org.spongycastle.crypto.params

Class HKDFParameters

java.lang.Object

org.spongycastle.crypto.params.HKDFParameters

All Implemented Interfaces:

DerivationParameters

public class HKDFParameters
extends java.lang.Object
implements DerivationParameters

Parameter class for the HKDFBytesGenerator class.

Constructor Summary

Constructors

Constructor and Description
HKDFParameters(byte[] ikm, byte[] salt, byte[] info) Generates parameters for HKDF, specifying both the optional salt and optional info.

Method Summary

Modifier and Type	Method and Description
static HKDFParameters	defaultParameters(byte[] ikm)
byte[]	getIKM() Returns the input keying material or seed.
byte[]	getInfo() Returns the info field, which may be empty (null is converted to empty).
byte[]	getSalt() Returns the salt, or null if the salt should be generated as a byte array of HashLen zeros.
boolean	skipExtract() Returns if step 1: extract has to be skipped or not
static HKDFParameters	skipExtractParameters(byte[] ikm, byte[] info) Factory method that makes the HKDF skip the extract part of the key derivation function.

Methods inherited from class java.lang.Object

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

Constructor Detail

HKDFParameters

public HKDFParameters(byte[] ikm,
                      byte[] salt,
                      byte[] info)

Generates parameters for HKDF, specifying both the optional salt and optional info. Step 1: Extract won't be skipped.

Parameters:

ikm - the input keying material or seed

salt - the salt to use, may be null for a salt for hashLen zeros

info - the info to use, may be null for an info field of zero bytes

Method Detail

skipExtractParameters

public static HKDFParameters skipExtractParameters(byte[] ikm,
                                                   byte[] info)

Factory method that makes the HKDF skip the extract part of the key derivation function.

Parameters:

ikm - the input keying material or seed, directly used for step 2: Expand

info - the info to use, may be null for an info field of zero bytes

Returns:

HKDFParameters that makes the implementation skip step 1

defaultParameters

public static HKDFParameters defaultParameters(byte[] ikm)

getIKM

public byte[] getIKM()

Returns the input keying material or seed.

Returns:

the keying material

skipExtract

public boolean skipExtract()

Returns if step 1: extract has to be skipped or not

Returns:

true for skipping, false for no skipping of step 1

getSalt

public byte[] getSalt()

Returns the salt, or null if the salt should be generated as a byte array of HashLen zeros.

Returns:

the salt, or null

getInfo

public byte[] getInfo()

Returns the info field, which may be empty (null is converted to empty).

Returns:

the info field, never null