iaik.security.ec.eddsa

Class EdDSAContext

java.lang.Object

iaik.security.ec.eddsa.EdDSAContext

All Implemented Interfaces:

AlgorithmParameterSpec

public final class EdDSAContext
extends Object
implements AlgorithmParameterSpec

Representation of a context used in context aware EdDSA variants in RFC 8032 [1]. A context is an octet string of at most 255 bytes.

To set the context for verification and signing, first create an instance of this class and then call AbstractEdDSASignature.engineSetParameter(AlgorithmParameterSpec) to set the context:

 byte[] ctx = ...;
 Signature eddsa = Signature.createInstance("Ed25519ctx", ECCelerate.getInstance());
 EdDSAContext context = new EdDSAContext(ctx);
 eddsa.setParameter(context);
 

References:

[1] S. Josefsson, I. Liusvaara, "Edwards-curve Digital Signature Algorithm (EdDSA)", https://tools.ietf.org/html/rfc8032

Author:

Sebastian Ramacher

Constructor Summary

Constructors

Constructor and Description
EdDSAContext() Creates an empty context.
EdDSAContext(byte[] context)

Method Summary

Modifier and Type	Method and Description
byte[]	getContext() Returns the context.
int	getLength() Returns the length of the context.

Methods inherited from class java.lang.Object

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

Constructor Detail

EdDSAContext

public EdDSAContext()

Creates an empty context.

EdDSAContext

public EdDSAContext(byte[] context)

Method Detail

getContext

public byte[] getContext()

Returns the context.

Returns:

the context

getLength

public int getLength()

Returns the length of the context.

Returns:

length of the context (0 - 255)