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require 'openssl'
require 'optparse'
include OpenSSL
options = ARGV.getopts("c:k:r:")
cert_file = options["c"]
key_file = options["k"]
rcpt_file = options["r"]
cert = X509::Certificate.new(File::read(cert_file))
key = PKey::RSA.new(File::read(key_file))
data = "Content-Type: text/plain\r\n"
data << "\r\n"
data << "This is a clear-signed message.\r\n"
p7sig = PKCS7::sign(cert, key, data, [], PKCS7::DETACHED)
smime0 = PKCS7::write_smime(p7sig)
rcpt = X509::Certificate.new(File::read(rcpt_file))
p7enc = PKCS7::encrypt([rcpt], smime0)
print PKCS7::write_smime(p7enc)
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