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Solana: Can I make a CPI to native ed25519 Program to verify a signature on chain?

Published by Terlumun Aondover on February 11th, 2025.

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Creation of a CPI (programmatic interface) to check the signature on the Solana channel with the native program ED25519

Introduction

As a Solana developer, you probably know the Solana programming language and its vast libraries. However, when it comes to working with specific cryptographic primitives such as ED25519, things can become interesting. In this article, we will explore how to create a CPI (programmatic interface) for native Ed25519 programs on Solana.

** What is an Ed25519 program?

ED25519 is a type of public crypto-key system designed by Dave Dossner and Eric Silverberg. It is a pair of keys made up of two components: the private key and the public key. The private key is used to sign messages, while the public key can be used to check the signatures.

Ed25519 native program on Solana

Unfortunately, in accordance with the Chata Documentation of the Solana program, the native ED25519 programs are not integrated by the programs. This means that you can use a programmatic interface to interact directly with native ED25519 programs.

Creation of a CPI for the native program Ed25519

Solana: Can I make a CPI to native ed25519 Program to verify a signature on chain?

To overcome this limitation, we can create a CPI (programmatic interface) using the Caisse Solana-Pogram CPI. This cash register provides a way to define and invoke personalized programs on the Solana blockchain.

Here is an example of how to create a CPI to check a signature on the chain:

`Rest



Use Solana_Program :: {{

    account_info :: {next_account_info, account information},

    Program_error :: Program,

    Pubkey :: Pubkey,

};

Finding_type: & Str = "Ed25519";

Struct ed25519SignureVerify {

    Private_Key: Pubkey,

}

Imp Ed25519Signureverierier {

    Fn new (private_key: pubkey) -> self {

        ED25519SIGNUREVIERRIFIF {private_key}

    }

    FN VERIFY (& Self, Signature: & Accountinfo , Program_id: & Pubkey) -> Result  {{

        // get the public key from account information

        Selt Public_Key = Next_account_info (Signature) .pubkey.clone ();

        // Check the signature using the ED25519 algorithm

        Match Ed25519 :: Verify (& public_key, & signature.value.data (). As_ref ()) {

            OK (verified) => OK (signature_type.to_string ()),

            Err (_) => Err (Programror :: InvalidSignature),

        }

    }

}

FN Main () -> Result  {

    // Create a new program ID

    Let programlet_id = pubkey :: new_unique ("my_programm_id");

    // Get the private key to an account

    Leave private_key = pubkey :: new_unique ("my_private_key");

    // Create an Ed25519SignureVerifier Instance with the private key

    Pay verifier = ed25519signurevierrifier :: new (private_key);

    // Check a signature on the chain using the IPC

    Match verifier.Verify (& Dentininfo {pubkey: next_account_info (pubkey :: new (unique_idify! ())}, Program_id) {{{{{{{{{{{{{{{{

        OK (signature_type) => Println!

        Err (_) => Println!

    }

    ALL RIGHT(())

}

'

In this example, we define a structureED25519SIGNUREVIER ‘which takes a private key as a starter. We then use the CPI to check a signature on the chain using the function “ED25519 :: Check”.

Note that this code assumes that you have the necessary dependencies in your file cargo.tom

Toml



[Dependencies]

Solana Program = "1.8.0"

Solana-Programm CPI = "0.12.2"

'



 Conclusion

In conclusion, the creation of a CPI to check the signature on the Solana channel with the native Ed25519 program is possible using the CaisseSolanna Program CPi`. This allows you to interact with the native ED25519 programs by program without counting on invoked programs.

I hope this article has useful bones! Let me know if you have any questions or if you need additional help.