kanegreen / aes_frast Goto Github PK
View Code? Open in Web Editor NEWAn easy-to-use lib for AES encryption and decryption, coded in pure safe Rust-lang.
License: Apache License 2.0
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Request: CFB mode with 1-byte segment size, useful for streaming (CFB-8 or CFB-1)
Can aes_frast CFB mode be used with segment sizes other than the block size? From the code https://github.com/KaneGreen/aes_frast/blob/master/src/aes_with_operation_mode.rs#L228 it doesn't appear so:
/// The feedback size is fixed to 128 bits, which is the same as block size. but this would be useful for streaming, effectively converting the block cipher into a stream cipher. https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_Feedback_(CFB)
To use CFB to make a self-synchronizing stream cipher that will synchronize for any multiple of x bits lost, start by initializing a shift register the size of the block size with the initialization vector. This is encrypted with the block cipher, and the highest x bits of the result are XOR'ed with x bits of the plaintext to produce x bits of ciphertext. These x bits of output are shifted into the shift register, and the process (starting with encrypting the shift register with the block cipher) repeats for the next x bits of plaintext. Decryption is similar, start with the initialization vector, encrypt, and XOR the high bits of the result with x bits of the ciphertext to produce x bits of plaintext, then shift the x bits of the ciphertext into the shift register and encrypt again. This way of proceeding is known as CFB-8 or CFB-1 (according to the size of the shifting).
For comparison, openssl these are aes-128-cfb1 and aes-128-cfb8, and in Python PyCrypto, segment_size:
from Crypto.Cipher import AES
key=b"XXXXXXXXXXXXXXXX"
iv=key
cipher=AES.new(key, AES.MODE_CFB, iv, segment_size=8);
plain = b"\x41"
print "plain =",map(ord, plain)
print "encrypted =",map(ord, cipher.encrypt(plain)) # 209
print "encrypted2 =",map(ord, cipher.encrypt(plain)) # 150
print
cipher=AES.new(key, AES.MODE_CFB, iv);
print "decrypted =",map(ord, cipher.decrypt(b"\xd1")) # 65
print "decrypted2 =",map(ord, cipher.decrypt(b"\x96")) # 65Trying to port some code which used the Rust OpenSSL crate for CFB in 8-bit mode, first attempt using RustCrypto crates but not yet supported RustCrypto/block-ciphers#28, maybe will switch if it is implemented or to this module if possible.
Warnings on CFB example code
When building the CFB example https://github.com/KaneGreen/aes_frast/blob/master/src/aes_with_operation_mode.rs#L237 on Rust nightly-2018-09-29 it emits several warnings:
warning: unused import: `padding_128bit`
--> src/main.rs:5:56
|
5 | use aes_frast::{aes_core, aes_with_operation_mode, padding_128bit};
| ^^^^^^^^^^^^^^
|
= note: #[warn(unused_imports)] on by default
warning: variable does not need to be mutable
--> src/main.rs:7:9
|
7 | let mut plain: Vec<u8> = vec![0x34, 0x63, 0xD0, 0x89, 0x1D, 0x71, 0x4A, 0xB0,
| ----^^^^^
| |
| help: remove this `mut`
|
= note: #[warn(unused_mut)] on by default
warning: variable does not need to be mutable
--> src/main.rs:17:9
|
17 | let mut o_key: Vec<u8> = vec![0x0F, 0x57, 0x9F, 0x79, 0x50, 0x99, 0x0A, 0xCE,
| ----^^^^^
| |
| help: remove this `mut`
warning: variable does not need to be mutable
--> src/main.rs:22:9
|
22 | let mut iv: Vec<u8> = vec![0x04, 0x7C, 0xF3, 0xEA, 0xE1, 0x76, 0x45, 0x85,
| ----^^
| |
| help: remove this `mut`
Finished dev [unoptimized + debuginfo] target(s) in 0.55s
Fixing the warnings is straightforward, removed the unused import and mut's:
use aes_frast::{aes_core, aes_with_operation_mode};
let length: usize = 64;
let plain: Vec<u8> = vec![0x34, 0x63, 0xD0, 0x89, 0x1D, 0x71, 0x4A, 0xB0,
0x08, 0x5D, 0x22, 0xE1, 0x8B, 0xFA, 0x77, 0xF0,
0xEB, 0xE4, 0xB8, 0x9E, 0xF0, 0x05, 0x32, 0x7D,
0x4F, 0xBD, 0x87, 0x69, 0x75, 0x76, 0x78, 0xAA,
0x3D, 0x24, 0x06, 0x0C, 0xA4, 0xA5, 0x8C, 0xA0,
0x21, 0x58, 0xB8, 0xA1, 0x86, 0xAD, 0xBB, 0x6D,
0x9E, 0x09, 0x1C, 0x47, 0x06, 0x25, 0x4B, 0x2E,
0x30, 0x53, 0x3A, 0x5F, 0xE9, 0xDF, 0x3A, 0x90];
let mut cipher = vec![0u8; length];
let mut dec_cipher = vec![0u8; length];
let o_key: Vec<u8> = vec![0x0F, 0x57, 0x9F, 0x79, 0x50, 0x99, 0x0A, 0xCE,
0x66, 0x72, 0xA8, 0x17, 0x95, 0x1F, 0xF6, 0x06,
0x24, 0x40, 0xDE, 0xF5, 0x08, 0xF1, 0x64, 0x34,
0xD6, 0xEF, 0xEF, 0xFD, 0x26, 0x23, 0x04, 0x95];
let mut w_keys: Vec<u32> = vec![0u32; 60];
let iv: Vec<u8> = vec![0x04, 0x7C, 0xF3, 0xEA, 0xE1, 0x76, 0x45, 0x85,
0x72, 0x52, 0x7B, 0xAA, 0x26, 0x0D, 0x65, 0xBB];
aes_core::setkey_enc_auto(&o_key, &mut w_keys);
aes_with_operation_mode::cfb_enc(&plain, &mut cipher, &w_keys, &iv);
let expected_encrypted = vec![0x9D, 0xF9, 0x3D, 0x71, 0xC1, 0x9E, 0x50, 0x22,
0x36, 0x35, 0xF1, 0xB6, 0xED, 0xA6, 0x86, 0x74,
0x5F, 0x34, 0xD6, 0x93, 0xA9, 0x0F, 0xFF, 0x50,
0x4C, 0xE6, 0x8E, 0xC0, 0x06, 0x3F, 0x3A, 0x62,
0x78, 0x9F, 0xAB, 0xB1, 0x06, 0x95, 0x64, 0xB6,
0xBB, 0x06, 0x92, 0x02, 0x34, 0x2D, 0x36, 0x35,
0xA4, 0x95, 0x30, 0x2E, 0x20, 0xD3, 0xE8, 0x53,
0x95, 0xA2, 0xDF, 0x83, 0x9B, 0x7B, 0x12, 0x3F];
assert_eq!(length, cipher.len(), "ERROR cipher.len()");
for i in 0..length {
assert_eq!(expected_encrypted[i], cipher[i], "ERROR in encrypt {}", i);
}
// Notice: CFB only uses block-encryption, no matter we use it as encryption or decryption.
// So, keep don't use functions which start with`setkey_dec_` and keep the next line commented out.
//aes_core::setkey_dec_auto(&o_key, &mut w_keys);
aes_with_operation_mode::cfb_dec(&cipher, &mut dec_cipher, &w_keys, &iv);
assert_eq!(length, dec_cipher.len(), "ERROR dec_cipher.len()");
for i in 0..length {
assert_eq!(plain[i], dec_cipher[i], "ERROR in decrypt {}", i);
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