Solana: How to prevent signature replay when using Ed25519 Native Program

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Preventing Solana from Recreating Subtitles Using Native Ed25519 Programs

When using native Ed25519 in Solana to verify message signatures, it is necessary to implement measures to prevent replay attacks. A common technique is to add a preamble containing the signature, message, and the sender’s public key. In this article, we will discuss how to achieve this security feature in your custom program.

Why prevent subtitles from being replayed?

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

Implementing Native Programs Ed25519 in Solana

To prevent signature replay, we will use the Solana-program library, which provides a native program implementation on the Solana blockchain. We will focus on creating an initial declaration that contains the signature, message, and the sender’s public key.

Here is an example of how to create an introductory 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 = '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(Pre-instruction received 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 the sender’s public key.

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

Using the preamble in native Ed25519 programs

To use the preamble in a native Ed25519 program, you 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:

«`typed

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 the actual message

const publicKey = ‘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 preInstructionData = data.substring(9);

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

console.

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