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2.4 kB · 78 lines
Rust
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879#[allow(deprecated)]use aes_gcm::{Aes256Gcm, KeyInit, Nonce, aead::Aead};use hkdf::Hkdf;use sha2::Sha256;
use crate::CryptoError;
pub fn derive_key(master_key: &[u8], context: &[u8]) -> Result<[u8; 32], CryptoError> { let hk = Hkdf::<Sha256>::new(None, master_key); let mut output = [0u8; 32]; hk.expand(context, &mut output) .map_err(|e| CryptoError::KeyDerivationFailed(format!("{}", e)))?; Ok(output)}
pub fn encrypt_with_key(key: &[u8; 32], plaintext: &[u8]) -> Result<Vec<u8>, CryptoError> { use rand::RngCore;
let cipher = Aes256Gcm::new_from_slice(key) .map_err(|e| CryptoError::EncryptionFailed(format!("Failed to create cipher: {}", e)))?;
let mut nonce_bytes = [0u8; 12]; rand::thread_rng().fill_bytes(&mut nonce_bytes);
#[allow(deprecated)] let nonce = Nonce::from_slice(&nonce_bytes);
let ciphertext = cipher .encrypt(nonce, plaintext) .map_err(|e| CryptoError::EncryptionFailed(format!("{}", e)))?;
let mut result = Vec::with_capacity(12 + ciphertext.len()); result.extend_from_slice(&nonce_bytes); result.extend_from_slice(&ciphertext);
Ok(result)}
pub fn decrypt_with_key(key: &[u8; 32], encrypted: &[u8]) -> Result<Vec<u8>, CryptoError> { if encrypted.len() < 12 { return Err(CryptoError::DecryptionFailed( "Encrypted data too short".to_string(), )); }
let cipher = Aes256Gcm::new_from_slice(key) .map_err(|e| CryptoError::DecryptionFailed(format!("Failed to create cipher: {}", e)))?;
#[allow(deprecated)] let nonce = Nonce::from_slice(&encrypted[..12]); let ciphertext = &encrypted[12..];
cipher .decrypt(nonce, ciphertext) .map_err(|e| CryptoError::DecryptionFailed(format!("{}", e)))}
#[cfg(test)]mod tests { use super::*;
#[test] fn test_encrypt_decrypt() { let key = [0u8; 32]; let plaintext = b"hello world"; let encrypted = encrypt_with_key(&key, plaintext).unwrap(); let decrypted = decrypt_with_key(&key, &encrypted).unwrap(); assert_eq!(plaintext.as_slice(), decrypted.as_slice()); }
#[test] fn test_derive_key() { let master = b"master-key-for-testing"; let key1 = derive_key(master, b"context-1").unwrap(); let key2 = derive_key(master, b"context-2").unwrap(); assert_ne!(key1, key2); }}