IvParameterSpec (Java SE 9 & JDK 9 )

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

All Implemented Interfaces:

AlgorithmParameterSpec
```
public class IvParameterSpec
extends Object
implements AlgorithmParameterSpec
```
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.

Since:

1.4

Constructor Summary

Constructors
Constructor	Description
`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.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

byte[] getIV()
Returns the initialization vector (IV).
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - IvParameterSpec
```
public IvParameterSpec(byte[] iv)
```
    Creates an IvParameterSpec object using the bytes in iv as the IV.
    
    Parameters:
    
    iv - the buffer with the IV. The contents of the buffer are copied to protect against subsequent modification.
    
    Throws:
    
    NullPointerException - if iv is null
  - IvParameterSpec
```
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 - the buffer with the IV. The first len bytes of the buffer beginning at offset inclusive are copied to protect against subsequent modification.
    
    offset - the offset in iv where the IV starts.
    
    len - 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.
- Method Detail
  - getIV
```
public byte[] getIV()
```
    Returns the initialization vector (IV).
    
    Returns:
    
    the initialization vector (IV). Returns a new array each time this method is called.