异常如下

1.javax.crypto.BadPaddingException: Given final block not properly padded

1）要确认下是否加密和解密都是使用相同的填充算法（也就是说，是否都是使用PKCS5Padding）
2）确认下你要解密的字节数组是否正确。

javax.crypto.IllegalBlockSizeException:

Input length must be multiple of 8 when decrypting with padded cipher

输入长度必须是8的倍数时，解密密文

一、java中简单的加密解密过程

package mai.util;

import java.security.Security;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

public class ThreeDES {

private static final String Algorithm = "DESede"; //定义加密算法,可用 DES,DESede,Blowfish

//keybyte为加密密钥，长度为24字节

//src为被加密的数据缓冲区（源）

public static byte[] encryptMode(byte[] keybyte, byte[] src) {

try {

//生成密钥

SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

//加密

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.ENCRYPT_MODE, deskey);

return c1.doFinal(src);

} catch (java.security.NoSuchAlgorithmException e1) {

e1.printStackTrace();

} catch (javax.crypto.NoSuchPaddingException e2) {

e2.printStackTrace();

} catch (java.lang.Exception e3) {

e3.printStackTrace();

}

return null;

}

//keybyte为加密密钥，长度为24字节

//src为加密后的缓冲区

public static byte[] decryptMode(byte[] keybyte, byte[] src) {

try {

//生成密钥

SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);

//解密

Cipher c1 = Cipher.getInstance(Algorithm);

c1.init(Cipher.DECRYPT_MODE, deskey);

return c1.doFinal(src);

} catch (java.security.NoSuchAlgorithmException e1) {

e1.printStackTrace();

} catch (javax.crypto.NoSuchPaddingException e2) {

e2.printStackTrace();

} catch (java.lang.Exception e3) {

e3.printStackTrace();

}

return null;

}

//转换成十六进制字符串

public static String byte2hex(byte[] b) {

String hs="";

String stmp="";

for (int n=0;n<b.length;n++) {

stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));

if (stmp.length()==1) hs=hs+"0"+stmp;

else hs=hs+stmp;

if (n<b.length-1) hs=hs+":";

}

return hs.toUpperCase();

}

public static void main(String[] args)

{

//添加新安全算法,如果用JCE就要把它添加进去

Security.addProvider(new com.sun.crypto.provider.SunJCE());

final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58, (byte)0x88, 0x10, 0x40, 0x38

, 0x28, 0x25, 0x79, 0x51, (byte)0xCB, (byte)0xDD, 0x55, 0x66

, 0x77, 0x29, 0x74, (byte)0x98, 0x30, 0x40, 0x36, (byte)0xE2}; //24字节的密钥

String szSrc=\'#\'" is a 3DES test. 测试";

System.out.println("加密前的字符串:" + szSrc);

byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());

System.out.println("加密后的字符串:" + new String(encoded));

byte[] srcBytes = decryptMode(keyBytes, encoded);

System.out.println("解密后的字符串:" + (new String(srcBytes)));

}

http://www.cnblogs.com/mailingfeng/archive/2011/07/29/2120507.html

二、Android： JAVA和C# 3DES加密解密

这里的KEY采用Base64编码，便用分发，因为Java的Byte范围为-128至127，c#的Byte范围是0-255
核心是确定Mode和Padding，关于这两个的意思可以搜索3DES算法相关文章
一个是C#采用CBC
Mode，PKCS7 Padding,Java采用CBC Mode，PKCS5Padding Padding,
另一个是C#采用ECB
Mode，PKCS7 Padding,Java采用ECB Mode，PKCS5Padding
Padding,
Java的ECB模式不需要IV
对字符加密时，双方采用的都是UTF-8编码

下面是C#代码

/// <summary>
/// DES3加密解密
/// </summary>
public class Des3
{
#region CBC模式**

/// <summary>
/// DES3 CBC模式加密
/// </summary>
/// <param name="key"> 密钥 </param>
/// <param name="iv"> IV </param>
/// <param name="data"> 明文的byte数组 </param>
/// <returns> 密文的byte数组 </returns>
public static byte[] Des3EncodeCBC( byte[] key, byte[] iv, byte[] data )
{
// 复制于MSDN

try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();

TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
tdsp.Mode = CipherMode.CBC; // 默认值
tdsp.Padding = PaddingMode.PKCS7; // 默认值

// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream( mStream,
tdsp.CreateEncryptor( key, iv ),
CryptoStreamMode.Write );

// Write the byte array to the crypto stream and flush it.
cStream.Write( data, 0, data.Length );
cStream.FlushFinalBlock();

// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray();

// Close the streams.
cStream.Close();
mStream.Close();

// Return the encrypted buffer.
return ret;
}
catch ( CryptographicException e )
{
Console.WriteLine( " A Cryptographic error occurred: {0} ", e.Message );
return null;
}
}

/// <summary>
/// DES3 CBC模式解密
/// </summary>
/// <param name="key"> 密钥 </param>
/// <param name="iv"> IV </param>
/// <param name="data"> 密文的byte数组 </param>
/// <returns> 明文的byte数组 </returns>
public static byte[] Des3DecodeCBC( byte[] key, byte[] iv, byte[] data )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream( data );

TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
tdsp.Mode = CipherMode.CBC;
tdsp.Padding = PaddingMode.PKCS7;

// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream( msDecrypt,
tdsp.CreateDecryptor( key, iv ),
CryptoStreamMode.Read );

// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[data.Length];

// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length );

// Convert the buffer into a string and return it.
return fromEncrypt;
}
catch ( CryptographicException e )
{
Console.WriteLine( " A Cryptographic error occurred: {0} ", e.Message );
return null;
}
}

#endregion

#region ECB模式

/// <summary>
/// DES3 ECB模式加密
/// </summary>
/// <param name="key"> 密钥 </param>
/// <param name="iv"> IV(当模式为ECB时，IV无用) </param>
/// <param name="str"> 明文的byte数组 </param>
/// <returns> 密文的byte数组 </returns>
public static byte[] Des3EncodeECB( byte[] key, byte[] iv, byte[] data )
{
try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();

TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
tdsp.Mode = CipherMode.ECB;
tdsp.Padding = PaddingMode.PKCS7;
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream( mStream,
tdsp.CreateEncryptor( key, iv ),
CryptoStreamMode.Write );

// Write the byte array to the crypto stream and flush it.
cStream.Write( data, 0, data.Length );
cStream.FlushFinalBlock();

// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray();

// Close the streams.
cStream.Close();
mStream.Close();

// Return the encrypted buffer.
return ret;
}
catch ( CryptographicException e )
{
Console.WriteLine( " A Cryptographic error occurred: {0} ", e.Message );
return null;
}

}

/// <summary>
/// DES3 ECB模式解密
/// </summary>
/// <param name="key"> 密钥 </param>
/// <param name="iv"> IV(当模式为ECB时，IV无用) </param>
/// <param name="str"> 密文的byte数组 </param>
/// <returns> 明文的byte数组 </returns>
public static byte[] Des3DecodeECB( byte[] key, byte[] iv, byte[] data )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream( data );

TripleDESCryptoServiceProvider tdsp = new TripleDESCryptoServiceProvider();
tdsp.Mode = CipherMode.ECB;
tdsp.Padding = PaddingMode.PKCS7;

// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream( msDecrypt,
tdsp.CreateDecryptor( key, iv ),
CryptoStreamMode.Read );

// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[data.Length];

// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read( fromEncrypt, 0, fromEncrypt.Length );

// Convert the buffer into a string and return it.
return fromEncrypt;
}
catch ( CryptographicException e )
{
Console.WriteLine( " A Cryptographic error occurred: {0} ", e.Message );
return null;
}
}

#endregion

/// <summary>
/// 类测试
/// </summary>
public static void Test()
{
System.Text.Encoding utf8 = System.Text.Encoding.UTF8;

// key为abcdefghijklmnopqrstuvwx的Base64编码
byte[] key = Convert.FromBase64String( " YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4 " );
byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; // 当模式为ECB时，IV无用
byte[] data = utf8.GetBytes( " 中国ABCabc123 " );

System.Console.WriteLine( " ECB模式: " );
byte[] str1 = Des3.Des3EncodeECB( key, iv, data );
byte[] str2 = Des3.Des3DecodeECB( key, iv, str1 );
System.Console.WriteLine( Convert.ToBase64String( str1 ) );
System.Console.WriteLine( System.Text.Encoding.UTF8.GetString( str2 ) );

System.Console.WriteLine();

