masking class added

Readme.md

@@ -1,25 +1,26 @@
 # 1. PandaTech.Crypto
 
-
 - [1. PandaTech.Crypto](#1-pandatechcrypto)
-  - [1.1. Introduction](#11-introduction)
-  - [1.2. Features](#12-features)
-  - [1.3. Installation](#13-installation)
-  - [1.4. How to Use](#14-how-to-use)
-    - [1.4.1. Configuring Dependency Injection](#141-configuring-dependency-injection)
-    - [1.4.2. AES256 Class](#142-aes256-class)
-      - [1.4.2.1. Immutable Configurations](#1421-immutable-configurations)
-      - [1.4.2.2. Encryption/Decryption methods with hashing](#1422-encryptiondecryption-methods-with-hashing)
-      - [1.4.2.3. Encryption/Decryption methods without hashing](#1423-encryptiondecryption-methods-without-hashing)
-      - [1.4.2.4. Encryption/Decryption methods with custom key (overriding options for one time)](#1424-encryptiondecryption-methods-with-custom-key-overriding-options-for-one-time)
-    - [1.4.3. Argon2id Class](#143-argon2id-class)
-      - [1.4.3.1. Default Configurations](#1431-default-configurations)
-      - [1.4.3.2 Hash password and verify hash](#1432-hash-password-and-verify-hash)
-    - [1.4.4. Random Class](#144-random-class)
-    - [1.4.5. Password Class](#145-password-class)
-    - [1.4.6. Sha3 Class](#146-sha3-class)
-    - [1.4.7. GZip Class](#147-gzip-class)
-  - [1.5. License](#15-license)
+    - [1.1. Introduction](#11-introduction)
+    - [1.2. Features](#12-features)
+    - [1.3. Installation](#13-installation)
+    - [1.4. How to Use](#14-how-to-use)
+        - [1.4.1. Configuring Dependency Injection](#141-configuring-dependency-injection)
+        - [1.4.2. AES256 Class](#142-aes256-class)
+            - [1.4.2.1. Immutable Configurations](#1421-immutable-configurations)
+            - [1.4.2.2. Encryption/Decryption methods with hashing](#1422-encryptiondecryption-methods-with-hashing)
+            - [1.4.2.3. Encryption/Decryption methods without hashing](#1423-encryptiondecryption-methods-without-hashing)
+            - [1.4.2.4. Encryption/Decryption methods with custom key (overriding options for one time)](#1424-encryptiondecryption-methods-with-custom-key-overriding-options-for-one-time)
+        - [1.4.3. Argon2id Class](#143-argon2id-class)
+            - [1.4.3.1. Default Configurations](#1431-default-configurations)
+            - [1.4.3.2 Hash password and verify hash](#1432-hash-password-and-verify-hash)
+        - [1.4.4. Random Class](#144-random-class)
+        - [1.4.5. Password Class](#145-password-class)
+        - [1.4.6. Sha3 Class](#146-sha3-class)
+        - [1.4.7. GZip Class](#147-gzip-class)
+        - [1.4.8. Mask Class](#148-mask-class)
+            - [1.4.8.1. Masking Email Addresses](#1481-masking-email-addresses)
+    - [1.5. License](#15-license)
 
 ## 1.1. Introduction
 
@@ -44,6 +45,8 @@ resources—hash generation takes under 500ms on a container with 1 vCore and 1G
   specific character sets.
 * **GZip Compression/Decompression:** Efficiently compress and decompress data using GZip, with support for byte arrays
   and streams.
+* **Masking:** Mask sensitive information like email addresses and phone numbers, ensuring that they are partially
+  hidden and thus safeguarded.
 * **Performance Optimized:** Tested to run efficiently in resource-constrained environments.
 * **High Test Coverage:** Confidence backed by 99% unit test coverage.
 
@@ -163,9 +166,11 @@ var isHashValid = Sha3.VerifyHash("yourPlainText", sha3Hash);
 ### 1.4.7. GZip Class
 
 Compression and Decompression
-The `GZip` class provides methods for compressing and decompressing data using GZip. It supports operations on strings, byte arrays, and streams.
+The `GZip` class provides methods for compressing and decompressing data using GZip. It supports operations on strings,
+byte arrays, and streams.
 
