network.finschia.sdk.crypto

Class ECDSASignature

java.lang.Object

network.finschia.sdk.crypto.ECDSASignature

public class ECDSASignature
extends java.lang.Object

Original Code https://github.com/web3j/web3j/blob/master/crypto/src/main/java/org/web3j/crypto/Sign.java

Transaction signing logic.

Adapted from the BitcoinJ ECKey implementation.

Constructor Summary

Constructors

Constructor and Description
ECDSASignature(byte[] privateKey)

Method Summary

Modifier and Type	Method and Description
byte	findRecoveryId(java.math.BigInteger[] sig, byte[] message) Returns the recovery ID, a byte with value between 0 and 3, inclusive, that specifies which of 4 possible curve points were used to sign a message.
java.math.BigInteger[]	generateSignature(byte[] message) generate a signature for the given message using the key we were initialised with
static java.math.BigInteger	publicFromPoint(byte[] bits) Returns public key point from the given curve.
static java.math.BigInteger	publicKeyFromPrivate(java.math.BigInteger privKey) Returns public key from the given private key.
static org.bouncycastle.math.ec.ECPoint	publicPointFromPrivate(java.math.BigInteger privKey) Returns public key point from the given private key.
byte[]	recoverableSerialize(java.math.BigInteger[] sig, byte[] message) Serialize the result of `generateSignature` and recovery id

Methods inherited from class java.lang.Object

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

Constructor Detail

ECDSASignature

public ECDSASignature(byte[] privateKey)

Method Detail

recoverableSerialize

public byte[] recoverableSerialize(java.math.BigInteger[] sig,
                                   byte[] message)

Serialize the result of `generateSignature` and recovery id

Parameters:

sig - the R and S components of the signature, wrapped.

message - Hash of the data that was signed.

Returns:

32 bytes for R + 32 bytes for S + 1 byte for recovery id

generateSignature

public java.math.BigInteger[] generateSignature(byte[] message)

generate a signature for the given message using the key we were initialised with

Parameters:

message - Hash of the data that was signed.

Returns:

the R and S components of the signature, wrapped.

findRecoveryId

public byte findRecoveryId(java.math.BigInteger[] sig,
                           byte[] message)

Returns the recovery ID, a byte with value between 0 and 3, inclusive, that specifies which of 4 possible curve points were used to sign a message. This value is also referred to as "v".

Parameters:

sig - the R and S components of the signature, wrapped.

message - Hash of the data that was signed.

Returns:

recId which is a possible key to recover.

Throws:

java.lang.RuntimeException - if no recovery ID can be found.

publicKeyFromPrivate

public static java.math.BigInteger publicKeyFromPrivate(java.math.BigInteger privKey)

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(java.math.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

publicFromPoint

public static java.math.BigInteger publicFromPoint(byte[] bits)

Returns public key point from the given curve.

Parameters:

bits - representing the point on the curve

Returns:

BigInteger encoded public key