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
21typedef 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
27const 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
41int 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