de.flexiprovider.pqc.ots.lm
Class LMOTSSignature

java.lang.Object
  |
  +--java.security.SignatureSpi
        |
        +--de.flexiprovider.api.Signature
              |
              +--de.flexiprovider.pqc.ots.lm.LMOTSSignature

Direct Known Subclasses:

LMOTSSignature.GENERIC, LMOTSSignature.RIPEMD128, LMOTSSignature.RIPEMD160, LMOTSSignature.RIPEMD256, LMOTSSignature.RIPEMD320, LMOTSSignature.SHA1, LMOTSSignature.SHA224, LMOTSSignature.SHA256, LMOTSSignature.SHA384, LMOTSSignature.SHA512

public abstract class LMOTSSignature

extends Signature

This Class is used for generating and verifying Signatures according to the LMOTS Signature Scheme defined in the Paper "Asymptotically Efficient Lattice-Based Digital Signatures" by Vadim Lyubashevsky and Daniele Micciancio.

See Page 10 and 11 of the Paper for the algorithm step by step.

Inner Class Summary

static class	LMOTSSignature.GENERIC LMOTS Signature with any hash function
static class	LMOTSSignature.RIPEMD128 LMOTS Signature with RIPEMD128
static class	LMOTSSignature.RIPEMD160 LMOTS Signature with RIPEMD160
static class	LMOTSSignature.RIPEMD256 LMOTS Signature with RIPEMD256
static class	LMOTSSignature.RIPEMD320 LMOTS Signature with RIPEMD320
static class	LMOTSSignature.SHA1 LMOTS Signature with SHA1
static class	LMOTSSignature.SHA224 LMOTS Signature with SHA224
static class	LMOTSSignature.SHA256 LMOTS Signature with SHA256
static class	LMOTSSignature.SHA384 LMOTS Signature with SHA384
static class	LMOTSSignature.SHA512 LMOTS Signature with SHA512

Fields inherited from class java.security.SignatureSpi

appRandom

Constructor Summary

protected

LMOTSSignature(MessageDigest md) Constructor.

Method Summary

int	getSignatureLength()
GFP32Polynomial	hashSignature(byte[] signature) Hashes the LMOTS Signature as specified in LMOTSSignature
void	initSign(PrivateKey privKey, SecureRandom random) Initialize the signature algorithm for signing a message.
void	initVerify(PublicKey pubKey) Initialize the signature algorithm for verifying a signature.
void	setMessage(byte[] message)
void	setParameters(AlgorithmParameterSpec params) Initialize this signature engine with the specified parameter set
byte[]	sign() Sign a message.
void	update(byte input) Feed a message byte to the message digest.
void	update(byte[] input, int inOff, int inLen) Feed an array of message bytes to the message digest.
boolean	verify(byte[] signature) Verifies the supplied Signature

Methods inherited from class de.flexiprovider.api.Signature

engineGetParameter, engineInitSign, engineInitSign, engineInitVerify, engineSetParameter, engineSetParameter, engineSign, engineUpdate, engineUpdate, engineVerify, engineVerify, initSign, sign, update, verify, verify, verify

Methods inherited from class java.security.SignatureSpi

clone, engineSign

Methods inherited from class java.lang.Object

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

Constructor Detail

LMOTSSignature

protected LMOTSSignature(MessageDigest md)

Constructor.

Parameters:

md - the message digest

Method Detail

getSignatureLength

public int getSignatureLength()

hashSignature

public GFP32Polynomial hashSignature(byte[] signature)

Hashes the LMOTS Signature as specified in LMOTSSignature

Returns:

Returns the GFP32Polynomial of the hashed Signature

initSign

public void initSign(PrivateKey privKey,
                     SecureRandom random)
              throws InvalidKeyException

Initialize the signature algorithm for signing a message.

Overrides:

initSign in class Signature

Parameters:

privKey - the private key of the signer

random - a source of randomness (not used)

Throws:

InvalidKeyException - if the key is not an instance of LMOTSPrivateKey.

initVerify

public void initVerify(PublicKey pubKey)
                throws InvalidKeyException

Initialize the signature algorithm for verifying a signature.

Overrides:

initVerify in class Signature

Parameters:

pubKey - the public key of the signer.

Throws:

InvalidKeyException - if the public key is not an instance of LMOTSPublicKey.

setMessage

public void setMessage(byte[] message)

setParameters

public void setParameters(AlgorithmParameterSpec params)
                   throws InvalidAlgorithmParameterException

Initialize this signature engine with the specified parameter set

Overrides:

setParameters in class Signature

Parameters:

params - the parameters

Throws:

InvalidAlgorithmParameterException -

sign

public byte[] sign()

Sign a message.

Overrides:

sign in class Signature

Returns:

the signature.

update

public void update(byte input)

Feed a message byte to the message digest.

Overrides:

update in class Signature

Parameters:

input - the message byte

Throws:

SignatureException -

update

public void update(byte[] input,
                   int inOff,
                   int inLen)

Feed an array of message bytes to the message digest.

Overrides:

update in class Signature

Parameters:

input - the array of message bytes

inOff - index of message start

inLen - number of message bytes

verify

public boolean verify(byte[] signature)
               throws SignatureException

Verifies the supplied Signature

Overrides:

verify in class Signature

Parameters:

signature - the Signature byte array

Returns:

True if the Signature is valid, false otherwise.

Throws:

SignatureException - if the Verification fails