craterdog.security

Class MessageCryptex

java.lang.Object

craterdog.security.MessageCryptex

All Implemented Interfaces:

MessageDecryption, MessageEncryption

public abstract class MessageCryptex
extends Object
implements MessageEncryption, MessageDecryption

This abstract class defines constants and implements invariant methods that are needed by all concrete classes that implement message encryption and decryption.

Author:

Derk Norton

Constructor Summary

Constructors

Constructor and Description
MessageCryptex()

Method Summary

Modifier and Type	Method and Description
byte[]	decodeString(String base64String) This method decodes a base 64 string into its original bytes.
void	decryptStream(SecretKey sharedKey, InputStream input, OutputStream output) This method decrypts a byte stream from an encrypted byte stream.
String	decryptString(SecretKey sharedKey, byte[] encryptedString) This method decrypts a string using a shared key.
String	encodeBytes(byte[] bytes) This method encodes a byte array into a base 64 string.
void	encryptStream(SecretKey sharedKey, InputStream input, OutputStream output) This method encrypts a byte stream using a shared key.
byte[]	encryptString(SecretKey sharedKey, String string) This method encrypts a string using a shared key.

Methods inherited from class java.lang.Object

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

Methods inherited from interface craterdog.security.MessageEncryption

encryptionOutputStream, encryptSharedKey, generateSharedKey, getAsymmetricEncryptionAlgorithm, getAsymmetricSignatureAlgorithm, getEncodingType, getHashAlgorithm, getSymmetricEncryptionAlgorithm, getSymmetricKeySize, hashString, signBytes

Methods inherited from interface craterdog.security.MessageDecryption

bytesAreValid, decryptionInputStream, decryptSharedKey

Constructor Detail

MessageCryptex

public MessageCryptex()

Method Detail

encodeBytes

public final String encodeBytes(byte[] bytes)

Description copied from interface: MessageEncryption

This method encodes a byte array into a base 64 string.

Specified by:

encodeBytes in interface MessageEncryption

Parameters:

bytes - The byte array to be encoded.

Returns:

The base 64 encoded string for those bytes.

decodeString

public final byte[] decodeString(String base64String)

Description copied from interface: MessageDecryption

This method decodes a base 64 string into its original bytes.

Specified by:

decodeString in interface MessageDecryption

Parameters:

base64String - The base 64 encoded string.

Returns:

The corresponding decoded bytes.

encryptStream

public void encryptStream(SecretKey sharedKey,
                          InputStream input,
                          OutputStream output)
                   throws IOException

Description copied from interface: MessageEncryption

This method encrypts a byte stream using a shared key.

Specified by:

encryptStream in interface MessageEncryption

Parameters:

sharedKey - The shared key used for the encryption.

input - The byte stream to be encrypted.

output - The encrypted output stream.

Throws:

IOException - Unable to encrypt the stream.

decryptStream

public void decryptStream(SecretKey sharedKey,
                          InputStream input,
                          OutputStream output)
                   throws IOException

Description copied from interface: MessageDecryption

This method decrypts a byte stream from an encrypted byte stream.

Specified by:

decryptStream in interface MessageDecryption

Parameters:

sharedKey - The shared key used for the encryption.

input - The encrypted byte stream.

output - The decrypted byte stream.

Throws:

IOException - Unable to decrypt the stream.

encryptString

public byte[] encryptString(SecretKey sharedKey,
                            String string)

Description copied from interface: MessageEncryption

This method encrypts a string using a shared key.

Specified by:

encryptString in interface MessageEncryption

Parameters:

sharedKey - The shared key used for the encryption.

string - The string to be encrypted.

Returns:

The encrypted string.

decryptString

public String decryptString(SecretKey sharedKey,
                            byte[] encryptedString)

Description copied from interface: MessageDecryption

This method decrypts a string using a shared key.

Specified by:

decryptString in interface MessageDecryption

Parameters:

sharedKey - The shared key used for the encryption.

encryptedString - The encrypted string.

Returns:

The decrypted string.