aesni.h

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/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */
#ifndef MBEDTLS_AESNI_H
#define MBEDTLS_AESNI_H
 
#include "mbedtls/build_info.h"
 
#include "mbedtls/aes.h"
 
#define MBEDTLS_AESNI_AES      0x02000000u
#define MBEDTLS_AESNI_CLMUL    0x00000002u
 
#if defined(MBEDTLS_AESNI_C) && \
    (defined(MBEDTLS_ARCH_IS_X64) || defined(MBEDTLS_ARCH_IS_X86))
 
/* Can we do AESNI with intrinsics?
 * (Only implemented with certain compilers, only for certain targets.)
 */
#undef MBEDTLS_AESNI_HAVE_INTRINSICS
#if defined(_MSC_VER) && !defined(__clang__)
/* Visual Studio supports AESNI intrinsics since VS 2008 SP1. We only support
 * VS 2013 and up for other reasons anyway, so no need to check the version. */
#define MBEDTLS_AESNI_HAVE_INTRINSICS
#endif
/* GCC-like compilers: currently, we only support intrinsics if the requisite
 * target flag is enabled when building the library (e.g. `gcc -mpclmul -msse2`
 * or `clang -maes -mpclmul`). */
#if (defined(__GNUC__) || defined(__clang__)) && defined(__AES__) && defined(__PCLMUL__)
#define MBEDTLS_AESNI_HAVE_INTRINSICS
#endif
/* For 32-bit, we only support intrinsics */
#if defined(MBEDTLS_ARCH_IS_X86) && (defined(__GNUC__) || defined(__clang__))
#define MBEDTLS_AESNI_HAVE_INTRINSICS
#endif
 
/* Choose the implementation of AESNI, if one is available.
 *
 * Favor the intrinsics-based implementation if it's available, for better
 * maintainability.
 * Performance is about the same (see #7380).
 * In the long run, we will likely remove the assembly implementation. */
#if defined(MBEDTLS_AESNI_HAVE_INTRINSICS)
#define MBEDTLS_AESNI_HAVE_CODE 2 // via intrinsics
#elif defined(MBEDTLS_HAVE_ASM) && \
    (defined(__GNUC__) || defined(__clang__)) && defined(MBEDTLS_ARCH_IS_X64)
/* Can we do AESNI with inline assembly?
 * (Only implemented with gas syntax, only for 64-bit.)
 */
#define MBEDTLS_AESNI_HAVE_CODE 1 // via assembly
#else
#error "MBEDTLS_AESNI_C defined, but neither intrinsics nor assembly available"
#endif
 
#if defined(MBEDTLS_AESNI_HAVE_CODE)
 
#ifdef __cplusplus
extern "C" {
#endif
 
#if !defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
int mbedtls_aesni_has_support(unsigned int what);
#else
#define mbedtls_aesni_has_support(what) 1
#endif
 
int mbedtls_aesni_crypt_ecb(mbedtls_aes_context *ctx,
                            int mode,
                            const unsigned char input[16],
                            unsigned char output[16]);
 
void mbedtls_aesni_gcm_mult(unsigned char c[16],
                            const unsigned char a[16],
                            const unsigned char b[16]);
 
#if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
void mbedtls_aesni_inverse_key(unsigned char *invkey,
                               const unsigned char *fwdkey,
                               int nr);
#endif /* !MBEDTLS_BLOCK_CIPHER_NO_DECRYPT */
 
int mbedtls_aesni_setkey_enc(unsigned char *rk,
                             const unsigned char *key,
                             size_t bits);
 
#ifdef __cplusplus
}
#endif
 
#endif /* MBEDTLS_AESNI_HAVE_CODE */
#endif  /* MBEDTLS_AESNI_C && (MBEDTLS_ARCH_IS_X64 || MBEDTLS_ARCH_IS_X86) */
 
#endif /* MBEDTLS_AESNI_H */