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, the API we offer follows ZIP215. 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