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<title>Class RoomCrypto | EchoHub Documentation </title>
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<meta name="description" content="Client-side envelope encryption for private (end-to-end encrypted) channels. Design: at creation the client generates a random 256-bit room content key (RCK) that encrypts all room content. The RCK is stored on the server wrapped (AES-GCM encrypted) by a key derived from the passphrase, next to a BCrypt hash of a separately derived auth key used as the join gate. The passphrase, the key-encryption key, and the RCK never leave the client, so the server can gate joins and count/measure content without being able to read it. Changing the passphrase only re-wraps the RCK — history is never re-encrypted. Derivation: PBKDF2-SHA256(passphrase, salt, 210000 iterations) → 64 bytes; first 32 bytes are the auth key (sent to the server as lowercase hex), last 32 bytes are the key-encryption key (never sent).">
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<article data-uid="EchoHub.Core.Security.RoomCrypto">
<h1 id="EchoHub_Core_Security_RoomCrypto" data-uid="EchoHub.Core.Security.RoomCrypto" class="text-break">
Class RoomCrypto <a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h1>
<div class="facts text-secondary">
<dl><dt>Namespace</dt><dd><a class="xref" href="EchoHub.html">EchoHub</a>.<a class="xref" href="EchoHub.Core.html">Core</a>.<a class="xref" href="EchoHub.Core.Security.html">Security</a></dd></dl>
<dl><dt>Assembly</dt><dd>EchoHub.Core.dll</dd></dl>
</div>
<div class="markdown summary"><p>Client-side envelope encryption for private (end-to-end encrypted) channels.</p>
<p>Design: at creation the client generates a random 256-bit room content key (RCK)
that encrypts all room content. The RCK is stored on the server <em>wrapped</em>
(AES-GCM encrypted) by a key derived from the passphrase, next to a BCrypt hash
of a separately derived auth key used as the join gate. The passphrase, the
key-encryption key, and the RCK never leave the client, so the server can gate
joins and count/measure content without being able to read it. Changing the
passphrase only re-wraps the RCK — history is never re-encrypted.</p>
<p>Derivation: PBKDF2-SHA256(passphrase, salt, 210000 iterations) → 64 bytes;
first 32 bytes are the auth key (sent to the server as lowercase hex),
last 32 bytes are the key-encryption key (never sent).</p>
</div>
<div class="markdown conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static class RoomCrypto</code></pre>
</div>
<dl class="typelist inheritance">
<dt>Inheritance</dt>
<dd>
<div><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object">object</a></div>
<div><span class="xref">RoomCrypto</span></div>
</dd>
</dl>
<dl class="typelist inheritedMembers">
<dt>Inherited Members</dt>
<dd>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gettype">object.GetType()</a>
</div>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone">object.MemberwiseClone()</a>
</div>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.tostring">object.ToString()</a>
</div>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object)">object.Equals(object)</a>
</div>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)">object.Equals(object, object)</a>
</div>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.referenceequals">object.ReferenceEquals(object, object)</a>
</div>
<div>
<a class="xref" href="https://learn.microsoft.com/dotnet/api/system.object.gethashcode">object.GetHashCode()</a>
</div>
</dd></dl>
<h2 class="section" id="fields">Fields
</h2>
<h3 id="EchoHub_Core_Security_RoomCrypto_CiphertextPrefix" data-uid="EchoHub.Core.Security.RoomCrypto.CiphertextPrefix">
CiphertextPrefix
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public const string CiphertextPrefix = &quot;$RC1$&quot;</code></pre>
</div>
<h4 class="section">Field Value</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
</dl>
<h2 class="section" id="methods">Methods
</h2>
<a id="EchoHub_Core_Security_RoomCrypto_DecryptBytes_" data-uid="EchoHub.Core.Security.RoomCrypto.DecryptBytes*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_DecryptBytes_System_Byte___System_Byte___" data-uid="EchoHub.Core.Security.RoomCrypto.DecryptBytes(System.Byte[],System.Byte[])">
DecryptBytes(byte[], byte[])
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Decrypts a blob produced by <a class="xref" href="EchoHub.Core.Security.RoomCrypto.html#EchoHub_Core_Security_RoomCrypto_EncryptBytes_System_Byte___System_Byte___">EncryptBytes(byte[], byte[])</a>. Throws <span class="xref">System.Security.Cryptography.CryptographicException</span> on key mismatch.</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static byte[] DecryptBytes(byte[] blob, byte[] key)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>blob</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
<dt><code>key</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_DeriveKeys_" data-uid="EchoHub.Core.Security.RoomCrypto.DeriveKeys*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_DeriveKeys_System_String_System_Byte___" data-uid="EchoHub.Core.Security.RoomCrypto.DeriveKeys(System.String,System.Byte[])">
DeriveKeys(string, byte[])
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Derives the auth key (join gate credential) and key-encryption key from a passphrase.</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static RoomCrypto.DerivedKeys DeriveKeys(string passphrase, byte[] salt)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>passphrase</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
<dt><code>salt</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="EchoHub.Core.Security.RoomCrypto.html">RoomCrypto</a>.<a class="xref" href="EchoHub.Core.Security.RoomCrypto.DerivedKeys.html">DerivedKeys</a></dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_EncryptBytes_" data-uid="EchoHub.Core.Security.RoomCrypto.EncryptBytes*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_EncryptBytes_System_Byte___System_Byte___" data-uid="EchoHub.Core.Security.RoomCrypto.EncryptBytes(System.Byte[],System.Byte[])">
EncryptBytes(byte[], byte[])
