Macro sp_application_crypto::app_crypto_signature_common

macro_rules! app_crypto_signature_common {
    ($sig:ty, $key_type:expr) => { ... };
}

Declares Signature type which is functionally equivalent to $sig, but is new Application-specific type whose identifier is $key_type. For full functionality, app_crypto_public_(not)_full_crypto! must be called too.