Managed .Net (.NET 8) compatible AES-CTR cipher written in C# (using Aes.Create for AES operations)
using CS_AES_CTR;
byte[] mySimpleTextAsBytes = Encoding.ASCII.GetBytes("Plain text I want to encrypt");
// In real world, generate these with cryptographically secure pseudo-random number generator (CSPRNG)
byte[] key = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 };
byte[] initialCounter = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05 };
// Encrypt
AES_CTR forEncrypting = new AES_CTR(key, initialCounter);
byte[] encryptedContent = new byte[mySimpleTextAsBytes.Length];
forEncrypting.EncryptBytes(encryptedContent, mySimpleTextAsBytes);
// Decrypt
AES_CTR forDecrypting = new AES_CTR(key, initialCounter);
byte[] decryptedContent = new byte[encryptedContent.Length];
forDecrypting.DecryptBytes(decryptedContent, encryptedContent);You can try out the code in .NET Fiddle