使用AES/CBC/PKCS7Padding模式加解密算法

import java.security.Key;
import java.security.Security;
import java.util.Arrays;


import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AesUtil {

private static final Logger logger = LoggerFactory.getLogger(AesUtil.class);

/**
* 加密
* 模式:AES/CBC/PKCS7Padding
* 
* @param encodeRules 秘钥
* @param content 加密串
* @return
*/
public static String AESEncode(String encodeRules, String content, String ivParameter) throws Exception {


int base = 16;  
byte[] keybyte = encodeRules.getBytes("UTF-8");
if (keybyte.length % base != 0) {  
int groups = keybyte.length / base + (keybyte.length % base != 0 ? 1 : 0);  
byte[] temp = new byte[groups * base];  
Arrays.fill(temp, (byte) 0);  
System.arraycopy(keybyte, 0, temp, 0, keybyte.length);  
keybyte = temp;  
}  
// 初始化  
Security.addProvider(new BouncyCastleProvider());  
// 转化成JAVA的密钥格式  
Key key = new SecretKeySpec(keybyte, "AES");  
try {  
// 初始化cipher  
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");  
cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivParameter.getBytes()));  
byte[] encryptedText = cipher.doFinal(content.getBytes()); 
return new String(new Base64().encode(encryptedText)).replaceAll("\r\n", "");    
} catch (Exception e) {  
logger.info("AESEncode error",e); 
}
return null;    
}




/**
* 解密
* 
* @param encodeRules 秘钥
* @param content 解密串
* @return
*/
public static String AESDecode(String encodeRules, String content, String ivParameter) throws Exception {
try {  
// 判断Key是否正确  
if (encodeRules == null) {  
logger.info("Key为空null");  
return null;  
}  
// 判断Key是否为16位  
if (encodeRules.length() != 16) {  
logger.info("Key长度不是16位");  
return null;  
}  
byte[] raw = encodeRules.getBytes("UTF-8");  
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");  
IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());  
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);  
try {  
byte[] encrypted1 = new Base64().decode(content);//先用base64解密  
byte[] original = cipher.doFinal(encrypted1);  
String originalString = new String(original);  
return originalString;  
} catch (Exception e) {  
logger.info(e.toString());  
return null;  
}  
} catch (Exception ex) {  
logger.info(ex.toString());  
return null;  
}  
}
}