Crate gost_modes

This crate contains generic implementation of block cipher modes of operation defined in GOST R 34.13-2015.

CTR, CFB and OFB modes are implemented in terms of traits from the cipher crate.

MAC function defined in the GOST is implemented in the cmac crate.

Examples

use gost_modes::{GostCbc, GostPadding, BlockMode, consts::U2};
use kuznyechik::Kuznyechik;
use hex_literal::hex;

let key = hex!("
    8899aabbccddeeff0011223344556677
    fedcba98765432100123456789abcdef
");
let iv = hex!("
    1234567890abcef0a1b2c3d4e5f00112
    23344556677889901213141516171819
");
let pt = b"my secret message";

type Cipher = GostCbc<Kuznyechik, GostPadding, U2>;

let cipher = Cipher::new_from_slices(&key, &iv).unwrap();
let ct = cipher.encrypt_vec(pt);

let cipher = Cipher::new_from_slices(&key, &iv).unwrap();
let buf = cipher.decrypt_vec(&ct).unwrap();

assert_eq!(buf, &pt[..]);

// OFB mode example
use gost_modes::{GostOfb, StreamCipher, NewCipher};

let mut cipher = GostOfb::<Kuznyechik, U2>::new_from_slices(&key, &iv).unwrap();
let mut buf = pt.to_vec();
cipher.apply_keystream(&mut buf);
assert_eq!(buf, hex!("fddb196e81812e4174d1c9f741a3457a88"));

Re-exports

pub use block_modes;
pub use block_modes::block_padding;
pub use cipher;
pub use generic_array;

Modules

consts

Type aliases for many constants.

Structs

Ecb	Electronic Codebook (ECB) block cipher mode instance.
GostCbc	Cipher Block Chaining (CBC) mode of operation as defined in GOST R 34.13-2015
GostCfb	Cipher feedback (CFB) mode of operation as defined in GOST R 34.13-2015
GostCtr64	Counter (CTR) mode of operation for 64-bit block ciphers as defined in GOST R 34.13-2015
GostCtr128	Counter (CTR) mode of operation for 128-bit block ciphers as defined in GOST R 34.13-2015
GostOfb	Output feedback (OFB) mode of operation as defined in GOST R 34.13-2015

Traits

AsyncStreamCipher	Asynchronous stream cipher core trait.
BlockMode	Trait for a block cipher mode of operation that is used to apply a block cipher operation to input data to transform it into a variable-length output message.
NewCipher	Cipher creation trait.
StreamCipher	Synchronous stream cipher core trait.
StreamCipherSeek	Trait for seekable stream ciphers.

Type Definitions

GostPadding

Block padding procedure number 2 as defined in GOST R 34.13-2015