removed unnecessary conversions (#180)

* removed unnecessary conversions

src/crypto/ecdsa.rs

@@ -34,5 +34,5 @@ pub fn sign(
     let signing_key = signature::EcdsaKeyPair::from_pkcs8(alg, key)?;
     let rng = rand::SystemRandom::new();
     let out = signing_key.sign(&rng, message)?;
-    Ok(b64_encode(out.as_ref()))
+    Ok(b64_encode(out))
 }

src/crypto/eddsa.rs

@@ -19,5 +19,5 @@ pub(crate) fn alg_to_ec_verification(alg: Algorithm) -> &'static signature::EdDS
 pub fn sign(key: &[u8], message: &[u8]) -> Result<String> {
     let signing_key = signature::Ed25519KeyPair::from_pkcs8_maybe_unchecked(key)?;
     let out = signing_key.sign(message);
-    Ok(b64_encode(out.as_ref()))
+    Ok(b64_encode(out))
 }

src/crypto/mod.rs

@@ -15,7 +15,7 @@ pub(crate) mod rsa;
 /// Could be in its own file to match RSA/EC but it's 2 lines...
 pub(crate) fn sign_hmac(alg: hmac::Algorithm, key: &[u8], message: &[u8]) -> String {
     let digest = hmac::sign(&hmac::Key::new(alg, key), message);
-    b64_encode(digest.as_ref())
+    b64_encode(digest)
 }
 
 /// Take the payload of a JWT, sign it using the algorithm given and return

src/crypto/rsa.rs

@@ -45,7 +45,7 @@ pub(crate) fn sign(
     let rng = rand::SystemRandom::new();
     key_pair.sign(alg, &rng, message, &mut signature).map_err(|_| ErrorKind::RsaFailedSigning)?;
 
-    Ok(b64_encode(&signature))
+    Ok(b64_encode(signature))
 }
 
 /// Checks that a signature is valid based on the (n, e) RSA pubkey components

src/encoding.rs

@@ -114,10 +114,10 @@ pub fn encode<T: Serialize>(header: &Header, claims: &T, key: &EncodingKey) -> R
     if key.family != header.alg.family() {
         return Err(new_error(ErrorKind::InvalidAlgorithm));
     }
-    let encoded_header = b64_encode_part(&header)?;
-    let encoded_claims = b64_encode_part(&claims)?;
-    let message = [encoded_header.as_ref(), encoded_claims.as_ref()].join(".");
-    let signature = crypto::sign(&*message.as_bytes(), key, header.alg)?;
+    let encoded_header = b64_encode_part(header)?;
+    let encoded_claims = b64_encode_part(claims)?;
+    let message = [encoded_header, encoded_claims].join(".");
+    let signature = crypto::sign(message.as_bytes(), key, header.alg)?;
 
     Ok([message, signature].join("."))
 }

src/header.rs

@@ -65,11 +65,9 @@ impl Header {
     }
 
     /// Converts an encoded part into the Header struct if possible
-    pub(crate) fn from_encoded(encoded_part: &str) -> Result<Self> {
+    pub(crate) fn from_encoded<T: AsRef<[u8]>>(encoded_part: T) -> Result<Self> {
         let decoded = b64_decode(encoded_part)?;
-        let s = String::from_utf8(decoded)?;
-
-        Ok(serde_json::from_str(&s)?)
+        Ok(serde_json::from_slice(&decoded)?)
     }
 }
 

src/serialization.rs

@@ -1,32 +1,32 @@
 use serde::de::DeserializeOwned;
 use serde::ser::Serialize;
 use serde_json::map::Map;
-use serde_json::{from_str, to_string, Value};
+use serde_json::{from_slice, to_vec, Value};
 
 use crate::errors::Result;
 
-pub(crate) fn b64_encode(input: &[u8]) -> String {
+pub(crate) fn b64_encode<T: AsRef<[u8]>>(input: T) -> String {
     base64::encode_config(input, base64::URL_SAFE_NO_PAD)
 }
 
-pub(crate) fn b64_decode(input: &str) -> Result<Vec<u8>> {
+pub(crate) fn b64_decode<T: AsRef<[u8]>>(input: T) -> Result<Vec<u8>> {
     base64::decode_config(input, base64::URL_SAFE_NO_PAD).map_err(|e| e.into())
 }
 
 /// Serializes a struct to JSON and encodes it in base64
 pub(crate) fn b64_encode_part<T: Serialize>(input: &T) -> Result<String> {
-    let json = to_string(input)?;
-    Ok(b64_encode(json.as_bytes()))
+    let json = to_vec(input)?;
+    Ok(b64_encode(json))
 }
 
 /// Decodes from base64 and deserializes from JSON to a struct AND a hashmap of Value so we can
 /// run validation on it
-pub(crate) fn from_jwt_part_claims<B: AsRef<str>, T: DeserializeOwned>(
+pub(crate) fn from_jwt_part_claims<B: AsRef<[u8]>, T: DeserializeOwned>(
     encoded: B,
 ) -> Result<(T, Map<String, Value>)> {
-    let s = String::from_utf8(b64_decode(encoded.as_ref())?)?;
+    let s = b64_decode(encoded)?;
 
-    let claims: T = from_str(&s)?;
-    let validation_map: Map<_, _> = from_str(&s)?;
+    let claims: T = from_slice(&s)?;
+    let validation_map: Map<_, _> = from_slice(&s)?;
     Ok((claims, validation_map))
 }