How do you encrypt/decrypt files using AES in C#?

Question

ICSM Computer · Answer

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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How do you encrypt/decrypt files using AES in C#?

ICSM Computer

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1 Answers

1. AES File Encryption in C#

Encrypt a file

2. AES File Decryption in C#

Decrypt a file

3. Generate AES Key and IV

Summary

Liked By

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