1 files changed, 44 insertions, 0 deletions

diff --git a/src/lib/libcrypto/modes/gcm128_amd64.c b/src/lib/libcrypto/modes/gcm128_amd64.c
new file mode 100644
index 0000000000..eaa66fb32f
--- /dev/null
+++ b/src/lib/libcrypto/modes/gcm128_amd64.c
@@ -0,0 +1,44 @@
+/* $OpenBSD: gcm128_amd64.c,v 1.1 2025/06/28 12:39:10 jsing Exp $ */
+/*
+ * Copyright (c) 2025 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "crypto_arch.h"
+#include "modes_local.h"
+
+void gcm_init_4bit(u128 Htable[16], uint64_t H[2]);
+void gcm_gmult_4bit(uint64_t Xi[2], const u128 Htable[16]);
+void gcm_ghash_4bit(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
+    size_t len);
+
+void gcm_init_clmul(u128 Htable[16], const uint64_t Xi[2]);
+void gcm_gmult_clmul(uint64_t Xi[2], const u128 Htable[16]);
+void gcm_ghash_clmul(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
+    size_t len);
+
+void
+gcm128_init(GCM128_CONTEXT *ctx)
+{
+        if ((crypto_cpu_caps_amd64 & CRYPTO_CPU_CAPS_AMD64_CLMUL) != 0) {
+                gcm_init_clmul(ctx->Htable, ctx->H.u);
+                ctx->gmult = gcm_gmult_clmul;
+                ctx->ghash = gcm_ghash_clmul;
+                return;
+        }
+
+        gcm_init_4bit(ctx->Htable, ctx->H.u);
+        ctx->gmult = gcm_gmult_4bit;
+        ctx->ghash = gcm_ghash_4bit;
+}