# File lib/jwt.rb, line 177
  def raw_to_asn1(signature, private_key)
    byte_size = (private_key.group.degree + 7) / 8
    r = signature[0..(byte_size - 1)]
    s = signature[byte_size..-1]
    OpenSSL::ASN1::Sequence.new([r, s].map { |int| OpenSSL::ASN1::Integer.new(OpenSSL::BN.new(int, 2)) }).to_der
  end