I've wrote a simple script to sign and verify some text and generate a
PKCS7 using OpenSSL.

  require 'openssl'
  include OpenSSL

  data = 'abcdefghijklmnsopqrstuvwxyz\n'

  cert = X509::Certificate.new( File::read("my_cert.pem") )
  prv_key = PKey::RSA.new( File::read("key_prv.pem") )

  store = X509::Store.new
  store.add_cert(cert)

  #gen sign
  p7 = PKCS7.sign(cert,prv_key,data)

  #verify sign
  puts "verified: #{p7.verify([cert],store,data,0)}"

executed, the result is:

  verified: true

but changing the data variable from sigle quoted to double quoted:

  data = "abcdefghijklmnsopqrstuvwxyz\n"

the answer is:

  verified: false

i know that escaped characters are treated diferently within double
quoted strings, but i sign and verify the same data in both cases.
┬┐what's happen?


this is the content of the file 'my_cert.pem'
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

and 'prv_key.pem'
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

Thanks
jfglez

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