mirror of
https://github.com/balena-io/open-balena.git
synced 2024-12-19 05:37:52 +00:00
80 lines
2.3 KiB
JavaScript
80 lines
2.3 KiB
JavaScript
'use strict';
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var crypto = require('crypto');
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var fs = require('fs');
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var base32 = (function() {
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// Extracted from https://github.com/chrisumbel/thirty-two
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// to avoid having to install packages for this script.
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var charTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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var byteTable = [
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0xff, 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
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0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
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0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
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0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff
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];
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function quintetCount(buff) {
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var quintets = Math.floor(buff.length / 5);
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return buff.length % 5 == 0 ? quintets: quintets + 1;
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}
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return function(plain) {
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if (!Buffer.isBuffer(plain)) {
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plain = new Buffer(plain);
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}
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var i = 0;
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var j = 0;
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var shiftIndex = 0;
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var digit = 0;
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var encoded = new Buffer(quintetCount(plain) * 8);
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/* byte by byte isn't as pretty as quintet by quintet but tests a bit
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faster. will have to revisit. */
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while(i < plain.length) {
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var current = plain[i];
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if(shiftIndex > 3) {
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digit = current & (0xff >> shiftIndex);
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shiftIndex = (shiftIndex + 5) % 8;
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digit = (digit << shiftIndex) | ((i + 1 < plain.length) ?
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plain[i + 1] : 0) >> (8 - shiftIndex);
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i++;
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} else {
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digit = (current >> (8 - (shiftIndex + 5))) & 0x1f;
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shiftIndex = (shiftIndex + 5) % 8;
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if(shiftIndex == 0) i++;
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}
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encoded[j] = charTable.charCodeAt(digit);
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j++;
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}
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for (i = j; i < encoded.length; i++) {
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encoded[i] = 0x3d; //'='.charCodeAt(0)
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}
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return encoded;
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}
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})();
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function joseKeyId(der) {
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var hasher = crypto.createHash('sha256');
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hasher.update(der);
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var b32 = base32(hasher.digest().slice(0, 30)).toString('ascii');
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var chunks = [];
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for (var i = 0; i < b32.length; i += 4) {
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chunks.push(b32.substr(i, 4));
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}
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return chunks.join(':');
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}
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var derFilePath = process.argv[2];
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var der = fs.readFileSync(derFilePath);
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process.stdout.write(joseKeyId(der));
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