zhouxianguang 4ff8c8d55d submit code 6 years ago
..
lib 4ff8c8d55d submit code 6 years ago
tst 4ff8c8d55d submit code 6 years ago
.npmignore 4ff8c8d55d submit code 6 years ago
.travis.yml 4ff8c8d55d submit code 6 years ago
LICENSE 4ff8c8d55d submit code 6 years ago
README.md 4ff8c8d55d submit code 6 years ago
package.json 4ff8c8d55d submit code 6 years ago

README.md

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.