pub trait HmacSha1: CryptoClient {
fn hmacsha1_derive_key(
&mut self,
base_key: KeyId,
message: &[u8],
persistence: Location
) -> ClientResult<'_, DeriveKey, Self> { ... }
fn sign_hmacsha1<'c>(
&'c mut self,
key: KeyId,
message: &[u8]
) -> ClientResult<'c, Sign, Self> { ... }
}