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Ethereum Rubyで秘密鍵からアドレスを算出

2023/01/03に公開約900字
require 'ecdsa'
require 'keccak256'
require 'base16'

def calc(private_key)
  public_key = ECDSA::Group::Secp256k1.generator.multiply_by_scalar(private_key)
  xy = concat_xy(public_key)
  xy16 = Base16.decode16(xy.downcase)
  hexdigest = Digest::Keccak256.new.hexdigest(xy16)
  "0x#{hexdigest[-40..-1]}"
end

def concat_xy(public_key)
  x = public_key.x.to_s(16)
  y = public_key.y.to_s(16)
  x + y
end

private_key = 1
public_address = calc(private_key)
puts 'private_key: %064x' % private_key
puts "public_address: #{public_address}"

結果

private_key: 0000000000000000000000000000000000000000000000000000000000000001
public_address: 0x7e5f4552091a69125d5dfcb7b8c2659029395bdf

参考

https://www.etarou.work/posts/5084927/
https://github.com/evtaylor/keccak256
https://scrapbox.io/sushiether/Ruby_で_Ethereum_の秘密鍵・アドレスを生成

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