Add decrypt file logic and test with a sample file

Author: WebDevCaptain

src/main.rs

@@ -6,10 +6,17 @@ use std::{
 };
 
 fn main() {
+ let encrypted_file_path = "sample-file.txt.encrypted";
+
  encrypt_file(
  "sample-file.txt",
  "password12345678password12345678".as_bytes(),
  );
+
+ decrypt_file(
+ encrypted_file_path,
+ "password12345678password12345678".as_bytes(),
+ );
 }
 
 type Aes256Cbc = Cbc<Aes256, Pkcs7>;
@@ -29,6 +36,23 @@ fn encrypt_file(file_path: &str, key: &[u8]) {
  output_file
  .write_all(&cipher_text)
  .expect("Failed to write encrypted data to the output file");
+}
+
+fn decrypt_file(file_path: &str, key: &[u8]) {
+ let encrypted_content = fs::read(file_path).expect("Failed to read the encrypted file");
+
+ let iv = [0u8; 16];
 
- println!("IV: {:?}", iv);
+ let cipher = Aes256Cbc::new_from_slices(key, &iv).expect("Failed to create AES cipher");
+
+ let decrypted_content = cipher
+ .decrypt_vec(&encrypted_content)
+ .expect("Failed to decrypt data");
+
+ let mut output_file =
+ File::create(format!("{}.decrypted", file_path)).expect("Failed to create the output file");
+
+ output_file
+ .write_all(&decrypted_content)
+ .expect("Failed to write decrypted data to the output file");
 }