remove pkcs8 file loading functions (#208)

Author: Geal

biscuit-auth/src/crypto/mod.rs

@@ -16,8 +16,6 @@ use ed25519_dalek::*;
 
 use nom::Finish;
 use rand_core::{CryptoRng, RngCore};
-#[cfg(feature = "pem")]
-use std::path::Path;
 use std::{convert::TryInto, fmt::Display, hash::Hash, ops::Drop, str::FromStr};
 use zeroize::Zeroize;
 
@@ -58,20 +56,6 @@ impl KeyPair {
         Ok(KeyPair { kp })
     }
 
-    #[cfg(feature = "pem")]
-    pub fn from_private_key_der_file(path: impl AsRef<Path>) -> Result<Self, error::Format> {
-        let kp = SigningKey::read_pkcs8_der_file(path)
-            .map_err(|e| error::Format::InvalidKey(e.to_string()))?;
-        Ok(KeyPair { kp })
-    }
-
-    #[cfg(feature = "pem")]
-    pub fn from_private_key_pem_file(path: impl AsRef<Path>) -> Result<Self, error::Format> {
-        let kp = SigningKey::read_pkcs8_pem_file(path)
-            .map_err(|e| error::Format::InvalidKey(e.to_string()))?;
-        Ok(KeyPair { kp })
-    }
-
     pub fn private(&self) -> PrivateKey {
         let secret = self.kp.to_bytes();
         PrivateKey(secret)