Simplify EVP AES-GCM implementation and remove AES-NI specific code.

Like CTR, the mode implementation for GCM has two variants - rather than
using multiple variants (one for AES-NI, another for non-AES-NI),
consistently use CRYPTO_gcm128_{en,de}crypt_ctr32() with the
aes_ctr32_encrypt_internal() function added for CTR mode.

This lets us remove the AES-NI specific code, AES-NI specific EVP_CIPHER
methods and the ctr function pointer from EVP_AES_GCM_CTX.

ok tb@

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/libcrypto/aes/aes_local.h b/src/lib/libcrypto/aes/aes_local.h
index dab12ed3f9..f9bd363802 100644
--- a/src/lib/libcrypto/aes/aes_local.h
+++ b/src/lib/libcrypto/aes/aes_local.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: aes_local.h,v 1.6 2025/06/27 16:43:54 jsing Exp $ */
+/* $OpenBSD: aes_local.h,v 1.7 2025/06/27 17:26:57 jsing Exp $ */
 /* ====================================================================
  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  *
@@ -63,6 +63,9 @@ __BEGIN_HIDDEN_DECLS
 /* This controls loop-unrolling in aes_core.c */
 #undef FULL_UNROLL
 
+void aes_ctr32_encrypt_ctr128f(const unsigned char *in, unsigned char *out,
+    size_t blocks, const void *key, const unsigned char ivec[AES_BLOCK_SIZE]);
+
 __END_HIDDEN_DECLS
 
 #endif /* !HEADER_AES_LOCAL_H */