38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
/* jslint node: true */
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'use strict';
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const createHash = require('crypto').createHash;
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exports.createNamedUUID = createNamedUUID;
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function createNamedUUID(namespaceUuid, key) {
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//
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// v5 UUID generation code based on the work here:
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// https://github.com/download13/uuidv5/blob/master/uuid.js
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//
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if(!Buffer.isBuffer(namespaceUuid)) {
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namespaceUuid = Buffer.from(namespaceUuid);
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}
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if(!Buffer.isBuffer(key)) {
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key = Buffer.from(key);
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}
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let digest = createHash('sha1').update(
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Buffer.concat( [ namespaceUuid, key ] )).digest();
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let u = Buffer.alloc(16);
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// bbbb - bb - bb - bb - bbbbbb
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digest.copy(u, 0, 0, 4); // time_low
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digest.copy(u, 4, 4, 6); // time_mid
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digest.copy(u, 6, 6, 8); // time_hi_and_version
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u[6] = (u[6] & 0x0f) | 0x50; // version, 4 most significant bits are set to version 5 (0101)
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u[8] = (digest[8] & 0x3f) | 0x80; // clock_seq_hi_and_reserved, 2msb are set to 10
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u[9] = digest[9];
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digest.copy(u, 10, 10, 16);
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return u;
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} |