feat: aes_gcm_decrypt

src/crypto.rs

@@ -1,3 +1,14 @@
+use aes_gcm_stream::Aes256GcmStreamDecryptor;
+use rust_util::{opt_result, XResult};
+
+pub fn aes_gcm_decrypt(key: &[u8], nonce: &[u8], message: &[u8]) -> XResult<Vec<u8>> {
+    let key: [u8; 32] = opt_result!(key.try_into(), "Invalid envelop: {}");
+    let mut aes256_gcm = Aes256GcmStreamDecryptor::new(key, nonce);
+    let mut b1 = aes256_gcm.update(message);
+    let b2 = opt_result!(aes256_gcm.finalize(), "Invalid envelop: {}");
+    b1.extend_from_slice(&b2);
+    Ok(b1)
+}
 
 #[test]
 fn test_aes_gcm_01() {