HMac (GNU cryptographic primitives and tools, version 2.1.0)

Class HMac

public class HMac extends BaseMac implements Cloneable

The implementation of the HMAC (Keyed-Hash Message Authentication Code).

HMAC can be used in combination with any iterated cryptographic hash function. HMAC also uses a secret key for calculation and verification of the message authentication values. The main goals behind this construction are

To use, without modifications, available hash functions. In particular, hash functions that perform well in software, and for which code is freely and widely available.
To preserve the original performance of the hash function without incurring a significant degradation.
To use and handle keys in a simple way.
To have a well understood cryptographic analysis of the strength of the authentication mechanism based on reasonable assumptions on the underlying hash function.
To allow for easy replaceability of the underlying hash function in case that faster or more secure hash functions are found or required.

References:

RFC 2104HMAC: Keyed-Hashing for Message Authentication.
H. Krawczyk, M. Bellare, and R. Canetti.

Version: $Revision: 1.10 $

Field Summary
protected int	blockSize
protected byte[]	ipad
protected IMessageDigest	ipadHash
protected int	macSize
protected IMessageDigest	opadHash
static String	USE_WITH_PKCS5_V2

Field Summary

protected int

blockSize

protected byte[]

ipad

protected IMessageDigest

ipadHash

protected int

macSize

protected IMessageDigest

opadHash

static String