--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c	Fri Mar 10 06:31:29 2006 +0000
@@ -0,0 +1,84 @@
+/* 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, [email protected], http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+  @file der_length_object_identifier.c
+  ASN.1 DER, get length of Object Identifier, Tom St Denis
+*/
+
+#ifdef LTC_DER
+
+unsigned long der_object_identifier_bits(unsigned long x)
+{
+   unsigned long c;
+   x &= 0xFFFFFFFF;
+   c  = 0;
+   while (x) {
+     ++c;
+     x >>= 1;
+   }
+   return c;
+}
+
+
+/**
+  Gets length of DER encoding of Object Identifier
+  @param nwords   The number of OID words 
+  @param words    The actual OID words to get the size of
+  @param outlen   [out] The length of the DER encoding for the given string
+  @return CRYPT_OK if successful
+*/
+int der_length_object_identifier(unsigned long *words, unsigned long nwords, unsigned long *outlen)
+{
+   unsigned long y, z, t;   
+
+   LTC_ARGCHK(words  != NULL);
+   LTC_ARGCHK(outlen != NULL);
+
+
+   /* must be >= 2 words */
+   if (nwords < 2) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* word1 = 0,1,2 and word2 0..39 */
+   if (words[0] > 2 || words[1] > 39) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* leading byte of first two words */
+   z = 1;
+   for (y = 2; y < nwords; y++) {
+       t = der_object_identifier_bits(words[y]);
+       z += t/7 + ((t%7) ? 1 : 0);
+   }
+
+   /* now depending on the length our length encoding changes */
+   if (z < 128) {
+      z += 2;
+   } else if (z < 256) {
+      z += 3;
+   } else if (z < 65536UL) {
+      z += 4;
+   } else {
+      return CRYPT_INVALID_ARG;
+   }
+
+   *outlen = z;
+   return CRYPT_OK;
+}
+
+#endif
+
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c,v $ */
+/* $Revision: 1.1 $ */
+/* $Date: 2005/05/16 15:08:11 $ */