Basic hash context implementation

Author: tuokri

Classes/FCryptoContext.uc

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2024 Tuomo Kriikkula <tuokri@tuta.io>
+ * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+class FCryptoContext extends Object
+    abstract
+    notplaceable;
+
+struct FCryptoHashContext
+{
+    var int Count; // TODO: might need to use QWORD for this.
+};
+
+struct FCryptoSHA224Context extends FCryptoHashContext
+{
+};

Classes/FCryptoSHA2.uc

@@ -233,6 +233,19 @@ static final function Sha2SmallRound(
     Val[7] += h;
 }
 
+static final function Sha2SmallUpdate(
+    FCryptoSHA224Context Cc,
+    const out array<byte> Data,
+    int Len
+)
+{
+    local int Ptr;
+
+    // TODO: can we simply use 32 bit integers here?
+    // TODO: if not, use QWORDs?
+    Ptr = Cc.Count & 63;
+}
+
 // TODO: make this a macro for performance?
 static final function RangeDec32BE(
     out array<int> V,