Go

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. Go

    success := false

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

    cert := chilkat.NewCert()

    // Load the cert and private key.
    success = cert.LoadPfxFile("qa_data/pfx/myCertAndKey.p12","password")
    if success != true {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        return
    }

    crypt := chilkat.NewCrypt2()

    success = crypt.SetSigningCert(cert)
    if success != true {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        crypt.DisposeCrypt2()
        return
    }

    // Use SHA-256
    crypt.SetHashAlgorithm("sha256")

    // Hash the utf-8 byte representation of the string
    crypt.SetCharset("utf-8")

    // Return the result in base64
    crypt.SetEncodingMode("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.LastMethodSuccess() != true {
        fmt.Println(crypt.LastErrorText())
        cert.DisposeCert()
        crypt.DisposeCrypt2()
        return
    }

    fmt.Println(*sigBase64)

    // The result:

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

    // If we want it in PEM format with just LF line-endings:
    sb := chilkat.NewStringBuilder()
    // 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..
    fmt.Println(*sb.GetAsString())

    // Result is:

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

    cert.DisposeCert()
    crypt.DisposeCrypt2()
    sb.DisposeStringBuilder()