JAVA and. net des encryption and decryption

[To] original address: http://www.cnblogs.com/prince3245/archive/2010/03/23/1692630.html

JAVA and. net des encryption and decryption

A project was created a few days ago, which requires DES encryption between the two systems. One system is developed for JAVA, and the other one is developed for. Net.

I found a lot of writing methods on the Internet, but the encrypted data cannot be matched between the two systems,

I can use it after making a small modification and have tested it.

JAVA version

Import javax. crypto. Cipher;
Import javax. crypto. SecretKey;
Import javax. crypto. SecretKeyFactory;
Import javax. crypto. spec. DESKeySpec;
Import javax. crypto. spec. IvParameterSpec;


Public class Des {
Private byte [] cipher ey;


// Decrypt data
Public static String decrypt (String message, String key) throws Exception {

Byte [] bytesrc = convertHexString (message );
Cipher cipher = Cipher. getInstance ("DES/CBC/PKCS5Padding ");
DESKeySpec desKeySpec = new DESKeySpec (key. getBytes ("UTF-8 "));
SecretKeyFactory keyFactory = SecretKeyFactory. getInstance ("DES ");
SecretKey secretKey = keyFactory. generateSecret (desKeySpec );
IvParameterSpec iv = new IvParameterSpec (key. getBytes ("UTF-8 "));

Cipher. init (Cipher. DECRYPT_MODE, secretKey, iv );

Byte [] retByte = cipher. doFinal (bytesrc );
Return new String (retByte );
}

Public static byte [] encrypt (String message, String key)
Throws Exception {
Cipher cipher = Cipher. getInstance ("DES/CBC/PKCS5Padding ");

DESKeySpec desKeySpec = new DESKeySpec (key. getBytes ("UTF-8 "));

SecretKeyFactory keyFactory = SecretKeyFactory. getInstance ("DES ");
SecretKey secretKey = keyFactory. generateSecret (desKeySpec );
IvParameterSpec iv = new IvParameterSpec (key. getBytes ("UTF-8 "));
Cipher. init (Cipher. ENCRYPT_MODE, secretKey, iv );

Return cipher. doFinal (message. getBytes ("UTF-8 "));
}

Public static byte [] convertHexString (String ss)
{
Byte digest [] = new byte [ss. length ()/2];
For (int I = 0; I <digest. length; I ++)
{
String byteString = ss. substring (2 * I, 2 * I + 2 );
Int byteValue = Integer. parseInt (byteString, 16 );
Digest [I] = (byte) byteValue;
}

Return digest;
}


Public static void main (String [] args) throws Exception {
String key = "12345678 ";
String value = "test1234 ";
String jiami = java.net. URLEncoder. encode (value, "UTF-8"). toLowerCase ();

System. out. println ("encrypted data:" + jiami );
String a = toHexString (encrypt (jiami, key). toUpperCase ();


System. out. println ("encrypted data:" + );
String B = java.net. URLDecoder. decode (decrypt (a, key), "UTF-8 ");
System. out. println ("decrypted data:" + B );

}


Public static String toHexString (byte B []) {
StringBuffer hexString = new StringBuffer ();
For (int I = 0; I <B. length; I ++ ){
String plainText = Integer. toHexString (0xff & B [I]);
If (plainText. length () <2)
PlainText = "0" + plainText;
HexString. append (plainText );
}

Return hexString. toString ();
}

}

 

. NET version

Using System;
Using System. Data;
Using System. Configuration;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;
Using System. Web. UI. HtmlControls;
Using System. Data. SqlClient;
Using System. Security. Cryptography;
Using System. IO;
Using System. Text;
Public class TestDes {
// Cookies encryption key
Public static string DES_Key = "12345678 ";
 
# Region DESEnCode DES encryption
Public static string DESEnCode (string pToEncrypt, string sKey)
{
PToEncrypt = HttpContext. Current. Server. UrlEncode (pToEncrypt );
DESCryptoServiceProvider des = new DESCryptoServiceProvider ();
Byte [] inputByteArray = Encoding. GetEncoding ("UTF-8"). GetBytes (pToEncrypt );


