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

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Preventing Signature Replication in Solana Using Native Ed25519 Applications

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

Why prevent signature replication?

Signature replication attacks occur when an attacker intercepts 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 operations without consequences.

Ed25519 Implementing Native Applications on Solana

To prevent signature replay, we will use the Solana-program library, which provides a native application implementation on the Solana blockchain. We will focus on creating a pre-instruction 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 your program ID
class SignatureReplayPreInstruction extends Program {
async getProgramData(programId: string): Promise {
const signature = 'your_signature_here'; // Replace with 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,
publicKey,
});
}
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 class `SignatureReplayPreInstruction'' that extends theProgram'' class. ThegetProgramData'' method returns a string containing the sender's signature, message, and public key.

Theexecute'' method checks if the received data starts withpre_instruction''. If so, it parses the data as JSON and writes the contents to the console.


Using pre_instructions in native Ed25519 programs

To use pre_instructions in a native Ed25519 program, you will need to modify thenativeScript'' function to extract the signature, message, and public key from the received data. Here is an example of how to do this:

“ typescript

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

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

const programId = ‘your_program_id’; // Replace 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,