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## Package javax.crypto

Interface Summary
SecretKey: A secret (symmetric) key.

Class Summary
Cipher: This class provides the functionality of a cryptographic cipher for encryption and decryption.
CipherInputStream: A CipherInputStream is composed of an InputStream and a Cipher so that read() methods return data that are read in from the underlying InputStream but have been additionally processed by the Cipher.
CipherOutputStream: A CipherOutputStream is composed of an OutputStream and a Cipher so that write() methods first process the data before writing them out to the underlying OutputStream.
CipherSpi: This class defines the Service Provider Interface (SPI) for the `Cipher` class.
EncryptedPrivateKeyInfo: This class implements the `EncryptedPrivateKeyInfo` type as defined in PKCS #8.
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.
KeyAgreement: This class provides the functionality of a key agreement (or key exchange) protocol.
KeyAgreementSpi: This class defines the Service Provider Interface (SPI) for the `KeyAgreement` class.
KeyGenerator: This class provides the functionality of a (symmetric) key generator.
KeyGeneratorSpi: This class defines the Service Provider Interface (SPI) for the `KeyGenerator` 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.
SealedObject: This class enables a programmer to create an object and protect its confidentiality with a cryptographic algorithm.
SecretKeyFactory: This class represents a factory for secret keys.
SecretKeyFactorySpi: This class defines the Service Provider Interface (SPI) for the `SecretKeyFactory` class.

Exception Summary
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.

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