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Encrypts a binary blob (file contents) with the room key: nonce||tag||ciphertext.</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static byte[] EncryptBytes(byte[] plaintext, byte[] key)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>plaintext</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
<dt><code>key</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_EncryptText_" data-uid="EchoHub.Core.Security.RoomCrypto.EncryptText*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_EncryptText_System_String_System_Byte___" data-uid="EchoHub.Core.Security.RoomCrypto.EncryptText(System.String,System.Byte[])">
EncryptText(string, byte[])
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Encrypts UTF-8 text with the room key. Output: $RC1$base64(nonce||tag||ciphertext).</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static string EncryptText(string plaintext, byte[] key)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>plaintext</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
<dt><code>key</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_GenerateRoomKey_" data-uid="EchoHub.Core.Security.RoomCrypto.GenerateRoomKey*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_GenerateRoomKey" data-uid="EchoHub.Core.Security.RoomCrypto.GenerateRoomKey">
GenerateRoomKey()
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static byte[] GenerateRoomKey()</code></pre>
</div>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_GenerateSalt_" data-uid="EchoHub.Core.Security.RoomCrypto.GenerateSalt*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_GenerateSalt" data-uid="EchoHub.Core.Security.RoomCrypto.GenerateSalt">
GenerateSalt()
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static byte[] GenerateSalt()</code></pre>
</div>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_IsRoomCiphertext_" data-uid="EchoHub.Core.Security.RoomCrypto.IsRoomCiphertext*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_IsRoomCiphertext_System_String_" data-uid="EchoHub.Core.Security.RoomCrypto.IsRoomCiphertext(System.String)">
IsRoomCiphertext(string?)
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"></div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static bool IsRoomCiphertext(string? content)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>content</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_TryDecryptText_" data-uid="EchoHub.Core.Security.RoomCrypto.TryDecryptText*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_TryDecryptText_System_String_System_Byte___System_String__" data-uid="EchoHub.Core.Security.RoomCrypto.TryDecryptText(System.String,System.Byte[],System.String@)">
TryDecryptText(string, byte[], out string)
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Decrypts text produced by <a class="xref" href="EchoHub.Core.Security.RoomCrypto.html#EchoHub_Core_Security_RoomCrypto_EncryptText_System_String_System_Byte___">EncryptText(string, byte[])</a>. Returns false when the input
is not room ciphertext or the key does not match.</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static bool TryDecryptText(string content, byte[] key, out string plaintext)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>content</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
<dt><code>key</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
<dt><code>plaintext</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_TryUnwrapRoomKey_" data-uid="EchoHub.Core.Security.RoomCrypto.TryUnwrapRoomKey*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_TryUnwrapRoomKey_System_String_System_Byte___System_Byte____" data-uid="EchoHub.Core.Security.RoomCrypto.TryUnwrapRoomKey(System.String,System.Byte[],System.Byte[]@)">
TryUnwrapRoomKey(string, byte[], out byte[])
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Unwraps the stored room content key. Returns false when the KEK (passphrase) is wrong.</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static bool TryUnwrapRoomKey(string wrappedRoomKey, byte[] kek, out byte[] roomKey)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>wrappedRoomKey</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
<dt><code>kek</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
<dt><code>roomKey</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a></dt>
<dd></dd>
</dl>
<a id="EchoHub_Core_Security_RoomCrypto_WrapRoomKey_" data-uid="EchoHub.Core.Security.RoomCrypto.WrapRoomKey*"></a>
<h3 id="EchoHub_Core_Security_RoomCrypto_WrapRoomKey_System_Byte___System_Byte___" data-uid="EchoHub.Core.Security.RoomCrypto.WrapRoomKey(System.Byte[],System.Byte[])">
WrapRoomKey(byte[], byte[])
<a class="header-action link-secondary" title="View source" href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs"><i class="bi bi-code-slash"></i></a>
</h3>
<div class="markdown level1 summary"><p>Wraps the room content key under the key-encryption key for server storage.</p>
</div>
<div class="markdown level1 conceptual"></div>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public static string WrapRoomKey(byte[] roomKey, byte[] kek)</code></pre>
</div>
<h4 class="section">Parameters</h4>
<dl class="parameters">
<dt><code>roomKey</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
<dt><code>kek</code> <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.byte">byte</a>[]</dt>
<dd></dd>
</dl>
<h4 class="section">Returns</h4>
<dl class="parameters">
<dt><a class="xref" href="https://learn.microsoft.com/dotnet/api/system.string">string</a></dt>
<dd></dd>
</dl>
</article>
<div class="contribution d-print-none">
<a href="https://github.com/HueByte/EchoHub/blob/master/src/EchoHub.Core/Security/RoomCrypto.cs" class="edit-link">Edit this page</a>
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<div class='footer-custom'><div class='footer-inner'><span class='footer-brand'>EchoHub</span><span class='footer-sep'>&middot;</span><a href='https://github.com/HueByte/EchoHub'>GitHub</a><span class='footer-sep'>&middot;</span><a href='https://echohub.voidcube.cloud'>Website</a></div></div>
</div>
</div>
</footer>
</body>
</html>
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