Package com.norswap.nanoeth.signature

Class SignatureUtils

java.lang.Object

com.norswap.nanoeth.signature.SignatureUtils

public final class SignatureUtils
extends Object

Signature-related utilities that don't obviously belong in other classes.

Method Summary

Modifier and Type	Method	Description
static Address	address(ECPoint publicKey)	Returns the address of the Ethereum account associated with the public key, which is formed by the 20 rightmost byte of the hash of the public key's encoding.
static Natural	canonicalizeS(Natural s)	Canonicalizes the s signature value if needed.

Methods inherited from class java.lang.Object

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

Method Details

address

public static Address address(ECPoint publicKey)

Returns the address of the Ethereum account associated with the public key, which is formed by the 20 rightmost byte of the hash of the public key's encoding.

canonicalizeS

public static Natural canonicalizeS(Natural s)

Canonicalizes the s signature value if needed.

Canonicalization is required because for every signature (r,s) the signature (r, -s (mod n)) is a valid signature of the same message. See signature package README for more information.

This change was introduced in EIP-2 (Homestead). We apply it to all transactions, since canonicalized transactions are valid before Homestead as well.