162 lines
5.5 KiB
C
162 lines
5.5 KiB
C
/**
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* \file aesni.h
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*
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* \brief AES-NI for hardware AES acceleration on some Intel processors
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*
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* \warning These functions are only for internal use by other library
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* functions; you must not call them directly.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#ifndef MBEDTLS_AESNI_H
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#define MBEDTLS_AESNI_H
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#include "mbedtls/build_info.h"
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#include "mbedtls/aes.h"
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#define MBEDTLS_AESNI_AES 0x02000000u
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#define MBEDTLS_AESNI_CLMUL 0x00000002u
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#if defined(MBEDTLS_AESNI_C) && \
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(defined(MBEDTLS_ARCH_IS_X64) || defined(MBEDTLS_ARCH_IS_X86))
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/* Can we do AESNI with intrinsics?
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* (Only implemented with certain compilers, only for certain targets.)
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*/
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#undef MBEDTLS_AESNI_HAVE_INTRINSICS
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#if defined(_MSC_VER) && !defined(__clang__)
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/* Visual Studio supports AESNI intrinsics since VS 2008 SP1. We only support
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* VS 2013 and up for other reasons anyway, so no need to check the version. */
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#define MBEDTLS_AESNI_HAVE_INTRINSICS
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#endif
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/* GCC-like compilers: currently, we only support intrinsics if the requisite
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* target flag is enabled when building the library (e.g. `gcc -mpclmul -msse2`
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* or `clang -maes -mpclmul`). */
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#if (defined(__GNUC__) || defined(__clang__)) && defined(__AES__) && defined(__PCLMUL__)
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#define MBEDTLS_AESNI_HAVE_INTRINSICS
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#endif
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/* For 32-bit, we only support intrinsics */
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#if defined(MBEDTLS_ARCH_IS_X86) && (defined(__GNUC__) || defined(__clang__))
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#define MBEDTLS_AESNI_HAVE_INTRINSICS
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#endif
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/* Choose the implementation of AESNI, if one is available.
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*
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* Favor the intrinsics-based implementation if it's available, for better
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* maintainability.
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* Performance is about the same (see #7380).
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* In the long run, we will likely remove the assembly implementation. */
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#if defined(MBEDTLS_AESNI_HAVE_INTRINSICS)
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#define MBEDTLS_AESNI_HAVE_CODE 2 // via intrinsics
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#elif defined(MBEDTLS_HAVE_ASM) && \
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(defined(__GNUC__) || defined(__clang__)) && defined(MBEDTLS_ARCH_IS_X64)
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/* Can we do AESNI with inline assembly?
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* (Only implemented with gas syntax, only for 64-bit.)
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*/
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#define MBEDTLS_AESNI_HAVE_CODE 1 // via assembly
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#else
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#error "MBEDTLS_AESNI_C defined, but neither intrinsics nor assembly available"
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#endif
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#if defined(MBEDTLS_AESNI_HAVE_CODE)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Internal function to detect the AES-NI feature in CPUs.
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*
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* \note This function is only for internal use by other library
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* functions; you must not call it directly.
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*
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* \param what The feature to detect
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* (MBEDTLS_AESNI_AES or MBEDTLS_AESNI_CLMUL)
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*
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* \return 1 if CPU has support for the feature, 0 otherwise
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*/
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#if !defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
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int mbedtls_aesni_has_support(unsigned int what);
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#else
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#define mbedtls_aesni_has_support(what) 1
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#endif
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/**
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* \brief Internal AES-NI AES-ECB block encryption and decryption
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*
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* \note This function is only for internal use by other library
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* functions; you must not call it directly.
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*
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* \param ctx AES context
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* \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
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* \param input 16-byte input block
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* \param output 16-byte output block
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*
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* \return 0 on success (cannot fail)
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*/
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int mbedtls_aesni_crypt_ecb(mbedtls_aes_context *ctx,
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int mode,
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const unsigned char input[16],
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unsigned char output[16]);
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/**
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* \brief Internal GCM multiplication: c = a * b in GF(2^128)
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*
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* \note This function is only for internal use by other library
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* functions; you must not call it directly.
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*
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* \param c Result
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* \param a First operand
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* \param b Second operand
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*
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* \note Both operands and result are bit strings interpreted as
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* elements of GF(2^128) as per the GCM spec.
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*/
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void mbedtls_aesni_gcm_mult(unsigned char c[16],
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const unsigned char a[16],
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const unsigned char b[16]);
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#if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
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/**
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* \brief Internal round key inversion. This function computes
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* decryption round keys from the encryption round keys.
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*
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* \note This function is only for internal use by other library
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* functions; you must not call it directly.
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*
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* \param invkey Round keys for the equivalent inverse cipher
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* \param fwdkey Original round keys (for encryption)
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* \param nr Number of rounds (that is, number of round keys minus one)
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*/
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void mbedtls_aesni_inverse_key(unsigned char *invkey,
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const unsigned char *fwdkey,
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int nr);
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#endif /* !MBEDTLS_BLOCK_CIPHER_NO_DECRYPT */
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/**
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* \brief Internal key expansion for encryption
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*
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* \note This function is only for internal use by other library
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* functions; you must not call it directly.
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*
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* \param rk Destination buffer where the round keys are written
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* \param key Encryption key
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* \param bits Key size in bits (must be 128, 192 or 256)
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*
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* \return 0 if successful, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH
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*/
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int mbedtls_aesni_setkey_enc(unsigned char *rk,
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const unsigned char *key,
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size_t bits);
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#ifdef __cplusplus
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}
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#endif
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#endif /* MBEDTLS_AESNI_HAVE_CODE */
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#endif /* MBEDTLS_AESNI_C && (MBEDTLS_ARCH_IS_X64 || MBEDTLS_ARCH_IS_X86) */
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#endif /* MBEDTLS_AESNI_H */
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