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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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6
library/aes.c
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@@ -550,7 +550,7 @@ int mbedtls_aes_setkey_enc(mbedtls_aes_context *ctx, const unsigned char *key,
#endif
ctx->rk = RK = ctx->buf;
#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
#if defined(MBEDTLS_AESNI_HAVE_CODE)
if (mbedtls_aesni_has_support(MBEDTLS_AESNI_AES)) {
return mbedtls_aesni_setkey_enc((unsigned char *) ctx->rk, key, keybits);
}
@@ -658,7 +658,7 @@ int mbedtls_aes_setkey_dec(mbedtls_aes_context *ctx, const unsigned char *key,
ctx->nr = cty.nr;
#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
#if defined(MBEDTLS_AESNI_HAVE_CODE)
if (mbedtls_aesni_has_support(MBEDTLS_AESNI_AES)) {
mbedtls_aesni_inverse_key((unsigned char *) ctx->rk,
(const unsigned char *) cty.rk, ctx->nr);
@@ -978,7 +978,7 @@ int mbedtls_aes_crypt_ecb(mbedtls_aes_context *ctx,
AES_VALIDATE_RET(mode == MBEDTLS_AES_ENCRYPT ||
mode == MBEDTLS_AES_DECRYPT);
#if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
#if defined(MBEDTLS_AESNI_HAVE_CODE)
if (mbedtls_aesni_has_support(MBEDTLS_AESNI_AES)) {
return mbedtls_aesni_crypt_ecb(ctx, mode, input, output);
}