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AES/ECB/PKCS7Padding7加密
简介：
在Java开发中，用到的AES的ECB加密模式、PKCS7Padding填充方式，Java目前仅支持PKCS5Padding填充模式，今天我将带领大家了解下，PKCS7Padding填充模式，希望可以帮到Java的开发人员，
目前Java要实现PKCS7Padding填充模式的加密，需要借助第三方Jar包才可以实现，就是在初始化的时候 Security.addProvider 增加第三方的提供者，解密的时候还是按照原来的方式。
Maven依赖：
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>1.56</version>
</dependency>
示例代码：
package com.tencent.sxwx.payment.util;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* AES 加密 ECB 模式 PKCS7Padding 填充模式
*
* @author
*
*/
public class AESECBPKCS7Padding {
static String ENCRYPT_CHARSET = "UTF-8";
static String mode = "AES/ECB/PKCS7Padding";
public static void main(String[] args) throws Exception {
String content = "hello World";
String password = "151";
System.out.println("原内容：\n"+content);
String tempContent = encrypt(content,password,mode);
System.err.println("加密后：\n"+tempContent);
tempContent = decrypt(tempContent, password,mode );
System.out.println("解密后：\n"+tempContent);
}
public static String encrypt(String content, String password, String mode) {
try {
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
KeyGenerator kgen = KeyGenerator.getInstance("AES");
secureRandom.setSeed(password.getBytes());
kgen.init(128, secureRandom);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
Cipher cipher = Cipher.getInstance(mode);// 创建密码器
byte[] byteContent = content.getBytes(ENCRYPT_CHARSET);
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(byteContent);
if (result != null && result.length > 0) {
/*
* 注意： return new String(result,ENCRYPT_CHARSET);
* 会出现javax.crypto.IllegalBlockSizeException: Input length must be multiple of
* 16 when decrypting with padded cipher 加密后的byte数组是不能强制转换成字符串的，
* 字符串和byte数组在这种情况下不是互逆的； 需要将二进制数据转换成十六进制表示
*/
return parseByte2HexStr(result);
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* 解密
*
* @param content 待解密内容
* @param password 解密密钥
* @return
*/
public static String decrypt(String content, String password, String mode) throws Exception {
try {
if (content == null) {
return null;
}
byte[] newContent = parseHexStr2Byte(content);// 将16进制转换为二进制
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
KeyGenerator kgen = KeyGenerator.getInstance("AES");
secureRandom.setSeed(password.getBytes());
kgen.init(128, secureRandom);
// kgen.init(128, new SecureRandom(password.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
Cipher cipher = Cipher.getInstance(mode);// 创建密码器
cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(newContent);
if (result != null && result.length > 0) {
return new String(result, "UTF-8");
}
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
return null;
}
/**
* 将二进制转换成16进制
*
* @param buf
* @return
*/
public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
}
return sb.toString();
}
/**
* 将16进制转换为二进制
*
* @param hexStr
* @return
*/
public static byte[] parseHexStr2Byte(String hexStr) {
if (hexStr.length() < 1)
return null;
byte[] result = new byte[hexStr.length() / 2];
for (int i = 0; i < hexStr.length() / 2; i++) {
int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
result[i] = (byte) (high * 16 + low);
}
return result;
}
}
控制台输出：
