--- /dev/null
+/* 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.
+ */
+
+/* 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 LTC_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
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */
+