1/*
2 * Copyright 1998-2021 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
21typedef 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
27const 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
49int 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, i, num = -1, r, ret = 1;
56
57    prog = opt_init(argc, argv, rand_options);
58    while ((o = opt_next()) != OPT_EOF) {
59        switch (o) {
60        case OPT_EOF:
61        case OPT_ERR:
62 opthelp:
63            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
64            goto end;
65        case OPT_HELP:
66            opt_help(rand_options);
67            ret = 0;
68            goto end;
69        case OPT_OUT:
70            outfile = opt_arg();
71            break;
72        case OPT_ENGINE:
73            e = setup_engine(opt_arg(), 0);
74            break;
75        case OPT_R_CASES:
76            if (!opt_rand(o))
77                goto end;
78            break;
79        case OPT_BASE64:
80            format = FORMAT_BASE64;
81            break;
82        case OPT_HEX:
83            format = FORMAT_TEXT;
84            break;
85        case OPT_PROV_CASES:
86            if (!opt_provider(o))
87                goto end;
88            break;
89        }
90    }
91
92    /* Optional argument is number of bytes to generate. */
93    argc = opt_num_rest();
94    argv = opt_rest();
95    if (argc == 1) {
96        if (!opt_int(argv[0], &num) || num <= 0)
97            goto opthelp;
98    } else if (argc != 0) {
99        goto opthelp;
100    }
101
102    if (!app_RAND_load())
103        goto end;
104
105    out = bio_open_default(outfile, 'w', format);
106    if (out == NULL)
107        goto end;
108
109    if (format == FORMAT_BASE64) {
110        BIO *b64 = BIO_new(BIO_f_base64());
111        if (b64 == NULL)
112            goto end;
113        out = BIO_push(b64, out);
114    }
115
116    while (num > 0) {
117        unsigned char buf[4096];
118        int chunk;
119
120        chunk = num;
121        if (chunk > (int)sizeof(buf))
122            chunk = sizeof(buf);
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    release_engine(e);
147    BIO_free_all(out);
148    return ret;
149}
150