Xojo Plugin

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. Xojo Plugin

Dim success As Boolean
success = False

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

Dim cert As New Chilkat.Cert

// Load the cert and private key.
success = cert.LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password")
If (success <> True) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

Dim crypt As New Chilkat.Crypt2

success = crypt.SetSigningCert(cert)
If (success <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

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

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

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

// Sign some text to create a detached signature (i.e. a signature that does not include the signed data)
Dim textToSign As String
textToSign = "This is the text to be hashed and signed."
Dim sigBase64 As String
sigBase64 = crypt.SignStringENC(textToSign)
If (crypt.LastMethodSuccess <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

System.DebugLog(sigBase64)

// The result:

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

// If we want it in PEM format with just LF line-endings:
Dim sb As New Chilkat.StringBuilder
// Just LF line endings, not CRLF.
Dim crlf As Boolean
crlf = False
success = sb.AppendLine("-----BEGIN PKCS7-----",crlf)
success = sb.Append(sigBase64)
success = sb.AppendLine("-----END PKCS7-----",crlf)
success = sb.ToLF()

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

// Examine..
System.DebugLog(sb.GetAsString())

// Result is:

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