The following table summarizes the Crypto-J external classes:

Crypto-J Class	Description
JSAFE_AsymmetricCipher	Defines the factory method and API for all asymmetric cipher objects. This is the actual encryption object and it does not perform key management or creation.
JSAFE_Exception	Base exception class for Crypto-J. All exceptions thrown by Crypto-J extend this class.
JSAFE_Key	Generic key interface. All key objects (symmetric and asymmetric keys) implement JSAFE_Key.
JSAFE_KeyAgree	Defines the factory method and API for the key agreement objects. Currently, Crypto-J only supports Diffie-Hellman key agreement.
JSAFE_KeyPair	Holds and generates key pairs for supported asymmetric algorithms.
JSAFE_MAC	Provides a framework for Message Authentication Codes (MAC).
JSAFE_MessageDigest	Defines the factory method and API for all message digest objects, which are also known as cryptographic hash functions.
JSAFE_Parameters	Holds and generates system parameters for those algorithms that require these constructs, such as Diffie-Hellman and DSA.
JSAFE_PKCS11SessionSpec	Extends JSASFE_SessionSpec and is the concrete class used to describe how to create a session with a token inserted in a slot of a PKCS #11 compliant hardware device.
JSAFE_PrivateKey	Holds asymmetric private keys.
JSAFE_PublicKey	Holds asymmetric public keys.
JSAFE_Recode	Changes the encoding of data from binary into ASCII characters and vice versa. Currently, Crypto-J supports only Base64 encoding.
JSAFE_SecretKey	Holds and generates secret keys for symmetric encryption algorithms.
JSAFE_SecureRandom	Defines pseudo-random number generation. JSAFE_SecureRandom extends java.security.SecureRandom so you can use it to replace the Sun classes (or vice versa).
JSAFE_Session	Allows you to describe how to connect to a PKCS #11 device.
JSAFE_SessionSpec	Allows you to describe how to create a session with a hardware device.
JSAFE_Signature	Defines the factory method and API for all signature algorithm objects.
JSAFE_SymmetricCipher	Defines the factory method and API for all symmetric cipher objects.

Note: Certain public methods in some classes are not documented. These methods occur in the code as placeholders for future versions or to satisfy an interface. They are not meant to be called and could break your code in future versions of Crypto-J if you do call them.