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.

The MarshallSoft AES Library for Visual Basic (AES4VB) is a toolkit that allows software developers to easily implement 256-bit encryption and decryption in Windows Visual Basic applications. AES4VB is a component (DLL) library that provides an easy interface to encrypt/decrypt files and data using the 256-bit Rijndael «Advanced Encryption Standard» (AES) as specified by the U.S. National Institute of Standards and Technology (NIST).The AES algorithm is commonly used by many financial entities such as banks to protect their customer's sensitive information. Some of the features of AES4VB are:
- 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 Visual Basic 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.
- Works with 32-bit Visual Basic 4.0 through Visual Basic 6.0.
- Works with 32-bit and 64-bit Visual Basic through Visual Studio 2022.
- Works with 32-bit and 64-bit Windows through Windows 11.

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