Package dk.hyperdivision.multisig_hmac

Class Verify

java.lang.Object

dk.hyperdivision.multisig_hmac.Verify

public class Verify
extends Object

Verify represents a verification of a signature of data against a list of keys.

Author:

Amalie Due Jensen

Constructor Summary

Constructors

Constructor	Description
Verify()

Method Summary

Modifier and Type	Method	Description
static List<Integer>	keyIndexes(int BitField)	Computes the indexes of the keys (i.e. high bits)
static int	LeadingZeros(int BitField)
static int	PopCount(int BitField)	Computes the number of keys (i.e. high bits)
static boolean	verify(List<IndexKey> Keys, Combine Signature, byte[] data, int Threshold, String Algorithm, int BYTES)	Verifies a signature of data against a list of keys

Methods inherited from class java.lang.Object

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

Constructor Details

Verify

public Verify()

Method Details

verify

public static boolean verify(List<IndexKey> Keys, Combine Signature, byte[] data, int Threshold, String Algorithm, int BYTES) throws InvalidKeyException, NoSuchAlgorithmException

Verifies a signature of data against a list of keys

Parameters:

Keys - - list of all keys

Signature - - combined signature

data - - data which has been signed

Threshold - - minimum number of keys that the list Keys should contain

Algorithm - - algorithm used for HMAC

BYTES - - length of signature

Returns:

verification of the signature (true/false)

Throws:

InvalidKeyException - - if the given key is inappropriate for initializing this HMAC

NoSuchAlgorithmException - - if the specified algorithm is not available

keyIndexes

public static List<Integer> keyIndexes(int BitField)

Computes the indexes of the keys (i.e. high bits)

Parameters:

BitField - - indexes of keys represented as one integer

Returns:

indexes of keys in a list

PopCount

public static int PopCount(int BitField)

Computes the number of keys (i.e. high bits)

Parameters:

BitField - - indexes of keys represented as one integer

Returns:

the number of keys

LeadingZeros

public static int LeadingZeros(int BitField)