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Home Forums How do you encrypt/decrypt files using AES in C#? – MindStick
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ICSM Computer
ICSM Computer 26 May 2025
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To encrypt and decrypt files using AES in C#, you can use the Aes class from the System.Security.Cryptography namespace. Below is a practical example demonstrating both encryption and decryption of files.

1. AES File Encryption in C#

Encrypt a file

using System;
using System.IO;
using System.Security.Cryptography;

public class AesFileEncryption
{
    public static void EncryptFile(string inputFile, string outputFile, byte[] key, byte[] iv)
    {
        using FileStream inputStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
        using FileStream outputStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
        using Aes aes = Aes.Create();
        aes.Key = key;
        aes.IV = iv;

        using CryptoStream cryptoStream = new CryptoStream(outputStream, aes.CreateEncryptor(), CryptoStreamMode.Write);
        inputStream.CopyTo(cryptoStream);
    }
}

2. AES File Decryption in C#

Decrypt a file

public class AesFileDecryption
{
    public static void DecryptFile(string inputFile, string outputFile, byte[] key, byte[] iv)
    {
        using FileStream inputStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read);
        using FileStream outputStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
        using Aes aes = Aes.Create();
        aes.Key = key;
        aes.IV = iv;

        using CryptoStream cryptoStream = new CryptoStream(inputStream, aes.CreateDecryptor(), CryptoStreamMode.Read);
        cryptoStream.CopyTo(outputStream);
    }
}

3. Generate AES Key and IV

using Aes aes = Aes.Create();
byte[] key = aes.Key;
byte[] iv = aes.IV;

// Save these securely; they are required for both encryption and decryption

Important: Always securely store your AES Key and IV. Never hardcode them in production apps.

Summary

Task Method
Encrypt AesFileEncryption.EncryptFile
Decrypt AesFileDecryption.DecryptFile
Key/IV Gen Aes.Create()
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