-/* ====================================================================
- * Copyright (c) 2011 The OpenSSL Project. All rights reserved.
+/*
+ * Copyright 2011-2020 The OpenSSL Project Authors. 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.
- * ====================================================================
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-#include <openssl/crypto.h>
-#include "modes_lcl.h"
#include <string.h>
+#include <openssl/crypto.h>
+#include "crypto/modes.h"
-#ifndef MODES_DEBUG
-# ifndef NDEBUG
-# define NDEBUG
+#ifndef STRICT_ALIGNMENT
+# ifdef __GNUC__
+typedef u64 u64_a1 __attribute((__aligned__(1)));
+# else
+typedef u64 u64_a1;
# endif
#endif
-#include <assert.h>
-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)
+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;
-
- memcpy(tweak.c, iv, 16);
-
- (*ctx->block2)(tweak.c,tweak.c,ctx->key2);
-
- if (!enc && (len%16)) len-=16;
-
- while (len>=16) {
+ 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;
+
+ 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)
- memcpy(scratch.c,inp,16);
- scratch.u[0] ^= tweak.u[0];
- scratch.u[1] ^= tweak.u[1];
+ 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];
+ scratch.u[0] = ((u64_a1 *)inp)[0] ^ tweak.u[0];
+ scratch.u[1] = ((u64_a1 *)inp)[1] ^ tweak.u[1];
#endif
- (*ctx->block1)(scratch.c,scratch.c,ctx->key1);
+ (*ctx->block1) (scratch.c, scratch.c, ctx->key1);
#if defined(STRICT_ALIGNMENT)
- scratch.u[0] ^= tweak.u[0];
- scratch.u[1] ^= tweak.u[1];
- memcpy(out,scratch.c,16);
+ scratch.u[0] ^= tweak.u[0];
+ scratch.u[1] ^= tweak.u[1];
+ memcpy(out, scratch.c, 16);
#else
- ((u64*)out)[0] = scratch.u[0]^tweak.u[0];
- ((u64*)out)[1] = scratch.u[1]^tweak.u[1];
+ ((u64_a1 *)out)[0] = scratch.u[0] ^= tweak.u[0];
+ ((u64_a1 *)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 = 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;
-
- 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 (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);
- }
+ 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];
+ 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)
- memcpy(scratch.c,inp,16);
- scratch.u[0] ^= tweak1.u[0];
- scratch.u[1] ^= tweak1.u[1];
+ 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];
+ scratch.u[0] = ((u64_a1 *)inp)[0] ^ tweak1.u[0];
+ scratch.u[1] = ((u64_a1 *)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);
+ (*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];
- memcpy (out,scratch.c,16);
+ scratch.u[0] ^= tweak.u[0];
+ scratch.u[1] ^= tweak.u[1];
+ memcpy(out, scratch.c, 16);
#else
- ((u64*)out)[0] = scratch.u[0]^tweak.u[0];
- ((u64*)out)[1] = scratch.u[1]^tweak.u[1];
+ ((u64_a1 *)out)[0] = scratch.u[0] ^ tweak.u[0];
+ ((u64_a1 *)out)[1] = scratch.u[1] ^ tweak.u[1];
#endif
- }
+ }
- return 0;
+ return 0;
}
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