com.github.iotexproject.antenna.crypto

Class SECP256K1

java.lang.Object

com.github.iotexproject.antenna.crypto.SECP256K1

public final class SECP256K1
extends Object

SECP256K1 implement by bouncycastle.

Author:

Yang XuePing

Field Summary

Fields

Modifier and Type	Field and Description
static org.bouncycastle.crypto.params.ECDomainParameters	CURVE
static org.bouncycastle.asn1.x9.X9ECParameters	CURVE_PARAMS
static BigInteger	HALF_CURVE_ORDER

Constructor Summary

Constructors

Constructor and Description
SECP256K1()

Method Summary

Modifier and Type	Method and Description
static KeyPair	createSecp256k1KeyPair() generate keypair by secp256k1.
static KeyPair	createSecp256k1KeyPair(SecureRandom random) generate keypair by secp256k1.
static BigInteger	publicKeyFromPrivate(BigInteger privKey, int from) Returns public key from the given private key.
static org.bouncycastle.math.ec.ECPoint	publicPointFromPrivate(BigInteger privKey) Returns public key point from the given private key.

Methods inherited from class java.lang.Object

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

Field Detail

CURVE_PARAMS

public static final org.bouncycastle.asn1.x9.X9ECParameters CURVE_PARAMS

CURVE

public static final org.bouncycastle.crypto.params.ECDomainParameters CURVE

HALF_CURVE_ORDER

public static final BigInteger HALF_CURVE_ORDER

Constructor Detail

SECP256K1

public SECP256K1()

Method Detail

createSecp256k1KeyPair

public static KeyPair createSecp256k1KeyPair()
                                      throws NoSuchProviderException,
                                             NoSuchAlgorithmException,
                                             InvalidAlgorithmParameterException

generate keypair by secp256k1.

Returns:

Throws:

NoSuchProviderException

NoSuchAlgorithmException

InvalidAlgorithmParameterException

createSecp256k1KeyPair

public static KeyPair createSecp256k1KeyPair(SecureRandom random)
                                      throws NoSuchProviderException,
                                             NoSuchAlgorithmException,
                                             InvalidAlgorithmParameterException

generate keypair by secp256k1.

Parameters:

random -

Returns:

Throws:

NoSuchProviderException

NoSuchAlgorithmException

InvalidAlgorithmParameterException

publicKeyFromPrivate

public static BigInteger publicKeyFromPrivate(BigInteger privKey,
                                              int from)

Returns public key from the given private key.

Parameters:

privKey - the private key to derive the public key from

Returns:

BigInteger encoded public key

publicPointFromPrivate

public static org.bouncycastle.math.ec.ECPoint publicPointFromPrivate(BigInteger privKey)

Returns public key point from the given private key.

Parameters:

privKey - the private key to derive the public key from

Returns:

ECPoint public key