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New preprocessor symbol indicating that AESNI support is present

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The configuration symbol MBEDTLS_AESNI_C requests AESNI support, but it is
ignored if the platform doesn't have AESNI. This allows keeping
MBEDTLS_AESNI_C enabled (as it is in the default build) when building for
platforms other than x86_64, or when MBEDTLS_HAVE_ASM is disabled.

To facilitate maintenance, always use the symbol MBEDTLS_AESNI_HAVE_CODE to
answer the question "can I call mbedtls_aesni_xxx functions?", rather than
repeating the check `defined(MBEDTLS_AESNI_C) && ...`.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2023-03-10 22:29:32 +01:00
committed by Tom Cosgrove
parent 2808a6047c
commit 5511a34566
3 changed files with 26 additions and 8 deletions
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22
include/mbedtls/aesni.h
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@@ -36,13 +36,30 @@
#define MBEDTLS_AESNI_AES 0x02000000u
#define MBEDTLS_AESNI_CLMUL 0x00000002u
#if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && \
#if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && \
(defined(__amd64__) || defined(__x86_64__)) && \
!defined(MBEDTLS_HAVE_X86_64)
#define MBEDTLS_HAVE_X86_64
#endif
#if defined(MBEDTLS_AESNI_C)
#if defined(MBEDTLS_HAVE_X86_64)
#define MBEDTLS_AESNI_HAVE_CODE // via assembly
#endif
#if defined(_MSC_VER)
#define MBEDTLS_HAVE_AESNI_INTRINSICS
#endif
#if defined(__GNUC__) && defined(__AES__)
#define MBEDTLS_HAVE_AESNI_INTRINSICS
#endif
#if defined(MBEDTLS_HAVE_AESNI_INTRINSICS)
#define MBEDTLS_AESNI_HAVE_CODE // via intrinsics
#endif
#if defined(MBEDTLS_AESNI_HAVE_CODE)
#ifdef __cplusplus
extern "C" {
@@ -131,6 +148,7 @@ int mbedtls_aesni_setkey_enc(unsigned char *rk,
}
#endif
#endif /* MBEDTLS_HAVE_X86_64 */
#endif /* MBEDTLS_AESNI_HAVE_CODE */
#endif /* MBEDTLS_AESNI_C */
#endif /* MBEDTLS_AESNI_H */