use nettle_sys::{
camellia256_ctx, nettle_camellia256_crypt, nettle_camellia256_invert_key,
nettle_camellia256_set_decrypt_key, nettle_camellia256_set_encrypt_key,
};
use std::cmp::min;
use std::mem::{MaybeUninit, transmute};
use std::os::raw::c_void;
use crate::cipher::RawCipherFunctionPointer;
use crate::{cipher::Cipher, Error, Result};
pub struct Camellia256 {
context: Box<camellia256_ctx>,
}
impl_zeroing_drop_for!(Camellia256);
impl Camellia256 {
pub fn with_inverted_key(encrypt: &Self) -> Self {
let context = unsafe {
let mut ctx = Box::new(MaybeUninit::uninit());
nettle_camellia256_invert_key(ctx.as_mut_ptr(),
encrypt.context.as_ref() as *const _);
transmute(ctx)
};
Camellia256 { context }
}
pub fn crypt(&mut self, dst: &mut [u8], src: &[u8]) {
unsafe {
nettle_camellia256_crypt(
self.context.as_mut() as *mut _,
min(src.len(), dst.len()),
dst.as_mut_ptr(),
src.as_ptr(),
)
};
}
}
impl Cipher for Camellia256 {
const BLOCK_SIZE: usize = ::nettle_sys::CAMELLIA_BLOCK_SIZE as usize;
const KEY_SIZE: usize = ::nettle_sys::CAMELLIA256_KEY_SIZE as usize;
fn with_encrypt_key(key: &[u8]) -> Result<Camellia256> {
if key.len() != Camellia256::KEY_SIZE {
return Err(Error::InvalidArgument { argument_name: "key" });
}
let context = unsafe {
let mut ctx = Box::new(MaybeUninit::uninit());
nettle_camellia256_set_encrypt_key(ctx.as_mut_ptr(), key.as_ptr());
transmute(ctx)
};
Ok(Camellia256 { context })
}
fn with_decrypt_key(key: &[u8]) -> Result<Camellia256> {
if key.len() != Camellia256::KEY_SIZE {
return Err(Error::InvalidArgument { argument_name: "key" });
}
let context = unsafe {
let mut ctx = Box::new(MaybeUninit::uninit());
nettle_camellia256_set_decrypt_key(ctx.as_mut_ptr(), key.as_ptr());
transmute(ctx)
};
Ok(Camellia256 { context })
}
fn encrypt(&mut self, dst: &mut [u8], src: &[u8]) {
self.crypt(dst, src)
}
fn decrypt(&mut self, dst: &mut [u8], src: &[u8]) {
self.crypt(dst, src)
}
fn context(&mut self) -> *mut c_void {
(self.context.as_mut() as *mut camellia256_ctx) as *mut c_void
}
fn raw_encrypt_function() -> RawCipherFunctionPointer {
RawCipherFunctionPointer::new(nettle_camellia256_crypt)
}
fn raw_decrypt_function() -> RawCipherFunctionPointer {
RawCipherFunctionPointer::new(nettle_camellia256_crypt)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn set_key() {
let key = &(b"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x10\x11\x12\x13\x14\x15\x16\x09\x10\x11\x12\x13\x14\x15\x16\x09\x10\x11\x12\x13\x14\x15\x16"[..]);
let _ = Camellia256::with_encrypt_key(key).unwrap();
let _ = Camellia256::with_decrypt_key(key).unwrap();
}
#[test]
fn round_trip() {
let key = vec![
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14,
0x15, 0x16, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
];
let input = vec![
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16,
];
let mut cipher = vec![0; 16];
let mut output = vec![0; 16];
let mut enc = Camellia256::with_encrypt_key(&key).unwrap();
let mut dec = Camellia256::with_decrypt_key(&key).unwrap();
enc.encrypt(&mut cipher, &input);
dec.decrypt(&mut output, &cipher);
assert_eq!(output, input);
}
#[test]
fn round_trip_invert() {
let key = vec![
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14,
0x15, 0x16, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
];
let input = vec![
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11,
0x12, 0x13, 0x14, 0x15, 0x16,
];
let mut cipher = vec![0; 16];
let mut output = vec![0; 16];
let mut enc = Camellia256::with_encrypt_key(&key).unwrap();
let mut dec = Camellia256::with_inverted_key(&enc);
enc.encrypt(&mut cipher, &input);
dec.decrypt(&mut output, &cipher);
assert_eq!(output, input);
}
}