AES

C++ AES(Advanced Encryption Standard) implementation

Usage

This class is very simple to use:

...
unsigned char plain[] = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff }; //plaintext example
unsigned char key[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }; //key example
unsigned int plainLen = 16 * sizeof(unsigned char);  //bytes in plaintext

AES aes(AESKeyLength::AES_128);  ////128 - key length, can be 128, 192 or 256
c = aes.EncryptECB(plain, plainLen, key);
//now variable c contains plainLen bytes - ciphertext
...

Or for vectors:

...


vector<unsigned char> plain = { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff }; //plaintext example
vector<unsigned char> key = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }; //key example

AES aes(AESKeyLength::AES_128);
c = aes.EncryptECB(plain, key);
//now vector c contains ciphertext
...

ECB, CBC, CFB modes are supported.

Padding

This library does not provide any padding because padding is not part of AES standard. Plaintext and ciphertext length in bytes must be divisible by 16. If length doesn't satisfy this condition exception will be thrown

Links

• Wiki
• NIST

Development:

1. git clone https://github.com/SergeyBel/AES.git
2. docker-compose build
3. docker-compose up -d
4. use make commands

There are four executables in bin folder:

• test - run tests
• debug - version for debugging (main code will be taken from dev/main.cpp)
• profile - version for profiling with gprof (main code will be taken from dev/main.cpp)
• speedtest - performance speed test (main code will be taken from speedtest/main.cpp)
• release - version with optimization (main code will be taken from dev/main.cpp)

Build commands:

• make build_all - build all targets
• make build_test - build test target
• make build_debug - build debug target
• make build_profile - build profile target
• make build_speed_test - build speedtest target
• make build_release - build release target
• make style_fix - fix code style
• make test - run tests
• make debug - run debug version
• make profile - run profile version
• make speed_test - run performance speed test
• make release - run release version
• make clean - clean bin directory