com.amazonaws.mobileconnectors.cognitoidentityprovider.util

Class Hkdf

java.lang.Object

com.amazonaws.mobileconnectors.cognitoidentityprovider.util.Hkdf

public final class Hkdf
extends Object

Utility class for all HKDF operations.

Method Summary

Modifier and Type	Method and Description
byte[]	deriveKey(byte[] info, int length)
void	deriveKey(byte[] info, int length, byte[] output, int offset)
byte[]	deriveKey(String info, int length)
static Hkdf	getInstance(String algorithm) Returns an new instance
void	init(byte[] ikm)
void	init(byte[] ikm, byte[] salt)
void	unsafeInitWithoutKeyExtraction(SecretKey rawKey)

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static Hkdf getInstance(String algorithm)
                        throws NoSuchAlgorithmException

Returns an new instance

Parameters:

algorithm - the crypto algorithm

Returns:

a new instance of Hkdf

Throws:

NoSuchAlgorithmException

init

public void init(byte[] ikm)

Parameters:

ikm - REQUIRED: The input key material.

init

public void init(byte[] ikm,
                 byte[] salt)

Parameters:

ikm - REQUIRED: The input key material.

salt - REQUIRED: Random bytes for salt.

unsafeInitWithoutKeyExtraction

public void unsafeInitWithoutKeyExtraction(SecretKey rawKey)
                                    throws InvalidKeyException

Parameters:

rawKey - REQUIRED: Current secret key.

Throws:

InvalidKeyException

deriveKey

public byte[] deriveKey(String info,
                        int length)

Parameters:

info - REQUIRED

length - REQUIRED

Returns:

converted bytes.

deriveKey

public byte[] deriveKey(byte[] info,
                        int length)

Parameters:

info - REQUIRED

length - REQUIRED

Returns:

converted bytes.

deriveKey

public void deriveKey(byte[] info,
                      int length,
                      byte[] output,
                      int offset)
               throws ShortBufferException

Parameters:

info - REQUIRED

length - REQUIRED

output - REQUIRED

offset - REQUIRED

Throws:

ShortBufferException