aesni.h

00001 /**
00002  * \file aesni.h
00003  *
00004  * \brief AES-NI for hardware AES acceleration on some Intel processors
00005  *
00006  *  Copyright (C) 2013, ARM Limited, All Rights Reserved
00007  *
00008  *  This file is part of mbed TLS (https://tls.mbed.org)
00009  *
00010  *  This program is free software; you can redistribute it and/or modify
00011  *  it under the terms of the GNU General Public License as published by
00012  *  the Free Software Foundation; either version 2 of the License, or
00013  *  (at your option) any later version.
00014  *
00015  *  This program is distributed in the hope that it will be useful,
00016  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00017  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00018  *  GNU General Public License for more details.
00019  *
00020  *  You should have received a copy of the GNU General Public License along
00021  *  with this program; if not, write to the Free Software Foundation, Inc.,
00022  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00023  */
00024 #ifndef POLARSSL_AESNI_H
00025 #define POLARSSL_AESNI_H
00026 
00027 #include "aes.h"
00028 
00029 #define POLARSSL_AESNI_AES      0x02000000u
00030 #define POLARSSL_AESNI_CLMUL    0x00000002u
00031 
00032 #if defined(POLARSSL_HAVE_ASM) && defined(__GNUC__) &&  \
00033     ( defined(__amd64__) || defined(__x86_64__) )   &&  \
00034     ! defined(POLARSSL_HAVE_X86_64)
00035 #define POLARSSL_HAVE_X86_64
00036 #endif
00037 
00038 #if defined(POLARSSL_HAVE_X86_64)
00039 
00040 #ifdef __cplusplus
00041 extern "C" {
00042 #endif
00043 
00044 /**
00045  * \brief          AES-NI features detection routine
00046  *
00047  * \param what     The feature to detect
00048  *                 (POLARSSL_AESNI_AES or POLARSSL_AESNI_CLMUL)
00049  *
00050  * \return         1 if CPU has support for the feature, 0 otherwise
00051  */
00052 int aesni_supports( unsigned int what );
00053 
00054 /**
00055  * \brief          AES-NI AES-ECB block en(de)cryption
00056  *
00057  * \param ctx      AES context
00058  * \param mode     AES_ENCRYPT or AES_DECRYPT
00059  * \param input    16-byte input block
00060  * \param output   16-byte output block
00061  *
00062  * \return         0 on success (cannot fail)
00063  */
00064 int aesni_crypt_ecb( aes_context *ctx,
00065                      int mode,
00066                      const unsigned char input[16],
00067                      unsigned char output[16] );
00068 
00069 /**
00070  * \brief          GCM multiplication: c = a * b in GF(2^128)
00071  *
00072  * \param c        Result
00073  * \param a        First operand
00074  * \param b        Second operand
00075  *
00076  * \note           Both operands and result are bit strings interpreted as
00077  *                 elements of GF(2^128) as per the GCM spec.
00078  */
00079 void aesni_gcm_mult( unsigned char c[16],
00080                      const unsigned char a[16],
00081                      const unsigned char b[16] );
00082 
00083 /**
00084  * \brief           Compute decryption round keys from encryption round keys
00085  *
00086  * \param invkey    Round keys for the equivalent inverse cipher
00087  * \param fwdkey    Original round keys (for encryption)
00088  * \param nr        Number of rounds (that is, number of round keys minus one)
00089  */
00090 void aesni_inverse_key( unsigned char *invkey,
00091                         const unsigned char *fwdkey, int nr );
00092 
00093 /**
00094  * \brief           Perform key expansion (for encryption)
00095  *
00096  * \param rk        Destination buffer where the round keys are written
00097  * \param key       Encryption key
00098  * \param bits      Key size in bits (must be 128, 192 or 256)
00099  *
00100  * \return          0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
00101  */
00102 int aesni_setkey_enc( unsigned char *rk,
00103                       const unsigned char *key,
00104                       size_t bits );
00105 
00106 #ifdef __cplusplus
00107 }
00108 #endif
00109 
00110 #endif /* POLARSSL_HAVE_X86_64 */
00111 
00112 #endif /* POLARSSL_AESNI_H */
00113