com.rsa.ace.techservice.cipher
Class AgentDesCsmCipher

java.lang.Object
  com.rsa.ace.techservice.cipher.AgentDesCsmCipher

All Implemented Interfaces:

AgentCipherProvider

public class AgentDesCsmCipher
extends java.lang.Object
implements AgentCipherProvider

Constructor Summary

AgentDesCsmCipher(byte[] keyData)

Method Summary

int	decryptPacket(byte[] agentEncryption, int decryptionOffset, byte[] cleartext) Decrypts encrypted data starting at the offset provided.
int	encryptPacket(byte[] cleartext, int cleartextLength, int encryptionOffset, byte[] agentEncryption) This encrypts the bytes passed starting at the offset provided.
byte	getCipherID() This returns the cipher ID of this provider.
int	getMaxEncryptedSize(int inputSize) This function provides the maximium amount of expansion encryption adds to a packet.
void	setKey(byte[] keyData) Sets the key to the byte array provided.

Methods inherited from class java.lang.Object

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

Constructor Detail

AgentDesCsmCipher

public AgentDesCsmCipher(byte[] keyData)
                  throws AgentCipherException

Throws:

AgentCipherException

Method Detail

setKey

public void setKey(byte[] keyData)
            throws AgentCipherException

Description copied from interface: AgentCipherProvider

Sets the key to the byte array provided.

Specified by:

setKey in interface AgentCipherProvider

Parameters:

keyData - The key to be used for encryption & decryption.

Throws:

AgentCipherException - If the key is null or the length is not valid.

See Also:

AgentCipherProvider.setKey(byte[])

decryptPacket

public int decryptPacket(byte[] agentEncryption,
                         int decryptionOffset,
                         byte[] cleartext)
                  throws AgentCipherException

Description copied from interface: AgentCipherProvider

Decrypts encrypted data starting at the offset provided.

Specified by:

decryptPacket in interface AgentCipherProvider

Parameters:

agentEncryption - The data to be decrypted.

decryptionOffset - The offset at which the encrypted data starts.

cleartext - The cleartext buffer filled upon return.

Returns:

The length of the decrypted data.

Throws:

AgentCipherException - If crypto errors occur or parameters are invalid.

See Also:

AgentCipherProvider.decryptPacket(byte[], int, byte[])

encryptPacket

public int encryptPacket(byte[] cleartext,
                         int cleartextLength,
                         int encryptionOffset,
                         byte[] agentEncryption)
                  throws AgentCipherException

Description copied from interface: AgentCipherProvider

This encrypts the bytes passed starting at the offset provided.

Specified by:

encryptPacket in interface AgentCipherProvider

Parameters:

cleartext - The cleartext buffer to be encrypted.

cleartextLength - The length of the cleartext buffer to be encrypted.

encryptionOffset - The offset at which the data should be encrypted.

agentEncryption - The returned encrypted data.

Returns:

The length of the encrypted result

Throws:

AgentCipherException - If crypto errors occur or parameters are invalid.

See Also:

AgentCipherProvider.encryptPacket(byte[], int, int, byte[])

getCipherID

public byte getCipherID()

Description copied from interface: AgentCipherProvider

This returns the cipher ID of this provider.

Specified by:

getCipherID in interface AgentCipherProvider

Returns:

The cipher ID.

See Also:

AgentCipherProvider.getCipherID()

getMaxEncryptedSize

public int getMaxEncryptedSize(int inputSize)

Description copied from interface: AgentCipherProvider

This function provides the maximium amount of expansion encryption adds to a packet. Other cipher providers can override this if they add more overhead.

Specified by:

getMaxEncryptedSize in interface AgentCipherProvider

Parameters:

inputSize - The size of the cleartext input.

Returns:

The number of extra bytes required for the given input packet size.

See Also:

AgentCipherProvider.getMaxEncryptedSize(int)