1 /*
2 * Copyright 1998-2022 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 #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_COMMON,
23 OPT_OUT, OPT_ENGINE, OPT_BASE64, OPT_HEX,
24 OPT_R_ENUM, OPT_PROV_ENUM
25 } OPTION_CHOICE;
26
27 const OPTIONS rand_options[] = {
28 {OPT_HELP_STR, 1, '-', "Usage: %s [options] num\n"},
29
30 OPT_SECTION("General"),
31 {"help", OPT_HELP, '-', "Display this summary"},
32 #ifndef OPENSSL_NO_ENGINE
33 {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
34 #endif
35
36 OPT_SECTION("Output"),
37 {"out", OPT_OUT, '>', "Output file"},
38 {"base64", OPT_BASE64, '-', "Base64 encode output"},
39 {"hex", OPT_HEX, '-', "Hex encode output"},
40
41 OPT_R_OPTIONS,
42 OPT_PROV_OPTIONS,
43
44 OPT_PARAMETERS(),
45 {"num", 0, 0, "Number of bytes to generate"},
46 {NULL}
47 };
48
rand_main(int argc,char ** argv)49 int rand_main(int argc, char **argv)
50 {
51 ENGINE *e = NULL;
52 BIO *out = NULL;
53 char *outfile = NULL, *prog;
54 OPTION_CHOICE o;
55 int format = FORMAT_BINARY, r, i, ret = 1, buflen = 131072;
56 long num = -1;
57 uint8_t *buf = NULL;
58
59 prog = opt_init(argc, argv, rand_options);
60 while ((o = opt_next()) != OPT_EOF) {
61 switch (o) {
62 case OPT_EOF:
63 case OPT_ERR:
64 opthelp:
65 BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
66 goto end;
67 case OPT_HELP:
68 opt_help(rand_options);
69 ret = 0;
70 goto end;
71 case OPT_OUT:
72 outfile = opt_arg();
73 break;
74 case OPT_ENGINE:
75 e = setup_engine(opt_arg(), 0);
76 break;
77 case OPT_R_CASES:
78 if (!opt_rand(o))
79 goto end;
80 break;
81 case OPT_BASE64:
82 format = FORMAT_BASE64;
83 break;
84 case OPT_HEX:
85 format = FORMAT_TEXT;
86 break;
87 case OPT_PROV_CASES:
88 if (!opt_provider(o))
89 goto end;
90 break;
91 }
92 }
93
94 /* Optional argument is number of bytes to generate. */
95 argc = opt_num_rest();
96 argv = opt_rest();
97 if (argc == 1) {
98 if (!opt_long(argv[0], &num) || num <= 0)
99 goto opthelp;
100 } else if (!opt_check_rest_arg(NULL)) {
101 goto opthelp;
102 }
103
104 if (!app_RAND_load())
105 goto end;
106
107 out = bio_open_default(outfile, 'w', format);
108 if (out == NULL)
109 goto end;
110
111 if (format == FORMAT_BASE64) {
112 BIO *b64 = BIO_new(BIO_f_base64());
113 if (b64 == NULL)
114 goto end;
115 out = BIO_push(b64, out);
116 }
117
118 buf = app_malloc(buflen, "buffer for output file");
119 while (num > 0) {
120 long chunk;
121
122 chunk = (num > buflen) ? buflen : num;
123 r = RAND_bytes(buf, chunk);
124 if (r <= 0)
125 goto end;
126 if (format != FORMAT_TEXT) {
127 if (BIO_write(out, buf, chunk) != chunk)
128 goto end;
129 } else {
130 for (i = 0; i < chunk; i++)
131 if (BIO_printf(out, "%02x", buf[i]) != 2)
132 goto end;
133 }
134 num -= chunk;
135 }
136 if (format == FORMAT_TEXT)
137 BIO_puts(out, "\n");
138 if (BIO_flush(out) <= 0)
139 goto end;
140
141 ret = 0;
142
143 end:
144 if (ret != 0)
145 ERR_print_errors(bio_err);
146 OPENSSL_free(buf);
147 release_engine(e);
148 BIO_free_all(out);
149 return ret;
150 }
151
