(69 . 7)(69 . 9)
	/* mpi_powm can't handle output and input being same */
	assert (output != input);

  /* the actual rsa op */
	mpi_powm( output, input, pk->e, pk->n );

}

void secret_rsa( MPI output, MPI input, RSA_secret_key *skey ) {
(136 . 3)(138 . 94)

}

void rsa_oaep_encrypt( MPI output, MPI input, RSA_public_key *pk) {
  /* precondition: output is different from input */
  assert( output != input );

  /* precondition: output has enough memory allocated */
	unsigned int nlimbs_n = mpi_nlimb_hint_from_nbytes( KEY_LENGTH_OCTETS);
	assert( mpi_get_alloced( output ) >= nlimbs_n);

  /* precondition: input is at most max_len_msg octets long */
  unsigned int nlimbs_msg = mpi_nlimb_hint_from_nbytes( max_len_msg );
  assert( mpi_get_nlimbs( input ) <= nlimbs_msg);

  /* Step 1: oaep padding */
  /* get message char array and length */
  int msglen = 0;
  int sign;
  unsigned char * msg = mpi_get_buffer( input, &msglen, &sign);
  /* allocate memory for result */
  int encrlen = KEY_LENGTH_OCTETS;
  unsigned char * encr = xmalloc( encrlen );
  int entlen = KEY_LENGTH_OCTETS;
  unsigned char * entropy = xmalloc( entlen );
  int success = -10;
  /* call oaep until result is strictly < N of the rsa key to use */
  MPI oaep = mpi_alloc( nlimbs_n ); /* result of oaep encrypt/pad */

  int nread;
  do {
    /* get random bits */
		do {
      nread = get_random_octets( entlen, entropy );
		} while (nread != entlen);

    oaep_encrypt_c( msg, msglen, entropy, entlen, encr, encrlen, &success);
    if (success > 0) {
      /* set the obtained oaep to output mpi and compare to N of the rsa key */
      /* NB: 0-led encr WILL GET TRUNCATED!! */
      mpi_set_buffer( oaep, encr, encrlen, 0);
    }
    printf(".");
  }
  while ( success <=0 || mpi_cmp( oaep, pk->n ) >= 0 );

  printf("\n");
  /* Step2 : call rsa for final result */
  public_rsa( output, oaep, pk );

  /* clear up */
  xfree( msg );
  xfree( encr );
  xfree( entropy );
  mpi_free( oaep );
}

void rsa_oaep_decrypt( MPI output, MPI input, RSA_secret_key *sk, int *success)
{
  *success = -1;
	unsigned int nlimbs_n = mpi_nlimb_hint_from_nbytes( KEY_LENGTH_OCTETS);
  unsigned int nlimbs_msg = mpi_nlimb_hint_from_nbytes( max_len_msg );

  /* preconditions */
  assert( output != input );
	assert( mpi_get_alloced( output ) >= nlimbs_msg);
  assert( mpi_get_nlimbs( input )  == nlimbs_n);

  /* rsa */
  MPI rsa_decr = mpi_alloc( nlimbs_n );
  secret_rsa( rsa_decr, input, sk );

  /* oaep */
  unsigned encr_len, decr_len;
  int sign, flag;
  char *oaep_encr = mpi_get_buffer( rsa_decr, &encr_len, &sign );
  char *oaep_decr = xmalloc( encr_len );
  decr_len = encr_len;
  oaep_decrypt_c( oaep_encr, encr_len, oaep_decr, &decr_len, &flag );

  /* check status */
  if ( flag > 0 ) {
    *success = 1;
    mpi_set_buffer( output, oaep_decr, decr_len, 0 );
  }
  else
    *success = -1;

  /* cleanup */
  mpi_free( rsa_decr );
  xfree( oaep_encr );
  xfree( oaep_decr );
}