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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