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Creating a CPI (Programming Interface) for Signature Verification on the Solana Chain with Native ed25519
Introduction
As a Solana developer, you are probably familiar with the Solana programming language and its extensive libraries. However, when it comes to working with specific cryptographic primitives, such as ed25519, things can get interesting. In this article, we will look at how to create a CPI (Programming Interface) for Solana’s native ed25519 programs.
What is ed25519?
ed25519 is a public-key cryptosystem designed by Dave Dossner and Eric Silverberg. It is a key pair that consists of two components: a private key and a public key. The private key is used to sign messages, while the public key is used to verify signatures.
Native ed25519 program on Solana
Unfortunately, according to the Solana program bin documentation, native ed25519 programs cannot be called by programs. This means that you cannot use a programmatic interface to interact directly with native ed25519 programs.
Creating a CPI for a native ed25519 program
To overcome this limitation, we can create a CPI (Programmatic Interface) using the “solana-program-cpi” bin. This bin provides the ability to define and call custom programs on the Solana blockchain.
Here is an example of how you can create a CPI to verify signatures on the chain:
use solana_program::{
account_info::{next_account_info, AccountInfo},
program_error::ProgramError,
pubkey::Pubkey,
};
const SIGNATURE_TYPE: &str = "ed25519";
struct Ed25519SignatureVerifier {
private_key: Pubkey,
}
impl Ed25519SignatureVerifier {
fn new(private_key: Pubkey) -> Self {
Ed25519SignatureVerifier { private_key }
}
fn verify(&self, signature: &AccountInfo, program_id: &Pubkey) -> Result {
// Get the public key from the account info
let public_key = next_account_info(signature).pubkey.clone();
// Verify the signature with the ed25519 algorithm
match ed25519::verify(&public_key, &signature.value.data().as_ref()) {
OK(verified) => OK(SIGNATURE_TYPE.to_string()),
Err(_) => Err(ProgramError::InvalidSignature),
}
}
}
fn main() -> Result<(), ProgramError> {
// Create a new program ID
let program_id = Pubkey::new_unique("your_program_id");
// Get the private key of an account
let private_key = Pubkey::new_unique("your_private_key");
// Create an Ed25519SignatureVerifier instance with the private key
let verifier = Ed25519SignatureVerifier::new(private_key);
// Verify signature on chain using CPI
match verifier.verify(&AccountInfo { pubkey: next_account_info(Pubkey::new(unique_identifier!())) }, program_id) {
Ok(signature_type) => println!("Verified signature type: {}", signature_type),
Err(_) => println!("Invalid signature"),
}
Ok(())
}
In this example, we define a structure “Ed25519SignatureVerifier” that takes a private key as input. We then use CPI to verify the signature on chain using the function “ed25519::verify”.
Note that this code assumes that the Cargo.toml' file has the necessary dependencies:
[dependencies]
solana-program = "1.8.0"
solana-program-cpi = "0.12.2"
Conclusion
In summary, creating a CPI to verify Solana chain signatures with native ed25519 is possible using the `solana-program-cpi” bin. This allows for programmatic interaction with native ed25519 programs without relying on callable programs.
I hope this article was helpful! If you have any questions or need further assistance, please contact me.