Require SSE in order to use gcm_{gmult,ghash}_4bit_mmx().

Contrary to naming, the '"June" MMX version' of gcm_ghash_4bit_mmx() uses
SSE, while the 'pure-MMX "May" version' does not. This detail got missed
when I was untangling OPENSSL_IA32_SSE2.

Found the hard way by Tate Baldwin and Dennis Camera.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libcrypto/modes/gcm128_i386.c b/src/lib/libcrypto/modes/gcm128_i386.c
index ac517fdb04..14b0b9ce64 100644
--- a/src/lib/libcrypto/modes/gcm128_i386.c
+++ b/src/lib/libcrypto/modes/gcm128_i386.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: gcm128_i386.c,v 1.1 2025/06/28 12:39:10 jsing Exp $ */
+/* $OpenBSD: gcm128_i386.c,v 1.2 2025/12/31 10:16:24 jsing Exp $ */
 /*
  * Copyright (c) 2025 Joel Sing <jsing@openbsd.org>
  *
@@ -43,7 +43,7 @@ gcm128_init(GCM128_CONTEXT *ctx)
                 return;
         }
 
-        if ((crypto_cpu_caps_i386 & CRYPTO_CPU_CAPS_I386_MMX) != 0) {
+        if ((crypto_cpu_caps_i386 & CRYPTO_CPU_CAPS_I386_SSE) != 0) {
                 gcm_init_4bit(ctx->Htable, ctx->H.u);
                 ctx->gmult = gcm_gmult_4bit_mmx;
                 ctx->ghash = gcm_ghash_4bit_mmx;