137 lines
4.5 KiB
C++
137 lines
4.5 KiB
C++
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/**
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* \file aesce.h
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*
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* \brief Support hardware AES acceleration on Armv8-A processors with
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* the Armv8-A Cryptographic Extension.
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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_AESCE_H
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#define MBEDTLS_AESCE_H
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#include "mbedtls/build_info.h"
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#include "common.h"
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#include "mbedtls/aes.h"
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#if defined(MBEDTLS_AESCE_C) \
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&& defined(MBEDTLS_ARCH_IS_ARMV8_A) && defined(MBEDTLS_HAVE_NEON_INTRINSICS) \
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&& (defined(MBEDTLS_COMPILER_IS_GCC) || defined(__clang__) || defined(MSC_VER))
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/* MBEDTLS_AESCE_HAVE_CODE is defined if we have a suitable target platform, and a
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* potentially suitable compiler (compiler version & flags are not checked when defining
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* this). */
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#define MBEDTLS_AESCE_HAVE_CODE
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(__linux__) && !defined(MBEDTLS_AES_USE_HARDWARE_ONLY)
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extern signed char mbedtls_aesce_has_support_result;
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/**
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* \brief Internal function to detect the crypto extension in CPUs.
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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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int mbedtls_aesce_has_support_impl(void);
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#define MBEDTLS_AESCE_HAS_SUPPORT() (mbedtls_aesce_has_support_result == -1 ? \
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mbedtls_aesce_has_support_impl() : \
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mbedtls_aesce_has_support_result)
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#else /* defined(__linux__) && !defined(MBEDTLS_AES_USE_HARDWARE_ONLY) */
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/* If we are not on Linux, we can't detect support so assume that it's supported.
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* Similarly, assume support if MBEDTLS_AES_USE_HARDWARE_ONLY is set.
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*/
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#define MBEDTLS_AESCE_HAS_SUPPORT() 1
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#endif /* defined(__linux__) && !defined(MBEDTLS_AES_USE_HARDWARE_ONLY) */
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/**
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* \brief Internal AES-ECB block encryption and decryption
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*
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* \warning This assumes that the context specifies either 10, 12 or 14
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* rounds and will behave incorrectly if this is not the case.
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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_aesce_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_aesce_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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* \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_aesce_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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* \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_aesce_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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#else
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#if defined(MBEDTLS_AES_USE_HARDWARE_ONLY) && defined(MBEDTLS_ARCH_IS_ARMV8_A)
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#error "AES hardware acceleration not supported on this platform / compiler"
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#endif
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#endif /* MBEDTLS_AESCE_C && MBEDTLS_ARCH_IS_ARMV8_A && MBEDTLS_HAVE_NEON_INTRINSICS &&
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(MBEDTLS_COMPILER_IS_GCC || __clang__ || MSC_VER) */
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#endif /* MBEDTLS_AESCE_H */
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