TransportCipherpublic class TransportCipher extends Object
| Fields Summary |
|---|
| private static boolean | internal_rc4 | | private Cipher | cipher | | private org.bouncycastle.crypto.engines.RC4Engine | rc4_engine |
| Constructors Summary |
|---|
protected TransportCipher(String algorithm, int mode, SecretKeySpec key_spec, AlgorithmParameterSpec params)
cipher = Cipher.getInstance( algorithm );
cipher.init( mode, key_spec, params );
| TransportCipher(String algorithm, int mode, SecretKeySpec key_spec)
if ( algorithm.equals( "RC4" )){
if ( !internal_rc4 ){
try{
cipher = Cipher.getInstance( algorithm );
cipher.init( mode, key_spec );
}catch( Throwable e ){
internal_rc4 = true;
}
}
if ( internal_rc4 ){
rc4_engine = new RC4Engine();
CipherParameters params = new KeyParameter(key_spec.getEncoded());
rc4_engine.init( mode == Cipher.ENCRYPT_MODE, params );
}
//System.out.println( "RC4 key: " + ByteFormatter.encodeString( key_spec.getEncoded()));
// skip first 1024 bytes of stream to protected against a Fluhrer, Mantin and Shamir attack
byte[] temp = new byte[1024];
temp = update( temp );
//System.out.println( "RC4: first discard = " + ByteFormatter.encodeString( temp, 0, 4 ));
}else{
cipher = Cipher.getInstance( algorithm );
cipher.init( mode, key_spec );
}
|
| Methods Summary |
|---|
| public java.lang.String | getName()
if ( cipher != null ){
String s = cipher.getAlgorithm();
int pos = s.indexOf("/");
if ( pos != -1 ){
s = s.substring(0,pos);
}
if ( s.equals( "RC4" )){
s = "RC4-160";
}else{
s += "-" + cipher.getBlockSize()*8;
}
return( s );
}else{
return( "RC4-160" );
}
| | protected byte[] | update(byte[] data)
return( update( data, 0, data.length ));
| | protected byte[] | update(byte[] data, int offset, int length)
byte[] result;
if ( length == 0 ){
// watch out, cipher.update returns NULL with 0 length input
result = new byte[0];
}else if ( cipher != null ){
result = cipher.update( data, offset, length );
}else{
result = new byte[length];
rc4_engine.processBytes( data, offset, length, result, 0 );
}
return( result );
| | protected void | update(java.nio.ByteBuffer source_buffer, java.nio.ByteBuffer target_buffer)
try{
// TODO: 1.5 supports update( ByteBuffer, ByteBuffer )
byte[] source_bytes;
int offset;
int length = source_buffer.remaining();
if ( source_buffer.hasArray()){
source_bytes = source_buffer.array();
offset = source_buffer.arrayOffset() + source_buffer.position();
}else{
source_bytes = new byte[length];
offset = 0;
source_buffer.get( source_bytes );
}
byte[] target_bytes = update( source_bytes, offset, length );
source_buffer.position( source_buffer.limit());
target_buffer.put( target_bytes );
}catch( Throwable e ){
throw( new IOException( Debug.getNestedExceptionMessage( e )));
}
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