crypto/rsa/rsa_none.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 /*
  11  * RSA low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include "internal/cryptlib.h"
  17 #include <openssl/bn.h>
  18 #include <openssl/rsa.h>
  19
  20 int RSA_padding_add_none(unsigned char *to, int tlen,
  21                          const unsigned char *from, int flen)
  22 {
  23     if (flen > tlen) {
  24         RSAerr(RSA_F_RSA_PADDING_ADD_NONE, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
  25         return 0;
  26     }
  27
  28     if (flen < tlen) {
  29         RSAerr(RSA_F_RSA_PADDING_ADD_NONE, RSA_R_DATA_TOO_SMALL_FOR_KEY_SIZE);
  30         return 0;
  31     }
  32
  33     memcpy(to, from, (unsigned int)flen);
  34     return 1;
  35 }
  36
  37 int RSA_padding_check_none(unsigned char *to, int tlen,
  38                            const unsigned char *from, int flen, int num)
  39 {
  40
  41     if (flen > tlen) {
  42         RSAerr(RSA_F_RSA_PADDING_CHECK_NONE, RSA_R_DATA_TOO_LARGE);
  43         return -1;
  44     }
  45
  46     memset(to, 0, tlen - flen);
  47     memcpy(to + tlen - flen, from, flen);
  48     return tlen;
  49 }