1 /** 2 * \file aesni.h 3 * 4 * \brief AES-NI for hardware AES acceleration on some Intel processors 5 * 6 * \warning These functions are only for internal use by other library 7 * functions; you must not call them directly. 8 */ 9 /* 10 * Copyright The Mbed TLS Contributors 11 * SPDX-License-Identifier: Apache-2.0 12 * 13 * Licensed under the Apache License, Version 2.0 (the "License"); you may 14 * not use this file except in compliance with the License. 15 * You may obtain a copy of the License at 16 * 17 * http://www.apache.org/licenses/LICENSE-2.0 18 * 19 * Unless required by applicable law or agreed to in writing, software 20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 22 * See the License for the specific language governing permissions and 23 * limitations under the License. 24 */ 25 #ifndef MBEDTLS_AESNI_H 26 #define MBEDTLS_AESNI_H 27 28 #include "mbedtls/build_info.h" 29 30 #include "mbedtls/aes.h" 31 32 #define MBEDTLS_AESNI_AES 0x02000000u 33 #define MBEDTLS_AESNI_CLMUL 0x00000002u 34 35 #if defined(MBEDTLS_HAVE_ASM) && defined(__GNUC__) && \ 36 ( defined(__amd64__) || defined(__x86_64__) ) && \ 37 ! defined(MBEDTLS_HAVE_X86_64) 38 #define MBEDTLS_HAVE_X86_64 39 #endif 40 41 #if defined(MBEDTLS_HAVE_X86_64) 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /** 48 * \brief Internal function to detect the AES-NI feature in CPUs. 49 * 50 * \note This function is only for internal use by other library 51 * functions; you must not call it directly. 52 * 53 * \param what The feature to detect 54 * (MBEDTLS_AESNI_AES or MBEDTLS_AESNI_CLMUL) 55 * 56 * \return 1 if CPU has support for the feature, 0 otherwise 57 */ 58 int mbedtls_aesni_has_support( unsigned int what ); 59 60 /** 61 * \brief Internal AES-NI AES-ECB block encryption and decryption 62 * 63 * \note This function is only for internal use by other library 64 * functions; you must not call it directly. 65 * 66 * \param ctx AES context 67 * \param mode MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT 68 * \param input 16-byte input block 69 * \param output 16-byte output block 70 * 71 * \return 0 on success (cannot fail) 72 */ 73 int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx, 74 int mode, 75 const unsigned char input[16], 76 unsigned char output[16] ); 77 78 /** 79 * \brief Internal GCM multiplication: c = a * b in GF(2^128) 80 * 81 * \note This function is only for internal use by other library 82 * functions; you must not call it directly. 83 * 84 * \param c Result 85 * \param a First operand 86 * \param b Second operand 87 * 88 * \note Both operands and result are bit strings interpreted as 89 * elements of GF(2^128) as per the GCM spec. 90 */ 91 void mbedtls_aesni_gcm_mult( unsigned char c[16], 92 const unsigned char a[16], 93 const unsigned char b[16] ); 94 95 /** 96 * \brief Internal round key inversion. This function computes 97 * decryption round keys from the encryption round keys. 98 * 99 * \note This function is only for internal use by other library 100 * functions; you must not call it directly. 101 * 102 * \param invkey Round keys for the equivalent inverse cipher 103 * \param fwdkey Original round keys (for encryption) 104 * \param nr Number of rounds (that is, number of round keys minus one) 105 */ 106 void mbedtls_aesni_inverse_key( unsigned char *invkey, 107 const unsigned char *fwdkey, 108 int nr ); 109 110 /** 111 * \brief Internal key expansion for encryption 112 * 113 * \note This function is only for internal use by other library 114 * functions; you must not call it directly. 115 * 116 * \param rk Destination buffer where the round keys are written 117 * \param key Encryption key 118 * \param bits Key size in bits (must be 128, 192 or 256) 119 * 120 * \return 0 if successful, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH 121 */ 122 int mbedtls_aesni_setkey_enc( unsigned char *rk, 123 const unsigned char *key, 124 size_t bits ); 125 126 #ifdef __cplusplus 127 } 128 #endif 129 130 #endif /* MBEDTLS_HAVE_X86_64 */ 131 132 #endif /* MBEDTLS_AESNI_H */ 133