Des. Key = ASCIIEncoding. ASCII. GetBytes (sKey );
Des. IV = ASCIIEncoding. ASCII. GetBytes (sKey );
MemoryStream MS = new MemoryStream ();
CryptoStream cs = new CryptoStream (MS, des. CreateEncryptor (), CryptoStreamMode. Write );

Cs. Write (inputByteArray, 0, inputByteArray. Length );
Cs. FlushFinalBlock ();

StringBuilder ret = new StringBuilder ();
Foreach (byte B in ms. ToArray ())
{
Ret. AppendFormat ("{0: X2}", B );
}
Ret. ToString ();
Return ret. ToString ();
}
# Endregion
 
# Region DESDeCode DES decryption
Public static string DESDeCode (string pToDecrypt, string sKey)
{
// HttpContext. Current. Response. Write (pToDecrypt + "<br>" + sKey );
// HttpContext. Current. Response. End ();
DESCryptoServiceProvider des = new DESCryptoServiceProvider ();

Byte [] inputByteArray = new byte [pToDecrypt. Length/2];
For (int x = 0; x <pToDecrypt. Length/2; x ++)
{
Int I = (Convert. ToInt32 (pToDecrypt. Substring (x * 2, 2), 16 ));
InputByteArray [x] = (byte) I;
}

Des. Key = ASCIIEncoding. ASCII. GetBytes (sKey );
Des. IV = ASCIIEncoding. ASCII. GetBytes (sKey );
MemoryStream MS = new MemoryStream ();
CryptoStream cs = new CryptoStream (MS, des. CreateDecryptor (), CryptoStreamMode. Write );
Cs. Write (inputByteArray, 0, inputByteArray. Length );
Cs. FlushFinalBlock ();

StringBuilder ret = new StringBuilder ();

Return HttpContext. Current. Server. UrlDecode (System. Text. Encoding. Default. GetString (ms. ToArray ()));
}
# Endregion

Public TestDes ()
{
//
// TODO: add the constructor logic here
//
}
}

 

A project was created a few days ago, which requires DES encryption between the two systems. One system is developed for JAVA, and the other one is developed for. Net.

I found a lot of writing methods on the Internet, but the encrypted data cannot be matched between the two systems,

I can use it after making a small modification and have tested it.

JAVA version

Import javax. crypto. Cipher;
Import javax. crypto. SecretKey;
Import javax. crypto. SecretKeyFactory;
Import javax. crypto. spec. DESKeySpec;
Import javax. crypto. spec. IvParameterSpec;


Public class Des {
Private byte [] cipher ey;


// Decrypt data
Public static String decrypt (String message, String key) throws Exception {

Byte [] bytesrc = convertHexString (message );
Cipher cipher = Cipher. getInstance ("DES/CBC/PKCS5Padding ");
DESKeySpec desKeySpec = new DESKeySpec (key. getBytes ("UTF-8 "));
SecretKeyFactory keyFactory = SecretKeyFactory. getInstance ("DES ");
SecretKey secretKey = keyFactory. generateSecret (desKeySpec );
IvParameterSpec iv = new IvParameterSpec (key. getBytes ("UTF-8 "));

Cipher. init (Cipher. DECRYPT_MODE, secretKey, iv );

Byte [] retByte = cipher. doFinal (bytesrc );
Return new String (retByte );
}

Public static byte [] encrypt (String message, String key)
Throws Exception {
Cipher cipher = Cipher. getInstance ("DES/CBC/PKCS5Padding ");

DESKeySpec desKeySpec = new DESKeySpec (key. getBytes ("UTF-8 "));

SecretKeyFactory keyFactory = SecretKeyFactory. getInstance ("DES ");
SecretKey secretKey = keyFactory. generateSecret (desKeySpec );
IvParameterSpec iv = new IvParameterSpec (key. getBytes ("UTF-8 "));
Cipher. init (Cipher. ENCRYPT_MODE, secretKey, iv );

