Import of old SSLeay release: SSLeay 0.9.0b
[openssl.git] / demos / maurice / example4.c
1 /* NOCW */
2 /*
3         Please read the README file for condition of use, before
4         using this software.
5
6         Maurice Gittens  <mgittens@gits.nl>   January 1997
7
8 */
9
10 #include <stdio.h>
11 #include <fcntl.h>
12 #include <sys/stat.h>
13 #include <evp.h>
14
15 #define STDIN           0
16 #define STDOUT          1
17 #define BUFLEN          512 
18
19 static const char *usage = "Usage: example4 [-d]\n";
20
21 void do_encode(void);
22 void do_decode(void);
23
24 int main(int argc, char *argv[])
25 {
26         if ((argc == 1))        
27         {
28                 do_encode();
29         }       
30         else if ((argc == 2) && !strcmp(argv[1],"-d"))
31         {
32                 do_decode();
33         }
34         else
35         {
36                 fprintf(stderr,"%s", usage);
37                 exit(1);
38         }
39
40         return 0;               
41 }
42
43 void do_encode()
44 {
45         char buf[BUFLEN];
46         char ebuf[BUFLEN+24];
47         unsigned int ebuflen, rc;
48         EVP_ENCODE_CTX ectx;
49         
50         EVP_EncodeInit(&ectx);
51
52         while(1)
53         {
54                 int readlen = read(STDIN, buf, sizeof(buf));
55         
56                 if (readlen <= 0)
57                 {
58                         if (!readlen)
59                            break;
60                         else
61                         {
62                                 perror("read");
63                                 exit(1);
64                         }
65                 }
66
67                 EVP_EncodeUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
68
69                 write(STDOUT, ebuf, ebuflen);
70         }
71
72         EVP_EncodeFinal(&ectx, ebuf, &ebuflen); 
73
74         write(STDOUT, ebuf, ebuflen);
75 }
76
77 void do_decode()
78 {
79         char buf[BUFLEN];
80         char ebuf[BUFLEN+24];
81         unsigned int ebuflen, rc;
82         EVP_ENCODE_CTX ectx;
83         
84         EVP_DecodeInit(&ectx);
85
86         while(1)
87         {
88                 int readlen = read(STDIN, buf, sizeof(buf));
89                 int rc; 
90         
91                 if (readlen <= 0)
92                 {
93                         if (!readlen)
94                            break;
95                         else
96                         {
97                                 perror("read");
98                                 exit(1);
99                         }
100                 }
101
102                 rc = EVP_DecodeUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
103                 if (rc <= 0)
104                 {
105                         if (!rc)
106                         {
107                                 write(STDOUT, ebuf, ebuflen);
108                                 break;
109                         }
110
111                         fprintf(stderr, "Error: decoding message\n");
112                         return;
113                 }
114
115                 write(STDOUT, ebuf, ebuflen);
116         }
117
118         EVP_DecodeFinal(&ectx, ebuf, &ebuflen); 
119
120         write(STDOUT, ebuf, ebuflen); 
121 }
122