DuckCorp » CyborgHood

content_type == "multipart/signed" and parts.size == 2 and

parts[1].content_type == "application/pgp-signature"

GPGME.verify(sig, content) do |signature|

def is_pgp_encrypted?

content_type == "multipart/encrypted" and parts.size == 2 and

parts[0].content_type == "application/pgp-encrypted" and

parts[1].content_type == "application/octet-stream"

end

def pgp_crypt_info

return nil unless is_pgp_encrypted?

a = parts[0].body.split("\n").collect{|l| l.chomp.split(": ") if l =~ /: / }.compact.flatten

Hash[*a]

end

def pgp_encrypted_part

return nil unless is_pgp_encrypted?

parts[1].body

end

def decrypt(&passphrase_callback)

return nil unless is_pgp_encrypted?

protocol_version = pgp_crypt_info()["Version"].to_i

raise NotImplementedError, "pgp-encrypted protocol version #{protocol_version} is not implemented" unless protocol_version == 1

encrypted_data = pgp_encrypted_part()

passphrase_callback_wrapper = Proc.new do |hook, uid_hint, passphrase_info, prev_was_bad, fd|

# sending key

io = IO.for_fd(fd, 'w')

io.puts hook.call(uid_hint, passphrase_info, prev_was_bad)

io.flush

end

GPGME.decrypt(encrypted_data, {:passphrase_callback => passphrase_callback_wrapper, :passphrase_callback_value => passphrase_callback, :textmode => true})

end