Return cipher. doFinal (message. getBytes ("UTF-8 "));
}

Public static byte [] convertHexString (String ss)
{
Byte digest [] = new byte [ss. length ()/2];
For (int I = 0; I <digest. length; I ++)
{
String byteString = ss. substring (2 * I, 2 * I + 2 );
Int byteValue = Integer. parseInt (byteString, 16 );
Digest [I] = (byte) byteValue;
}

Return digest;
}


Public static void main (String [] args) throws Exception {
String key = "12345678 ";
String value = "test1234 ";
String jiami = java.net. URLEncoder. encode (value, "UTF-8"). toLowerCase ();

System. out. println ("encrypted data:" + jiami );
String a = toHexString (encrypt (jiami, key). toUpperCase ();


System. out. println ("encrypted data:" + );
String B = java.net. URLDecoder. decode (decrypt (a, key), "UTF-8 ");
System. out. println ("decrypted data:" + B );

}


Public static String toHexString (byte B []) {
StringBuffer hexString = new StringBuffer ();
For (int I = 0; I <B. length; I ++ ){
String plainText = Integer. toHexString (0xff & B [I]);
If (plainText. length () <2)
PlainText = "0" + plainText;
HexString. append (plainText );
}

Return hexString. toString ();
}

}

 

. NET version

Using System;
Using System. Data;
Using System. Configuration;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;
Using System. Web. UI. HtmlControls;
Using System. Data. SqlClient;
Using System. Security. Cryptography;
Using System. IO;
Using System. Text;
Public class TestDes {
// Cookies encryption key
Public static string DES_Key = "12345678 ";
 
# Region DESEnCode DES encryption
Public static string DESEnCode (string pToEncrypt, string sKey)
{
PToEncrypt = HttpContext. Current. Server. UrlEncode (pToEncrypt );
DESCryptoServiceProvider des = new DESCryptoServiceProvider ();
Byte [] inputByteArray = Encoding. GetEncoding ("UTF-8"). GetBytes (pToEncrypt );


Des. Key = ASCIIEncoding. ASCII. GetBytes (sKey );
Des. IV = ASCIIEncoding. ASCII. GetBytes (sKey );
MemoryStream MS = new MemoryStream ();
CryptoStream cs = new CryptoStream (MS, des. CreateEncryptor (), CryptoStreamMode. Write );

Cs. Write (inputByteArray, 0, inputByteArray. Length );
Cs. FlushFinalBlock ();

StringBuilder ret = new StringBuilder ();
Foreach (byte B in ms. ToArray ())
{
Ret. AppendFormat ("{0: X2}", B );
}
Ret. ToString ();
Return ret. ToString ();
}
# Endregion
 
# Region DESDeCode DES decryption
Public static string DESDeCode (string pToDecrypt, string sKey)
{
// HttpContext. Current. Response. Write (pToDecrypt + "<br>" + sKey );
// HttpContext. Current. Response. End ();
DESCryptoServiceProvider des = new DESCryptoServiceProvider ();

Byte [] inputByteArray = new byte [pToDecrypt. Length/2];
For (int x = 0; x <pToDecrypt. Length/2; x ++)
{
Int I = (Convert. ToInt32 (pToDecrypt. Substring (x * 2, 2), 16 ));
InputByteArray [x] = (byte) I;
}

Des. Key = ASCIIEncoding. ASCII. GetBytes (sKey );
Des. IV = ASCIIEncoding. ASCII. GetBytes (sKey );
MemoryStream MS = new MemoryStream ();
CryptoStream cs = new CryptoStream (MS, des. CreateDecryptor (), CryptoStreamMode. Write );
Cs. Write (inputByteArray, 0, inputByteArray. Length );
Cs. FlushFinalBlock ();

StringBuilder ret = new StringBuilder ();

Return HttpContext. Current. Server. UrlDecode (System. Text. Encoding. Default. GetString (ms. ToArray ()));
}
# Endregion

Public TestDes ()
{
//
// TODO: add the constructor logic here
//
}
}