svn commit: r534238 - /directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java

[er...@apache.org]

Author: erodriguez
Date: Tue May  1 13:46:42 2007
New Revision: 534238

URL: http://svn.apache.org/viewvc?view=rev&rev=534238
Log:
Adding incomplete RC4-HMAC handler.

Added:
    directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java   (with props)

Added: directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java
URL: http://svn.apache.org/viewvc/directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java?view=auto&rev=534238
==============================================================================
--- directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java (added)
+++ directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java Tue May  1 13:46:42 2007
@@ -0,0 +1,103 @@
+package org.apache.directory.server.kerberos.shared.crypto.encryption;
+
+
+import java.security.GeneralSecurityException;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.Cipher;
+import javax.crypto.Mac;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+import org.apache.directory.server.kerberos.shared.exceptions.KerberosException;
+import org.apache.directory.server.kerberos.shared.messages.value.EncryptedData;
+import org.apache.directory.server.kerberos.shared.messages.value.EncryptionKey;
+
+
+/**
+ * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
+ * @version $Rev$, $Date$
+ */
+public class ArcFourHmacMd5Encryption extends EncryptionEngine
+{
+    public EncryptionType getEncryptionType()
+    {
+        return EncryptionType.RC4_HMAC;
+    }
+
+
+    public int getChecksumLength()
+    {
+        return 16;
+    }
+
+
+    public int getConfounderLength()
+    {
+        return 8;
+    }
+
+
+    public byte[] getDecryptedData( EncryptionKey key, EncryptedData data ) throws KerberosException
+    {
+        return data.getCipherText();
+    }
+
+
+    public EncryptedData getEncryptedData( EncryptionKey key, byte[] plainText )
+    {
+        return new EncryptedData( getEncryptionType(), key.getKeyVersion(), plainText );
+    }
+
+
+    public byte[] encrypt( byte[] plainText, byte[] keyBytes )
+    {
+        return processCipher( true, plainText, keyBytes );
+    }
+
+
+    public byte[] decrypt( byte[] cipherText, byte[] keyBytes )
+    {
+        return processCipher( false, cipherText, keyBytes );
+    }
+
+
+    public byte[] calculateChecksum( byte[] data, byte[] key )
+    {
+        try
+        {
+            Mac digester = Mac.getInstance( "HmacMD5" );
+            return digester.doFinal( data );
+        }
+        catch ( NoSuchAlgorithmException nsae )
+        {
+            return null;
+        }
+    }
+
+
+    private byte[] processCipher( boolean isEncrypt, byte[] data, byte[] keyBytes )
+    {
+        try
+        {
+            Cipher cipher = Cipher.getInstance( "ARCFOUR" );
+            SecretKey key = new SecretKeySpec( keyBytes, "ARCFOUR" );
+
+            if ( isEncrypt )
+            {
+                cipher.init( Cipher.ENCRYPT_MODE, key );
+            }
+            else
+            {
+                cipher.init( Cipher.DECRYPT_MODE, key );
+            }
+
+            return cipher.doFinal( data );
+        }
+        catch ( GeneralSecurityException nsae )
+        {
+            nsae.printStackTrace();
+            return null;
+        }
+    }
+}

Propchange: directory/apacheds/branches/kerberos-encryption-types/kerberos-shared/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/ArcFourHmacMd5Encryption.java
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