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samba-mirror/lib/crypto/aes.c
Stefan Metzmacher 7ae77db3b2 lib/crypto: avoid 'return void_function();' which isn't portable
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>
2018-04-03 16:41:09 +02:00

330 lines
8.2 KiB
C

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