ASN1.toObject

[microshine]

Propose to add new functionality. Add feature allows to convert ASN structure in Javascript object using given schema.

Extension = {
    type: "SEQUENCE",
    value: {
        typeId: {type: "OBJECT ITDENTIFIER"},
        value: {type: "ANY"}
    }
}

var asn = ANS1.decode(data);
var o = asn.toObject(Extension);

// structure of 'o'
{
    typeId: "1.2.3.4.5.6",
    value: [18, 3, 1, 1, 0]
}

[lapo-luchini]

Sorry, I don't understand what is happening there… what are type and typeId and value used for exactly? How is the parameter formatted?

[microshine]

ASN1 structure SEQUENCE (2 elem) OBJECT IDENTIFIER 2.5.29.37   OCTET STRING (1 elem) SEQUENCE (2 elem) OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2   OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.4 This is data of X509 Extension (RFC 5280)

Extension ::= SEQUENCE { extnID OBJECT IDENTIFIER, critical BOOLEAN DEFAULT FALSE, extnValue OCTET STRING -- contains the DER encoding of an ASN.1 value -- corresponding to the extension type identified -- by extnID } JavaScript schema

schemas.Extension = {     type: "SEQUENCE",    // ASN1 type of element     value: {                           // ASN1 element value or structure         extnID: {             type: "OBJECT IDENTIFIER" // it's not got a prop value because it's a simple ASN1 type         },         critical:{              type: "BOOLEAN",              default: false,              optional: true // because critical has  'default '         },         extnValue: {             type: "OCTET STRING"         }     } }

JavaScrip code

asn.toObject(schemas.Extension)

return value of function is

{     extnID: "2.5.29.37",     crytical: false,     extnValue: Uint8Array[...] }

Среда, 22 апреля 2015, 7:06 -07:00 от Lapo Luchini [email protected]:

Sorry, I don't understand what is happening there… what are type and typeId and value used for exactly? How is the parameter formatted? — Reply to this email directly or view it on GitHub .

[email protected]

[lapo-luchini]

Ah ok, you mean parsing an ASN.1 format definition file and decoding using named structures instead of anonymous ASN.1 structures? That's not so fast to do and isn't a feature I need, so I don't think I will implement that anytime soon. But as you say it can be done as a post-processing on the current output from ASN1.decode(array), so if anyone feels like implementing it, I would certainly consider pull requests.

[microshine]

I wrote simple ASN1Schema JavaScript code. It has got only one method 'get'. I sent source code of my library to your email. Can you examinate it and tell me ypur oppinin. If you'd like it I can help you to write ASN1.toObject method.

Среда, 22 апреля 2015, 8:12 -07:00 от Lapo Luchini [email protected]:

Ah ok, you mean parsing an ASN.1 format definition file and decoding using named structures instead of anonymous ASN.1 structures? That's not so fast to do and isn't a feature I need, so I don't think I will implement that anytime soon. But as you say it can be done as a post-processing on the current output from ASN1.decode(array), so if anyone feels like implementing it, I would certainly consider pull requests. — Reply to this email directly or view it on GitHub . [email protected]

[lapo-luchini]

@microshine I'm so sorry! This was good stuff, but at the time I was too stressed to think about it and then I totally forgot about this issue. :(

I started coding this feature myself a few days ago, using a different approach (parsing BNF definitions directly out of RFC sources).

I'll work on integrating that with the parser next.