Ruby

Create PEM-encoded PKCS#7 Detached Signature

See more Digital Signatures Examples

Demonstrates how to create a PKCS7 PEM-encoded object containing a detached signature. Ruby

require 'chilkat'

success = false

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

cert = Chilkat::CkCert.new()

# Load the cert and private key.
success = cert.LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password")
if (success != true)
    print cert.lastErrorText() + "\n";
    exit
end

crypt = Chilkat::CkCrypt2.new()

success = crypt.SetSigningCert(cert)
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

# Use SHA-256
crypt.put_HashAlgorithm("sha256")

# Hash the utf-8 byte representation of the string
crypt.put_Charset("utf-8")

# Return the result in base64
crypt.put_EncodingMode("base64Mime")

# Sign some text to create a detached signature (i.e. a signature that does not include the signed data)
textToSign = "This is the text to be hashed and signed."
sigBase64 = crypt.signStringENC(textToSign)
if (crypt.get_LastMethodSuccess() != true)
    print crypt.lastErrorText() + "\n";
    exit
end

print sigBase64 + "\n";

# The result:

# MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
# ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
# ...
# ...

# If we want it in PEM format with just LF line-endings:
sb = Chilkat::CkStringBuilder.new()
# Just LF line endings, not CRLF.
crlf = false
sb.AppendLine("-----BEGIN PKCS7-----",crlf)
sb.Append(sigBase64)
sb.AppendLine("-----END PKCS7-----",crlf)
sb.ToLF()

# Save to a file.
sb.WriteFile("c:/temp/qa_output/sig.pem","utf-8",false)

# Examine..
print sb.getAsString() + "\n";

# Result is:

# -----BEGIN PKCS7-----
# MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
# ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
# DjAMBgNVBAcMBU1pbGFuMSMwIQYDVQQKDBpBY3RhbGlzIFMucC5BLi8wMzM1ODUyMDk2NzEnMCUG
# A1UEAwweQWN0YWxpcyBBdXRoZW50aWNhdGlvbiBSb290IENBMB4XDTExMDkyMjExMjIwMloXDTMw
# MDkyMjExMjIwMlowazELMAkGA1UEBhMCSVQxDjAMBgNVBAcMBU1pbGFuMSMwIQYDVQQKDBpBY3Rh
# bGlzIFMucC5BLi8wMzM1ODUyMDk2NzEnMCUGA1UEAwweQWN0YWxpcyBBdXRoZW50aWNhdGlvbiBS
# b290IENBMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAp8bEpSmkLO/lGMWwUKNvUTuf
# ClrJwkg4CsIcoBh/kbWHuUA/3R1oHwiD1S0eiKD4j1aPbZkCkpAW1V8IbInX4ay8IMKx4INRimlN
# AJZaby/ARH6jDuSRzVju3PvHHkVH3Se5CAGfpiEd9UEtL0z9KK3giq0itFZljoZUj5NDKd45Rnij
# MCO6zfB9E1fAXdKDa0hMxKufgFpbOr3JpyI/gCczWw63igxdBzcIy2zSekciRDXFzMwujt0q7bd9
# ...
# ...
# -----END PKCS7-----