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108 lines
3.4 KiB
C
108 lines
3.4 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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* Copyright (C) 2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_AESNI_H
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#define POLARSSL_AESNI_H
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#include "aes.h"
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#define POLARSSL_AESNI_AES 0x02000000u
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#define POLARSSL_AESNI_CLMUL 0x00000002u
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#if defined(POLARSSL_HAVE_ASM) && defined(__GNUC__) && \
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( defined(__amd64__) || defined(__x86_64__) ) && \
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! defined(POLARSSL_HAVE_X86_64)
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#define POLARSSL_HAVE_X86_64
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#endif
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#if defined(POLARSSL_HAVE_X86_64)
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/**
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* \brief AES-NI features detection routine
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*
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* \param what The feature to detect
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* (POLARSSL_AESNI_AES or POLARSSL_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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int aesni_supports( unsigned int what );
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/**
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* \brief AES-NI AES-ECB block en(de)cryption
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*
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* \param ctx AES context
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* \param mode AES_ENCRYPT or 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 aesni_crypt_ecb( 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 GCM multiplication: c = a * b in GF(2^128)
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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 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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/**
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* \brief Compute decryption round keys from 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 aesni_inverse_key( unsigned char *invkey,
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const unsigned char *fwdkey, int nr );
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/**
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* \brief Perform 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 POLARSSL_ERR_AES_INVALID_KEY_LENGTH
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*/
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int 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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#endif /* POLARSSL_HAVE_X86_64 */
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#endif /* POLARSSL_AESNI_H */
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