System.Console.WriteLine( " CBC模式: " );
byte[] str3 = Des3.Des3EncodeCBC( key, iv, data );
byte[] str4 = Des3.Des3DecodeCBC( key, iv, str3 );
System.Console.WriteLine( Convert.ToBase64String( str3 ) );
System.Console.WriteLine( utf8.GetString( str4 ) );

System.Console.WriteLine();

}

}

接着是Java代码

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.IvParameterSpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Des3 {
public static void main(String[] args) throws Exception {

byte[] key= new BASE64Decoder().decodeBuffer("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4");
byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };

byte[] data="中国ABCabc123".getBytes("UTF-8");

System.out.println("ECB加密解密");
byte[] str3 = des3EncodeECB(key,data );
byte[] str4 = ees3DecodeECB(key, str3);
System.out.println( new BASE64Encoder().encode(str3));
System.out.println( new String(str4, "UTF-8"));

System.out.println();

System.out.println("CBC加密解密");
byte[] str5 = des3EncodeCBC(key, keyiv, data);
byte[] str6 = des3DecodeCBC(key, keyiv, str5);
System.out.println( new BASE64Encoder().encode(str5));
System.out.println( new String(str6, "UTF-8"));

}

/**
* ECB加密,不要IV
* @param key 密钥
* @param data 明文
* @return Base64编码的密文
* @throws Exception
*/
public static byte[] des3EncodeECB( byte[] key, byte[] data)
throws Exception {

Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);

Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");

cipher.init(Cipher.ENCRYPT_MODE, deskey);
byte[] bOut = cipher.doFinal(data);

return bOut;
}

/**
* ECB解密,不要IV
* @param key 密钥
* @param data Base64编码的密文
* @return 明文
* @throws Exception
*/
public static byte[] ees3DecodeECB( byte[] key, byte[] data)
throws Exception {

Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);

Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");

cipher.init(Cipher.DECRYPT_MODE, deskey);

byte[] bOut = cipher.doFinal(data);

return bOut;

}

/**
* CBC加密
* @param key 密钥
* @param keyiv IV
* @param data 明文
* @return Base64编码的密文
* @throws Exception
*/
public static byte[] des3EncodeCBC( byte[] key, byte[] keyiv, byte[] data)
throws Exception {

Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);

Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(keyiv);
cipher.init(Cipher.ENCRYPT_MODE, deskey, ips);
byte[] bOut = cipher.doFinal(data);

return bOut;
}

/**
* CBC解密
* @param key 密钥
* @param keyiv IV
* @param data Base64编码的密文
* @return 明文
* @throws Exception
*/
public static byte[] des3DecodeCBC( byte[] key, byte[] keyiv, byte[] data)
throws Exception {

Key deskey = null;
DESedeKeySpec spec = new DESedeKeySpec(key);
SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
deskey = keyfactory.generateSecret(spec);

Cipher cipher = Cipher.getInstance("desede" + "/CBC/PKCS5Padding");
IvParameterSpec ips = new IvParameterSpec(keyiv);

cipher.init(Cipher.DECRYPT_MODE, deskey, ips);

byte[] bOut = cipher.doFinal(data);

return bOut;

}

}

下面是运行结果

ECB模式:
rmWB4+r9Ug93WI0KAEuMig==
中国ABCabc123

CBC模式:
4aabWF8UFour/vNfnzJrjw==
中国ABCabc123

另外，android下要使用3DES可考虑将BASE64Encoder替换成Base64

代码如下：

public static void main(String[] args) throws Exception {

byte[] key=Base64.decode("YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4".getBytes(),Base64.DEFAULT);
byte[] keyiv = { 1, 2, 3, 4, 5, 6, 7, 8 };

byte[] data="中国ABCabc123".getBytes("UTF-8");

System.out.println("ECB加密解密");
byte[] str3 = des3EncodeECB(key,data );
byte[] str4 = ees3DecodeECB(key, str3);
System.out.println( new String(Base64.encode(str3, Base64.DEFAULT),"UTF-8"));
System.out.println( new String(str4, "UTF-8"));

System.out.println();

System.out.println("CBC加密解密");
byte[] str5 = des3EncodeCBC(key, keyiv, data);
byte[] str6 = des3DecodeCBC(key, keyiv, str5);
System.out.println( new String(Base64.encode(str5, Base64.DEFAULT),"UTF-8"));
System.out.println( new String(str6, "UTF-8"));
}

原文：http://www.byywee.com/page/M0/S544/544514.html

三、java和php对等的3DES加密算法

java代码：

package org.jamie.demo;

import java.security.NoSuchAlgorithmException;

import java.security.Security;

import java.util.Random;

