xref: /freebsd/crypto/openssl/apps/rand.c (revision cfd6422a5217410fbd66f7a7a8a64d9d85e61229)
1 /*
2  * Copyright 1998-2018 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 "apps.h"
11 #include "progs.h"
12 
13 #include <ctype.h>
14 #include <stdio.h>
15 #include <string.h>
16 
17 #include <openssl/bio.h>
18 #include <openssl/err.h>
19 #include <openssl/rand.h>
20 
21 typedef enum OPTION_choice {
22     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
23     OPT_OUT, OPT_ENGINE, OPT_BASE64, OPT_HEX,
24     OPT_R_ENUM
25 } OPTION_CHOICE;
26 
27 const OPTIONS rand_options[] = {
28     {OPT_HELP_STR, 1, '-', "Usage: %s [flags] num\n"},
29     {OPT_HELP_STR, 1, '-', "Valid options are:\n"},
30     {"help", OPT_HELP, '-', "Display this summary"},
31     {"out", OPT_OUT, '>', "Output file"},
32     OPT_R_OPTIONS,
33     {"base64", OPT_BASE64, '-', "Base64 encode output"},
34     {"hex", OPT_HEX, '-', "Hex encode output"},
35 #ifndef OPENSSL_NO_ENGINE
36     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
37 #endif
38     {NULL}
39 };
40 
41 int rand_main(int argc, char **argv)
42 {
43     ENGINE *e = NULL;
44     BIO *out = NULL;
45     char *outfile = NULL, *prog;
46     OPTION_CHOICE o;
47     int format = FORMAT_BINARY, i, num = -1, r, ret = 1;
48 
49     prog = opt_init(argc, argv, rand_options);
50     while ((o = opt_next()) != OPT_EOF) {
51         switch (o) {
52         case OPT_EOF:
53         case OPT_ERR:
54  opthelp:
55             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
56             goto end;
57         case OPT_HELP:
58             opt_help(rand_options);
59             ret = 0;
60             goto end;
61         case OPT_OUT:
62             outfile = opt_arg();
63             break;
64         case OPT_ENGINE:
65             e = setup_engine(opt_arg(), 0);
66             break;
67         case OPT_R_CASES:
68             if (!opt_rand(o))
69                 goto end;
70             break;
71         case OPT_BASE64:
72             format = FORMAT_BASE64;
73             break;
74         case OPT_HEX:
75             format = FORMAT_TEXT;
76             break;
77         }
78     }
79     argc = opt_num_rest();
80     argv = opt_rest();
81     if (argc == 1) {
82         if (!opt_int(argv[0], &num) || num <= 0)
83             goto end;
84     } else if (argc > 0) {
85         BIO_printf(bio_err, "Extra arguments given.\n");
86         goto opthelp;
87     }
88 
89     out = bio_open_default(outfile, 'w', format);
90     if (out == NULL)
91         goto end;
92 
93     if (format == FORMAT_BASE64) {
94         BIO *b64 = BIO_new(BIO_f_base64());
95         if (b64 == NULL)
96             goto end;
97         out = BIO_push(b64, out);
98     }
99 
100     while (num > 0) {
101         unsigned char buf[4096];
102         int chunk;
103 
104         chunk = num;
105         if (chunk > (int)sizeof(buf))
106             chunk = sizeof(buf);
107         r = RAND_bytes(buf, chunk);
108         if (r <= 0)
109             goto end;
110         if (format != FORMAT_TEXT) {
111             if (BIO_write(out, buf, chunk) != chunk)
112                 goto end;
113         } else {
114             for (i = 0; i < chunk; i++)
115                 if (BIO_printf(out, "%02x", buf[i]) != 2)
116                     goto end;
117         }
118         num -= chunk;
119     }
120     if (format == FORMAT_TEXT)
121         BIO_puts(out, "\n");
122     if (BIO_flush(out) <= 0)
123         goto end;
124 
125     ret = 0;
126 
127  end:
128     if (ret != 0)
129         ERR_print_errors(bio_err);
130     release_engine(e);
131     BIO_free_all(out);
132     return ret;
133 }
134