xref: /openssl/crypto/rsa/rsa_none.c (revision 9311d0c4)
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 
RSA_padding_add_none(unsigned char * to,int tlen,const unsigned char * from,int flen)20 int RSA_padding_add_none(unsigned char *to, int tlen,
21                          const unsigned char *from, int flen)
22 {
23     if (flen > tlen) {
24         ERR_raise(ERR_LIB_RSA, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
25         return 0;
26     }
27 
28     if (flen < tlen) {
29         ERR_raise(ERR_LIB_RSA, 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 
RSA_padding_check_none(unsigned char * to,int tlen,const unsigned char * from,int flen,int num)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         ERR_raise(ERR_LIB_RSA, 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 }
50