This tool implements AES-128 encryption and decryption in C++. It provides a command-line interface to encrypt a normal string message and save it to a file, and to decrypt the message from that file back to a normal string.
- Encrypt a normal string message and save it in hexadecimal format to
message.aes. - Decrypt a message from the
message.aesfile back to a normal string.
- C++ compiler (e.g., g++, clang++)
- Basic understanding of AES encryption and decryption
-
Compile the Program
Ensure you have a C++ compiler installed. Compile the source code with:
g++ -o aes_tool aes_tool.cpp
Run the Program
Run the compiled program:
./aes_tool You will be prompted to choose between encryption and decryption.
Encryption
Select option 1 to encrypt a message. Enter the message you want to encrypt. The encrypted message will be saved to message.aes and displayed in hexadecimal format. Decryption
Select option 2 to decrypt a message. The program will read from message.aes, decrypt the message, and display the result. Key The AES-128 algorithm requires a 16-byte key. Modify the key array in the source code to use your desired key.
cpp unsigned char key[16] = { /* 16 bytes key here */ }; Padding The program uses PKCS7 padding to ensure the input string fits the 16-byte block size required by AES. The padding is automatically handled during encryption and removed during decryption.
Files aes_tool.cpp: The main source code file for the AES-128 encryption/decryption tool. message.aes: The file where the encrypted message is saved. Example Encrypt bash ./aes_tool mathematica AES-128 Encryption/Decryption Tool
- Encrypt message
- Decrypt message Enter option (1 or 2): 1 Enter message (normal string, will be padded to fit 16 bytes): Hello, World! Encrypted message saved to message.aes Encrypted message (hex): 7e0a74d62b8a4ed1e482a0b7e4bbf23e Decrypt bash ./aes_tool mathematica AES-128 Encryption/Decryption Tool
- Encrypt message
- Decrypt message Enter option (1 or 2): 2 Decrypted message: Hello, World!