?? ecc_export.c
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/* 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://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 $ */
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