refactor

src/crypto.rs

@@ -1,54 +0,0 @@
-use std::fmt;
-
-use aes::Aes128;
-use base64::{Engine as _, engine::general_purpose::STANDARD};
-use cbc::{
-    Decryptor,
-    cipher::{BlockDecryptMut, KeyIvInit, block_padding::Pkcs7},
-};
-
-type Aes128CbcDec = Decryptor<Aes128>;
-
-#[derive(Debug)]
-pub enum CryptoError {
-    Base64(base64::DecodeError),
-    Aes(cbc::cipher::InvalidLength),
-    Unpad(cbc::cipher::block_padding::UnpadError),
-}
-
-impl fmt::Display for CryptoError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            CryptoError::Base64(e) => write!(f, "Base64 decode failed: {}", e),
-            CryptoError::Aes(e) => write!(f, "AES decryption failed: {}", e),
-            CryptoError::Unpad(e) => write!(f, "PKCS7 unpadding failed: {}", e),
-        }
-    }
-}
-
-impl std::error::Error for CryptoError {}
-
-pub fn decrypt(ciphertext_b64: &str, key: &str, iv: &str) -> Result<String, CryptoError> {
-    // 1. Base64 decode the ciphertext
-    let ciphertext = STANDARD
-        .decode(ciphertext_b64)
-        .map_err(CryptoError::Base64)?;
-
-    // 2. Initialize AES-128 in CBC mode
-    let key_bytes = key.as_bytes();
-    let iv_bytes = iv.as_bytes();
-    let decryptor = Aes128CbcDec::new_from_slices(key_bytes, iv_bytes).map_err(CryptoError::Aes)?;
-
-    // 3. Decrypt the ciphertext, handling padding
-    let decrypted_len = ciphertext.len();
-    let mut plaintext = vec![0u8; decrypted_len];
-    let copy_len = ciphertext.len();
-    plaintext[..copy_len].copy_from_slice(&ciphertext);
-
-    let plaintext_slice = decryptor
-        .decrypt_padded_mut::<Pkcs7>(&mut plaintext[..decrypted_len])
-        .map_err(CryptoError::Unpad)?;
-
-    // 4. Convert plaintext to a UTF-8 string
-    Ok(String::from_utf8_lossy(plaintext_slice).to_string())
-}