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Document the new state of AESNI support

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-03-16 17:49:44 +01:00
parent 9c682e724a
commit 0bfccfa537
1 changed files with 22 additions and 4 deletions
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26
include/mbedtls/mbedtls_config.h
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@ -55,7 +55,7 @@
* library/padlock.h * library/padlock.h
* *
* Required by: * Required by:
* MBEDTLS_AESNI_C * MBEDTLS_AESNI_C (on some platforms)
* MBEDTLS_PADLOCK_C * MBEDTLS_PADLOCK_C
* *
* Comment to disable the use of assembly code. * Comment to disable the use of assembly code.
@ -2018,14 +2018,32 @@
/** /**
* \def MBEDTLS_AESNI_C * \def MBEDTLS_AESNI_C
* *
* Enable AES-NI support on x86-64. * Enable AES-NI support on x86-64 or x86-32.
*
* \note AESNI is only supported with certain compilers and target options:
* - Visual Studio 2013: supported.
* - GCC, x86-64, target not explicitly supporting AESNI:
* requires MBEDTLS_HAVE_ASM.
* - GCC, x86-32, target not explicitly supporting AESNI:
* not supported.
* - GCC, x86-64 or x86-32, target supporting AESNI: supported.
* For this assembly-less implementation, you must currently compile
* `library/aesni.c` and `library/aes.c` with machine options to enable
* SSE2 and AESNI instructions: `gcc -msse2 -maes -mpclmul` or
* `clang -maes -mpclmul`.
* - Non-x86 targets: this option is silently ignored.
* - Other compilers: this option is silently ignored.
*
* \note
* Above, "GCC" includes compatible compilers such as Clang.
* The limitations on target support are likely to be relaxed in the future.
* *
* Module: library/aesni.c * Module: library/aesni.c
* Caller: library/aes.c * Caller: library/aes.c
* *
* Requires: MBEDTLS_HAVE_ASM * Requires: MBEDTLS_HAVE_ASM (on some platforms, see note)
* *
* This modules adds support for the AES-NI instructions on x86-64 * This modules adds support for the AES-NI instructions on x86.
*/ */
#define MBEDTLS_AESNI_C #define MBEDTLS_AESNI_C