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    <p>Here is a full implementation of a persistence unaware SecuredPassword class</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; public class SecuredPassword { private const int saltSize = 256; private readonly byte[] hash; private readonly byte[] salt; public byte[] Hash { get { return hash; } } public byte[] Salt { get { return salt; } } public SecuredPassword(string plainPassword) { if (string.IsNullOrWhiteSpace(plainPassword)) return; using (var deriveBytes = new Rfc2898DeriveBytes(plainPassword, saltSize)) { salt = deriveBytes.Salt; hash = deriveBytes.GetBytes(saltSize); } } public SecuredPassword(byte[] hash, byte[] salt) { this.hash = hash; this.salt = salt; } public bool Verify(string password) { if (string.IsNullOrWhiteSpace(password)) return false; using (var deriveBytes = new Rfc2898DeriveBytes(password, salt)) { byte[] newKey = deriveBytes.GetBytes(saltSize); return newKey.SequenceEqual(hash); } } } </code></pre> <p>And tests:</p> <pre><code> public class SecuredPasswordTests { [Test] public void IsHashed_AsExpected() { var securedPassword = new SecuredPassword("password"); Assert.That(securedPassword.Hash, Is.Not.EqualTo("password")); Assert.That(securedPassword.Hash.Length, Is.EqualTo(256)); } [Test] public void Generates_Unique_Salt() { var securedPassword = new SecuredPassword("password"); var securedPassword2 = new SecuredPassword("password"); Assert.That(securedPassword.Salt, Is.Not.Null); Assert.That(securedPassword2.Salt, Is.Not.Null); Assert.That(securedPassword.Salt, Is.Not.EqualTo(securedPassword2.Salt)); } [Test] public void Generates_Unique_Hash() { var securedPassword = new SecuredPassword("password"); var securedPassword2 = new SecuredPassword("password"); Assert.That(securedPassword.Hash, Is.Not.Null); Assert.That(securedPassword2.Hash, Is.Not.Null); Assert.That(securedPassword.Hash, Is.Not.EqualTo(securedPassword2.Hash)); } [Test] public void Verify_WhenMatching_ReturnsTrue() { var securedPassword = new SecuredPassword("password"); var result = securedPassword.Verify("password"); Assert.That(result, Is.True); } [Test] public void Verify_WhenDifferent_ReturnsFalse() { var securedPassword = new SecuredPassword("password"); var result = securedPassword.Verify("Password"); Assert.That(result, Is.False); } [Test] public void Verify_WhenRehydrated_AndMatching_ReturnsTrue() { var securedPassword = new SecuredPassword("password123"); var rehydrated = new SecuredPassword(securedPassword.Hash, securedPassword.Salt); var result = rehydrated.Verify("password123"); Assert.That(result, Is.True); } [Test] public void Constructor_Handles_Null_Password() { Assert.DoesNotThrow(() =&gt; new SecuredPassword(null)); } [Test] public void Constructor_Handles_Empty_Password() { Assert.DoesNotThrow(() =&gt; new SecuredPassword(string.Empty)); } [Test] public void Verify_Handles_Null_Password() { Assert.DoesNotThrow(() =&gt; new SecuredPassword("password").Verify(null)); } [Test] public void Verify_Handles_Empty_Password() { Assert.DoesNotThrow(() =&gt; new SecuredPassword("password").Verify(string.Empty)); } [Test] public void Verify_When_Null_Password_ReturnsFalse() { Assert.That(new SecuredPassword("password").Verify(null), Is.False); } } </code></pre>
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    1. POHashing passwords with MD5 or sha-256 C#
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    1. USSam Shiles
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    1. This table or related slice is empty.
 

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