text: /*
   * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include "internal/cryptlib.h"
  #include <openssl/bn.h>
  #include <openssl/rsa.h>
  
  int RSA_padding_add_none(unsigned char *to, int tlen,
                           const unsigned char *from, int flen)
  {
      if (flen > tlen) {
          RSAerr(RSA_F_RSA_PADDING_ADD_NONE, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
          return (0);
      }
  
      if (flen < tlen) {
          RSAerr(RSA_F_RSA_PADDING_ADD_NONE, RSA_R_DATA_TOO_SMALL_FOR_KEY_SIZE);
          return (0);
      }
  
      memcpy(to, from, (unsigned int)flen);
      return (1);
  }
  
  int RSA_padding_check_none(unsigned char *to, int tlen,
                             const unsigned char *from, int flen, int num)
  {
  
      if (flen > tlen) {
          RSAerr(RSA_F_RSA_PADDING_CHECK_NONE, RSA_R_DATA_TOO_LARGE);
          return (-1);
      }
  
      memset(to, 0, tlen - flen);
      memcpy(to + tlen - flen, from, flen);
      return (tlen);
  }
  