Package javax.crypto

Provides the classes and interfaces for cryptographic operations. The cryptographic operations defined in this package include encryption, key generation and key agreement, and Message Authentication Code (MAC) generation.

Support for encryption includes symmetric, asymmetric, block, and stream ciphers. This package also supports secure streams and sealed objects.

Many of the classes provided in this package are provider-based. The class itself defines a programming interface to which applications may write. The implementations themselves may then be written by independent third-party vendors and plugged in seamlessly as needed. Therefore application developers may take advantage of any number of provider-based implementations without having to add or rewrite code.

Java Security Standard Algorithm Names Specification

Related Documentation

For further documentation, please see:

Since:: 1.4

Interface Summary
Interface	Description
SecretKey	A secret (symmetric) key.

Class Summary
Class	Description
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.

Exception Summary
Exception	Description
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.