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/* $OpenBSD: xts128.c,v 1.6 2015/02/10 09:46:30 miod Exp $ */ |
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/* ==================================================================== |
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* Copyright (c) 2011 The OpenSSL Project. 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 |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* openssl-core@openssl.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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*/ |
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#include <machine/endian.h> |
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#include <openssl/crypto.h> |
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#include "modes_lcl.h" |
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#include <string.h> |
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#ifndef MODES_DEBUG |
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# ifndef NDEBUG |
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# define NDEBUG |
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# endif |
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#endif |
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int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16], |
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const unsigned char *inp, unsigned char *out, |
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size_t len, int enc) |
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{ |
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union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch; |
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unsigned int i; |
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if (len<16) return -1; |
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memcpy(tweak.c, iv, 16); |
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(*ctx->block2)(tweak.c,tweak.c,ctx->key2); |
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if (!enc && (len%16)) len-=16; |
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while (len>=16) { |
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#ifdef __STRICT_ALIGNMENT |
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memcpy(scratch.c,inp,16); |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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#else |
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scratch.u[0] = ((u64*)inp)[0]^tweak.u[0]; |
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scratch.u[1] = ((u64*)inp)[1]^tweak.u[1]; |
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#endif |
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1); |
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#ifdef __STRICT_ALIGNMENT |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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memcpy(out,scratch.c,16); |
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#else |
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((u64*)out)[0] = scratch.u[0]^=tweak.u[0]; |
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((u64*)out)[1] = scratch.u[1]^=tweak.u[1]; |
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#endif |
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inp += 16; |
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out += 16; |
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len -= 16; |
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if (len==0) return 0; |
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if (BYTE_ORDER == LITTLE_ENDIAN) { |
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unsigned int carry,res; |
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res = 0x87&(((int)tweak.d[3])>>31); |
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carry = (unsigned int)(tweak.u[0]>>63); |
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tweak.u[0] = (tweak.u[0]<<1)^res; |
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tweak.u[1] = (tweak.u[1]<<1)|carry; |
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} |
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else { |
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size_t c; |
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for (c=0,i=0;i<16;++i) { |
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/*+ substitutes for |, because c is 1 bit */ |
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c += ((size_t)tweak.c[i])<<1; |
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tweak.c[i] = (u8)c; |
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c = c>>8; |
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} |
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tweak.c[0] ^= (u8)(0x87&(0-c)); |
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} |
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} |
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if (enc) { |
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for (i=0;i<len;++i) { |
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u8 c = inp[i]; |
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out[i] = scratch.c[i]; |
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scratch.c[i] = c; |
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} |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1); |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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memcpy(out-16,scratch.c,16); |
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} |
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else { |
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union { u64 u[2]; u8 c[16]; } tweak1; |
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if (BYTE_ORDER == LITTLE_ENDIAN) { |
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unsigned int carry,res; |
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res = 0x87&(((int)tweak.d[3])>>31); |
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carry = (unsigned int)(tweak.u[0]>>63); |
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tweak1.u[0] = (tweak.u[0]<<1)^res; |
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tweak1.u[1] = (tweak.u[1]<<1)|carry; |
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} |
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else { |
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size_t c; |
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for (c=0,i=0;i<16;++i) { |
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/*+ substitutes for |, because c is 1 bit */ |
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c += ((size_t)tweak.c[i])<<1; |
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tweak1.c[i] = (u8)c; |
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c = c>>8; |
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} |
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tweak1.c[0] ^= (u8)(0x87&(0-c)); |
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} |
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#ifdef __STRICT_ALIGNMENT |
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memcpy(scratch.c,inp,16); |
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scratch.u[0] ^= tweak1.u[0]; |
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scratch.u[1] ^= tweak1.u[1]; |
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#else |
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scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0]; |
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scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1]; |
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#endif |
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1); |
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scratch.u[0] ^= tweak1.u[0]; |
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scratch.u[1] ^= tweak1.u[1]; |
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for (i=0;i<len;++i) { |
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u8 c = inp[16+i]; |
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out[16+i] = scratch.c[i]; |
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scratch.c[i] = c; |
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} |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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(*ctx->block1)(scratch.c,scratch.c,ctx->key1); |
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#ifdef __STRICT_ALIGNMENT |
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scratch.u[0] ^= tweak.u[0]; |
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scratch.u[1] ^= tweak.u[1]; |
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memcpy (out,scratch.c,16); |
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#else |
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((u64*)out)[0] = scratch.u[0]^tweak.u[0]; |
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((u64*)out)[1] = scratch.u[1]^tweak.u[1]; |
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#endif |
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} |
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return 0; |
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} |