iaik.security.ec.common

Class EdParameterSpec

java.lang.Object

java.security.spec.ECParameterSpec

iaik.security.ec.common.ECParameterSpec

iaik.security.ec.common.EdParameterSpec

All Implemented Interfaces:

Cloneable, AlgorithmParameterSpec

Direct Known Subclasses:

EdDHParameterSpec

public class EdParameterSpec
extends ECParameterSpec

This parameter class is intended for use with EdDSA (with twisted Edwards curves) and ECDH (with Montgomery curves). It extends the ordinary ECParameterSpec with additional parameters specific to those algorithms.

Author:

Sebastian Ramacher

See Also:

ECParameterSpec, EdStandardizedParameterFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EdParameterSpec(String name, String oid, ECParameterSpec ecParams, int keySize, iaik.asn1.structures.AlgorithmID hashAlgorithm)

Method Summary

Modifier and Type	Method and Description
EdParameterSpec	clone() Creates a clone of this ECParameterSpec.
boolean	equals(Object obj)
String	getAlgorithmName() Return the canonical name of the algorithm, i.e.
iaik.asn1.structures.AlgorithmID	getHashAlgorithm() Return (hash) algorithm used to hash the initial seed and during signature generation.
int	getKeySize() Return size of the (private) key in bits.
int	hashCode()
iaik.asn1.structures.AlgorithmID	toAlgorithmID() Represent parameters as instance if AlgorithmID.
iaik.asn1.ASN1Object	toASN1Object() If the default encoding is set to oid encoding this method just returns the ObjectID otherwise the following ASN.1 structure:
String	toString() Returns a human readable String containing the base point, the order, and the elliptic curve.

Methods inherited from class iaik.security.ec.common.ECParameterSpec

decode, getCurve, getEndomorphismAux0, getEndomorphismAux1, getHashAlgorithmID, getOID, getParameterSpec, getParameterSpec, setDefaultOIDEncoding, usesDefaultOIDEncoding

Methods inherited from class java.security.spec.ECParameterSpec

getCofactor, getGenerator, getOrder

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

EdParameterSpec

protected EdParameterSpec(String name,
                          String oid,
                          ECParameterSpec ecParams,
                          int keySize,
                          iaik.asn1.structures.AlgorithmID hashAlgorithm)

Method Detail

getAlgorithmName

public String getAlgorithmName()

Return the canonical name of the algorithm, i.e. Ed25519 or Ed448.

Returns:

name of the algorithm

getHashAlgorithm

public iaik.asn1.structures.AlgorithmID getHashAlgorithm()

Return (hash) algorithm used to hash the initial seed and during signature generation.

Returns:

hash algorithm used to expand secrets

getKeySize

public int getKeySize()

Return size of the (private) key in bits.

Returns:

size of the private key

hashCode

public int hashCode()

Overrides:

hashCode in class ECParameterSpec

equals

public boolean equals(Object obj)

Overrides:

equals in class ECParameterSpec

clone

public EdParameterSpec clone()

Description copied from class: ECParameterSpec

Creates a clone of this ECParameterSpec.

The clone is not deep, i.e. the fields of this ECParameterSpec are only copied, not cloned.

Overrides:

clone in class ECParameterSpec

Returns:

the ECParameterSpec clone

toAlgorithmID

public iaik.asn1.structures.AlgorithmID toAlgorithmID()

Represent parameters as instance if AlgorithmID.

Returns:

parameters represented as AlgorithmID

toASN1Object

public iaik.asn1.ASN1Object toASN1Object()

Description copied from class: ECParameterSpec

If the default encoding is set to oid encoding this method just returns the ObjectID otherwise the following ASN.1 structure:

 ECParameters  ::= SEQUENCE {          -- Elliptic curve parameters
  version   ECPVer,
  fieldID   FieldID,
  curve     Curve,
  base      ECPoint,                   -- Base point G
  order     INTEGER,                   -- Order n of the base point
  cofactor  INTEGER  OPTIONAL,         -- The integer h = #E(Fq)/n
  hash      HashAlgorithm OPTIONAL     -- The hash algorithm that was used to generate the curve and/or the generator
 }
 

Overrides:

toASN1Object in class ECParameterSpec

Returns:

an ASN1Object instance

toString

public String toString()

Returns a human readable String containing the base point, the order, and the elliptic curve.

Overrides:

toString in class ECParameterSpec

Returns:

a human readable String containing the base point, the order, and the elliptic curve