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extern crate libc;
use std::ptr;
use self::libc::c_int;
use super::error::AezDecryptionError;
pub const AEZ_KEY_SIZE: usize = 48;
pub const AEZ_NONCE_SIZE: usize = 16;
extern "C" {
fn aez_setup_encrypt(key: *const u8, nonce: *const u8,
ad: *const u8, adlen: usize, alen: usize,
src: *const u8, srclen: usize, dst: *mut u8);
fn aez_setup_decrypt(key: *const u8, nonce: *const u8,
ad: *const u8, adlen: usize, alen: usize,
src: *const u8, srclen: usize, dst: *mut u8) -> c_int;
}
pub fn encrypt(key: &[u8; AEZ_KEY_SIZE], nonce: &[u8; AEZ_NONCE_SIZE], mesg: &Vec<u8>) -> Vec<u8> {
let mut ciphertext = vec![0u8; mesg.len()];
unsafe {
aez_setup_encrypt(key as *const u8, nonce as *const u8, ptr::null(), 0, 0, mesg.as_ptr(), mesg.len(), ciphertext.as_mut_ptr());
}
ciphertext
}
pub fn decrypt(key: &[u8; AEZ_KEY_SIZE], nonce: &[u8; AEZ_NONCE_SIZE], mesg: &Vec<u8>) -> Result<Vec<u8>, AezDecryptionError> {
let mut plaintext = vec![0u8; mesg.len()];
let mut ret: c_int = 0;
unsafe {
ret = aez_setup_decrypt(key as *const u8, nonce as *const u8, ptr::null(), 0, 0, mesg.as_ptr(), mesg.len(), plaintext.as_mut_ptr());
}
if ret != 0 {
return Err(AezDecryptionError::DecryptionError);
}
Ok(plaintext)
}
#[cfg(test)]
mod tests {
extern crate rustc_serialize;
use super::*;
use std::ptr;
use self::rustc_serialize::hex::FromHex;
use std::fs::File;
use std::path::PathBuf;
use std::io::prelude::*;
#[test]
fn test_simple_bindings_usage() {
let key_str = "ec6dc9fb5e68dbc2a7615c67baf5b8e472953b84918f1e0c4e01cf43387535d292c4be5657849d84246c7253a3252577";
let key = key_str.from_hex().unwrap();
let nonce_str = "05ef180b20d561bf6024a4ecf725fc17";
let nonce = nonce_str.from_hex().unwrap();
let m_str = "82ed7abbe93cb1a7ec2d1072f591c058237ff54fc4d44d86cb07c0620675b56b";
let plaintext = m_str.from_hex().unwrap();
let mut case_ciphertext = vec![0u8; plaintext.len()];
let mut case_plaintext = vec![0u8; plaintext.len()];
unsafe {
aez_setup_encrypt(key.as_ptr(), nonce.as_ptr(),
ptr::null(), 0, 0,
plaintext.as_ptr(), plaintext.len(), case_ciphertext.as_mut_ptr());
aez_setup_decrypt(key.as_ptr(), nonce.as_ptr(),
ptr::null(), 0, 0,
case_ciphertext.as_ptr(), case_ciphertext.len(), case_plaintext.as_mut_ptr());
assert_eq!(plaintext.as_slice(), case_plaintext.as_slice());
}
}
#[test]
fn test_encrypt_decrypt() {
let key_str = "ec6dc9fb5e68dbc2a7615c67baf5b8e472953b84918f1e0c4e01cf43387535d292c4be5657849d84246c7253a3252577";
let key = key_str.from_hex().unwrap();
let nonce_str = "05ef180b20d561bf6024a4ecf725fc17";
let nonce = nonce_str.from_hex().unwrap();
let mut key_array = [0u8; AEZ_KEY_SIZE];
key_array.clone_from_slice(&key);
let mut nonce_array = [0u8; AEZ_NONCE_SIZE];
nonce_array.clone_from_slice(&nonce);
let m_str = "82ed7abbe93cb1a7ec2d1072f591c058237ff54fc4d44d86cb07c0620675b56b";
let c_str = "8adacd91e46ed69d6c7396c0933eb4d5c125b202875e496cb32f49fb3304e489";
let plaintext = m_str.from_hex().unwrap();
let ciphertext = c_str.from_hex().unwrap();
let case_plaintext = decrypt(&key_array, &nonce_array, &ciphertext).unwrap();
assert_eq!(plaintext, case_plaintext);
}
fn get_test_file_path(filename: String) -> PathBuf {
let mut path = PathBuf::from(file!());
path.pop();
path.pop();
path.pop();
path.push("testdata/");
path.push(filename);
path
}
fn get_test_data(filename: String) -> String {
let extract_tests_path = get_test_file_path(filename);
let mut f = File::open(extract_tests_path).unwrap();
let mut contents = String::new();
f.read_to_string(&mut contents).unwrap();
contents
}
#[derive(Serialize, Deserialize, Debug)]
struct ExtractTestCase {
k: String,
nonce: String,
data: Vec<String>,
tau: u32,
m: String,
c: String,
}
#[test]
fn test_encrypt_no_ad_vectors() {
let cases_str = get_test_data("encrypt_no_ad.json".to_string());
let cases: Vec<ExtractTestCase> = serde_json::from_str(&cases_str).unwrap();
for case in cases {
if case.tau != 0 || case.nonce.from_hex().unwrap().len() != 16 {
continue
}
let key = case.k.from_hex().unwrap();
let nonce = case.nonce.from_hex().unwrap();
let plaintext = case.m.from_hex().unwrap();
let ciphertext = case.c.from_hex().unwrap();
let mut key_array = [0u8; AEZ_KEY_SIZE];
key_array.clone_from_slice(&key);
let mut nonce_array = [0u8; AEZ_NONCE_SIZE];
nonce_array.clone_from_slice(&nonce);
let case_ciphertext = encrypt(&key_array, &nonce_array, &plaintext);
assert_eq!(case_ciphertext, ciphertext);
let case_plaintext = decrypt(&key_array, &nonce_array, &ciphertext).unwrap();
assert_eq!(case_plaintext, plaintext);
}
}
}