1 /*
2 Name: rtest.c
3 Purpose: Test routines for RSA implementation.
4 Author: M. J. Fromberger
5
6 Copyright (C) 2002-2008 Michael J. Fromberger, All Rights Reserved.
7
8 Permission is hereby granted, free of charge, to any person obtaining a copy
9 of this software and associated documentation files (the "Software"), to deal
10 in the Software without restriction, including without limitation the rights
11 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 copies of the Software, and to permit persons to whom the Software is
13 furnished to do so, subject to the following conditions:
14
15 The above copyright notice and this permission notice shall be included in
16 all copies or substantial portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 SOFTWARE.
25 */
26
27 #include <limits.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <time.h>
32
33 #include "rsamath.h"
34
35 void random_fill(unsigned char *buf, int len);
36 void print_buf(unsigned char *buf, int len, int brk, FILE *ofp);
37
main(int argc,char * argv[])38 int main(int argc, char *argv[]) {
39 int buf_len, msg_len, i;
40 unsigned char *buf;
41 mp_result res;
42
43 if (argc < 3) {
44 fprintf(stderr, "Usage: %s <bufsize> <msglen>\n", argv[0]);
45 return 1;
46 }
47
48 srand((unsigned int)time(NULL));
49
50 if ((buf_len = atoi(argv[1])) <= 0) {
51 fprintf(stderr, "Buffer length must be positive, not %d\n", buf_len);
52 return 2;
53 }
54 if ((msg_len = atoi(argv[2])) <= 0) {
55 fprintf(stderr, "Message length must be positive, not %d\n", msg_len);
56 return 2;
57 }
58 if (msg_len > buf_len) msg_len = buf_len;
59
60 buf = calloc(buf_len, sizeof(*buf));
61 for (i = 0; i < msg_len; ++i) buf[i] = i + 1;
62
63 printf(
64 "Buffer size: %d bytes\n"
65 "Message len: %d bytes\n\n",
66 buf_len, msg_len);
67
68 printf("Message:\n");
69 print_buf(buf, msg_len, 16, stdout);
70 fputc('\n', stdout);
71
72 if ((res = rsa_pkcs1v15_encode(buf, msg_len, buf_len, 2, random_fill)) !=
73 MP_OK) {
74 printf("Error from encoding function: %d\n", res);
75 free(buf);
76 return 1;
77 }
78 printf("Encoded message:\n");
79 print_buf(buf, buf_len, 16, stdout);
80 fputc('\n', stdout);
81
82 msg_len = -1; /* make decoder fill this in */
83 if ((res = rsa_pkcs1v15_decode(buf, buf_len, 2, &msg_len)) != MP_OK) {
84 printf("Error from decoding function: %d\n", res);
85 free(buf);
86 return 1;
87 }
88 printf("Decoded message (%d bytes):\n", msg_len);
89 print_buf(buf, msg_len, 16, stdout);
90 fputc('\n', stdout);
91
92 free(buf);
93 return 0;
94 }
95
random_fill(unsigned char * buf,int len)96 void random_fill(unsigned char *buf, int len) {
97 int i;
98
99 for (i = 0; i < len; ++i) {
100 unsigned char c = 0;
101
102 while (c == 0) c = (unsigned char)rand();
103
104 buf[i] = c;
105 }
106 }
107
print_buf(unsigned char * buf,int len,int brk,FILE * ofp)108 void print_buf(unsigned char *buf, int len, int brk, FILE *ofp) {
109 int i;
110
111 for (i = 0; i < len; ++i) {
112 fprintf(ofp, "%02X", buf[i]);
113
114 if ((i + 1) % brk == 0)
115 fputc('\n', ofp);
116 else
117 fputc(' ', ofp);
118 }
119 if (i % brk) fputc('\n', ofp);
120 }
121