Add pbkdf2 password hashing tool (#716)

* Add pbkdf2 password hashing tool

* Binaries

Author: anikammsft

samples/features/sql-big-data-cluster/security/password-hashing/pbkdf2/.gitignore

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+bin/
+obj/

samples/features/sql-big-data-cluster/security/password-hashing/pbkdf2/Program.cs

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+using Microsoft.AspNet.Cryptography.KeyDerivation;
+using System;
+using System.Linq;
+
+namespace pbkdf2
+{
+    class Program
+    {
+        /// <summary>
+        /// Main method
+        /// </summary>
+        static void Main(string[] args)
+        {
+            if (args.Length < 2)
+            {
+                PrintUsage();
+                System.Environment.Exit(1);
+            }
+
+            string password = args[0];
+            string hexSalt = args[1];
+
+            byte[] salt = StringToByteArray(hexSalt);
+            Console.WriteLine(GetHashedPassword(password, salt));
+        }
+
+        /// <summary>
+        /// Convert hex string to byte array
+        /// </summary>
+        /// <param name="hex">Hexadecimal string</param>
+        /// <returns>Byte array representation of the string</returns>
+        private static byte[] StringToByteArray(string hex) => Enumerable.Range(0, hex.Length)
+                .Where(x => x % 2 == 0)
+                .Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
+                .ToArray();
+
+        /// <summary>
+        /// Generate hashed password with the given salt
+        /// </summary>
+        /// <param name="password">Password to be hashed</param>
+        /// <param name="salt">Byte array of salt</param>
+        /// <returns>Hashed and salted password</returns>
+        private static string GetHashedPassword(String password, byte[] salt)
+        {
+            // Derive a 32 bytes subkey (use HMACSHA1 with 10,000 iterations)
+            //
+            return Convert.ToBase64String(KeyDerivation.Pbkdf2(
+                password: password,
+                salt: salt,
+                prf: KeyDerivationPrf.HMACSHA1,
+                iterationCount: 10000,
+                numBytesRequested: 32));
+        }
+
+        /// <summary>
+        /// Prints usage of the program
+        /// </summary>
+        private static void PrintUsage()
+        {
+            Console.WriteLine("Usage:");
+            Console.WriteLine("pbkdf2 <password> <hex salt>");
+        }
+    }
+}

samples/features/sql-big-data-cluster/security/password-hashing/pbkdf2/README.md

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+# PBKDF2
+
+PBKDF2 (Password-Based Key Derivation Function 2) is a password hashing mechanism. This tool takes in a password and a hexadecimal string as a salt to generate a hash of the password.
+
+## Building and using the pbkdf2 tool
+
+### Pre-requisites
+.NET Core installation is required to build the project.
+.NET Core can be downloaded from [here](https://dotnet.microsoft.com/download).
+
+### Build Instructions
+* For building a Windows 10 binary, run "dotnet publish -c Release -r win10-x64"
+* For building an Ubuntu Linux binary, run "dotnet publish -c Release -r ubuntu.16.04-x64"
+* For building an OSX binary, run "dotnet publish -c Release -r osx-x64"
+
+Upon running the above command(s), a self-contained package will be built under bin/Release folder. You may directly run the binary from there.
+

samples/features/sql-big-data-cluster/security/password-hashing/pbkdf2/pbkdf2.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <RuntimeIdentifiers>win10-x64;ubuntu.16.04-x64;osx-x64</RuntimeIdentifiers>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNet.Cryptography.Internal" Version="1.0.0-rc1-final" />
+    <PackageReference Include="Microsoft.AspNet.Cryptography.KeyDerivation" Version="1.0.0-rc1-final" />
+  </ItemGroup>
+
+</Project>