1 files changed, 187 insertions, 0 deletions

diff --git a/src/lib/libcrypto/modes/xts128.c b/src/lib/libcrypto/modes/xts128.c
new file mode 100644
index 0000000000..9cf27a25e9
--- /dev/null
+++ b/src/lib/libcrypto/modes/xts128.c
@@ -0,0 +1,187 @@
+/* ====================================================================
+ * 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>
+
+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) {
+#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);
+#if defined(STRICT_ALIGNMENT)
+                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];
+#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];
+                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];
+#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];
+                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;
+}