33 lines
1.1 KiB
JavaScript
33 lines
1.1 KiB
JavaScript
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;(function () {
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'use strict';
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var createHash = require('create-hash');
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var pbkdf2 = require('pbkdf2');
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var aes = require('browserify-aes');
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exports.sha256 = function (buf) {
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var hash = createHash('sha256');
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hash.update(buf);
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hash.end();
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return Promise.resolve(hash.read());
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};
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exports.encrypt = function (data, password, salt, iv) {
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// Derived AES key is 128 bit, and the function takes a size in bytes.
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var aesKey = pbkdf2.pbkdf2Sync(password, Buffer(salt), 8192, 16, 'sha256');
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var cipher = aes.createCipheriv('aes-128-gcm', aesKey, Buffer(iv));
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var result = Buffer.concat([cipher.update(Buffer(data)), cipher.final(), cipher.getAuthTag()]);
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return Promise.resolve(result);
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};
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exports.decrypt = function (data, password, salt, iv) {
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var aesKey = pbkdf2.pbkdf2Sync(password, Buffer(salt), 8192, 16, 'sha256');
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var decipher = aes.createDecipheriv('aes-128-gcm', aesKey, Buffer(iv));
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decipher.setAuthTag(Buffer(data.slice(-16)));
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var result = Buffer.concat([decipher.update(Buffer(data.slice(0, -16))), decipher.final()]);
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return Promise.resolve(result);
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};
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}());
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