Indefinite length in BER encoding for PKCS#7

[tysonite]

As per RFC 2315, various PKCS#7 content types shall be encoded using indefinite length form. Right now, it is not possible to choose such type of BER length encoding. For instance, PKCS#7 objects created by the library (with enveloped-data) can't be decoded by Microsoft Outlook (S/MIME format) because of that.

Here is the code used to create PKCS#7:

    // create a p7 enveloped message
    var p7 = forge.pkcs7.createEnvelopedData();

    // add recipient's certificate
    p7.addRecipient(cert);
    
    // set content
    p7.content = forge.util.createBuffer();
    p7.content.putString(content);

    // encrypt
    p7.encrypt();

    // get DER bytes (!!!Definite length form is used!!!)
    forge.asn1.toDer(p7.toAsn1()).getBytes();

I expect that forge.asn1.toDer generates DER data with indefinite length form.