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[6a3a178] | 1 | node-asn1 is a library for encoding and decoding ASN.1 datatypes in pure JS.
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| 2 | Currently BER encoding is supported; at some point I'll likely have to do DER.
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| 3 |
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| 4 | ## Usage
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| 5 |
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| 6 | Mostly, if you're *actually* needing to read and write ASN.1, you probably don't
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| 7 | need this readme to explain what and why. If you have no idea what ASN.1 is,
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| 8 | see this: ftp://ftp.rsa.com/pub/pkcs/ascii/layman.asc
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| 9 |
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| 10 | The source is pretty much self-explanatory, and has read/write methods for the
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| 11 | common types out there.
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| 12 |
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| 13 | ### Decoding
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| 14 |
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| 15 | The following reads an ASN.1 sequence with a boolean.
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| 16 |
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| 17 | var Ber = require('asn1').Ber;
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| 18 |
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| 19 | var reader = new Ber.Reader(Buffer.from([0x30, 0x03, 0x01, 0x01, 0xff]));
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| 20 |
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| 21 | reader.readSequence();
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| 22 | console.log('Sequence len: ' + reader.length);
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| 23 | if (reader.peek() === Ber.Boolean)
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| 24 | console.log(reader.readBoolean());
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| 25 |
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| 26 | ### Encoding
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| 27 |
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| 28 | The following generates the same payload as above.
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| 29 |
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| 30 | var Ber = require('asn1').Ber;
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| 31 |
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| 32 | var writer = new Ber.Writer();
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| 33 |
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| 34 | writer.startSequence();
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| 35 | writer.writeBoolean(true);
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| 36 | writer.endSequence();
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| 37 |
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| 38 | console.log(writer.buffer);
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| 39 |
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| 40 | ## Installation
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| 41 |
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| 42 | npm install asn1
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| 43 |
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| 44 | ## License
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| 45 |
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| 46 | MIT.
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| 47 |
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| 48 | ## Bugs
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| 49 |
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| 50 | See <https://github.com/joyent/node-asn1/issues>.
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