module Ethereum::Secp256k1

Constants

A
B
G
Gx
Gy
N
P

Elliptic curve parameters

Public Class Methods

priv_to_pub(priv) click to toggle source
# File lib/ethereum/secp256k1.rb, line 20
def priv_to_pub(priv)
  priv = PrivateKey.new(priv)
  privkey = ::Secp256k1::PrivateKey.new privkey: priv.encode(:bin), raw: true
  pubkey = privkey.pubkey
  PublicKey.new(pubkey.serialize).encode(priv.format)
end
recover_pubkey(msg, vrs, compressed: false) click to toggle source
# File lib/ethereum/secp256k1.rb, line 48
def recover_pubkey(msg, vrs, compressed: false)
  pk = ::Secp256k1::PublicKey.new(flags: ::Secp256k1::ALL_FLAGS)
  sig = Utils.zpad_int(vrs[1]) + Utils.zpad_int(vrs[2])
  recsig = pk.ecdsa_recoverable_deserialize(sig, vrs[0]-27)
  pk.public_key = pk.ecdsa_recover msg, recsig, raw: true
  pk.serialize compressed: compressed
end
recoverable_sign(msg, privkey) click to toggle source
# File lib/ethereum/secp256k1.rb, line 27
def recoverable_sign(msg, privkey)
  pk = ::Secp256k1::PrivateKey.new privkey: privkey, raw: true
  signature = pk.ecdsa_recoverable_serialize pk.ecdsa_sign_recoverable(msg, raw: true)

  v = signature[1] + 27
  r = Utils.big_endian_to_int signature[0][0,32]
  s = Utils.big_endian_to_int signature[0][32,32]

  [v,r,s]
end
signature_verify(msg, vrs, pubkey) click to toggle source
# File lib/ethereum/secp256k1.rb, line 38
def signature_verify(msg, vrs, pubkey)
  pk = ::Secp256k1::PublicKey.new(pubkey: pubkey)
  raw_sig = Utils.zpad_int(vrs[1]) + Utils.zpad_int(vrs[2])

  sig = ::Secp256k1::C::ECDSASignature.new
  sig[:data].to_ptr.write_bytes(raw_sig)

  pk.ecdsa_verify(msg, sig)
end