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66 lines
2.2 KiB
66 lines
2.2 KiB
3 years ago
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'use strict';
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var crypto = require('crypto');
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var Encryptor = {
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/**
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* Calculate a hash of the concatenated buffers with the given algorithm.
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* @param {string} algorithm - The hash algorithm.
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* @returns {Buffer} The hash
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*/
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hash: function hash(algorithm) {
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var hash = crypto.createHash(algorithm);
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for (var _len = arguments.length, buffers = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
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buffers[_key - 1] = arguments[_key];
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}
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hash.update(Buffer.concat(buffers));
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return hash.digest();
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},
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/**
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* Convert a password into an encryption key
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* @param {string} password - The password
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* @param {string} hashAlgorithm - The hash algoritm
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* @param {string} saltValue - The salt value
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* @param {number} spinCount - The spin count
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* @param {number} keyBits - The length of the key in bits
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* @param {Buffer} blockKey - The block key
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* @returns {Buffer} The encryption key
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*/
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convertPasswordToHash: function convertPasswordToHash(password, hashAlgorithm, saltValue, spinCount) {
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hashAlgorithm = hashAlgorithm.toLowerCase();
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var hashes = crypto.getHashes();
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if (hashes.indexOf(hashAlgorithm) < 0) {
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throw new Error("Hash algorithm '".concat(hashAlgorithm, "' not supported!"));
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} // Password must be in unicode buffer
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var passwordBuffer = Buffer.from(password, 'utf16le'); // Generate the initial hash
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var key = this.hash(hashAlgorithm, Buffer.from(saltValue, 'base64'), passwordBuffer); // Now regenerate until spin count
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for (var i = 0; i < spinCount; i++) {
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var iterator = Buffer.alloc(4); // this is the 'special' element of Excel password hashing
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// that stops us from using crypto.pbkdf2()
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iterator.writeUInt32LE(i, 0);
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key = this.hash(hashAlgorithm, key, iterator);
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}
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return key.toString('base64');
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},
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/**
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* Generates cryptographically strong pseudo-random data.
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* @param size The size argument is a number indicating the number of bytes to generate.
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*/
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randomBytes: function randomBytes(size) {
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return crypto.randomBytes(size);
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}
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};
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module.exports = Encryptor;
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//# sourceMappingURL=encryptor.js.map
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