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#![recursion_limit = "1024"]
#[macro_use]
extern crate error_chain;
extern crate tomcrypt_sys;
use std::ffi::*;
use std::mem::{self, transmute};
use std::os::raw::*;
use std::ptr;
pub mod ffi {
pub use tomcrypt_sys::*;
pub use tomcrypt_sys::_bindgen_ty_2 as Error;
}
#[allow(unused_doc_comment)]
pub mod errors {
error_chain! {
foreign_links {
Io(::std::io::Error);
}
errors {
Tomcrypt(e: ::ffi::_bindgen_ty_2) {
description("tomcrypt error")
display("tomcrypt error {}", unsafe {
::CStr::from_ptr(::ffi::error_to_string(*e as ::c_int))
.to_str().unwrap()
})
}
}
}
}
use errors::*;
macro_rules! tryt {
($e:expr) => {
match mem::transmute($e) {
ffi::CRYPT_OK => (),
e => bail!(ErrorKind::Tomcrypt(e)),
}
};
}
#[derive(Clone, Debug)]
pub struct Rng(c_int);
#[derive(Clone, Debug)]
pub struct Cipher(c_int);
#[derive(Debug)]
pub struct EccKey(ffi::ecc_key);
#[derive(Clone)]
pub struct EaxState(ffi::eax_state);
impl EccKey {
pub fn new(prng: Rng, keysize: c_uint) -> Result<Self> {
unsafe {
let mut k = mem::uninitialized();
tryt!(ffi::ecc_make_key(
ptr::null_mut(),
prng.0,
keysize as c_int,
&mut k as *mut ffi::ecc_key
));
Ok(EccKey(k))
}
}
pub fn import(data: &[u8]) -> Result<Self> {
unsafe {
let mut res = mem::uninitialized();
tryt!(ffi::ecc_import(
data.as_ptr(),
data.len() as c_ulong,
&mut res
));
Ok(EccKey(res))
}
}
pub fn export_public(&mut self) -> Result<Vec<u8>> {
unsafe {
let mut buf = vec![0; ffi::ECC_BUF_SIZE as usize];
let mut len = buf.len() as c_ulong;
tryt!(ffi::ecc_export(
buf.as_mut_ptr(),
&mut len,
transmute(ffi::PK_PUBLIC),
&mut self.0
));
buf.truncate(len as usize);
Ok(buf)
}
}
pub fn export_private(&mut self) -> Result<Vec<u8>> {
unsafe {
let mut buf = vec![0; ffi::ECC_BUF_SIZE as usize];
let mut len = buf.len() as c_ulong;
tryt!(ffi::ecc_export(
buf.as_mut_ptr(),
&mut len,
transmute(ffi::PK_PRIVATE),
&mut self.0
));
buf.truncate(len as usize);
Ok(buf)
}
}
pub fn create_shared_secret(
private_key: &mut EccKey,
public_key: &mut EccKey,
len: usize,
) -> Result<Vec<u8>> {
unsafe {
let mut buf = vec![0; len];
let mut len = len as c_ulong;
tryt!(ffi::ecc_shared_secret(
&mut private_key.0,
&mut public_key.0,
buf.as_mut_ptr(),
&mut len
));
buf.truncate(len as usize);
Ok(buf)
}
}
}
impl Drop for EccKey {
fn drop(&mut self) {
unsafe {
ffi::ecc_free(&mut self.0);
}
}
}
impl EaxState {
pub fn new(cipher: Cipher, key: &[u8], nonce: &[u8], header: Option<&[u8]>) -> Result<Self> {
unsafe {
let (h, h_len) = if let Some(header) = header {
(header.as_ptr(), header.len() as c_ulong)
} else {
(ptr::null(), 0)
};
let mut k = mem::uninitialized();
tryt!(ffi::eax_init(
&mut k as *mut ffi::eax_state,
cipher.0,
key.as_ptr(),
key.len() as c_ulong,
nonce.as_ptr(),
nonce.len() as c_ulong,
h,
h_len
));
Ok(EaxState(k))
}
}
pub fn encrypt_in_place(&mut self, data: &mut [u8]) -> Result<()> {
unsafe {
tryt!(ffi::eax_encrypt(
&mut self.0,
data.as_ptr(),
data.as_mut_ptr(),
data.len() as c_ulong
));
}
Ok(())
}
pub fn decrypt_in_place(&mut self, data: &mut [u8]) -> Result<()> {
unsafe {
tryt!(ffi::eax_decrypt(
&mut self.0,
data.as_ptr(),
data.as_mut_ptr(),
data.len() as c_ulong
));
}
Ok(())
}
pub fn finish(mut self, tag_len: usize) -> Result<Vec<u8>> {
let mut res = vec![0; tag_len];
unsafe {
let mut len = tag_len as c_ulong;
tryt!(ffi::eax_done(&mut self.0, res.as_mut_ptr(), &mut len));
res.drain((len as usize)..);
}
Ok(res)
}
}
pub fn init() {
unsafe {
ffi::init_TFM();
}
}
pub fn register_sprng() -> Result<()> {
unsafe {
tryt!(ffi::register_prng(&ffi::sprng_desc));
}
Ok(())
}
pub fn sprng() -> Rng {
Rng(unsafe {
ffi::find_prng(CString::new("sprng").unwrap().as_ptr())
})
}
pub fn register_rijndael_cipher() -> Result<()> {
unsafe {
tryt!(ffi::register_cipher(&ffi::rijndael_desc));
}
Ok(())
}
pub fn rijndael() -> Cipher {
Cipher(unsafe {
ffi::find_cipher(CString::new("rijndael").unwrap().as_ptr())
})
}