org.web3j.crypto

类 Sign

java.lang.Object

org.web3j.crypto.Sign

public class Sign
extends java.lang.Object

Transaction signing logic.

Adapted from the BitcoinJ ECKey implementation.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	Sign.SignatureData

构造器概要

构造器

构造器和说明
Sign()

方法概要

限定符和类型	方法和说明
static java.math.BigInteger	publicKeyFromPrivate(java.math.BigInteger privKey) Returns public key from the given private key.
static java.math.BigInteger	recoverFromSignature(int recId, ECDSASignature sig, byte[] message) Given the components of a signature and a selector value, recover and return the public key that generated the signature according to the algorithm in SEC1v2 section 4.1.6.
static java.math.BigInteger	signedMessageToKey(byte[] message, 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 Sign.SignatureData	signMessage(byte[] message, ECKeyPair keyPair)
static Sign.SignatureData	signMessage(byte[] message, ECKeyPair keyPair, boolean needToHash)

从类继承的方法 java.lang.Object

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

构造器详细资料

Sign

public Sign()

方法详细资料

signMessage

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

signMessage

public static Sign.SignatureData signMessage(byte[] message,
                                             ECKeyPair keyPair,
                                             boolean needToHash)

recoverFromSignature

public static java.math.BigInteger recoverFromSignature(int recId,
                                                        ECDSASignature sig,
                                                        byte[] message)

Given the components of a signature and a selector value, recover and return the public key that generated the signature according to the algorithm in SEC1v2 section 4.1.6.

The recId is an index from 0 to 3 which indicates which of the 4 possible keys is the correct one. Because the key recovery operation yields multiple potential keys, the correct key must either be stored alongside the signature, or you must be willing to try each recId in turn until you find one that outputs the key you are expecting.

If this method returns null it means recovery was not possible and recId should be iterated.

Given the above two points, a correct usage of this method is inside a for loop from 0 to 3, and if the output is null OR a key that is not the one you expect, you try again with the next recId.

参数:

recId - Which possible key to recover.

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

message - Hash of the data that was signed.

返回:

An ECKey containing only the public part, or null if recovery wasn't possible.

signedMessageToKey

public static java.math.BigInteger signedMessageToKey(byte[] message,
                                                      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.

参数:

message - RLP encoded message.

signatureData - The message signature components

返回:

the public key used to sign the message

抛出:

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.

参数:

privKey - the private key to derive the public key from

返回:

BigInteger encoded public key