Ed25519

CosmWasm offers an API to verify and batch verify Ed25519 signatures. This is powerful, especially since batch verifications require a random component which is impossible to implement in contract code.

Ed25519 is known to have issues with inconsistent validation criteria (opens in a new tab), the API we offer follows ZIP215 (opens in a new tab). This means you will have no issues with signatures being valid in one place and invalid in another.

Example

contract.rs

#[cfg_attr(not(feature = "library"), entry_point)]
pub fn query(
    deps: Deps,
    _env: Env,
    msg: Ed25519VerifyMsg,
) -> StdResult<QueryResponse> {
    let public_key = msg.public_key;
    let signature = msg.signature;
    let message = msg.message;
 
    // Verify the signature. On chain!
    let is_valid = deps.api.ed25519_verify(&message, &signature, &public_key)?;
    let response = to_json_binary(&VerifyResponse {
        is_valid
    })?;
 
    Ok(response)
}

Cryptography P-256