iocane/dist/node/adapter.js

Textual encryption library

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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Object.defineProperty(exports, "__esModule", { value: true });
exports.createAdapter = void 0;
var encryption_1 = require("./encryption");
var derivation_1 = require("./derivation");
var textPacking_1 = require("../shared/textPacking");
var dataPacking_1 = require("./dataPacking");
var stream_1 = require("./stream");
var symbols_1 = require("../symbols");
var types_1 = require("../types");
function createAdapter() {
    var adapter = {
        algorithm: symbols_1.ALGO_DEFAULT,
        createDecryptStream: function (password) { return (0, stream_1.createDecryptStream)(adapter, password); },
        createEncryptStream: function (password) { return (0, stream_1.createEncryptStream)(adapter, password); },
        decrypt: function (encrypted, password) { return decrypt(adapter, encrypted, password); },
        decryptCBC: encryption_1.decryptCBC,
        decryptGCM: encryption_1.decryptGCM,
        derivationRounds: symbols_1.DERIVED_KEY_ITERATIONS,
        deriveKey: function (password, salt) { return deriveKey(adapter, password, salt); },
        encrypt: function (text, password) { return encrypt(adapter, text, password); },
        encryptCBC: encryption_1.encryptCBC,
        encryptGCM: encryption_1.encryptGCM,
        generateIV: encryption_1.generateIV,
        generateSalt: encryption_1.generateSalt,
        packData: dataPacking_1.packEncryptedData,
        packText: textPacking_1.packEncryptedText,
        setAlgorithm: function (algo) {
            adapter.algorithm = algo;
            return adapter;
        },
        setDerivationRounds: function (rounds) {
            adapter.derivationRounds = rounds;
            return adapter;
        },
        unpackData: dataPacking_1.unpackEncryptedData,
        unpackText: textPacking_1.unpackEncryptedText
    };
    return adapter;
}
exports.createAdapter = createAdapter;
function decrypt(adapter, encrypted, password) {
    return __awaiter(this, void 0, void 0, function () {
        var encryptedComponents, salt, rounds, method, decryptData, keyDerivationInfo;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    encryptedComponents = typeof encrypted === "string"
                        ? adapter.unpackText(encrypted)
                        : adapter.unpackData(encrypted);
                    salt = encryptedComponents.salt, rounds = encryptedComponents.rounds, method = encryptedComponents.method;
                    decryptData = getDecryptionMethod(adapter, method);
                    adapter.algorithm = method;
                    adapter.derivationRounds = rounds;
                    return [4 /*yield*/, adapter.deriveKey(password, salt)];
                case 1:
                    keyDerivationInfo = _a.sent();
                    return [2 /*return*/, decryptData(encryptedComponents, keyDerivationInfo)];
            }
        });
    });
}
function deriveKey(adapter, password, salt) {
    return __awaiter(this, void 0, void 0, function () {
        var algorithm, derivationRounds;
        return __generator(this, function (_a) {
            algorithm = adapter.algorithm, derivationRounds = adapter.derivationRounds;
            return [2 /*return*/, (0, derivation_1.deriveKeyFromPassword)(password, salt, derivationRounds, hmacKeyRequired(algorithm))];
        });
    });
}
function encrypt(adapter, text, password) {
    return __awaiter(this, void 0, void 0, function () {
        var algorithm, encryptData, salt, _a, keyDerivationInfo, iv, encryptedComponents;
        return __generator(this, function (_b) {
            switch (_b.label) {
                case 0:
                    algorithm = adapter.algorithm;
                    encryptData = getEncryptionMethod(adapter, algorithm);
                    return [4 /*yield*/, adapter.generateSalt(symbols_1.SALT_LENGTH)];
                case 1:
                    salt = _b.sent();
                    return [4 /*yield*/, Promise.all([
                            adapter.deriveKey(password, salt),
                            adapter.generateIV()
                        ])];
                case 2:
                    _a = _b.sent(), keyDerivationInfo = _a[0], iv = _a[1];
                    return [4 /*yield*/, encryptData(text, keyDerivationInfo, iv)];
                case 3:
                    encryptedComponents = _b.sent();
                    return [2 /*return*/, typeof text === "string"
                            ? adapter.packText(encryptedComponents)
                            : adapter.packData(encryptedComponents)];
            }
        });
    });
}
function getDecryptionMethod(adapter, algo) {
    if (algo === types_1.EncryptionAlgorithm.CBC) {
        return adapter.decryptCBC;
    }
    else if (algo === types_1.EncryptionAlgorithm.GCM) {
        return adapter.decryptGCM;
    }
    throw new Error("Invalid algorithm: ".concat(algo));
}
function getEncryptionMethod(adapter, algo) {
    if (algo === types_1.EncryptionAlgorithm.CBC) {
        return adapter.encryptCBC;
    }
    else if (algo === types_1.EncryptionAlgorithm.GCM) {
        return adapter.encryptGCM;
    }
    throw new Error("Invalid algorithm: ".concat(algo));
}
function hmacKeyRequired(algo) {
    return algo === types_1.EncryptionAlgorithm.GCM ? false : true;
}