net.i2p.crypto.eddsa

Class EdDSABlinding

java.lang.Object

net.i2p.crypto.eddsa.EdDSABlinding

public final class EdDSABlinding
extends Object

Utilities for EdDSA key blinding operations. Provides methods to blind and unblind EdDSA keys for privacy protection.

Field Summary

Fields

Modifier and Type	Field and Description
static BigInteger	ORDER

Method Summary

Modifier and Type	Method and 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 Detail

ORDER

public static final BigInteger ORDER

Method Detail

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

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

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

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