ecc_160.rb

# derived from http://h2np.net/tips/wiki/index.php?RubyOpenSSLDigitalSignatureSample

require 'openssl'
require 'base64'
include OpenSSL

group_name = 'secp160k1'
message = 'test payload aa'

puts "=== Generate Key ==="
key = PKey::EC.new(group_name)
key = key.generate_key
#puts key.to_text
puts "Private Key: #{key.private_key.to_bn}"

puts "Public Key: #{key.public_key.to_bn}"

# payload set to base 64 format
digest = Digest::SHA512.digest(message)
# digest
puts "Base64 format of Payload: #{Base64.encode64 digest}"

signature = key.dsa_sign_asn1 digest
puts "Signature: #{Base64.encode64 signature}"


puts "\n\n\n=== Verification ==="
group = PKey::EC::Group.new(group_name)

# generate base on public key
point = PKey::EC::Point.new(group, key.public_key.to_bn)
verifier = PKey::EC.new(group)

#verifier = key
verifier.private_key = nil # we don't know the private key
verifier.public_key = point
#puts 'verify key'
puts "Verify using public key: #{verifier.public_key.to_bn}"
puts "Verify Result: #{verifier.dsa_verify_asn1(digest, signature).inspect}"