Solana: How to prevent signature duplication using Ed25519 native program

05 Feb Solana: How to prevent signature duplication using Ed25519 native program

Preventing Resubscription in Solana with Ed25519 Native Programs

When using the Ed25519 native program on Solana to verify message signatures, it is essential to implement measures to prevent replay attacks. A common technique is to add a pre-statement that contains the signature, message, and the sender’s public key. In this article, we will explore how to achieve this security feature in our custom program.

Why prevent re-subscription?

Signature replay attacks occur when an attacker intercepts and reuses a previously verified signature. This could be devastating for Solana-based systems, as it allows attackers to impersonate legitimate users and execute malicious transactions without consequences.

Implementing the Ed25519 Native Programs on Solana

To avoid re-signing, we will use the Solana-program library, which provides a native implementation of the program on the Solana blockchain. Let’s focus on creating a pre-statement that contains the signature, message, and the sender’s public key.

Here is an example of how to create a pre-instruction using TypeScript:

import { Program } from '@solana-program/spl-program';
import { solanaProgram } from '../src';
const programId = 'your_program_id'; // Replace with your program ID
class SignatureReplayPreInstruction extends Program {
async getProgramData(programId: string): Promise {
const signature = 'your_signature_here'; // Replace with the actual signature
const message = 'your_message_here'; // Replace with the actual message
const publicKey = 'your_public_key_here'; // Replace with the actual public key
return JSON.stringify({
signature,
message,
public_key,
});
}
async execute(programId: string, data: string): Promise {
if (data.startsWith('pre_instruction')) {
const preInstruction = JSON.parse(data.substring(9));
console.log(Received prepath with signature ${preInstruction.signature}, message ${preInstruction.message} and public key ${preInstruction.publicKey});
}
}
}
// Initialize the program
const program = new solanaProgram(programId, SignatureReplayPreInstruction);

In this example, we define a SignatureReplayPreInstruction class that extends the Program class. The getProgramData method returns a string containing the signature, message, and public key of the sender.

The execute method checks if the received data starts with ‘pre_instruction’. If this happens, it parses the data as JSON and writes the contents to the console.

Using preinstructions in native Ed25519 programs

To use preinstructions in native Ed25519 programs, you will need to modify the nativeScript function to extract the signature, message, and public key from the received data. Here is an example of how to do it:

“`typescript

import { Program } from ‘@solana-program/spl-program’;

import { ed25519NativeScript } from ‘../src’;

const programId = ‘your_program_id’; // Replace with your program ID

class SignatureReplayPreInstruction extends Program {

async getProgramData(programId: string): Promise {

const signature = ‘your_signature_here’; // Replace with the actual signature

const message = ‘your_message_here’; // Replace with actual message

const publicKey = ‘your_public_key_here’; // Replace with actual public key

return JSON.stringify({

signature,

message,

public key,

});

}

async execute(programId: string, data: string): Promise {

if (data.startsWith(‘pre_instruction’)) {

const preInstructionData = data.substring(9);

const [signature, message, public key] = preInstructionData.split(‘,’);

console.