1/*
2 * Copyright 2004-2018 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 <string.h>
11
12#include "apps.h"
13#include "progs.h"
14#include <openssl/bn.h>
15
16typedef enum OPTION_choice {
17    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
18    OPT_HEX, OPT_GENERATE, OPT_BITS, OPT_SAFE, OPT_CHECKS
19} OPTION_CHOICE;
20
21const OPTIONS prime_options[] = {
22    {OPT_HELP_STR, 1, '-', "Usage: %s [options] [number...]\n"},
23    {OPT_HELP_STR, 1, '-',
24        "  number Number to check for primality\n"},
25    {"help", OPT_HELP, '-', "Display this summary"},
26    {"hex", OPT_HEX, '-', "Hex output"},
27    {"generate", OPT_GENERATE, '-', "Generate a prime"},
28    {"bits", OPT_BITS, 'p', "Size of number in bits"},
29    {"safe", OPT_SAFE, '-',
30     "When used with -generate, generate a safe prime"},
31    {"checks", OPT_CHECKS, 'p', "Number of checks"},
32    {NULL}
33};
34
35int prime_main(int argc, char **argv)
36{
37    BIGNUM *bn = NULL;
38    int hex = 0, checks = 20, generate = 0, bits = 0, safe = 0, ret = 1;
39    char *prog;
40    OPTION_CHOICE o;
41
42    prog = opt_init(argc, argv, prime_options);
43    while ((o = opt_next()) != OPT_EOF) {
44        switch (o) {
45        case OPT_EOF:
46        case OPT_ERR:
47opthelp:
48            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
49            goto end;
50        case OPT_HELP:
51            opt_help(prime_options);
52            ret = 0;
53            goto end;
54        case OPT_HEX:
55            hex = 1;
56            break;
57        case OPT_GENERATE:
58            generate = 1;
59            break;
60        case OPT_BITS:
61            bits = atoi(opt_arg());
62            break;
63        case OPT_SAFE:
64            safe = 1;
65            break;
66        case OPT_CHECKS:
67            checks = atoi(opt_arg());
68            break;
69        }
70    }
71    argc = opt_num_rest();
72    argv = opt_rest();
73
74    if (generate) {
75        if (argc != 0) {
76            BIO_printf(bio_err, "Extra arguments given.\n");
77            goto opthelp;
78        }
79    } else if (argc == 0) {
80        BIO_printf(bio_err, "%s: No prime specified\n", prog);
81        goto opthelp;
82    }
83
84    if (generate) {
85        char *s;
86
87        if (!bits) {
88            BIO_printf(bio_err, "Specify the number of bits.\n");
89            goto end;
90        }
91        bn = BN_new();
92        if (bn == NULL) {
93            BIO_printf(bio_err, "Out of memory.\n");
94            goto end;
95        }
96        if (!BN_generate_prime_ex(bn, bits, safe, NULL, NULL, NULL)) {
97            BIO_printf(bio_err, "Failed to generate prime.\n");
98            goto end;
99        }
100        s = hex ? BN_bn2hex(bn) : BN_bn2dec(bn);
101        if (s == NULL) {
102            BIO_printf(bio_err, "Out of memory.\n");
103            goto end;
104        }
105        BIO_printf(bio_out, "%s\n", s);
106        OPENSSL_free(s);
107    } else {
108        for ( ; *argv; argv++) {
109            int r;
110
111            if (hex)
112                r = BN_hex2bn(&bn, argv[0]);
113            else
114                r = BN_dec2bn(&bn, argv[0]);
115
116            if (!r) {
117                BIO_printf(bio_err, "Failed to process value (%s)\n", argv[0]);
118                goto end;
119            }
120
121            BN_print(bio_out, bn);
122            BIO_printf(bio_out, " (%s) %s prime\n",
123                       argv[0],
124                       BN_is_prime_ex(bn, checks, NULL, NULL)
125                           ? "is" : "is not");
126        }
127    }
128
129    ret = 0;
130 end:
131    BN_free(bn);
132    return ret;
133}
134