| /* ==================================================================== |
| * 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 <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <assert.h> |
| #include <string.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| |
| #ifndef MODES_DEBUG |
| # ifndef NDEBUG |
| # define NDEBUG |
| # endif |
| #endif |
| |
| int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, |
| const unsigned char iv[16], |
| 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; |
| unsigned int i; |
| |
| if (len < 16) |
| return -1; |
| |
| OPENSSL_port_memcpy(tweak.c, iv, 16); |
| |
| (*ctx->block2) (tweak.c, tweak.c, ctx->key2); |
| |
| if (!enc && (len % 16)) |
| len -= 16; |
| |
| while (len >= 16) { |
| #if defined(STRICT_ALIGNMENT) |
| OPENSSL_port_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); |
| #if defined(STRICT_ALIGNMENT) |
| scratch.u[0] ^= tweak.u[0]; |
| scratch.u[1] ^= tweak.u[1]; |
| OPENSSL_port_memcpy(out, scratch.c, 16); |
| #else |
| ((u64 *)out)[0] = scratch.u[0] ^= tweak.u[0]; |
| ((u64 *)out)[1] = scratch.u[1] ^= tweak.u[1]; |
| #endif |
| inp += 16; |
| out += 16; |
| len -= 16; |
| |
| if (len == 0) |
| return 0; |
| |
| if (is_endian.little) { |
| unsigned int carry, res; |
| |
| res = 0x87 & (((int)tweak.d[3]) >> 31); |
| carry = (unsigned int)(tweak.u[0] >> 63); |
| tweak.u[0] = (tweak.u[0] << 1) ^ res; |
| tweak.u[1] = (tweak.u[1] << 1) | carry; |
| } else { |
| size_t c; |
| |
| for (c = 0, i = 0; i < 16; ++i) { |
| /* |
| * + substitutes for |, because c is 1 bit |
| */ |
| c += ((size_t)tweak.c[i]) << 1; |
| tweak.c[i] = (u8)c; |
| c = c >> 8; |
| } |
| tweak.c[0] ^= (u8)(0x87 & (0 - c)); |
| } |
| } |
| 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]; |
| OPENSSL_port_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 = (unsigned int)(tweak.u[0] >> 63); |
| tweak1.u[0] = (tweak.u[0] << 1) ^ res; |
| tweak1.u[1] = (tweak.u[1] << 1) | carry; |
| } else { |
| size_t c; |
| |
| for (c = 0, i = 0; i < 16; ++i) { |
| /* |
| * + substitutes for |, because c is 1 bit |
| */ |
| c += ((size_t)tweak.c[i]) << 1; |
| tweak1.c[i] = (u8)c; |
| c = c >> 8; |
| } |
| tweak1.c[0] ^= (u8)(0x87 & (0 - c)); |
| } |
| #if defined(STRICT_ALIGNMENT) |
| OPENSSL_port_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); |
| #if defined(STRICT_ALIGNMENT) |
| scratch.u[0] ^= tweak.u[0]; |
| scratch.u[1] ^= tweak.u[1]; |
| OPENSSL_port_memcpy(out, scratch.c, 16); |
| #else |
| ((u64 *)out)[0] = scratch.u[0] ^ tweak.u[0]; |
| ((u64 *)out)[1] = scratch.u[1] ^ tweak.u[1]; |
| #endif |
| } |
| |
| return 0; |
| } |
