From 104e72999c5993d241670887b91217aec13cbcf3 Mon Sep 17 00:00:00 2001
From: Ryan Fleury <ryan.j.fleury@gmail.com>
Date: Thu, 2 Oct 2025 16:20:34 -0700
Subject: [PATCH] base layer hashing algorithms, fill out md5

---
 src/base/base_hash.c | 36 ++++++++++++++++++++++++++++++++++++
 src/base/base_hash.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
 src/base/base_inc.c  |  1 +
 src/base/base_inc.h  |  1 +
 4 files changed, 82 insertions(+)
 create mode 100644 src/base/base_hash.c
 create mode 100644 src/base/base_hash.h

diff --git a/src/base/base_hash.c b/src/base/base_hash.c
new file mode 100644
index 00000000..664b4710
--- /dev/null
+++ b/src/base/base_hash.c
@@ -0,0 +1,36 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+////////////////////////////////
+//~ rjf: Hash Functions
+
+#if !defined(MD5_API)
+# define MD5_API static
+# include "third_party/md5/md5.c"
+# include "third_party/md5/md5.h"
+#endif
+
+internal MD5
+md5_from_data(String8 data)
+{
+  MD5_CTX ctx = {0};
+  MD5_Init(&ctx);
+  MD5_Update(&ctx, (void*)data.str, data.size);
+  MD5 result = {0};
+  MD5_Final(result.u8, &ctx);
+  return result;
+}
+
+internal SHA1
+sha1_from_data(String8 data)
+{
+  SHA1 result = {0};
+  return result;
+}
+
+internal SHA256
+sha256_from_data(String8 data)
+{
+  SHA256 result = {0};
+  return result;
+}
diff --git a/src/base/base_hash.h b/src/base/base_hash.h
new file mode 100644
index 00000000..55149541
--- /dev/null
+++ b/src/base/base_hash.h
@@ -0,0 +1,44 @@
+// Copyright (c) Epic Games Tools
+// Licensed under the MIT license (https://opensource.org/license/mit/)
+
+#ifndef BASE_HASH_H
+#define BASE_HASH_H
+
+////////////////////////////////
+//~ rjf: Hash Result Types
+
+typedef union MD5 MD5;
+union MD5
+{
+  U8 u8[16];
+  U16 u16[8];
+  U32 u32[4];
+  U64 u64[2];
+  U128 u128;
+};
+
+typedef union SHA1 SHA1;
+union SHA1
+{
+  U8 u8[20];
+};
+
+typedef union SHA256 SHA256;
+union SHA256
+{
+  U8 u8[32];
+  U16 u16[16];
+  U32 u32[8];
+  U64 u64[4];
+  U128 u128[2];
+  U256 u256;
+};
+
+////////////////////////////////
+//~ rjf: Hash Functions
+
+internal MD5 md5_from_data(String8 data);
+internal SHA1 sha1_from_data(String8 data);
+internal SHA256 sha256_from_data(String8 data);
+
+#endif // BASE_HASH_H
diff --git a/src/base/base_inc.c b/src/base/base_inc.c
index 7e9462f5..84444597 100644
--- a/src/base/base_inc.c
+++ b/src/base/base_inc.c
@@ -12,6 +12,7 @@
 #include "base_arena.c"
 #include "base_math.c"
 #include "base_strings.c"
+#include "base_hash.c"
 #include "base_threads.c"
 #include "base_thread_context.c"
 #include "base_command_line.c"
diff --git a/src/base/base_inc.h b/src/base/base_inc.h
index 4bf367da..1647d03a 100644
--- a/src/base/base_inc.h
+++ b/src/base/base_inc.h
@@ -14,6 +14,7 @@
 #include "base_arena.h"
 #include "base_math.h"
 #include "base_strings.h"
+#include "base_hash.h"
 #include "base_threads.h"
 #include "base_thread_context.h"
 #include "base_command_line.h"