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7ae77db3b2
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13343 Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Björn Jacke <bjacke@samba.org>
330 lines
8.2 KiB
C
330 lines
8.2 KiB
C
/*
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* Copyright (c) 2003 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "replace.h"
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#include "aes.h"
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#ifdef SAMBA_RIJNDAEL
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#include "rijndael-alg-fst.h"
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#if defined(HAVE_AESNI_INTEL)
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/*
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* NB. HAVE_AESNI_INTEL is only defined if -lang-asm is
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* available.
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*/
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static inline void __cpuid(unsigned int where[4], unsigned int leaf)
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{
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asm volatile("cpuid" :
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"=a" (where[0]),
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"=b" (where[1]),
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"=c" (where[2]),
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"=d" (where[3]): "a" (leaf));
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}
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/*
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* has_intel_aes_instructions()
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* return true if supports AES-NI and false if doesn't
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*/
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static bool has_intel_aes_instructions(void)
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{
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static int has_aes_instructions = -1;
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unsigned int cpuid_results[4];
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if (has_aes_instructions != -1) {
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return (bool)has_aes_instructions;
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}
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__cpuid(cpuid_results, 1);
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has_aes_instructions = !!(cpuid_results[2] & (1 << 25));
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return (bool)has_aes_instructions;
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}
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/*
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* Macro to ensure the AES key schedule starts on a 16 byte boundary.
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*/
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#define SET_ACC_CTX(k) \
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do { \
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(k)->u.aes_ni.acc_ctx = \
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(struct crypto_aes_ctx *)(((unsigned long)(k)->u.aes_ni._acc_ctx + 15) & ~0xfUL); \
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} while (0)
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/*
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* The next 4 functions call the Intel AES hardware implementations
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* of:
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*
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* AES_set_encrypt_key()
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* AES_set_decrypt_key()
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* AES_encrypt()
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* AES_decrypt()
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*/
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static int AES_set_encrypt_key_aesni(const unsigned char *userkey,
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const int bits,
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AES_KEY *key)
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{
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SET_ACC_CTX(key);
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return aesni_set_key(key->u.aes_ni.acc_ctx, userkey, bits/8);
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}
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static int AES_set_decrypt_key_aesni(const unsigned char *userkey,
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const int bits,
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AES_KEY *key)
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{
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SET_ACC_CTX(key);
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return aesni_set_key(key->u.aes_ni.acc_ctx, userkey, bits/8);
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}
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static void AES_encrypt_aesni(const unsigned char *in,
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unsigned char *out,
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const AES_KEY *key)
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{
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aesni_enc(key->u.aes_ni.acc_ctx, out, in);
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}
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static void AES_decrypt_aesni(const unsigned char *in,
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unsigned char *out,
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const AES_KEY *key)
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{
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aesni_dec(key->u.aes_ni.acc_ctx, out, in);
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}
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#else /* defined(HAVE_AESNI_INTEL) */
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/*
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* Dummy implementations if no Intel AES instructions present.
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* Only has_intel_aes_instructions() will ever be called.
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*/
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static bool has_intel_aes_instructions(void)
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{
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return false;
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}
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static int AES_set_encrypt_key_aesni(const unsigned char *userkey,
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const int bits,
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AES_KEY *key)
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{
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return -1;
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}
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static int AES_set_decrypt_key_aesni(const unsigned char *userkey,
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const int bits,
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AES_KEY *key)
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{
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return -1;
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}
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static void AES_encrypt_aesni(const unsigned char *in,
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unsigned char *out,
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const AES_KEY *key)
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{
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abort();
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}
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static void AES_decrypt_aesni(const unsigned char *in,
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unsigned char *out,
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const AES_KEY *key)
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{
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abort();
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}
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#endif /* defined(HAVE_AENI_INTEL) */
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/*
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* The next 4 functions are the pure software implementations
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* of:
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*
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* AES_set_encrypt_key()
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* AES_set_decrypt_key()
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* AES_encrypt()
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* AES_decrypt()
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*/
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static int
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AES_set_encrypt_key_rj(const unsigned char *userkey, const int bits, AES_KEY *key)
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{
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key->u.aes_rj.rounds = rijndaelKeySetupEnc(key->u.aes_rj.key, userkey, bits);
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if (key->u.aes_rj.rounds == 0)
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return -1;
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return 0;
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}
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static int
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AES_set_decrypt_key_rj(const unsigned char *userkey, const int bits, AES_KEY *key)
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{
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key->u.aes_rj.rounds = rijndaelKeySetupDec(key->u.aes_rj.key, userkey, bits);
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if (key->u.aes_rj.rounds == 0)
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return -1;
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return 0;
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}
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static void
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AES_encrypt_rj(const unsigned char *in, unsigned char *out, const AES_KEY *key)
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{
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rijndaelEncrypt(key->u.aes_rj.key, key->u.aes_rj.rounds, in, out);
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}
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static void
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AES_decrypt_rj(const unsigned char *in, unsigned char *out, const AES_KEY *key)
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{
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rijndaelDecrypt(key->u.aes_rj.key, key->u.aes_rj.rounds, in, out);
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}
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/*
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* The next 4 functions are the runtime switch for Intel AES hardware
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* implementations of:
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*
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* AES_set_encrypt_key()
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* AES_set_decrypt_key()
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* AES_encrypt()
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* AES_decrypt()
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*
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* If the hardware instructions don't exist, fall back to the software
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* versions.
