@opendatalabs/vana-sdk/dist/crypto/services/WalletKeyEncryptionService.js

A TypeScript library for interacting with Vana Network smart contracts.

import {
  processWalletPublicKey,
  processWalletPrivateKey,
  parseEncryptedDataBuffer
} from "../../utils/crypto-utils.js";
import { stringToBytes, bytesToString, toHex, fromHex, concat } from "viem";
class WalletKeyEncryptionService {
  eciesProvider;
  constructor(config) {
    this.eciesProvider = config.eciesProvider;
  }
  /**
   * Encrypts data using a wallet's public key.
   *
   * @param data - The plaintext message to encrypt for the wallet owner.
   * @param publicKey - The recipient wallet's public key for encryption.
   * @returns A promise that resolves to the encrypted data as a hex string.
   * @throws {Error} When encryption fails due to invalid key format.
   *
   * @example
   * ```typescript
   * const encrypted = await processor.encryptWithWalletPublicKey(
   *   "Secret message",
   *   "0x04..." // 65-byte uncompressed public key
   * );
   * console.log(`Encrypted: ${encrypted}`);
   * ```
   */
  async encryptWithWalletPublicKey(data, publicKey) {
    const publicKeyBytes = processWalletPublicKey(publicKey);
    const normalizedKey = this.eciesProvider.normalizeToUncompressed(publicKeyBytes);
    const dataBytes = stringToBytes(data);
    const encrypted = await this.eciesProvider.encrypt(
      normalizedKey,
      dataBytes
    );
    const result = concat([
      encrypted.iv,
      encrypted.ephemPublicKey,
      encrypted.ciphertext,
      encrypted.mac
    ]);
    return toHex(result).slice(2);
  }
  /**
   * Decrypts data using a wallet's private key.
   *
   * @param encryptedData - The hex-encoded encrypted data to decrypt.
   * @param privateKey - The wallet's private key for decryption.
   * @returns A promise that resolves to the decrypted plaintext message.
   * @throws {Error} When decryption fails due to invalid data or key format.
   *
   * @example
   * ```typescript
   * const decrypted = await processor.decryptWithWalletPrivateKey(
   *   encryptedHexString,
   *   "0x..." // 32-byte private key
   * );
   * console.log(`Decrypted: ${decrypted}`);
   * ```
   */
  async decryptWithWalletPrivateKey(encryptedData, privateKey) {
    const privateKeyBytes = processWalletPrivateKey(privateKey);
    const prefixedHex = encryptedData.startsWith("0x") ? encryptedData : `0x${encryptedData}`;
    const encryptedBytes = fromHex(prefixedHex, "bytes");
    const encrypted = parseEncryptedDataBuffer(encryptedBytes);
    const decrypted = await this.eciesProvider.decrypt(
      privateKeyBytes,
      encrypted
    );
    return bytesToString(decrypted);
  }
  /**
   * Encrypts a Uint8Array with a wallet public key
   *
   * @param data - Binary data to encrypt
   * @param publicKey - Public key as hex string or Uint8Array
   * @returns Encrypted data structure
   */
  async encryptBinary(data, publicKey) {
    const publicKeyBytes = processWalletPublicKey(publicKey);
    const normalizedKey = this.eciesProvider.normalizeToUncompressed(publicKeyBytes);
    return this.eciesProvider.encrypt(normalizedKey, data);
  }
  /**
   * Decrypts to a Uint8Array with a wallet private key
   *
   * @param encrypted - Encrypted data structure
   * @param privateKey - Private key as hex string or Uint8Array
   * @returns Decrypted binary data
   */
  async decryptBinary(encrypted, privateKey) {
    const privateKeyBytes = processWalletPrivateKey(privateKey);
    return this.eciesProvider.decrypt(privateKeyBytes, encrypted);
  }
  /**
   * Gets the underlying ECIES provider
   *
   * @returns The ECIES provider instance
   */
  getECIESProvider() {
    return this.eciesProvider;
  }
}
export {
  WalletKeyEncryptionService
};
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