add missing keypair functions

Author: sdbondi

identity/src/keypair.rs

@@ -147,6 +147,11 @@ impl Keypair {
         self.try_into()
     }
 
+    #[cfg(feature = "sr25519")]
+    pub fn try_into_sr25519(self) -> Result<sr25519::Keypair, OtherVariantError> {
+        self.try_into()
+    }
+
     #[cfg(feature = "secp256k1")]
     pub fn try_into_secp256k1(self) -> Result<secp256k1::Keypair, OtherVariantError> {
         self.try_into()

identity/src/sr25519.rs

@@ -200,6 +200,10 @@ impl SecretKey {
         Ok(SecretKey(secret))
     }
 
+    pub fn inner_key(&self) -> &RistrettoSecretKey {
+        &self.0
+    }
+
     // Not great, leaves the secret key in stack memory (all key types not just Sr25519)
     pub(crate) fn to_bytes(&self) -> [u8; 32] {
         let mut buf = [0u8; 32];