83 lines
2.2 KiB
Markdown
83 lines
2.2 KiB
Markdown
# Bluecrypt ASN.1 Packer
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An ASN.1 builder in less than 100 lines of Vanilla JavaScript,
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part of the Bluecrypt suite.
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<br>
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<small>(< 150 with newlines and comments)</small>
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# Features
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| <100 lines of code | <1k gzipped | 1.8k minified | 3.3k with comments |
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* [x] Complete ASN.1 packer
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* [x] Parses x.509 certificates
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* [x] PEM (base64-encoded DER)
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* [x] VanillaJS, Zero Dependencies
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* [x] Browsers (even old ones)
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* [x] Online [Demo](https://coolaj86.com/demos/asn1-packer/)
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* [ ] Node.js (built, publishing soon)
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# Demo
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<https://coolaj86.com/demos/asn1-packer/>
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<img border="1" src="https://i.imgur.com/phGeuMw.png" />
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# Usage
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```html
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<script src="https://git.coolaj86.com/coolaj86/asn1-packer.js/raw/branch/master/asn1-packer.js"></script>
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```
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```js
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'use strict';
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var ASN1 = window.ASN1 // 62 lines
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var Enc = window.Enc // 27 lines
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var PEM = window.PEM // 6 lines
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var arr = [
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0x30,
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[
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[ 0x30, [ [ 0x06, "2a8648ce3d0201" ], [ 0x06, "2a8648ce3d030107" ] ] ],
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[ 0x03, "04213d5258bc6c69c3e2139675ea3928a409fcffef39acc8e0c82a24ae78c37ede98fd89c0e00e74c997bb0a716ca9e0dca673dbb9b3fa72962255c9debcd218ca" ]
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]
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];
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var hex = ASN1.pack(arr);
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var buf = Enc.hexToBuf(hex);
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var pem = PEM.packBlock({ type: "PUBLIC KEY", bytes: buf });
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console.log(pem);
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```
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```
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-----BEGIN PUBLIC KEY-----
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MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEIT1SWLxsacPiE5Z16jkopAn8/+85
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rMjgyCokrnjDft6Y/YnA4A50yZe7CnFsqeDcpnPbubP6cpYiVcnevNIYyg==
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-----END PUBLIC KEY-----
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```
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### Simple Packing
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All types are handled by the same rules except for Integer (0x02)
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and Bit String (0x03), which require special padding.
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This is sufficient for RSA and EC keypairs, and CSRs.
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I don't know of any format for which it is not sufficient,
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but if you find one I'd like to know about it.
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### Zero Dependencies
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> A little copying is better than a little dependency - Golang Proverbs by Rob Pike
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Rather than requiring hundreds (or thousands) of lines of dependencies,
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this library takes the approach of including from other libraries in its suite
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to produce a small, focused file that does exactly what it needs to do.
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# Legal
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[Bluecrypt VanillaJS ASN.1 Packer](https://git.coolaj86.com/coolaj86/asn1-packer.js) |
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MPL-2.0
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