org.web3j.crypto

Class Sign

java.lang.Object

org.web3j.crypto.Sign

public class Sign
extends java.lang.Object

Transaction signing logic.

Adapted from the BitcoinJ ECKey implementation.

Constructor Summary

Constructors

Constructor and Description
Sign()

Method Summary

Modifier and Type	Method and Description
static java.math.BigInteger	publicKeyFromPrivate(java.math.BigInteger privKey) Returns public key from the given private key.
static java.math.BigInteger	signedMessageToKey(byte[] message, org.web3j.crypto.Sign.SignatureData signatureData) Given an arbitrary piece of text and an Ethereum message signature encoded in bytes, returns the public key that was used to sign it.
static org.web3j.crypto.Sign.SignatureData	signMessage(byte[] message, ECKeyPair keyPair)

Methods inherited from class java.lang.Object

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

Constructor Detail

Sign

public Sign()

Method Detail

signMessage

public static org.web3j.crypto.Sign.SignatureData signMessage(byte[] message,
                                                              ECKeyPair keyPair)

signedMessageToKey

public static java.math.BigInteger signedMessageToKey(byte[] message,
                                                      org.web3j.crypto.Sign.SignatureData signatureData)
                                               throws java.security.SignatureException

Given an arbitrary piece of text and an Ethereum message signature encoded in bytes, returns the public key that was used to sign it. This can then be compared to the expected public key to determine if the signature was correct.

Parameters:

message - RLP encoded message.

signatureData - The message signature components

Returns:

the public key used to sign the message

Throws:

java.security.SignatureException - If the public key could not be recovered or if there was a signature format error.

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