@cruxpay/js-sdk/lib/packages/encryption.js

CruxPay Javascript SDK

var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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        step((generator = generator.apply(thisArg, _arguments || [])).next());
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};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
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            switch (op[0]) {
                case 0: case 1: t = op; break;
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                case 5: _.label++; y = op[1]; op = [0]; continue;
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    }
};
import * as ncrypto from "crypto";
import { ErrorHelper, PackageErrorCode } from "./error";
var typedArrayToBuffer = function (array) {
    return array.buffer.slice(array.byteOffset, array.byteLength + array.byteOffset);
};
var Encryption = /** @class */ (function () {
    function Encryption() {
    }
    Encryption.hash = function (value) {
        var valueUtf8 = Buffer.from(value, "UTF-8");
        var hash = ncrypto.createHash("sha256");
        hash.update(valueUtf8);
        return hash.digest("hex");
    };
    Encryption.encryptJSON = function (jsonObj, password) { return __awaiter(void 0, void 0, void 0, function () {
        var plainText;
        return __generator(this, function (_a) {
            plainText = JSON.stringify(jsonObj);
            return [2 /*return*/, Encryption.encryptText(plainText, password)];
        });
    }); };
    Encryption.decryptJSON = function (ctBufferBase64, ivBase64, password) { return __awaiter(void 0, void 0, void 0, function () {
        var JSONString;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0: return [4 /*yield*/, Encryption.decryptText(ctBufferBase64, ivBase64, password)];
                case 1:
                    JSONString = _a.sent();
                    return [2 /*return*/, JSON.parse(JSONString)];
            }
        });
    }); };
    Encryption.encryptText = function (plainText, password) { return __awaiter(void 0, void 0, void 0, function () {
        var ptUtf8, pwUtf8, encrypt, hash, pwHash, iv;
        return __generator(this, function (_a) {
            ptUtf8 = Buffer.from(plainText, "UTF-8");
            pwUtf8 = Buffer.from(password, "UTF-8");
            encrypt = function (text, eiv, ekey) {
                var cipher = ncrypto.createCipheriv("aes-256-gcm", Buffer.from(ekey), Buffer.from(eiv));
                var encrypted = cipher.update(text);
                encrypted = Buffer.concat([encrypted, cipher.final(), cipher.getAuthTag()]);
                return { iv: Buffer.from(eiv).toString("base64"), encBuffer: encrypted.toString("base64") };
            };
            hash = ncrypto.createHash("sha256");
            hash.update(pwUtf8);
            pwHash = typedArrayToBuffer(hash.digest());
            iv = crypto.getRandomValues(new Uint8Array(12));
            return [2 /*return*/, encrypt(ptUtf8, iv, pwHash)];
        });
    }); };
    Encryption.decryptText = function (ctBufferBase64, ivBase64, password) { return __awaiter(void 0, void 0, void 0, function () {
        var ctBuffer, iv, pwUtf8, hash, pwHash, decrypt, ptBuffer;
        return __generator(this, function (_a) {
            ctBuffer = Buffer.from(ctBufferBase64, "base64");
            iv = Buffer.from(ivBase64, "base64");
            pwUtf8 = Buffer.from(password);
            hash = ncrypto.createHash("sha256");
            hash.update(pwUtf8);
            pwHash = typedArrayToBuffer(hash.digest());
            decrypt = function (buffer, eiv, ekey, tagLength) {
                var decipher = ncrypto.createDecipheriv("aes-256-gcm", Buffer.from(ekey), eiv);
                var tag = buffer.slice(buffer.byteLength - tagLength);
                var text = buffer.slice(0, buffer.byteLength - tagLength);
                decipher.setAuthTag(tag);
                return Buffer.concat([decipher.update(text), decipher.final()]);
            };
            try {
                ptBuffer = decrypt(ctBuffer, iv, pwHash, 16);
            }
            catch (err) {
                if (err instanceof DOMException) {
                    throw ErrorHelper.getPackageError(err, PackageErrorCode.DecryptionFailed);
                }
                throw err;
            }
            return [2 /*return*/, ptBuffer.toString()];
        });
    }); };
    return Encryption;
}());
export { Encryption };