crypto/rsa/rsa_none.c

   1 /*
   2  * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib.h"
  11 #include <openssl/bn.h>
  12 #include <openssl/rsa.h>
  13 #include <openssl/rand.h>
  14
  15 int RSA_padding_add_none(unsigned char *to, int tlen,
  16                          const unsigned char *from, int flen)
  17 {
  18     if (flen > tlen) {
  19         RSAerr(RSA_F_RSA_PADDING_ADD_NONE, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
  20         return (0);
  21     }
  22
  23     if (flen < tlen) {
  24         RSAerr(RSA_F_RSA_PADDING_ADD_NONE, RSA_R_DATA_TOO_SMALL_FOR_KEY_SIZE);
  25         return (0);
  26     }
  27
  28     memcpy(to, from, (unsigned int)flen);
  29     return (1);
  30 }
  31
  32 int RSA_padding_check_none(unsigned char *to, int tlen,
  33                            const unsigned char *from, int flen, int num)
  34 {
  35
  36     if (flen > tlen) {
  37         RSAerr(RSA_F_RSA_PADDING_CHECK_NONE, RSA_R_DATA_TOO_LARGE);
  38         return (-1);
  39     }
  40
  41     memset(to, 0, tlen - flen);
  42     memcpy(to + tlen - flen, from, flen);
  43     return (tlen);
  44 }