### Install EntityFrameworkCore.DataEncryption Package

Source: https://github.com/softfluent/entityframeworkcore.dataencryption/blob/main/README.md

Install the EntityFrameworkCore.DataEncryption package using the NuGet Package Manager Console.

```powershell
PM> Install-Package EntityFrameworkCore.DataEncryption
```

--------------------------------

### Implement a Custom Encryption Provider

Source: https://github.com/softfluent/entityframeworkcore.dataencryption/blob/main/README.md

Create a class that inherits from IEncryptionProvider and implements the Encrypt and Decrypt methods for custom data encryption.

```csharp
public class MyCustomEncryptionProvider : IEncryptionProvider
{
	public byte[] Encrypt(byte[] input)
	{
		// Encrypt the given input and return the encrypted data as a byte[].
	}
	
	public byte[] Decrypt(byte[] input)
	{
		// Decrypt the given input and return the decrypted data as a byte[].
	}
}
```

--------------------------------

### Fluent Configuration Encryption with AesProvider

Source: https://github.com/softfluent/entityframeworkcore.dataencryption/blob/main/README.md

Shows how to configure encryption for specific properties using the IsEncrypted() method within the fluent API configuration in DbContext. This approach allows granular control over which properties are encrypted.

```csharp
public class UserEntity
{
	public int Id { get; set; }
	public string Username { get; set; }
	public string Password { get; set; }
	public int Age { get; set; }
}

public class DatabaseContext : DbContext
{
	// Get key and IV from a Base64String or any other ways.
	// You can generate a key and IV using "AesProvider.GenerateKey()"
	private readonly byte[] _encryptionKey = ...;
	private readonly byte[] _encryptionIV = ...;
	private readonly IEncryptionProvider _provider;

	public DbSet<UserEntity> Users { get; set; }
	
	public DatabaseContext(DbContextOptions options)
		: base(options)
	{
		_provider = new AesProvider(this._encryptionKey, this._encryptionIV);
	}
	
	protected override void OnModelCreating(ModelBuilder modelBuilder)
	{
		// Entities builder *MUST* be called before UseEncryption().
		var userEntityBuilder = modelBuilder.Entity<UserEntity>();
		
		userEntityBuilder.Property(x => x.Username).IsRequired().IsEncrypted();
		userEntityBuilder.Property(x => x.Password).IsRequired().IsEncrypted();

		modelBuilder.UseEncryption(_provider);
	}
}
```

--------------------------------

### Use Custom Encryption Provider in DbContext

Source: https://github.com/softfluent/entityframeworkcore.dataencryption/blob/main/README.md

Integrate your custom encryption provider into your DbContext by instantiating it and passing it to the UseEncryption method during model creation.

```csharp
public class DatabaseContext : DbContext
{
	private readonly IEncryptionProvider _provider;

	public DatabaseContext(DbContextOptions options)
		: base(options)
	{
		_provider = new MyCustomEncryptionProvider();
	}

	protected override void OnModelCreating(ModelBuilder modelBuilder)
	{
		modelBuilder.UseEncryption(_provider);
	}
}
```

--------------------------------

### Attribute-based Encryption with AesProvider

Source: https://github.com/softfluent/entityframeworkcore.dataencryption/blob/main/README.md

Demonstrates how to use the [Encrypted] attribute to mark properties for encryption and configure AesProvider in DbContext. This method encrypts string properties decorated with [Encrypted] upon saving and decrypts them upon reading.

```csharp
public class UserEntity
{
	public int Id { get; set; }
	
	[Encrypted]
	public string Username { get; set; }
	
	[Encrypted]
	public string Password { get; set; }
	
	public int Age { get; set; }
}

public class DatabaseContext : DbContext
{
	// Get key and IV from a Base64String or any other ways.
	// You can generate a key and IV using "AesProvider.GenerateKey()"
	private readonly byte[] _encryptionKey = ...; 
	private readonly byte[] _encryptionIV = ...;
	private readonly IEncryptionProvider _provider;

	public DbSet<UserEntity> Users { get; set; }
	
	public DatabaseContext(DbContextOptions options)
		: base(options)
	{
		_provider = new AesProvider(this._encryptionKey, this._encryptionIV);
	}
	
	protected override void OnModelCreating(ModelBuilder modelBuilder)
	{
		modelBuilder.UseEncryption(_provider);
	}
}
```

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