 Example usage for compressing and decompressing a string:
+
 ```csharp
 using Pandatech.Crypto;
 
@@ -175,7 +180,27 @@ byte[] compressedData = GZip.Compress(data);
 
 // Decompress back to string
 string decompressedData = Encoding.UTF8.GetString(GZip.Decompress(compressedData));
+```
+
+### 1.4.8. Mask Class
+
+The `Mask` class in the PandaTech.Crypto library provides methods to mask sensitive information like email addresses and
+phone numbers, ensuring that they are partially hidden and thus safeguarded.
+
+#### 1.4.8.1. Masking Email Addresses
+
+The `MaskEmail` method masks the local part of an email address, showing only the first two characters and replacing the
+rest with asterisks (*), keeping the domain part intact.
+
+```csharp
+// Example usage for masking an email
+string maskedEmail = Mask.MaskEmail("[email protected]");
+
+// Output: "ex*****@email.com"
+// Example usage for masking a phone number
+string maskedPhone = Mask.MaskPhoneNumber("1234567890");
 
+// Output: "******7890"
 ```
 
 ## 1.5. License

src/Pandatech.Crypto.Tests/MaskTests.cs

@@ -0,0 +1,45 @@
+namespace Pandatech.Crypto.Tests;
+
+using Xunit;
+using Crypto;
+using System;
+
+public class MaskTests
+{
+    [Theory]
+    [InlineData("[email protected]", "va***************@vazgen.com")]
+    [InlineData("[email protected]", "te**@example.com")]
+    [InlineData("[email protected]", "[email protected]")]
+    [InlineData("[email protected]", "[email protected]")]
+    public void MaskEmail_ValidEmails_ReturnsMaskedEmail(string input, string expected)
+    {
+        var result = Mask.MaskEmail(input);
+        Assert.Equal(expected, result);
+    }
+
+    [Theory]
+    [InlineData("")]
+    [InlineData("notanemail")]
+    public void MaskEmail_InvalidEmails_ThrowsArgumentException(string input)
+    {
+        Assert.Throws<ArgumentException>(() => Mask.MaskEmail(input));
+    }
+
+    [Theory]
+    [InlineData("1234567890", "******7890")]
+    [InlineData("1234", "1234")]
+    [InlineData("12", "12")]
+    public void MaskPhoneNumber_ValidPhoneNumbers_ReturnsMaskedPhone(string input, string expected)
+    {
+        var result = Mask.MaskPhoneNumber(input);
+        Assert.Equal(expected, result);
+    }
+
+    [Theory]
+    [InlineData(null)]
+    [InlineData("")]
+    public void MaskPhoneNumber_InvalidPhoneNumbers_ThrowsArgumentException(string input)
+    {
+        Assert.Throws<ArgumentException>(() => Mask.MaskPhoneNumber(input));
+    }
+}

src/Pandatech.Crypto/Mask.cs

@@ -0,0 +1,34 @@
+using RegexBox;
+
+namespace Pandatech.Crypto;
+
+public static class Mask
+{
+    public static string MaskEmail(string email)
+    {
+        if (!PandaValidator.IsEmail(email))
+        {
+            throw new ArgumentException("Invalid email address", nameof(email));
+        }
+
+        var parts = email.Split('@');
+        var localPart = parts[0];
+        var domainPart = parts[1];
+
+        var maskedLocalPart =
+            localPart.Length <= 2 ? localPart : localPart[..2] + new string('*', localPart.Length - 2);
+        return $"{maskedLocalPart}@{domainPart}";
+    }
+
+    public static string MaskPhoneNumber(string phoneNumber)
+    {
+        if (string.IsNullOrEmpty(phoneNumber))
+        {
+            throw new ArgumentException("Invalid phone number", nameof(phoneNumber));
+        }
+
+        return phoneNumber.Length <= 4
+            ? phoneNumber
+            : string.Concat(new string('*', phoneNumber.Length - 4), phoneNumber.AsSpan(phoneNumber.Length - 4));
+    }
+}

src/Pandatech.Crypto/Pandatech.Crypto.csproj

@@ -8,12 +8,12 @@
         <Copyright>MIT</Copyright>
         <PackageIcon>pandatech.png</PackageIcon>
         <PackageReadmeFile>Readme.md</PackageReadmeFile>
-        <Version>2.2.4</Version>
+        <Version>2.2.5</Version>
         <Title>Pandatech.Crypto</Title>
         <PackageTags>Pandatech, library, encryption, hash, algorythms, security</PackageTags>
         <Description>PandaTech.Crypto is a .NET library simplifying common cryptograhic functions.</Description>
         <RepositoryUrl>https://github.com/PandaTechAM/be-lib-pandatech-crypto</RepositoryUrl>
-        <PackageReleaseNotes>Added GZip compression</PackageReleaseNotes>
+        <PackageReleaseNotes>Added Mask class</PackageReleaseNotes>
     </PropertyGroup>
 
     <ItemGroup>
@@ -25,6 +25,7 @@
       <PackageReference Include="BouncyCastle.NetCore" Version="2.2.1" />
       <PackageReference Include="Konscious.Security.Cryptography.Argon2" Version="1.3.0" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
+      <PackageReference Include="Pandatech.RegexBox" Version="1.1.4" />
     </ItemGroup>
 
 </Project>