EncryptionHelper (VB.NET)

A comprehensive utility class for data encryption and decryption operations, supporting multiple encryption algorithms and standards.

Features

• Symmetric encryption (AES)
• Asymmetric encryption (RSA)
• Hash generation
• Digital signatures
• Key management
• Password-based encryption
• Secure random number generation

Installation

Add the EncryptionHelper.vb file to your project.

            
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Imports JVR.Helpers
        

Usage Examples

Symmetric Encryption

            
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Dim encryption As New EncryptionHelper()

' Encrypt data
Dim plainText As String = "Sensitive data"
Dim key As Byte() = encryption.GenerateAesKey()
Dim iv As Byte() = encryption.GenerateIV()
Dim encrypted As Byte() = encryption.EncryptAes(plainText, key, iv)

' Decrypt data
Dim decrypted As String = encryption.DecryptAes(encrypted, key, iv)
        

Asymmetric Encryption

            
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Dim encryption As New EncryptionHelper()

' Generate key pair
Dim keyPair = encryption.GenerateRsaKeyPair()

' Encrypt with public key
Dim plainText As String = "Sensitive data"
Dim encrypted As Byte() = encryption.EncryptRsa(plainText, keyPair.PublicKey)

' Decrypt with private key
Dim decrypted As String = encryption.DecryptRsa(encrypted, keyPair.PrivateKey)
        

Password-Based Encryption

            
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Dim encryption As New EncryptionHelper()

' Encrypt with password
Dim plainText As String = "Sensitive data"
Dim password As String = "MySecurePassword"
Dim encrypted As Byte() = encryption.EncryptWithPassword(plainText, password)

' Decrypt with password
Dim decrypted As String = encryption.DecryptWithPassword(encrypted, password)
        

API Reference

Symmetric Encryption

• GenerateAesKey() As Byte(): Generates AES key
• GenerateIV() As Byte(): Generates initialization vector
• EncryptAes(plainText As String, key As Byte(), iv As Byte()) As Byte(): Encrypts data using AES
• DecryptAes(cipherText As Byte(), key As Byte(), iv As Byte()) As String: Decrypts AES encrypted data

Asymmetric Encryption

• GenerateRsaKeyPair() As RsaKeyPair: Generates RSA key pair
• EncryptRsa(plainText As String, publicKey As Byte()) As Byte(): Encrypts data using RSA
• DecryptRsa(cipherText As Byte(), privateKey As Byte()) As String: Decrypts RSA encrypted data
• SignData(data As Byte(), privateKey As Byte()) As Byte(): Creates digital signature
• VerifySignature(data As Byte(), signature As Byte(), publicKey As Byte()) As Boolean: Verifies digital signature

Password-Based Encryption

• EncryptWithPassword(plainText As String, password As String) As Byte(): Encrypts data using password
• DecryptWithPassword(cipherText As Byte(), password As String) As String: Decrypts password-protected data
• GeneratePasswordHash(password As String, salt As Byte()) As Byte(): Generates password hash

Key Management

• ExportKey(key As Byte(), format As String) As String: Exports encryption key
• ImportKey(keyData As String, format As String) As Byte(): Imports encryption key
• GenerateRandomKey(keySize As Integer) As Byte(): Generates random key

Security Features

• Secure random number generation
• Salt generation for password hashing
• Key stretching
• Secure key storage
• Memory zeroing for sensitive data

Dependencies

• .NET 6.0 or higher
• System.Security.Cryptography
• BouncyCastle.NetCore (optional for additional algorithms)

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contact

• Website: jvrsoftware.co.za
• Email: jvrsoftware@gmail.com or jan@jvrsoftware.co.za

Version History

• 2.0.1: Added quantum-resistant encryption algorithms
• 2.0.0: Added asymmetric encryption support
• 1.0.0: Initial release with symmetric encryption