From 1a927ccb44b436529c643223403943f2db0585b0 Mon Sep 17 00:00:00 2001
From: Capri <caprimc@yahoo.com>
Date: Sun, 13 Sep 2026 17:02:13 +0000
Subject: [PATCH] Add RandomX hashing wrapper

---
 src/Makefile.am             |  2 ++
 src/crypto/randomx_hash.cpp | 35 +++++++++++++++++++++++++++++++++++
 src/crypto/randomx_hash.h   | 24 ++++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 src/crypto/randomx_hash.cpp
 create mode 100644 src/crypto/randomx_hash.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 99c74f9..7f1c40b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -550,6 +550,8 @@ libvexta_consensus_a_SOURCES = \
   crypto/jh.cpp \
   crypto/keccak.cpp \
   crypto/luffa.cpp \
+  crypto/randomx_hash.cpp \
+  crypto/randomx_hash.h \
   crypto/shavite.cpp \
   crypto/simd.cpp \
   crypto/hashodo.h \
diff --git a/src/crypto/randomx_hash.cpp b/src/crypto/randomx_hash.cpp
new file mode 100644
index 0000000..83a4e27
--- /dev/null
+++ b/src/crypto/randomx_hash.cpp
@@ -0,0 +1,35 @@
+#include <crypto/randomx_hash.h>
+
+#include <randomx.h>
+
+bool VextaRandomXHash(
+    const void* input,
+    std::size_t input_size,
+    const void* key,
+    std::size_t key_size,
+    uint8_t output[VEXTA_RANDOMX_HASH_SIZE])
+{
+    randomx_cache* cache = randomx_alloc_cache(RANDOMX_FLAG_DEFAULT);
+    if (cache == nullptr) {
+        return false;
+    }
+
+    randomx_init_cache(cache, key, key_size);
+
+    randomx_vm* vm = randomx_create_vm(
+        RANDOMX_FLAG_DEFAULT,
+        cache,
+        nullptr);
+
+    if (vm == nullptr) {
+        randomx_release_cache(cache);
+        return false;
+    }
+
+    randomx_calculate_hash(vm, input, input_size, output);
+
+    randomx_destroy_vm(vm);
+    randomx_release_cache(cache);
+
+    return true;
+}
diff --git a/src/crypto/randomx_hash.h b/src/crypto/randomx_hash.h
new file mode 100644
index 0000000..ca2150a
--- /dev/null
+++ b/src/crypto/randomx_hash.h
@@ -0,0 +1,24 @@
+#ifndef VEXTA_CRYPTO_RANDOMX_HASH_H
+#define VEXTA_CRYPTO_RANDOMX_HASH_H
+
+#include <cstddef>
+#include <cstdint>
+
+static constexpr std::size_t VEXTA_RANDOMX_HASH_SIZE = 32;
+
+/**
+ * Calculate a RandomX hash using an explicit key.
+ *
+ * This wrapper intentionally uses RANDOMX_FLAG_DEFAULT so consensus hashing
+ * does not depend on CPU-specific runtime feature detection.
+ *
+ * Returns false if RandomX cache or VM allocation fails.
+ */
+bool VextaRandomXHash(
+    const void* input,
+    std::size_t input_size,
+    const void* key,
+    std::size_t key_size,
+    uint8_t output[VEXTA_RANDOMX_HASH_SIZE]);
+
+#endif // VEXTA_CRYPTO_RANDOMX_HASH_H