https://github.com/soreing/des-cpp-encrypt
Simple DES encryption library for C++
https://github.com/soreing/des-cpp-encrypt
cpp cryptography des
Last synced: 6 months ago
JSON representation
Simple DES encryption library for C++
- Host: GitHub
- URL: https://github.com/soreing/des-cpp-encrypt
- Owner: Soreing
- Created: 2021-08-04T09:18:24.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2021-08-08T18:39:52.000Z (about 4 years ago)
- Last Synced: 2025-02-10T09:43:56.278Z (8 months ago)
- Topics: cpp, cryptography, des
- Language: C++
- Homepage:
- Size: 4.88 KB
- Stars: 3
- Watchers: 1
- Forks: 0
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# des-cpp-encrypt
# Description
des-cpp-encrypt is a simple C++ library for generating DES keys and encrypting or decrypting data. Encryption is only implemented for 1 block of data. If you want to encrypt more than 8 bytes, you will need to implement different modes of operation, like des-ecb.
# Installation
Include `DES.h` in your project for defining the functions. If you want to compile the library from source, include the cpp file `DES.cpp` for the implementation. Alternatively, you can compile the source code to a static library and include it that way.
# Usage
## Creating Keys
To create round keys, you need a character array of 8 bytes. The `DES_CreateKeys` function will create 16 round keys based on your input key, which is stored as a `[16][8]` 2D character array.
```c++
char key[8] = {0xAA,0xBB,0x09,0x18,0x27,0x36,0xCC,0xDD};
char roundKeys[16][8];
DES_CreateKeys(key, roundKeys);
```
## Encryption
After you generated the round keys, you can encrypt some data. You need to provide this data in the form of a character array of 8 bytes. The result is stored in an 8 byte large buffer you also need to provide.
**The buffer MUST be initialized to 0**
```c++
char plainText[8] = {'T','e','s','t','D','a','t','a'};
char cipherText[8] = {0,0,0,0,0,0,0,0};
DES_Encrypt(plainText, roundKeys, cipherText);
```
## Decryption
To Decrypt the ciphertext, you need to perform similar steps to encryption. You need to have the round keys, and you need to have an 8 byte ciphertext, and the result is stored in an 8 byte buffer.
**The buffer MUST be initialized to 0**
```c++
// 1 Extra character for the null terminator
char original[9] = {0,0,0,0,0,0,0,0,0};
DES_Decrypt(cipherText, roundKeys, original);
```