/* 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 MDSAint dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key){   unsigned long y, z;   int err;   _ARGCHK(out    != NULL);   _ARGCHK(outlen != NULL);   _ARGCHK(key    != NULL);   /* can we store the static header?  */   if (*outlen < (PACKET_SIZE + 1 + 2)) {      return CRYPT_BUFFER_OVERFLOW;   }      if (type == PK_PRIVATE && key->type != PK_PRIVATE) {      return CRYPT_PK_TYPE_MISMATCH;   }   if (type != PK_PUBLIC && type != PK_PRIVATE) {      return CRYPT_INVALID_ARG;   }   /* store header */   packet_store_header(out, PACKET_SECT_DSA, PACKET_SUB_KEY);   y = PACKET_SIZE;   /* store g, p, q, qord */   out[y++] = type;   out[y++] = (key->qord>>8)&255;   out[y++] = key->qord & 255;   OUTPUT_BIGNUM(&key->g,out,y,z);   OUTPUT_BIGNUM(&key->p,out,y,z);   OUTPUT_BIGNUM(&key->q,out,y,z);   /* public exponent */   OUTPUT_BIGNUM(&key->y,out,y,z);      if (type == PK_PRIVATE) {      OUTPUT_BIGNUM(&key->x,out,y,z);   }   *outlen = y;   return CRYPT_OK;}#endif