Package net.i2p.crypto.eddsa

Class EdDSABlinding

java.lang.Object

net.i2p.crypto.eddsa.EdDSABlinding

public final class EdDSABlinding
extends Object

Utilities for Blinding EdDSA keys. PRELIMINARY - Subject to change - see proposal 123

Since:

0.9.38

Field Summary

Fields

Modifier and Type	Field	Description
static final BigInteger	ORDER

Method Summary

Modifier and Type	Method	Description
static EdDSAPrivateKey	blind(EdDSAPrivateKey key, EdDSAPrivateKey alpha)	Only for SigType EdDSA_SHA512_Ed25519.
static EdDSAPublicKey	blind(EdDSAPublicKey key, EdDSAPrivateKey alpha)	Only for SigType EdDSA_SHA512_Ed25519.
static byte[]	reduce(byte[] b)	Use to generate alpha
static EdDSAPrivateKey	unblind(EdDSAPrivateKey key, EdDSAPrivateKey alpha)	Unimplemented, probably not needed except for testing.

Methods inherited from class java.lang.Object

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

Field Details

ORDER

public static final BigInteger ORDER

Method Details

blind

public static EdDSAPublicKey blind(EdDSAPublicKey key,
 EdDSAPrivateKey alpha)

Only for SigType EdDSA_SHA512_Ed25519.

Parameters:

key - must be SigType EdDSA_SHA512_Ed25519

alpha - generated from hash of secret data

Throws:

UnsupportedOperationException - unless supported

blind

public static EdDSAPrivateKey blind(EdDSAPrivateKey key,
 EdDSAPrivateKey alpha)

Only for SigType EdDSA_SHA512_Ed25519.

Parameters:

key - must be SigType EdDSA_SHA512_Ed25519

alpha - generated from hash of secret data

Throws:

UnsupportedOperationException - unless supported

unblind

public static EdDSAPrivateKey unblind(EdDSAPrivateKey key,
 EdDSAPrivateKey alpha)

Unimplemented, probably not needed except for testing.

Parameters:

key - must be SigType EdDSA_SHA512_Ed25519

alpha - generated from hash of secret data

Throws:

UnsupportedOperationException - unless supported

reduce

public static byte[] reduce(byte[] b)

Use to generate alpha

Parameters:

b - 64 bytes little endian of random

Returns:

32 bytes little endian mod l