AES 128 192 256

---

Implementation of Advanced Encrypting Standart in pure C.

Available standarts

Name	Key size	Number of Rounds
AES-128	128	10
AES-192	192	12
AES-256	256	14

Benchmarks for AES as block cipher

Standart	1 MB	10 MB	100 MB	1 GB
AES-128	0m0.311s	0m2.833s	0m28.657s	7m24.910s
AES-192	0m0.291s	0m2.796s	0m28.343s	7m43.737s
AES-256	0m0.343s	0m2.877s	0m28.450s	7m36.052s

Compiling

git clone https://github.com/yhetman/aes256
cd aes256
make

To reocompile the code use:

make re

Usage

./aes -i ./input_file -o ./output_file -s {16 | 24 | 32} -k ./key_file -m {1 | 2 | 3 | 4 | 5}

Options and flags

Flags:
	-i  -- specify ./path/to/input/file
	-o  -- specify ./path/to/output/file
	-k  -- specify ./path/to/key/file
	-s	-- specify the key length in bytes.
	-e	-- specify the encrypting process.
	-d	-- specify the decrypting process.
	-m	-- specify stream mode of AES.

Available stream modes:
		1 -- ECB;
		2 -- CBC;
		3 -- CFB;
		4 -- OFB;
		5 -- CTR

Benchmarks for AES-256 stream modes

Mode	1 MB	10 MB	100 MB
ECB	0m0.030s	0m0.069s	0m0.500s
CBC	0m0.186s	0m1.652s	0m16.648s
CFB	0m0.201s	0m1.641s	0m16.333s
OFB	0m0.187s	0m1.671s	0m17.022s
CTR	0m0.189s	0m1.662s	0m19.935s