use pre-allocated vecs for tag/nonce

Author: G8XSU

src/util/storable_builder.rs

@@ -26,19 +26,21 @@ impl StorableBuilder {
 	/// [`PutObjectRequest`]: crate::types::PutObjectRequest
 	pub fn build(&self, input: Vec<u8>, version: i64) -> Storable {
 		let mut rng = ThreadRng::default();
-		let mut nonce = [0u8; 12];
+		let mut nonce = Vec::with_capacity(12);
+		nonce.resize(12, 0u8);
 		rng.fill_bytes(&mut nonce[4..]);
 
 		let mut data_blob = PlaintextBlob { value: input, version }.encode_to_vec();
 
 		let mut cipher = ChaCha20Poly1305::new(&self.data_encryption_key, &nonce, &[]);
-		let mut tag = [0u8; 16];
+		let mut tag = Vec::with_capacity(16);
+		tag.resize(16, 0u8);
 		cipher.encrypt_inplace(&mut data_blob, &mut tag);
 		Storable {
 			data: data_blob,
 			encryption_metadata: Some(EncryptionMetadata {
-				nonce: Vec::from(nonce),
-				tag: Vec::from(tag),
+				nonce,
+				tag,
 				cipher_format: CHACHA20_CIPHER_NAME.to_string(),
 			}),
 		}