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Class IvParameterSpec

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

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

Modifier and Type	Method	Description
`byte[]`	`getIV()`	Returns the initialization vector (IV).

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

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 Details

getIV

public byte[] getIV()

Returns the initialization vector (IV).

Returns:: the initialization vector (IV). Returns a new array each time this method is called.

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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/javax/crypto/spec/IvParameterSpec.html