NullCipher

public class NullCipher
extends Cipher

java.lang.Object
↳	javax.crypto.Cipher
	↳	javax.crypto.NullCipher

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

Summary

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.

Public constructors
`NullCipher()` Creates a NullCipher object.

Inherited methods

From class


        
          javax.crypto.Cipher

`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 int`	`doFinal(byte[] output, int outputOffset)` Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized.
`final byte[]`	`doFinal()` Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized.
`final byte[]`	`doFinal(byte[] input)` 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(ByteBuffer input, ByteBuffer output)` Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
`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 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.
`static final Cipher`	`getInstance(String transformation)` Returns a `Cipher` object that implements the specified transformation.
`static final Cipher`	`getInstance(String transformation, String provider)` Returns a `Cipher` object that implements the specified transformation.
`static final Cipher`	`getInstance(String transformation, Provider provider)` Returns a `Cipher` object that implements the specified transformation.
`static final int`	`getMaxAllowedKeyLength(String transformation)` Returns the maximum key length for the specified transformation according to the installed JCE jurisdiction policy files.
`static final 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, AlgorithmParameters 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, Key key, SecureRandom random)` Initializes this cipher with a key 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, Key key)` Initializes this cipher with a key.
`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, Certificate certificate)` Initializes this cipher with the public key from the given certificate.
`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 Key`	`unwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType)` Unwrap a previously wrapped key.
`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(ByteBuffer input, ByteBuffer output)` 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 void`	`updateAAD(byte[] src, int offset, int len)` Continues a multi-part update of the Additional Authentication Data (AAD), using a subset of the provided buffer.
`final void`	`updateAAD(ByteBuffer src)` Continues a multi-part update of the Additional Authentication Data (AAD).
`final void`	`updateAAD(byte[] src)` Continues a multi-part update of the Additional Authentication Data (AAD).
`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(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

NullCipher

Added in API level 1

public NullCipher ()

Creates a NullCipher object.