/* 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.org */#include "tomcrypt.h"/**  @file rsa_export.c  Export RSA PKCS keys, Tom St Denis*/  #ifdef MRSA/**    This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1]     @param out       [out] Destination of the packet    @param outlen    [in/out] The max size and resulting size of the packet    @param type      The type of exported key (PK_PRIVATE or PK_PUBLIC)    @param key       The RSA key to export    @return CRYPT_OK if successful*/    int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key){   int           err;   unsigned long zero=0;   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_INVALID_TYPE;   }   if (type == PK_PRIVATE) {      /* private key */      /* output is             Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p       */      if ((err = der_encode_sequence_multi(out, outlen,                           LTC_ASN1_SHORT_INTEGER, 1UL, &zero,                           LTC_ASN1_INTEGER, 1UL, &key->N,                           LTC_ASN1_INTEGER, 1UL, &key->e,                          LTC_ASN1_INTEGER, 1UL, &key->d,                           LTC_ASN1_INTEGER, 1UL, &key->p,                           LTC_ASN1_INTEGER, 1UL, &key->q,                           LTC_ASN1_INTEGER, 1UL, &key->dP,                          LTC_ASN1_INTEGER, 1UL, &key->dQ,                           LTC_ASN1_INTEGER, 1UL, &key->qP,                           LTC_ASN1_EOL,     0UL, NULL)) != CRYPT_OK) {         return err;      }       /* clear zero and return */      return CRYPT_OK;   } else {      /* public key */      return der_encode_sequence_multi(out, outlen,                                  LTC_ASN1_INTEGER, 1UL, &key->N,                                  LTC_ASN1_INTEGER, 1UL, &key->e,                                  LTC_ASN1_EOL,     0UL, NULL);   }}#endif /* MRSA *//* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_export.c,v $ *//* $Revision: 1.11 $ *//* $Date: 2005/06/04 01:42:48 $ */