MIME S/MIME Signing Algorithm Properties

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Demonstrates the properties that control S/MIME signing: SigningAlg (the RSA signature scheme, PKCS1-V1_5 or RSASSA-PSS), SigningHashAlg (the message-digest algorithm), Micalg and Protocol (the micalg and protocol parameters of a multipart/signed Content-Type), and UseXPkcs7 (whether historical x-pkcs7 media-type names are used). The properties are configured before creating a detached signature.

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var mime = new chilkat.Mime();
    success = mime.SetBodyFromPlainText("This message will be signed.");
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    //  SigningAlg is the RSA signature scheme.  The default is PKCS1-V1_5; set RSASSA-PSS (or pss) for
    //  RSASSA-PSS.
    mime.SigningAlg = "PKCS1-V1_5";

    //  SigningHashAlg is the message-digest algorithm.  The default is sha256.
    mime.SigningHashAlg = "sha256";

    //  Micalg and Protocol are the micalg and protocol parameters written into a multipart/signed
    //  Content-Type header field.  They are normally set automatically, but can be controlled here.
    mime.Micalg = "sha-256";
    mime.Protocol = "application/pkcs7-signature";

    //  UseXPkcs7 controls whether newly created S/MIME media types use the historical x-pkcs7 names.
    mime.UseXPkcs7 = false;

    //  Load a signing certificate (with private key access) from a PFX.  The PFX password should come
    //  from a secure source rather than being hard-coded.
    var pfxPassword = "myPfxPassword";
    var cert = new chilkat.Cert();
    success = cert.LoadPfxFile("qa_data/signer.pfx",pfxPassword);
    if (success == false) {
        console.log(cert.LastErrorText);
        return;
    }

    //  Create the detached signature using the algorithms configured above.
    success = mime.AddDetachedSignature(cert);
    if (success == false) {
        console.log(mime.LastErrorText);
        return;
    }

    console.log("Signed with SigningAlg=" + mime.SigningAlg + " SigningHashAlg=" + mime.SigningHashAlg);

}

chilkatExample();