zeta.crypto
Class Decrypter

java.lang.Object
  |
  +--zeta.crypto.Decrypter

public class Decrypter

extends java.lang.Object

Decrypts every encrypted communication from the client using a key establishment protocol (half-certified Diffie-Hellman) with keys which have a length of 1024 Bit.

Field Summary

private Key

key

Constructor Summary

Decrypter(Key key)

Method Summary

static void	bzip2UncompressData(java.lang.String inFilename, java.lang.String outFilename) Uncompresses a specified file.
private boolean	decrypt(java.io.InputStream in, java.io.OutputStream out, java.math.BigInteger D) Decrypts a specified input stream.
void	decrypt(java.lang.String privateKey, java.lang.String inFilename, java.lang.String outFilename) Decrypts a specified input stream.
java.lang.String	decryptURLFile(java.lang.String urlFile, java.math.BigInteger D) Decrypts the file attribute of a URL where the parameters are packed in a parameter 'param'.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

key

private Key key

Constructor Detail

Decrypter

public Decrypter(Key key)

Parameters:

key - key for the decryption algorithm

Method Detail

decrypt

public void decrypt(java.lang.String privateKey,
                    java.lang.String inFilename,
                    java.lang.String outFilename)
             throws java.io.IOException

Decrypts a specified input stream. Every transfer of a result uses a key establishment protocol (half-certified Diffie-Hellman) with keys which have a length of 1024 Bit.

Parameters:

privateKey - decryption number (radix 32) for the half-certified Diffie-Hellman protocol

inFilename - name of the file which should be decrypted

outFilename - name of the decrypted file

Throws:

java.io.IOException - if an I/O error occurs.

decrypt

private boolean decrypt(java.io.InputStream in,
                        java.io.OutputStream out,
                        java.math.BigInteger D)
                 throws java.io.IOException

Decrypts a specified input stream. Every transfer of a result uses a key establishment protocol (half-certified Diffie-Hellman) with keys which have a length of 1024 Bit.

Parameters:

in - input stream which should be decrypted

out - output stream for the decrypted data

D - decryption number for the half-certified Diffie-Hellman protocol

Throws:

java.io.IOException - if an I/O error occurs.

decryptURLFile

public java.lang.String decryptURLFile(java.lang.String urlFile,
                                       java.math.BigInteger D)
                                throws java.io.IOException

Decrypts the file attribute of a URL where the parameters are packed in a parameter 'param'. The default decryption algorithmus will be used.

Parameters:

urlFile - encrypted file attribute of a URL

D - decryption number for the half-certified Diffie-Hellman protocol

Returns:

decrypted file attribute of a URL, or null if the encrypted file attribute cannot be decrypted

Throws:

java.io.IOException - if an I/O error occurs.

bzip2UncompressData

public static void bzip2UncompressData(java.lang.String inFilename,
                                       java.lang.String outFilename)
                                throws java.io.IOException

Uncompresses a specified file.

Parameters:

inFilename - name of the file which should be uncompressed

outFilename - name of the uncompressed file

Throws:

java.io.IOException - if an I/O error occurs.