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# javax.crypto

## Interfaces

SecretKey | A secret (symmetric) key.

## Classes

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 secret (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 transform the plain text.
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.

## Exceptions

AEADBadTagException | This exception is thrown when a `Cipher` operating in an AEAD mode (such as GCM/CCM) is unable to verify the supplied authentication tag.
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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