Added options, readme, and nuget info

Author: scottbrady91

README.md

@@ -0,0 +1,24 @@
+# Scrypt Password Hasher for ASP.NET Core Identity (ASP.NET Identity 3)
+
+An implementation of IPasswordHasher<TUser> using [Scrypt.NET](https://github.com/viniciuschiele/Scrypt).
+
+## Installation
+
+```
+services.AddScoped<IPasswordHasher<ApplicationUser>, ScryptPasswordHasher<ApplicationUser>>();
+```
+
+### Options
+
+ - **IterationCount**: int
+ - **BlockSize**: int
+ - **ThreadCount**: int
+
+Register with:
+```
+services.Configure<ScryptPasswordHasherOptions>(options => {
+	options.IterationCount = 16384;
+	options.BlockSize = 8;
+	options.ThreadCount = 1;
+});
+```

src/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher.csproj

@@ -2,6 +2,17 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
+
+    <AssemblyName>ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher</AssemblyName>
+    <PackageId>ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher</PackageId>
+    <PackageVersion>1.0.0</PackageVersion>
+    <Authors>Scott Brady</Authors>
+    <Description>ASP.NET Core Identity IPasswordHasher implementation using Scrypt</Description>
+    <Copyright>Copyright (c) 2017 Scott Brady</Copyright>
+    <PackageTags>aspnetcore;identity;scrypt;password;hashing;hash;security</PackageTags>
+    <PackageIconUrl>https://www.scottbrady91.com/img/logos/scottbrady91.png</PackageIconUrl>
+    <PackageProjectUrl>https://github.com/scottbrady91/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher</PackageProjectUrl>
+    <PackageLicenseUrl>https://github.com/scottbrady91/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher/blob/master/LICENSE</PackageLicenseUrl>
   </PropertyGroup>
 
   <ItemGroup>

src/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher/ScryptPasswordHasher.cs

@@ -1,16 +1,24 @@
 using System;
 using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.Options;
 using Scrypt;
 
 namespace ScottBrady91.AspNetCore.Identity
 {
     public class ScryptPasswordHasher<TUser> : IPasswordHasher<TUser> where TUser : class
     {
+        private readonly ScryptPasswordHasherOptions options;
+
+        public ScryptPasswordHasher(IOptions<ScryptPasswordHasherOptions> optionsAccessor = null)
+        {
+            options = optionsAccessor?.Value ?? new ScryptPasswordHasherOptions();
+        }
+
         public string HashPassword(TUser user, string password)
         {
             if (password == null) throw new ArgumentNullException(nameof(password));
 
-            var encoder = new ScryptEncoder();
+            var encoder = new ScryptEncoder(options.IterationCount, options.BlockSize, options.ThreadCount);
             return encoder.Encode(password);
         }
 

src/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher/ScryptPasswordHasherOptions.cs

@@ -0,0 +1,9 @@
+namespace ScottBrady91.AspNetCore.Identity
+{
+    public class ScryptPasswordHasherOptions
+    {
+        public int IterationCount { get; set; } = 16384;
+        public int BlockSize { get; set; } = 8;
+        public int ThreadCount { get; set; } = 1;
+    }
+}

test/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher.Tests/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
+    <TargetFrameworks>netcoreapp2.0;net461</TargetFrameworks>
   </PropertyGroup>
 
   <ItemGroup>

test/ScottBrady91.AspNetCore.Identity.ScryptPasswordHasher.Tests/ScryptPasswordHasherTests.cs

@@ -1,6 +1,7 @@
 using System;
 using FluentAssertions;
 using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.Options;
 using Scrypt;
 using Xunit;
 
@@ -19,7 +20,26 @@ public void HashPassword_WithDefaultSettings_ExpectVerifiableHash()
             var encoder = new ScryptEncoder();
             encoder.Compare(password, hashedPassword).Should().BeTrue();
         }
-        
+
+        [Fact]
+        public void HashPassword_WithCustomSettings_ExpectVerifiableHash()
+        {
+            var random = new Random();
+            var iterationCount = (int)Math.Pow(2.00, random.Next(15, 20));
+            var blockSize = random.Next(9, 12);
+            const int threadCount = 2;
+
+            var password = Guid.NewGuid().ToString();
+
+            var hasher = new ScryptPasswordHasher<string>(
+                new OptionsWrapper<ScryptPasswordHasherOptions>(
+                    new ScryptPasswordHasherOptions {IterationCount = iterationCount, BlockSize = blockSize, ThreadCount = threadCount}));
+            var hashedPassword = hasher.HashPassword("", password);
+
+            var encoder = new ScryptEncoder();
+            encoder.Compare(password, hashedPassword).Should().BeTrue();
+        }
+
         [Fact]
         public void VerifyHashedPassword_WithDefaultSettings_ExpectSuccess()
         {
@@ -32,6 +52,23 @@ public void VerifyHashedPassword_WithDefaultSettings_ExpectSuccess()
             hasher.VerifyHashedPassword("", hashedPassword, password).Should().Be(PasswordVerificationResult.Success);
         }
 
+        [Fact]
+        public void VerifyHashedPassword_WithCustomSettings_ExpectSuccess()
+        {
+            var random = new Random();
+            var iterationCount = (int)Math.Pow(2.00, random.Next(15, 20));
+            var blockSize = random.Next(9, 12);
+            const int threadCount = 2;
+
+            var password = Guid.NewGuid().ToString();
+            var encoder = new ScryptEncoder(iterationCount, blockSize, threadCount);
+            var hashedPassword = encoder.Encode(password);
+
+            var hasher = new ScryptPasswordHasher<string>();
+
+            hasher.VerifyHashedPassword("", hashedPassword, password).Should().Be(PasswordVerificationResult.Success);
+        }
+
         [Fact]
         public void VerifyHashedPassword_WhenSuppliedPasswordDoesNotMatch_ExpectFailure()
         {