Android： JAVA和C# 3DES加密解密

最近 一个项目.net 要调用JAVA的WEB

SERVICE，数据采用3DES加密，涉及到两种语言3DES一致性的问题，

下面分享一下，

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"));

}