance(AES_CBC_PCK_ALG);
IvParameterSpec iv = new IvParameterSpec(initIv(AES_CBC_PCK_ALG));
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(Base64.decodeBase64(key.getBytes()),
AES_ALG), iv);
byte[] cleanBytes = cipher.doFinal(Base64.decodeBase64(content.getBytes()));
return new String(cleanBytes, charset);
} catch (Exception e) {
throw new AlipayApiException("AES解密失败：Aescontent = " + content + "; charset = "
+ charset, e);
}
}
/**
* 初始向量的方法, 全部为0. 这里的写法适合于其它算法,针对AES算法的话,IV值一定是128位的(16字节).
*
* @param fullAlg
* @return
* @throws GeneralSecurityException
*/
private static byte[] initIv(String fullAlg) {
try {
Cipher cipher = Cipher.getInstance(fullAlg);
int blockSize = cipher.getBlockSize();
byte[] iv = new byte[blockSize];
for (int i = 0; i < blockSize; ++i) {
iv[i] = 0;
}
return iv;
} catch (Exception e) {
int blockSize = 16;
byte[] iv = new byte[blockSize];
for (int i = 0; i < blockSize; ++i) {
iv[i] = 0;
}
return iv;
}
}
}