evm-blockchain-tools/dist/src/utils/aes-encryption.js

This is a collection of resuseable tools to support development for EVM-powered blockchains

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    var desc = Object.getOwnPropertyDescriptor(m, k);
    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
      desc = { enumerable: true, get: function() { return m[k]; } };
    }
    Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
    var ownKeys = function(o) {
        ownKeys = Object.getOwnPropertyNames || function (o) {
            var ar = [];
            for (var k in o) if (Object.prototype.hasOwnProperty.call(o, k)) ar[ar.length] = k;
            return ar;
        };
        return ownKeys(o);
    };
    return function (mod) {
        if (mod && mod.__esModule) return mod;
        var result = {};
        if (mod != null) for (var k = ownKeys(mod), i = 0; i < k.length; i++) if (k[i] !== "default") __createBinding(result, mod, k[i]);
        __setModuleDefault(result, mod);
        return result;
    };
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.genSalt = genSalt;
exports.encrypt = encrypt;
exports.decrypt = decrypt;
const crypto = __importStar(require("crypto"));
const algorithm = "aes-256-gcm";
const ivLength = 12;
const saltLength = 16;
function generateRandomBytes(length) {
    return crypto.randomBytes(length);
}
function getKeyFromPrivateString(privateString, realSalt) {
    return crypto.scryptSync(privateString, realSalt, 32);
}
function genSalt(length = saltLength) {
    return generateRandomBytes(length);
}
function encrypt(text, privateString) {
    const iv = generateRandomBytes(ivLength);
    const salt = genSalt();
    const key = getKeyFromPrivateString(privateString, salt);
    const cipher = crypto.createCipheriv(algorithm, key, iv);
    let encrypted = cipher.update(text, "utf8");
    encrypted = Buffer.concat([encrypted, cipher.final()]);
    const authTag = cipher.getAuthTag();
    const combined = Buffer.concat([iv, authTag, encrypted, salt]);
    return combined.toString("hex");
}
function decrypt(encryptedMessage, privateString) {
    try {
        const data = Buffer.from(encryptedMessage, "hex");
        const iv = data.subarray(0, ivLength);
        const authTag = data.subarray(ivLength, ivLength + 16);
        const salt = data.subarray(data.length - saltLength);
        const encryptedText = data.subarray(ivLength + 16, data.length - saltLength);
        const key = getKeyFromPrivateString(privateString, salt);
        const decipher = crypto.createDecipheriv(algorithm, key, iv);
        decipher.setAuthTag(authTag);
        let decrypted = decipher.update(encryptedText, undefined, "utf8");
        decrypted += decipher.final("utf8");
        return decrypted;
    }
    catch (error) {
        throw new Error(`failed to decrypt: ${error.message}`);
    }
}
//# sourceMappingURL=aes-encryption.js.map