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IvParameterSpec (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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javax.crypto.spec
Class IvParameterSpec

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

All Implemented Interfaces:

AlgorithmParameterSpec

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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

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Constructor Summary
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
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

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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.

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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