javax.crypto

Interfaces

SecretKey A secret (symmetric) key. 

Classes

Cipher This class provides the functionality of a cryptographic cipher for encryption and decryption. 
CipherSpi This class defines the Service Provider Interface (SPI) for the Cipher class. 
ExemptionMechanism This class provides the functionality of an exemption mechanism, examples of which are key recovery, key weakening, and key escrow
ExemptionMechanismSpi This class defines the Service Provider Interface (SPI) for the ExemptionMechanism class. 
Mac This class provides the functionality of a "Message Authentication Code" (MAC) algorithm. 
MacSpi This class defines the Service Provider Interface (SPI) for the Mac class. 
NullCipher The NullCipher class is a class that provides an "identity cipher" -- one that does not tranform the plaintext. 
SecretKeyFactory This class represents a factory for secret keys. 
SecretKeyFactorySpi This class defines the Service Provider Interface (SPI) for the SecretKeyFactory class. 

Exceptions

BadPaddingException This exception is thrown when a particular padding mechanism is expected for the input data but the data is not padded properly. 
ExemptionMechanismException This is the generic ExemptionMechanism exception. 
IllegalBlockSizeException This exception is thrown when the length of data provided to a block cipher is incorrect, i.e., does not match the block size of the cipher. 
NoSuchPaddingException This exception is thrown when a particular padding mechanism is requested but is not available in the environment. 
ShortBufferException This exception is thrown when an output buffer provided by the user is too short to hold the operation result.