IvParameterSpec

public class IvParameterSpec
extends Object implements AlgorithmParameterSpec

java.lang.Object
↳	javax.crypto.spec.IvParameterSpec

This class specifies an initialization vector (IV). Examples which use IVs are ciphers in feedback mode, e.g., DES in CBC mode and RSA ciphers with OAEP encoding operation.

Summary

Public constructors
`IvParameterSpec(byte[] iv)` Creates an IvParameterSpec object using the bytes in `iv` as the IV.
`IvParameterSpec(byte[] iv, int offset, int len)` Creates an IvParameterSpec object using the first `len` bytes in `iv`, beginning at `offset` inclusive, as the IV.

Public methods
`byte[]`	`getIV()` Returns the initialization vector (IV).

Inherited methods

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

IvParameterSpec

Added in API level 1

public IvParameterSpec (byte[] iv)

Creates an IvParameterSpec object using the bytes in iv as the IV.

Parameters
`iv`	`byte`: the buffer with the IV. The contents of the buffer are copied to protect against subsequent modification.

Throws
`NullPointerException`	if `iv` is `null`

IvParameterSpec

Added in API level 1

public IvParameterSpec (byte[] iv, 
                int offset, 
                int len)

Creates an IvParameterSpec object using the first len bytes in iv, beginning at offset inclusive, as the IV.

The bytes that constitute the IV are those between iv[offset] and iv[offset+len-1] inclusive.

Parameters
`iv`	`byte`: the buffer with the IV. The first `len` bytes of the buffer beginning at `offset` inclusive are copied to protect against subsequent modification.
`offset`	`int`: the offset in `iv` where the IV starts.
`len`	`int`: the number of IV bytes.

Throws
`IllegalArgumentException`	if `iv` is `null` or `(iv.length - offset < len)`
`ArrayIndexOutOfBoundsException`	is thrown if `offset` or `len` index bytes outside the `iv`.

Public methods

getIV

Added in API level 1

public byte[] getIV ()

Returns the initialization vector (IV).

Returns
`byte[]`	the initialization vector (IV). Returns a new array each time this method is called.