Docs - Add initial state of String Encryption

docs/en/String-Encryption.md

@@ -1,4 +1,135 @@
-# String Encryption
+# String Encryption
 
-TODO!
+ABP Framework provides string encryption feature that allows to **Encrypt** and **Decrypt** strings.
 
+
+
+##  Installation
+
+> This package is already installed by default with the startup template. So, most of the time, you don't need to install it manually.
+
+If installation is needed, it is suggested to use the [ABP CLI](https://docs.abp.io/en/abp/latest/CLI) to install this package.
+
+### Using the ABP CLI
+
+Open a command line window in the folder of the project (.csproj file) and type the following command:
+
+```bash
+abp add-package Volo.Abp.GlobalFeatures
+```
+
+### Manual Installation
+
+If you want to manually install;
+
+1. Add the [Volo.Abp.Security]([NuGet Gallery | Volo.Abp.Security 4.2.2](https://www.nuget.org/packages/Volo.Abp.Security)) NuGet package to your project:
+
+   `Install-Package Volo.Abp.Security`
+
+2. Add the `AbpSecurityModule` to the dependency list of your module:
+
+   ```csharp
+   [DependsOn(
+       //...other dependencies
+       typeof(AbpSecurityModule) // <-- Add module dependency like that
+       )]
+   public class YourModule : AbpModule
+   {
+   }
+   ```
+
+
+
+## Using String Encryption
+
+All encryption operations are included in `IStringEncryptionService`. You can inject it and start to use.
+
+```csharp
+ public class MyService : DomainService
+ {
+     public IStringEncryptionService StringEncryptionService { get; }
+
+     public MyAppService(IStringEncryptionService stringEncryptionService)
+     {
+         StringEncryptionService = stringEncryptionService;
+     }
+
+     public string Encrypt(string value)
+     {
+         // To enrcypt a value
+         return StringEncryptionService.Encrypt(value);
+     }
+
+     public string Decrpyt(string value)
+     {
+         // To decrypt a value
+         return StringEncryptionService.Decrypt(value);
+     }
+ }
+```
+
+
+
+### Using Custom PassPhrase
+
+`IStringEncryptionService` methods has **passPharase** parameter with default value and it uses default PassPhrase when you don't pass passPhrase parameter. 
+
+Default value is `gsKnGZ041HLL4IM8`
+
+```csharp
+StringEncryptionService.Encrypt(value); // Default Pass Phrase
+StringEncryptionService.Encrypt(value, "MyCustomPassPhrase"); // Custom Pass Phrase
+
+// Encrypt & Decrypt have same parameters.
+StringEncryptionService.Decrypt(value, "MyCustomPassPhrase");
+```
+
+
+
+### Using Custom Salt
+
+`IStringEncryptionService` methods has **salt** parameter with default value and it uses default Salt when you don't pass the parameter.
+
+Default value is `Encoding.ASCII.GetBytes("hgt!16kl")`
+
+```csharp
+StringEncryptionService.Encrypt(value); // Default Salt
+StringEncryptionService.Encrypt(value, salt: Encoding.UTF8.GetBytes("MyCustomSalt")); // Custom Salt
+
+// Encrypt & Decrypt have same parameters.
+StringEncryptionService.Decrypt(value,  salt: Encoding.UTF8.GetBytes("MyCustomSalt"));
+```
+
+
+
+***
+
+## String Encryption Options
+
+Default values can be configured with `AbpStringEncryptionOptions` type.
+
+```csharp
+Configure<AbpStringEncryptionOptions>(opts =>
+{
+    opts.DefaultPassPhrase = "MyStrongPassPhrase";
+    opts.DefaultSalt = Encoding.UTF8.GetBytes("MyStrongSalt");
+    opts.InitVectorBytes = Encoding.UTF8.GetBytes("YetAnotherStrongSalt");
+    opts.Keysize = 512;
+});
+```
+
+
+
+- **DefaultPassPhrase**: Default password to encrypt/decrypt texts. It's recommended to set to another value for security. Default value: `gsKnGZ041HLL4IM8`
+
+- **DefaultSalt**: A value which is used as salt while  encrypting/decrypting.
+
+  Default value: `Encoding.ASCII.GetBytes("hgt!16kl")`
+
+- **InitVectorBytes:** This constant string is used as a "salt" value for the PasswordDeriveBytes function calls. This size of the IV (in bytes) must = (keysize / 8). Default keysize is 256, so the IV must be 32 bytes long. Using a 16 character string here gives us 32 bytes when converted to a byte array. 
+
+  Default value: `Encoding.ASCII.GetBytes("jkE49230Tf093b42")`
+
+- **Keysize:** This constant is used to determine the keysize of the encryption algorithm.
+
+  Default value: `256`