org.bitcoin.x6763.crypto.ecdsa
Class PublicKey

java.lang.Object
  org.bitcoin.x6763.crypto.ecdsa.PublicKey

All Implemented Interfaces:

java.io.Serializable, java.security.Key, java.security.PublicKey, ECKey, ECPublicKey, Secp256k1

public class PublicKey
extends java.lang.Object
implements Secp256k1, ECPublicKey

An elliptic curve public key, generated for the secp256k1 elliptic curve.

Author:

x6763

See Also:

Serialized Form

Field Summary

static long

serialVersionUID

Fields inherited from interface org.bitcoin.x6763.crypto.ecdsa.Secp256k1

a, algorithm, b, bigX, bigY, curve, G, h, n, p, parameters, x, y

Constructor Summary

PublicKey(byte[] publicKeyBytes)
Converts a 64 or 65-byte byte-array to a public key.

PublicKey(ECPoint W)
Creates an elliptic curve public key object from an ECPoint

PublicKey(PrivateKey privateKey)
Derives a public key from a private key.

Method Summary

java.lang.String	getAlgorithm() Returns the algorithm name, "ECDSA".
byte[]	getEncoded() Encodes the public key into the same format used by Bitcoin.
java.lang.String	getFormat()
ECDomainParameters	getParams() Returns the elliptic curve domain parameters for the secp256k1 curve.
ECPoint	getW() Returns the public key coordinates as an ECPoint object
byte[]	serialize() Serializes the public key into a 64 byte array in the format of: [256-bit x-coordinate] [256-bit y-coordinate]

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

public static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

PublicKey

public PublicKey(ECPoint W)

Creates an elliptic curve public key object from an ECPoint

Parameters:

W -

PublicKey

public PublicKey(PrivateKey privateKey)

Derives a public key from a private key.

Parameters:

privateKey - a private key object that the public key will be derived from

PublicKey

public PublicKey(byte[] publicKeyBytes)
          throws java.security.InvalidKeyException

Converts a 64 or 65-byte byte-array to a public key. The byte-array is expected to contain two 256-bit numbers, the x and y coordinates of the elliptic curve public key. This constructor also supports a 65-byte byte-array containing at index 0 the byte 0x04, providing direct support for Bitcoin's public key format.

Parameters:

publicKeyBytes - a byte-array containing the x and y coordinates of a public key

Throws:

java.security.InvalidKeyException

Method Detail

getParams

public ECDomainParameters getParams()

Returns the elliptic curve domain parameters for the secp256k1 curve.

Specified by:

getParams in interface ECKey

Returns:

the secp256k1 elliptic curve domain parameters

getAlgorithm

public java.lang.String getAlgorithm()

Returns the algorithm name, "ECDSA".

Specified by:

getAlgorithm in interface java.security.Key

Returns:

the algorithm name, "EDCSA"

getEncoded

public byte[] getEncoded()

Encodes the public key into the same format used by Bitcoin. Format: 0x04 [256-bit x-coordinate] [256-bit y-coordinate]

Specified by:

getEncoded in interface java.security.Key

Returns:

the array of bytes for the Bitcoin compatible encoded public key

getFormat

public java.lang.String getFormat()

Specified by:

getFormat in interface java.security.Key

Returns:

null

getW

public ECPoint getW()

Returns the public key coordinates as an ECPoint object

Specified by:

getW in interface ECPublicKey

Returns:

the public key point W

serialize

public byte[] serialize()

Serializes the public key into a 64 byte array in the format of: [256-bit x-coordinate] [256-bit y-coordinate]

Returns:

the array of bytes of the two 256-bit public key coordinates