diff --git a/src/aes128gcm.rs b/src/aes128gcm.rs
index a5bd9c2..0795955 100644
--- a/src/aes128gcm.rs
+++ b/src/aes128gcm.rs
@@ -9,15 +9,17 @@ use error::*;
 
 const ECE_AES128GCM_MIN_RS: u32 = 18;
 const ECE_AES128GCM_HEADER_LENGTH: usize = 21;
-//const ECE_AES128GCM_MAX_KEY_ID_LENGTH: usize = 255;
+// The max AES128GCM Key ID Length is 255 octets. We use far less of that because we use
+// the "key_id" to store the exchanged public key since we don't cache the key_ids.
+// Code fails if the key_id is not a public key length field.
 const ECE_AES128GCM_PAD_SIZE: usize = 1;
 
-const ECE_WEBPUSH_AES128GCM_IKM_INFO_PREFIX: &'static str = "WebPush: info\0";
+const ECE_WEBPUSH_AES128GCM_IKM_INFO_PREFIX: &str = "WebPush: info\0";
 const ECE_WEBPUSH_AES128GCM_IKM_INFO_LENGTH: usize = 144; // 14 (prefix len) + 65 (pub key len) * 2;
 
 const ECE_WEBPUSH_IKM_LENGTH: usize = 32;
-const ECE_AES128GCM_KEY_INFO: &'static str = "Content-Encoding: aes128gcm\0";
-const ECE_AES128GCM_NONCE_INFO: &'static str = "Content-Encoding: nonce\0";
+const ECE_AES128GCM_KEY_INFO: &str = "Content-Encoding: aes128gcm\0";
+const ECE_AES128GCM_NONCE_INFO: &str = "Content-Encoding: nonce\0";
 
 // TODO: When done, remove the aes128gcm prefixes and the EC_ ones.
 // As for now it makes it easier to Ctrl + F into ecec :)
diff --git a/src/aesgcm.rs b/src/aesgcm.rs
index 009a60e..dc0c075 100644
--- a/src/aesgcm.rs
+++ b/src/aesgcm.rs
@@ -21,10 +21,9 @@ use error::{ErrorKind, Result};
 
 const ECE_AESGCM_PAD_SIZE: usize = 2;
 
-const ECE_WEBPUSH_AESGCM_KEYPAIR_LENGTH: usize = 134; // (2 + 65) * 2
-const ECE_WEBPUSH_AESGCM_AUTHINFO: &'static str = "Content-Encoding: auth\0";
+const ECE_WEBPUSH_AESGCM_KEYPAIR_LENGTH: usize = 134; // (2 + Raw Key Length) * 2
+const ECE_WEBPUSH_AESGCM_AUTHINFO: &str = "Content-Encoding: auth\0";
 
-// const ECE_WEBPUSH_DEFAULT_RS: u32 = 4096;
 // a DER prefixed key is "\04" + ECE_WEBPUSH_RAW_KEY_LENGTH
 const ECE_WEBPUSH_RAW_KEY_LENGTH: usize = 65;
 const ECE_WEBPUSH_IKM_LENGTH: usize = 32;
@@ -52,8 +51,8 @@ impl AesGcmEncryptedBlock {
         ciphertext: Vec<u8>,
     ) -> Result<AesGcmEncryptedBlock> {
         Ok(AesGcmEncryptedBlock {
-            dh: dh.clone(),
-            salt: salt.clone(),
+            dh: dh.to_owned(),
+            salt: salt.to_owned(),
             rs: Self::aesgcm_rs(rs),
             ciphertext,
         })
@@ -147,7 +146,7 @@ where
             plaintext,
         )?;
         Ok(AesGcmEncryptedBlock {
-            salt: salt,
+            salt,
             dh: raw_local_pub_key,
             rs: params.rs,
             ciphertext,
diff --git a/src/common.rs b/src/common.rs
index 0366058..0d868d3 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -74,7 +74,7 @@ pub trait EceWebPush {
         if salt.len() != ECE_SALT_LENGTH {
             return Err(ErrorKind::InvalidSalt.into());
         }
-        if plaintext.len() == 0 {
+        if plaintext.is_empty() {
             return Err(ErrorKind::ZeroPlaintext.into());
         }
         let (key, nonce) = Self::derive_key_and_nonce(
@@ -169,7 +169,7 @@ pub trait EceWebPush {
         if salt.len() != ECE_SALT_LENGTH {
             return Err(ErrorKind::InvalidSalt.into());
         }
-        if ciphertext.len() == 0 {
+        if ciphertext.is_empty() {
             return Err(ErrorKind::ZeroCiphertext.into());
         }
         if Self::needs_trailer(rs, ciphertext.len()) {
@@ -235,11 +235,11 @@ pub fn ece_min_block_pad_length(pad_len: usize, max_block_len: usize) -> usize {
         // the padding first.
         block_pad_len += 1;
     }
-    return if block_pad_len > pad_len {
+    if block_pad_len > pad_len {
         pad_len
     } else {
         block_pad_len
-    };
+    }
 }
 
 /// Generates a 96-bit IV, 48 bits of which are populated.
diff --git a/src/lib.rs b/src/lib.rs
index 11f4058..66fe773 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,6 @@ extern crate base64;
 extern crate byteorder;
 extern crate ece_crypto;
 extern crate failure;
-// #[macro_use]
 extern crate failure_derive;
 
 mod aes128gcm;
@@ -30,6 +29,7 @@ pub type Aes128GcmEceWebPush = aes128gcm::Aes128GcmEceWebPush<
     ece_crypto_openssl::OpenSSLCrypto,
 >;
 
+#[cfg(feature = "openssl")]
 pub type AesGcmEceWebPush = aesgcm::AesGcmEceWebPush<
     OpenSSLLocalKeyPair,
     OpenSSLRemotePublicKey,