Swift

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. Swift

func chilkatTest() {
    var success: Bool = false

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

    let cert = CkoCert()!

    // Load the cert and private key.
    success = cert.loadPfxFile(path: "qa_data/pfx/myCertAndKey.p12", password: "password")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    let crypt = CkoCrypt2()!

    success = crypt.setSigningCert(cert: cert)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // 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)
    var textToSign: String? = "This is the text to be hashed and signed."
    var sigBase64: String? = crypt.signStringENC(str: textToSign)
    if crypt.lastMethodSuccess != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("\(sigBase64!)")

    // The result:

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

    // If we want it in PEM format with just LF line-endings:
    let sb = CkoStringBuilder()!
    // Just LF line endings, not CRLF.
    var crlf: Bool = false
    sb.appendLine(str: "-----BEGIN PKCS7-----", crlf: crlf)
    sb.append(value: sigBase64)
    sb.appendLine(str: "-----END PKCS7-----", crlf: crlf)
    sb.toLF()

    // Save to a file.
    sb.writeFile(path: "c:/temp/qa_output/sig.pem", charset: "utf-8", emitBom: false)

    // Examine..
    print("\(sb.getAsString()!)")

    // Result is:

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

}