/* 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@iahu.ca, http://libtomcrypt.org */#include "mycrypt.h"#ifdef MRSAint rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key){   unsigned long x, y;   int err;   _ARGCHK(in  != NULL);   _ARGCHK(key != NULL);   /* check length */   if (inlen < (1+PACKET_SIZE)) {      return CRYPT_INVALID_PACKET;   }   /* test packet header */   if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_RSA, PACKET_SUB_KEY)) != CRYPT_OK) {      return err;   }   /* init key */   if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP,                     &key->pQ, &key->p, &key->q, NULL)) != MP_OKAY) {      return mpi_to_ltc_error(err);   }   /* get key type */   y = PACKET_SIZE;   key->type = (int)in[y++];   /* load the modulus  */   INPUT_BIGNUM(&key->N, in, x, y, inlen);   /* load public exponent */   INPUT_BIGNUM(&key->e, in, x, y, inlen);   /* get private exponent */   if (key->type == PK_PRIVATE || key->type == PK_PRIVATE_OPTIMIZED) {      INPUT_BIGNUM(&key->d, in, x, y, inlen);   }   /* get CRT private data if required */   if (key->type == PK_PRIVATE_OPTIMIZED) {      INPUT_BIGNUM(&key->dQ, in, x, y, inlen);      INPUT_BIGNUM(&key->dP, in, x, y, inlen);      INPUT_BIGNUM(&key->pQ, in, x, y, inlen);      INPUT_BIGNUM(&key->qP, in, x, y, inlen);      INPUT_BIGNUM(&key->p, in, x, y, inlen);      INPUT_BIGNUM(&key->q, in, x, y, inlen);   }   /* free up ram not required */   if (key->type != PK_PRIVATE_OPTIMIZED) {      mp_clear_multi(&key->dQ, &key->dP, &key->pQ, &key->qP, &key->p, &key->q, NULL);   }   if (key->type != PK_PRIVATE && key->type != PK_PRIVATE_OPTIMIZED) {      mp_clear(&key->d);   }   return CRYPT_OK;error:   mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,                  &key->pQ, &key->qP, &key->p, &key->q, NULL);   return err;}#endif /* MRSA */