--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtomcrypt/src/pk/ecc/ecc_export.c	Thu Jan 11 02:41:05 2007 +0000
@@ -0,0 +1,82 @@
+/* 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.com
+ */
+
+/* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
+ *
+ * All curves taken from NIST recommendation paper of July 1999
+ * Available at http://csrc.nist.gov/cryptval/dss.htm
+ */
+#include "tomcrypt.h"
+
+/**
+  @file ecc_export.c
+  ECC Crypto, Tom St Denis
+*/  
+
+#ifdef MECC
+
+/**
+  Export an ECC key as a binary packet
+  @param out     [out] Destination for the key
+  @param outlen  [in/out] Max size and resulting size of the exported key
+  @param type    The type of key you want to export (PK_PRIVATE or PK_PUBLIC)
+  @param key     The key to export
+  @return CRYPT_OK if successful
+*/
+int ecc_export(unsigned char *out, unsigned long *outlen, int type, ecc_key *key)
+{
+   int           err;
+   unsigned char flags[1];
+   unsigned long key_size;
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+   LTC_ARGCHK(key    != NULL);
+   
+   /* type valid? */
+   if (key->type != PK_PRIVATE && type == PK_PRIVATE) {
+      return CRYPT_PK_TYPE_MISMATCH;
+   }
+
+   if (ltc_ecc_is_valid_idx(key->idx) == 0) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* we store the NIST byte size */
+   key_size = key->dp->size;
+
+   if (type == PK_PRIVATE) {
+       flags[0] = 1;
+       err = der_encode_sequence_multi(out, outlen,
+                                 LTC_ASN1_BIT_STRING,      1UL, flags,
+                                 LTC_ASN1_SHORT_INTEGER,   1UL, &key_size,
+                                 LTC_ASN1_INTEGER,         1UL, key->pubkey.x,
+                                 LTC_ASN1_INTEGER,         1UL, key->pubkey.y,
+                                 LTC_ASN1_INTEGER,         1UL, key->k,
+                                 LTC_ASN1_EOL,             0UL, NULL);
+   } else {
+       flags[0] = 0;
+       err = der_encode_sequence_multi(out, outlen,
+                                 LTC_ASN1_BIT_STRING,      1UL, flags,
+                                 LTC_ASN1_SHORT_INTEGER,   1UL, &key_size,
+                                 LTC_ASN1_INTEGER,         1UL, key->pubkey.x,
+                                 LTC_ASN1_INTEGER,         1UL, key->pubkey.y,
+                                 LTC_ASN1_EOL,             0UL, NULL);
+   }
+
+   return err;
+}
+
+#endif
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_export.c,v $ */
+/* $Revision: 1.4 $ */
+/* $Date: 2006/11/21 00:10:18 $ */
+