info.pppc.base.security.key

Class RSAPrivateKey

java.lang.Object

info.pppc.base.security.key.RSAPrivateKey

All Implemented Interfaces:

IPrivateKey

public class RSAPrivateKey
extends java.lang.Object
implements IPrivateKey

Implements a RSA private key, which can be used for decryption of messages and the creation of signatures.
Decrypts also the hybrid encryption used by the RSAPublicKey class.

Author:

WA

Constructor Summary

Constructors

Constructor and Description
RSAPrivateKey(byte[] privateKey) Creates a new RSAPrivateKey, which can be used for decryption of messages and creation of signatures with the given private key.

Method Summary

Methods

Modifier and Type	Method and Description
byte[]	createSignature(byte[] message) Creates a cryptographic signature (with this private key) of a message.
byte[]	decryptMessage(byte[] message) Decrypts an encrypted message (with this private key).
boolean	equals(java.lang.Object obj) Every private key has to implement a comparison operator.

Methods inherited from class java.lang.Object

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

Constructor Detail

RSAPrivateKey

public RSAPrivateKey(byte[] privateKey)
              throws java.io.IOException

Creates a new RSAPrivateKey, which can be used for decryption of messages and creation of signatures with the given private key.

Parameters:

privateKeyParam - The private key which should be used for decryption of messages and the creation of signatures

Throws:

java.io.IOException

Method Detail

createSignature

public byte[] createSignature(byte[] message)

Description copied from interface: IPrivateKey

Creates a cryptographic signature (with this private key) of a message. Normally uses the SHA-1 hash to hash the message, the hash will then be encrypted with the private key (this hash can be decrypted with the public key to verify the message)

Specified by:

createSignature in interface IPrivateKey

Parameters:

message - The message which should be signed

Returns:

An encrypted SHA-1 hash (usually) of the message

decryptMessage

public byte[] decryptMessage(byte[] message)

Description copied from interface: IPrivateKey

Decrypts an encrypted message (with this private key).

Specified by:

decryptMessage in interface IPrivateKey

Parameters:

message - The encrypted message, which should be decrypted

Returns:

The decrypted message, if the message could be successfully decrypted or null otherwise

equals

public boolean equals(java.lang.Object obj)

Description copied from interface: IPrivateKey

Every private key has to implement a comparison operator. Usually an private key equals another one, if the key is identical. This method must returns true, if the private keys equal each other.

Specified by:

equals in interface IPrivateKey

Overrides:

equals in class java.lang.Object

Parameters:

obj - The object of the type AbstractCertificate that should be compared to the current private key

Returns:

True, if the current private key and the given private key are equal, false otherwise

See Also:

Object.equals(java.lang.Object)