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*/
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int
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AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
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{
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if (has_intel_aes_instructions()) {
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return AES_set_encrypt_key_aesni(userkey, bits, key);
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}
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return AES_set_encrypt_key_rj(userkey, bits, key);
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}
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int
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AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
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{
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if (has_intel_aes_instructions()) {
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return AES_set_decrypt_key_aesni(userkey, bits, key);
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}
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return AES_set_decrypt_key_rj(userkey, bits, key);
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}
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void
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AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
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{
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if (has_intel_aes_instructions()) {
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AES_encrypt_aesni(in, out, key);
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return;
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}
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AES_encrypt_rj(in, out, key);
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}
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void
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AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
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{
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if (has_intel_aes_instructions()) {
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AES_decrypt_aesni(in, out, key);
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return;
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}
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AES_decrypt_rj(in, out, key);
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}
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#endif /* SAMBA_RIJNDAEL */
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#ifdef SAMBA_AES_CBC_ENCRYPT
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void
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AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
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unsigned long size, const AES_KEY *key,
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unsigned char *iv, int forward_encrypt)
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{
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unsigned char tmp[AES_BLOCK_SIZE];
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int i;
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if (forward_encrypt) {
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while (size >= AES_BLOCK_SIZE) {
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for (i = 0; i < AES_BLOCK_SIZE; i++)
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tmp[i] = in[i] ^ iv[i];
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AES_encrypt(tmp, out, key);
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memcpy(iv, out, AES_BLOCK_SIZE);
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size -= AES_BLOCK_SIZE;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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if (size) {
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for (i = 0; i < size; i++)
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tmp[i] = in[i] ^ iv[i];
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for (i = size; i < AES_BLOCK_SIZE; i++)
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tmp[i] = iv[i];
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AES_encrypt(tmp, out, key);
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memcpy(iv, out, AES_BLOCK_SIZE);
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}
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} else {
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while (size >= AES_BLOCK_SIZE) {
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memcpy(tmp, in, AES_BLOCK_SIZE);
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AES_decrypt(tmp, out, key);
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for (i = 0; i < AES_BLOCK_SIZE; i++)
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out[i] ^= iv[i];
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memcpy(iv, tmp, AES_BLOCK_SIZE);
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size -= AES_BLOCK_SIZE;
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in += AES_BLOCK_SIZE;
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out += AES_BLOCK_SIZE;
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}
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if (size) {
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memcpy(tmp, in, AES_BLOCK_SIZE);
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AES_decrypt(tmp, out, key);
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for (i = 0; i < size; i++)
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out[i] ^= iv[i];
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memcpy(iv, tmp, AES_BLOCK_SIZE);
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}
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}
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}
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#endif /* SAMBA_AES_CBC_ENCRYPT */
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#ifdef SAMBA_AES_CFB8_ENCRYPT
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void
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AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
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unsigned long size, const AES_KEY *key,
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unsigned char *iv, int forward_encrypt)
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{
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int i;
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for (i = 0; i < size; i++) {
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unsigned char tmp[AES_BLOCK_SIZE + 1];
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memcpy(tmp, iv, AES_BLOCK_SIZE);
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AES_encrypt(iv, iv, key);
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if (!forward_encrypt) {
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tmp[AES_BLOCK_SIZE] = in[i];
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}
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out[i] = in[i] ^ iv[0];
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if (forward_encrypt) {
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tmp[AES_BLOCK_SIZE] = out[i];
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}
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memcpy(iv, &tmp[1], AES_BLOCK_SIZE);
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}
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}
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#endif /* SAMBA_AES_CFB8_ENCRYPT */
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