mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
xts128.c: initial draft.
This commit is contained in:
Andy Polyakov
parent
a4113c52b2
commit
01be5db64e
189
crypto/modes/xts128.c
Normal file
189
crypto/modes/xts128.c
Normal file
@ -0,0 +1,189 @@
|
|||||||
|
/* ====================================================================
|
||||||
|
* Copyright (c) 2011 The OpenSSL Project. 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. All advertising materials mentioning features or use of this
|
||||||
|
* software must display the following acknowledgment:
|
||||||
|
* "This product includes software developed by the OpenSSL Project
|
||||||
|
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
|
||||||
|
*
|
||||||
|
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
|
||||||
|
* endorse or promote products derived from this software without
|
||||||
|
* prior written permission. For written permission, please contact
|
||||||
|
* openssl-core@openssl.org.
|
||||||
|
*
|
||||||
|
* 5. Products derived from this software may not be called "OpenSSL"
|
||||||
|
* nor may "OpenSSL" appear in their names without prior written
|
||||||
|
* permission of the OpenSSL Project.
|
||||||
|
*
|
||||||
|
* 6. Redistributions of any form whatsoever must retain the following
|
||||||
|
* acknowledgment:
|
||||||
|
* "This product includes software developed by the OpenSSL Project
|
||||||
|
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
|
||||||
|
* EXPRESSED 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 OpenSSL PROJECT OR
|
||||||
|
* ITS 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 <openssl/crypto.h>
|
||||||
|
#include "modes_lcl.h"
|
||||||
|
#include <string.h>
|
||||||
|
|
||||||
|
#ifndef MODES_DEBUG
|
||||||
|
# ifndef NDEBUG
|
||||||
|
# define NDEBUG
|
||||||
|
# endif
|
||||||
|
#endif
|
||||||
|
#include <assert.h>
|
||||||
|
|
||||||
|
typedef struct {
|
||||||
|
void *key1, *key2;
|
||||||
|
block128_f block1,block2;
|
||||||
|
} XTS128_CONTEXT;
|
||||||
|
|
||||||
|
int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, u64 secno,
|
||||||
|
const unsigned char *inp, unsigned char *out,
|
||||||
|
size_t len, int enc)
|
||||||
|
{
|
||||||
|
const union { long one; char little; } is_endian = {1};
|
||||||
|
union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;
|
||||||
|
|
||||||
|
if (len<16) return -1;
|
||||||
|
|
||||||
|
if (is_endian.little) {
|
||||||
|
tweak.u[0] = secno;
|
||||||
|
tweak.u[1] = 0;
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
PUTU32(tweak.c,secno);
|
||||||
|
PUTU32(tweak.c+4,secno>>32);
|
||||||
|
tweak.u[1] = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
(*ctx->block2)(tweak.c,tweak.c,ctx->key2);
|
||||||
|
|
||||||
|
if (!enc && len%16) len-=16;
|
||||||
|
|
||||||
|
while (len>=16) {
|
||||||
|
#if defined(STRICT_ALIGNMENT)
|
||||||
|
memcpy(scratch.c,inp,16);
|
||||||
|
scratch.u[0] ^= tweak.u[0];
|
||||||
|
scratch.u[1] ^= tweak.u[1];
|
||||||
|
#else
|
||||||
|
scratch.u[0] = ((u64*)inp)[0]^tweak.u[0];
|
||||||
|
scratch.u[1] = ((u64*)inp)[1]^tweak.u[1];
|
||||||
|
#endif
|
||||||
|
(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
|
||||||
|
scratch.u[0] ^= tweak.u[0];
|
||||||
|
scratch.u[1] ^= tweak.u[1];
|
||||||
|
memcpy(out,scratch.c,16);
|
||||||
|
inp += 16;
|
||||||
|
out += 16;
|
||||||
|
len -= 16;
|
||||||
|
|
||||||
|
if (is_endian.little) {
|
||||||
|
unsigned int carry,res;
|
||||||
|
|
||||||
|
res = 0x87&(((int)tweak.d[3])>>31);
|
||||||
|
carry = tweak.u[0]>>63;
|
||||||
|
tweak.u[0] = (tweak.u[0]<<1)^res;
|
||||||
|
tweak.u[1] = (tweak.u[1]<<1)|carry;
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
unsigned int carry,c,i;
|
||||||
|
|
||||||
|
for (carry=0,i=0;i<16;++i) {
|
||||||
|
c = tweak.c[i];
|
||||||
|
tweak.c[i] = (c<<1)|carry;
|
||||||
|
carry = c>>7;
|
||||||
|
}
|
||||||
|
tweak.c[0] ^= 0x87&(0-carry);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if (len) {
|
||||||
|
unsigned int i;
|
||||||
|
|
||||||
|
if (enc) {
|
||||||
|
for (i=0;i<len;++i) {
|
||||||
|
u8 c = inp[i];
|
||||||
|
out[i] = scratch.c[i];
|
||||||
|
scratch.c[i] = c;
|
||||||
|
}
|
||||||
|
scratch.u[0] ^= tweak.u[0];
|
||||||
|
scratch.u[1] ^= tweak.u[1];
|
||||||
|
(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
|
||||||
|
scratch.u[0] ^= tweak.u[0];
|
||||||
|
scratch.u[1] ^= tweak.u[1];
|
||||||
|
memcpy(out-16,scratch.c,16);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
union { u64 u[2]; u8 c[16]; } tweak1;
|
||||||
|
|
||||||
|
if (is_endian.little) {
|
||||||
|
unsigned int carry,res;
|
||||||
|
|
||||||
|
res = 0x87&(((int)tweak.d[3])>>31);
|
||||||
|
carry = tweak.u[0]>>63;
|
||||||
|
tweak1.u[0] = (tweak.u[0]<<1)^res;
|
||||||
|
tweak1.u[1] = (tweak.u[1]<<1)|carry;
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
unsigned int carry,c;
|
||||||
|
|
||||||
|
for (carry=0,i=0;i<16;++i) {
|
||||||
|
c = tweak.c[i];
|
||||||
|
tweak1.c[i] = (c<<1)|carry;
|
||||||
|
carry = c>>7;
|
||||||
|
}
|
||||||
|
tweak1.c[0] ^= 0x87&(0-carry);
|
||||||
|
}
|
||||||
|
#if defined(STRICT_ALIGNMENT)
|
||||||
|
memcpy(scratch.c,inp,16);
|
||||||
|
scratch.u[0] ^= tweak1.u[0];
|
||||||
|
scratch.u[1] ^= tweak1.u[1];
|
||||||
|
#else
|
||||||
|
scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0];
|
||||||
|
scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1];
|
||||||
|
#endif
|
||||||
|
(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
|
||||||
|
scratch.u[0] ^= tweak1.u[0];
|
||||||
|
scratch.u[1] ^= tweak1.u[1];
|
||||||
|
|
||||||
|
for (i=0;i<len;++i) {
|
||||||
|
u8 c = inp[16+i];
|
||||||
|
out[16+i] = scratch.c[i];
|
||||||
|
scratch.c[i] = c;
|
||||||
|
}
|
||||||
|
scratch.u[0] ^= tweak.u[0];
|
||||||
|
scratch.u[1] ^= tweak.u[1];
|
||||||
|
(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
|
||||||
|
scratch.u[0] ^= tweak.u[0];
|
||||||
|
scratch.u[1] ^= tweak.u[1];
|
||||||
|
memcpy (out,scratch.c,16);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user