info.pppc.base.security

Interface IPrivateKey

All Known Subinterfaces:

ISymEncryptionKey, ISymmetricKey, ISymSigningKey

All Known Implementing Classes:

AESSymmetricKey, ECCPrivateKey, HMACSymmetricKey, RSAPrivateKey

public interface IPrivateKey

Describes a general structure for private keys. These are used for creation of signatures (which are normally used for message authentication & integrity) and for the decrypting of encrypted messages. This can only be done, if the reader used the corresponding public key for encryption.

Author:

WA

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.

Method Detail

createSignature

byte[] createSignature(byte[] message)

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)

Parameters:

message - The message which should be signed

Returns:

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

decryptMessage

byte[] decryptMessage(byte[] message)
                      throws java.io.IOException

Decrypts an encrypted message (with this private key).

Parameters:

message - The encrypted message, which should be decrypted

Returns:

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

Throws:

java.io.IOException

equals

boolean equals(java.lang.Object obj)

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.

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)