iaik.security.ecc.ecdsa
Class ECPublicKey

java.lang.Object
  iaik.x509.PublicKeyInfo
      iaik.security.ecc.ecdsa.ECPublicKey

All Implemented Interfaces:

iaik.asn1.ASN1Type, java.lang.Cloneable, ECDSAKey, ECDSAPublicKey, java.security.Key, java.security.PublicKey, java.io.Serializable

public class ECPublicKey

extends iaik.x509.PublicKeyInfo

implements ECDSAPublicKey

Representation of a public key for the ECDSA algorithm and implementation of the PublicKey Interface. It is derived from PublicKeyInfo which makes it suitable for use in X.509 certificates.

See Also:

Serialized Form

Field Summary

protected static java.lang.String

ALGORITHM the name of the algorithm

Fields inherited from class iaik.x509.PublicKeyInfo

public_key_algorithm

Fields inherited from interface java.security.PublicKey

serialVersionUID

Constructor Summary

ECPublicKey(iaik.asn1.ASN1Object obj)
Creates a new PublicKeyInfo from an ASN1Object.

ECPublicKey(byte[] arr)
Creates a new PublicKey from an ASN.1 encoded DER byte array.

ECPublicKey(ECDSAParams p, ECPoint w)
Creates a new public key

ECPublicKey(ECDSAPublicKeySpec spec)
Creates a new public key from a spec.

ECPublicKey(java.io.InputStream is)
Reads the DER or BER encoded public key info from an input stream.

Method Summary

protected void	decode(byte[] publicKey) Decodes an DER encoded ECPublic Key
protected byte[]	encode()
java.lang.String	getAlgorithm() Implementation of the interface methods.
ECDSAParams	getParameter()
ECPoint	getW()
int	hashCode() Returns the hash code of this ECPublicKey.
java.lang.String	toString()
void	validatePublicKey() validates the public key

Methods inherited from class iaik.x509.PublicKeyInfo

clone, createPublicKeyInfo, decode, equals, getEncoded, getFingerprint, getFormat, getPublicKey, getPublicKey, toASN1Object, writeTo

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.security.Key

getEncoded, getFormat

Field Detail

ALGORITHM

protected static final java.lang.String ALGORITHM

the name of the algorithm

See Also:

getAlgorithm(), Constant Field Values

Constructor Detail

ECPublicKey

public ECPublicKey(iaik.asn1.ASN1Object obj)
            throws java.security.InvalidKeyException

Creates a new PublicKeyInfo from an ASN1Object.

ECPublicKey

public ECPublicKey(byte[] arr)
            throws java.security.InvalidKeyException

Creates a new PublicKey from an ASN.1 encoded DER byte array.

ECPublicKey

public ECPublicKey(ECDSAParams p,
                   ECPoint w)

Creates a new public key

Parameters:

p - the domain parameters of the elliptic curve

w - the point on the elliptic curve, satisfying W = s*G, where s is the private key

ECPublicKey

public ECPublicKey(ECDSAPublicKeySpec spec)

Creates a new public key from a spec.

Parameters:

spec - the key material

ECPublicKey

public ECPublicKey(java.io.InputStream is)
            throws java.security.InvalidKeyException,
                   java.io.IOException

Reads the DER or BER encoded public key info from an input stream.

Parameters:

is - the input stream providing the data

Throws:

java.security.InvalidKeyException - if the provided key data is invalid.

java.io.IOException - if the I/O error occurs

Method Detail

getAlgorithm

public java.lang.String getAlgorithm()

Implementation of the interface methods.

Specified by:

getAlgorithm in interface java.security.Key

Returns:

"ECDSA"

getParameter

public ECDSAParams getParameter()

Specified by:

getParameter in interface ECDSAKey

Returns:

the elliptic curve domain parameters.

See Also:

PublicKeyInfo.getPublicKey(byte[])

getW

public ECPoint getW()

Specified by:

getW in interface ECDSAPublicKey

Returns:

the public key = point on the elliptic curve

See Also:

getParameter()

hashCode

public int hashCode()

Returns the hash code of this ECPublicKey.

Returns:

the hash code of this ECPublicKey.

toString

public java.lang.String toString()

Returns:

a human readable format containing the point w and the parameters.

validatePublicKey

public void validatePublicKey()

validates the public key

decode

protected void decode(byte[] publicKey)
               throws java.security.InvalidKeyException

Decodes an DER encoded ECPublic Key

Parameters:

publicKey - the DER encoded key

Throws:

java.security.InvalidKeyException - if the encoded key is invalid or the encoded parameters are not supported.

encode

protected byte[] encode()

Returns:

the DER encoded ASN.1 public key