Rust

Ed25519ph Sign and Verify

See more Ed25519 Examples

Demonstrates how to create an Ed25519ph signature, and then to verify it.

Note: This example requires Chilkat v9.5.0.91 or greater.

Rust

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Use the following test vector from https://www.rfc-editor.org/rfc/rfc8032#page-30

//    -----TEST abc
// 
//    ALGORITHM:
//    Ed25519ph
// 
//    SECRET KEY:
//    833fe62409237b9d62ec77587520911e
//    9a759cec1d19755b7da901b96dca3d42
// 
//    PUBLIC KEY:
//    ec172b93ad5e563bf4932c70e1245034
//    c35467ef2efd4d64ebf819683467e2bf
// 
//    MESSAGE (length 3 bytes):
//    616263
// 
//    SIGNATURE:
//    98a70222f0b8121aa9d30f813d683f80
//    9e462b469c7ff87639499bb94e6dae41
//    31f85042463c2a355a2003d062adf5aa
//    a10b8c61e636062aaad11c2a26083406

let priv_key_hex = "833fe62409237b9d62ec77587520911e9a759cec1d19755b7da901b96dca3d42".to_string();
let pub_key_hex = "ec172b93ad5e563bf4932c70e1245034c35467ef2efd4d64ebf819683467e2bf".to_string();

let priv_key = chilkat::PrivateKey::new();
if priv_key.load_ed25519(&priv_key_hex, &pub_key_hex).is_err() {
    println!("{}", priv_key.last_error_text());
    return;
}

// The data to be signed...
let bd = chilkat::BinData::new();
let _ = bd.append_encoded("616263", "hex");

let eddsa = chilkat::EdDSA::new();
// Indicate we want the Ed25519ph instance.
eddsa.set_algorithm("Ed25519ph");

let hex_sig = eddsa.sign_bd_enc(&bd, "hexlower", &priv_key).unwrap_or_default();

println!("signature = {}", hex_sig);

// The expected output is: 98a70222f0b8121aa9d30f813d683f80....

// Verify the signature..
let pub_key = chilkat::PublicKey::new();
if pub_key.load_ed25519(&pub_key_hex).is_err() {
    println!("{}", pub_key.last_error_text());
    return;
}

if eddsa.verify_bd_enc(&bd, &hex_sig, "hexlower", &pub_key).is_err() {
    println!("{}", eddsa.last_error_text());
    println!("Failed to verify the signature.");
    return;
}

println!("The Ed25519ph signature is verified!");