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diff --git a/core/lib/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c b/core/lib/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c
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+++ b/core/lib/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c
@@ -0,0 +1,81 @@
+/*
+ * 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
+ */
+#include "tomcrypt.h"
+
+/**
+ @file der_length_bit_string.c
+ ASN.1 DER, get length of BIT STRING, Tom St Denis
+*/
+
+#ifdef LTC_DER
+/**
+ Gets length of DER encoding of BIT STRING
+ @param nbits The number of bits in the string to encode
+ @param outlen [out] The length of the DER encoding for the given string
+ @return CRYPT_OK if successful
+*/
+int der_length_bit_string(unsigned long nbits, unsigned long *outlen)
+{
+ unsigned long nbytes;
+ LTC_ARGCHK(outlen != NULL);
+
+ /* get the number of the bytes */
+ nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1;
+
+ if (nbytes < 128) {
+ /* 03 LL PP DD DD DD ... */
+ *outlen = 2 + nbytes;
+ } else if (nbytes < 256) {
+ /* 03 81 LL PP DD DD DD ... */
+ *outlen = 3 + nbytes;
+ } else if (nbytes < 65536) {
+ /* 03 82 LL LL PP DD DD DD ... */
+ *outlen = 4 + nbytes;
+ } else {
+ return CRYPT_INVALID_ARG;
+ }
+
+ return CRYPT_OK;
+}
+
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c,v $ */
+/* $Revision: 1.3 $ */
+/* $Date: 2006/12/28 01:27:24 $ */