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESedeKeySpec;

import javax.crypto.spec.IvParameterSpec;

@SuppressWarnings("restriction")

public class TripleDES {

static {

Security.addProvider(new com.sun.crypto.provider.SunJCE());

}

private static final String MCRYPT_TRIPLEDES = "DESede";

private static final String TRANSFORMATION = "DESede/CBC/PKCS5Padding";

public static byte[] decrypt(byte[] data, byte[] key, byte[] iv) throws Exception {

DESedeKeySpec spec = new DESedeKeySpec(key);

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(MCRYPT_TRIPLEDES);

SecretKey sec = keyFactory.generateSecret(spec);

Cipher cipher = Cipher.getInstance(TRANSFORMATION);

IvParameterSpec IvParameters = new IvParameterSpec(iv);

cipher.init(Cipher.DECRYPT_MODE, sec, IvParameters);

return cipher.doFinal(data);

}

public static byte[] encrypt(byte[] data, byte[] key, byte[] iv) throws Exception {

DESedeKeySpec spec = new DESedeKeySpec(key);

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");

SecretKey sec = keyFactory.generateSecret(spec);

Cipher cipher = Cipher.getInstance(TRANSFORMATION);

IvParameterSpec IvParameters = new IvParameterSpec(iv);

cipher.init(Cipher.ENCRYPT_MODE, sec, IvParameters);

return cipher.doFinal(data);

}

public static byte[] generateSecretKey() throws NoSuchAlgorithmException {

KeyGenerator keygen = KeyGenerator.getInstance(MCRYPT_TRIPLEDES);

return keygen.generateKey().getEncoded();

}

public static byte[] randomIVBytes() {

Random ran = new Random();

byte[] bytes = new byte[8];

for (int i = 0; i < bytes.length; ++i) {

bytes[i] = (byte) ran.nextInt(Byte.MAX_VALUE + 1);

}

return bytes;

}

public static void main(String args[]) throws Exception {

String plainText = "a12*&1c中文";

final byte[] secretBytes = TripleDES.generateSecretKey();

final byte[] ivbytes = TripleDES.randomIVBytes();

System.out.println("plain text: " + plainText);

byte[] encrypt = TripleDES.encrypt(plainText.getBytes(), secretBytes, ivbytes);

System.out.println("cipher text: " + encrypt);

System.out.println("decrypt text: " + new String(TripleDES.decrypt(encrypt, secretBytes, ivbytes), "UTF-8"));

}

Php代码

<?php

class TripleDES {

public static function genIvParameter() {

return mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_TRIPLEDES,MCRYPT_MODE_CBC), MCRYPT_RAND);

}

private static function pkcs5Pad($text, $blocksize) {

$pad = $blocksize - (strlen($text) % $blocksize); // in php, strlen returns the bytes of $text

return $text . str_repeat(chr($pad), $pad);

}

private static function pkcs5Unpad($text) {

$pad = ord($text{strlen($text)-1});

if ($pad > strlen($text)) return false;

if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;

return substr($text, 0, -1 * $pad);

}

public static function encryptText($plain_text, $key, $iv) {

$padded = TripleDES::pkcs5Pad($plain_text, mcrypt_get_block_size(MCRYPT_TRIPLEDES, MCRYPT_MODE_CBC));

return mcrypt_encrypt(MCRYPT_TRIPLEDES, $key, $padded, MCRYPT_MODE_CBC, $iv);

}

public static function decryptText($cipher_text, $key, $iv) {

$plain_text = mcrypt_decrypt(MCRYPT_TRIPLEDES, $key, $cipher_text, MCRYPT_MODE_CBC, $iv);

return TripleDES::pkcs5Unpad($plain_text);

}

};

function main() {

$iv = TripleDES::genIvParameter();

print "\$iv=$iv\n";

$plain_text="this is a test，包括中文";

$key="ABCDEFGHIJ0123456789ABCD";

$cipher_text = TripleDES::encryptText($plain_text, $key, $iv);

print "\$cipher_text=$cipher_text\n";

$plain_text = TripleDES::decryptText($cipher_text, $key, $iv);

print "\$plain_text=$plain_text\n";

}

main();

java之php、Android、JAVA、C# 3DES加密解密

1.javax.crypto.BadPaddingException: Given final block not properly padded

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