AES encryption library that does 256 bit AES (Rijndael) encryption and decryption, Supports CBC and ECB mode, initialization vectors, PKCS7 padding, and Diffie-Hellman key exchange. Works with many C/C++ compilers including Microsoft C/C++ 4 and 6, Microsoft Visual Studio through 2022, MinGW GCC, Digital Mars, Watcom, LCC, and Borland. Works with Win32/Win64 through Windows 2011. Validated against the U.S. National Institute of Standards and Technology (NIST) «known answers» data set. Features of AES4C include:
- Performs 256-bit AES encryption and decryption.
- Includes Diffie-Hellman key exchange functions.
- Includes cryptographically secure pseudo random number generator.
- Does key generation from password phrases.
- Encrypts and decrypt files, strings, and byte data.
- Supports PKCS7 padding.
- Supports initialization vectors.
- Supports CBC (Cipher Block Chaining) mode.
- Supports ECB (Electronic Cookbook) mode.
- Supports SHA-256 cryptographic hash algorithm.
- Does random byte data generation.
- Allows concurrent encryption/decryption threads.
- Validated using «known answer tests» published by the National Institute of Standards and Technology.
- Includes multiple C/C++ example programs.
- Does not depend on support libraries (calls to core Windows API functions only).
- Royalty free distribution with your compiled application.
- C source code is available.
- Free technical support and updates for one year.
- Fully functional evaluation version available.
- Supports most C/C++ compilers: Microsoft, Borland, Watcom, LCC, GCC, Digital Mars.
- Supports all versions of 32-bit and 64-bit Microsoft C/C++ and Visual Studio C/C++.
- Includes 32-bit and 64-bit DLL files plus OBJ files for static linking.
- Works with 32-bit and 64-bit Windows through Windows 11

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