PowerBuilder

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. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_Cert
oleobject loo_Crypt
string ls_TextToSign
string ls_SigBase64
oleobject loo_Sb
integer li_Crlf

li_Success = 0

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

loo_Cert = create oleobject
li_rc = loo_Cert.ConnectToNewObject("Chilkat.Cert")
if li_rc < 0 then
    destroy loo_Cert
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Load the cert and private key.
li_Success = loo_Cert.LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password")
if li_Success <> 1 then
    Write-Debug loo_Cert.LastErrorText
    destroy loo_Cert
    return
end if

loo_Crypt = create oleobject
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")

li_Success = loo_Crypt.SetSigningCert(loo_Cert)
if li_Success <> 1 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Cert
    destroy loo_Crypt
    return
end if

// Use SHA-256
loo_Crypt.HashAlgorithm = "sha256"

// Hash the utf-8 byte representation of the string
loo_Crypt.Charset = "utf-8"

// Return the result in base64
loo_Crypt.EncodingMode = "base64Mime"

// Sign some text to create a detached signature (i.e. a signature that does not include the signed data)
ls_TextToSign = "This is the text to be hashed and signed."
ls_SigBase64 = loo_Crypt.SignStringENC(ls_TextToSign)
if loo_Crypt.LastMethodSuccess <> 1 then
    Write-Debug loo_Crypt.LastErrorText
    destroy loo_Cert
    destroy loo_Crypt
    return
end if

Write-Debug ls_SigBase64

// The result:

// MIIWbgYJKoZIhvcNAQcCoIIWXzCCFlsCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
// ghMXMIIFuzCCA6OgAwIBAgIIVwoRl0LE48wwDQYJKoZIhvcNAQELBQAwazELMAkGA1UEBhMCSVQx
// ...
// ...

// If we want it in PEM format with just LF line-endings:
loo_Sb = create oleobject
li_rc = loo_Sb.ConnectToNewObject("Chilkat.StringBuilder")

// Just LF line endings, not CRLF.
li_Crlf = 0
loo_Sb.AppendLine("-----BEGIN PKCS7-----",li_Crlf)
loo_Sb.Append(ls_SigBase64)
loo_Sb.AppendLine("-----END PKCS7-----",li_Crlf)
loo_Sb.ToLF()

// Save to a file.
loo_Sb.WriteFile("c:/temp/qa_output/sig.pem","utf-8",0)

// Examine..
Write-Debug loo_Sb.GetAsString()

// Result is:

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


destroy loo_Cert
destroy loo_Crypt
destroy loo_Sb