de.flexiprovider.ec.keys
Class ECPublicKey

java.lang.Object
  |
  +--de.flexiprovider.api.keys.PublicKey
        |
        +--de.flexiprovider.ec.keys.ECPublicKey

All Implemented Interfaces:

java.security.Key, Key, java.security.PublicKey, java.io.Serializable

public class ECPublicKey

extends PublicKey

The interface to a EC public key. The public key is a point W, built by W = sG, where G is generator of a subgroup with order r, and where s is the private key, an integer in the range [1, r - 1].

Author:

Birgit Henhapl, Michele Boivin

See Also:

ECPrivateKey, CurveParams, Point, Serialized Form

Fields inherited from interface java.security.Key

serialVersionUID

Fields inherited from interface java.security.PublicKey

serialVersionUID

Constructor Summary

protected	ECPublicKey(byte[] encodedW) Generate a new ECPublicKey out of the byte array encoding.
protected	ECPublicKey(Point w, CurveParams params) Generate a new ECPublicKey with the specified parameters.

Method Summary

boolean	equals(java.lang.Object other) Compare this public key with another object.
java.lang.String	getAlgorithm() Returns the name of the algorithm.
protected codec.asn1.ASN1Type	getAlgParams()
byte[]	getEncodedW()
protected byte[]	getKeyData()
protected codec.asn1.ASN1ObjectIdentifier	getOID()
CurveParams	getParams() This method returns the corresponding ECParameterSpec.
Point	getW()
int	hashCode()
java.lang.String	toString() This method returns this public key W with its corresponding ECParameterSpec as String.

Methods inherited from class de.flexiprovider.api.keys.PublicKey

getEncoded, getFormat

Methods inherited from class java.lang.Object

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

Constructor Detail

ECPublicKey

protected ECPublicKey(Point w,
                      CurveParams params)

Generate a new ECPublicKey with the specified parameters.

Parameters:

w - the point that represents the public key

params - the EC domain parameters

ECPublicKey

protected ECPublicKey(byte[] encodedW)

Generate a new ECPublicKey out of the byte array encoding.

Parameters:

encodedW - the encoded point that represents the public key

Method Detail

getW

public Point getW()
           throws InvalidKeyException

Returns:

the public key W

Throws:

InvalidKeyException - if the key has not been initialized with EC domain parameters yet.

See Also:

Point

getEncodedW

public byte[] getEncodedW()

Returns:

the uncompressed encoding of the public point W

getParams

public CurveParams getParams()

This method returns the corresponding ECParameterSpec.

Returns:

the corresponding ECParameterSpec.

See Also:

CurveParams

getAlgorithm

public java.lang.String getAlgorithm()

Returns the name of the algorithm.

Returns:

the name of the algorithm.

toString

public java.lang.String toString()

This method returns this public key W with its corresponding ECParameterSpec as String. The format is:
W = (x_W, y_W)
q = ...
a = ...
b = ...
G = (x_G, y_G)
r = ...
k = ...
In case the public point can not be decoded as no parameters are defined, it is printed as hex string with the format: W = (encoded) 0x...

Overrides:

toString in class java.lang.Object

Returns:

the public key and its corresponding EC domain parameters as String

See Also:

CurveParams

equals

public boolean equals(java.lang.Object other)

Compare this public key with another object.

Overrides:

equals in class java.lang.Object

Parameters:

other - the other object

Returns:

the result of the comparison

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code of this key

getOID

protected codec.asn1.ASN1ObjectIdentifier getOID()

Overrides:

getOID in class PublicKey

Returns:

the OID to encode in the SubjectPublicKeyInfo structure

getAlgParams

protected codec.asn1.ASN1Type getAlgParams()

Overrides:

getAlgParams in class PublicKey

Returns:

the algorithm parameters to encode in the SubjectPublicKeyInfo structure

getKeyData

protected byte[] getKeyData()

Overrides:

getKeyData in class PublicKey

Returns:

the keyData to encode in the SubjectPublicKeyInfo structure