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diff --git a/core/lib/libtomcrypt/src/encauth/ocb/ocb_encrypt.c b/core/lib/libtomcrypt/src/encauth/ocb/ocb_encrypt.c
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+/*
+ * Copyright (c) 2001-2007, Tom St Denis
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS 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 COPYRIGHT HOLDER OR 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.
+ */
+
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+ */
+
+/**
+ @file ocb_encrypt.c
+ OCB implementation, encrypt data, by Tom St Denis
+*/
+#include "tomcrypt.h"
+
+#ifdef LTC_OCB_MODE
+
+/**
+ Encrypt a block of data with OCB.
+ @param ocb The OCB state
+ @param pt The plaintext (length of the block size of the block cipher)
+ @param ct [out] The ciphertext (same size as the pt)
+ @return CRYPT_OK if successful
+*/
+int ocb_encrypt(ocb_state *ocb, const unsigned char *pt, unsigned char *ct)
+{
+ unsigned char Z[MAXBLOCKSIZE], tmp[MAXBLOCKSIZE];
+ int err, x;
+
+ LTC_ARGCHK(ocb != NULL);
+ LTC_ARGCHK(pt != NULL);
+ LTC_ARGCHK(ct != NULL);
+ if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
+ return err;
+ }
+ if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
+ return CRYPT_INVALID_ARG;
+ }
+
+ /* compute checksum */
+ for (x = 0; x < ocb->block_len; x++) {
+ ocb->checksum[x] ^= pt[x];
+ }
+
+ /* Get Z[i] value */
+ ocb_shift_xor(ocb, Z);
+
+ /* xor pt in, encrypt, xor Z out */
+ for (x = 0; x < ocb->block_len; x++) {
+ tmp[x] = pt[x] ^ Z[x];
+ }
+ if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, ct, &ocb->key)) != CRYPT_OK) {
+ return err;
+ }
+ for (x = 0; x < ocb->block_len; x++) {
+ ct[x] ^= Z[x];
+ }
+
+#ifdef LTC_CLEAN_STACK
+ zeromem(Z, sizeof(Z));
+ zeromem(tmp, sizeof(tmp));
+#endif
+ return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/encauth/ocb/ocb_encrypt.c,v $ */
+/* $Revision: 1.7 $ */
+/* $Date: 2007/05/12 14:32:35 $ */