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Metamask: Public key encryption using metamask on solidity smart contract

12 February، 2025 CRYPTOCURRENCY

Metamask Integration in Solidity: Retrieve Encrypted Public Keys

As a developer working with decentralized applications (dApps) built on Ethereum, you are probably familiar with using MetaMask to secure your accounts. This article will look at how to integrate Metamask with a Solidity smart contract using public key cryptography.

What is public key cryptography?

Metamask: Public key encryption using metamask on solidity smart contract

Public key cryptography is a secure data transfer method in which sensitive information (in this case, an encrypted public key) is sent over a network without revealing the actual message. The recipient must have the private key to decrypt the data, making it virtually unbreakable.

Solidity and MetaMask Integration

To retrieve the encrypted public key stored on the blockchain using Metamask, we need to use the `ethGetRawTransaction’ method in Solidity. This feature allows us to retrieve raw transaction data from the Ethereum blockchain.

Here is a sample code snippet showing how to integrate Metamask with a Solidity smart contract:

pragma strength ^0.8.0;
import "
contract MySmartContract {
function getEncryptedPublicKey() public view return (string memory) {
// Create a new Ethereum account to retrieve transaction data
address account = 0x1234567890abcdef;
// Use the MetaMask JavaScript library to send a request to retrieve raw transaction data
string memory txHash = txUtils.getTxHash(account, "0x1234567890abcdef");
byte memory data = txUtils.getData(txHash);
bytes5[] memory keys = txUtils.getKeyArray(data);
// Create a new Ethereum account to decrypt the public key
address decryptAccount = 0x8765432109876543210abcdef;
// Use MetaMask's JavaScript library to send another request to retrieve the encrypted public key
string memory encryptedPublicKey = txUtils.getEncryptedPublicKey(decryptAccount, keys[1], data);
return encryptedPublicKey;
}
}

In this example code:

  • We create a new Ethereum account using the code “0x1234567890abcdef”.
  • We use the txUtils library to retrieve the raw transaction data from the blockchain.
  • We decrypt the encrypted public key by indexing it into the “keys” array at index 1 (since it will be decrypted for the second account).
  • We create another Ethereum account using the code “0x8765432109876543210abcdef”.
  • We use the txUtils library to retrieve the encrypted public key from this new account.

Get the Encrypted Public Keys

If you follow these steps, you should be able to retrieve the encrypted public keys stored on the blockchain using Metamask in a Solidity smart contract.

Important Notes:

*This is a basic example and may not cover all extreme cases. Test this code thoroughly in a development environment before deploying it.

  • Remember to store the private key securely as it will be used for decryption. Remember to follow best practices for storing sensitive data.

By integrating Metamask into your Solidity smart contract, you can provide users with secure access to their encrypted public keys while allowing them to manage their accounts on the blockchain.

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