51 lines
1.2 KiB
Markdown
51 lines
1.2 KiB
Markdown
|
node-asn1 is a library for encoding and decoding ASN.1 datatypes in pure JS.
|
||
|
|
Currently BER encoding is supported; at some point I'll likely have to do DER.
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
Mostly, if you're *actually* needing to read and write ASN.1, you probably don't
|
||
|
|
need this readme to explain what and why. If you have no idea what ASN.1 is,
|
||
|
|
see this: ftp://ftp.rsa.com/pub/pkcs/ascii/layman.asc
|
||
|
|
|
||
|
|
The source is pretty much self-explanatory, and has read/write methods for the
|
||
|
|
common types out there.
|
||
|
|
|
||
|
|
### Decoding
|
||
|
|
|
||
|
|
The following reads an ASN.1 sequence with a boolean.
|
||
|
|
|
||
|
|
var Ber = require('asn1').Ber;
|
||
|
|
|
||
|
|
var reader = new Ber.Reader(new Buffer([0x30, 0x03, 0x01, 0x01, 0xff]));
|
||
|
|
|
||
|
|
reader.readSequence();
|
||
|
|
console.log('Sequence len: ' + reader.length);
|
||
|
|
if (reader.peek() === Ber.Boolean)
|
||
|
|
console.log(reader.readBoolean());
|
||
|
|
|
||
|
|
### Encoding
|
||
|
|
|
||
|
|
The following generates the same payload as above.
|
||
|
|
|
||
|
|
var Ber = require('asn1').Ber;
|
||
|
|
|
||
|
|
var writer = new Ber.Writer();
|
||
|
|
|
||
|
|
writer.startSequence();
|
||
|
|
writer.writeBoolean(true);
|
||
|
|
writer.endSequence();
|
||
|
|
|
||
|
|
console.log(writer.buffer);
|
||
|
|
|
||
|
|
## Installation
|
||
|
|
|
||
|
|
npm install asn1
|
||
|
|
|
||
|
|
## License
|
||
|
|
|
||
|
|
MIT.
|
||
|
|
|
||
|
|
## Bugs
|
||
|
|
|
||
|
|
See <https://github.com/mcavage/node-asn1/issues>.
|