--- /dev/null
+/* ====================================================================
+ * 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;
+}
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