Raise max RSA keysize (WIP)

*** 84,94 ****
          int             sign;   /* 1 for nonnegative, -1 for negative  */
          int             malloced; /* 1 if value was malloced, 0 if not */
          BIG_CHUNK_TYPE *value;
  } BIGNUM;
  
! #define BIGTMPSIZE 65
  
  #define BIG_TRUE 1
  #define BIG_FALSE 0
  
  typedef int BIG_ERR_CODE;
--- 84,94 ----
          int             sign;   /* 1 for nonnegative, -1 for negative  */
          int             malloced; /* 1 if value was malloced, 0 if not */
          BIG_CHUNK_TYPE *value;
  } BIGNUM;
  
! #define BIGTMPSIZE 257
  
  #define BIG_TRUE 1
  #define BIG_FALSE 0
  
  typedef int BIG_ERR_CODE;