NullCipher

Class Overview

The NullCipher class is a class that provides an "identity cipher" -- one that does not tranform the plaintext. As a consequence, the ciphertext is identical to the plaintext. All initialization methods do nothing, while the blocksize is set to 1 byte.

Summary

[Expand] Inherited Constants

From class javax.crypto.Cipher int DECRYPT_MODE Constant used to initialize cipher to decryption mode. int ENCRYPT_MODE Constant used to initialize cipher to encryption mode. int PRIVATE_KEY Constant used to indicate the to-be-unwrapped key is a "private key". int PUBLIC_KEY Constant used to indicate the to-be-unwrapped key is a "public key". int SECRET_KEY Constant used to indicate the to-be-unwrapped key is a "secret key". int UNWRAP_MODE Constant used to initialize cipher to key-unwrapping mode. int WRAP_MODE Constant used to initialize cipher to key-wrapping mode.

[Expand] Inherited Methods
From class javax.crypto.Cipher final int doFinal(byte[] output, int outputOffset) Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized. final byte[] doFinal(byte[] input, int inputOffset, int inputLen) Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. final int doFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. final int doFinal(byte[] input, int inputOffset, int inputLen, byte[] output) Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. final byte[] doFinal(byte[] input) Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. final int doFinal(ByteBuffer input, ByteBuffer output) Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. final byte[] doFinal() Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized. final String getAlgorithm() Returns the algorithm name of this Cipher object. final int getBlockSize() Returns the block size (in bytes). final ExemptionMechanism getExemptionMechanism() Returns the exemption mechanism object used with this cipher. final byte[] getIV() Returns the initialization vector (IV) in a new buffer. final static Cipher getInstance(String transformation, String provider) Returns a Cipher object that implements the specified transformation. final static Cipher getInstance(String transformation, Provider provider) Returns a Cipher object that implements the specified transformation. final static Cipher getInstance(String transformation) Returns a Cipher object that implements the specified transformation. final static int getMaxAllowedKeyLength(String transformation) Returns the maximum key length for the specified transformation according to the installed JCE jurisdiction policy files. final static AlgorithmParameterSpec getMaxAllowedParameterSpec(String transformation) Returns an AlgorithmParameterSpec object which contains the maximum cipher parameter value according to the jurisdiction policy file. final int getOutputSize(int inputLen) Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or doFinal operation, given the input length inputLen (in bytes). final AlgorithmParameters getParameters() Returns the parameters used with this cipher. final Provider getProvider() Returns the provider of this Cipher object. final void init(int opmode, Key key) Initializes this cipher with a key. final void init(int opmode, Key key, SecureRandom random) Initializes this cipher with a key and a source of randomness. final void init(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness. final void init(int opmode, Key key, AlgorithmParameters params, SecureRandom random) Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness. final void init(int opmode, Key key, AlgorithmParameterSpec params) Initializes this cipher with a key and a set of algorithm parameters. final void init(int opmode, Certificate certificate, SecureRandom random) Initializes this cipher with the public key from the given certificate and a source of randomness. final void init(int opmode, Certificate certificate) Initializes this cipher with the public key from the given certificate. final void init(int opmode, Key key, AlgorithmParameters params) Initializes this cipher with a key and a set of algorithm parameters. final Key unwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) Unwrap a previously wrapped key. final int update(ByteBuffer input, ByteBuffer output) Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. final byte[] update(byte[] input) Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. final int update(byte[] input, int inputOffset, int inputLen, byte[] output) Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. final byte[] update(byte[] input, int inputOffset, int inputLen) Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. final int update(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part. final byte[] wrap(Key key) Wrap a key.
From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. final void wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. final void wait(long timeout) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed.