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/*
* Copyright 1998-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "apps.h"
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/rand.h>
typedef enum OPTION_choice {
OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
OPT_OUT, OPT_ENGINE, OPT_RAND, OPT_BASE64, OPT_HEX
} OPTION_CHOICE;
OPTIONS rand_options[] = {
{OPT_HELP_STR, 1, '-', "Usage: %s [flags] num\n"},
{OPT_HELP_STR, 1, '-', "Valid options are:\n"},
{"help", OPT_HELP, '-', "Display this summary"},
{"out", OPT_OUT, '>', "Output file"},
{"rand", OPT_RAND, 's',
"Load the file(s) into the random number generator"},
{"base64", OPT_BASE64, '-', "Base64 encode output"},
{"hex", OPT_HEX, '-', "Hex encode output"},
#ifndef OPENSSL_NO_ENGINE
{"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
#endif
{NULL}
};
int rand_main(int argc, char **argv)
{
ENGINE *e = NULL;
BIO *out = NULL;
char *inrand = NULL, *outfile = NULL, *prog;
OPTION_CHOICE o;
int format = FORMAT_BINARY, i, num = -1, r, ret = 1;
prog = opt_init(argc, argv, rand_options);
while ((o = opt_next()) != OPT_EOF) {
switch (o) {
case OPT_EOF:
case OPT_ERR:
opthelp:
BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
goto end;
case OPT_HELP:
opt_help(rand_options);
ret = 0;
goto end;
case OPT_OUT:
outfile = opt_arg();
break;
case OPT_ENGINE:
e = setup_engine(opt_arg(), 0);
break;
case OPT_RAND:
inrand = opt_arg();
break;
case OPT_BASE64:
format = FORMAT_BASE64;
break;
case OPT_HEX:
format = FORMAT_TEXT;
break;
}
}
argc = opt_num_rest();
argv = opt_rest();
if (argc == 1) {
if (!opt_int(argv[0], &num) || num <= 0)
goto end;
} else if (argc > 0) {
BIO_printf(bio_err, "Extra arguments given.\n");
goto opthelp;
}
app_RAND_load_file(NULL, (inrand != NULL));
if (inrand != NULL)
BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
app_RAND_load_files(inrand));
out = bio_open_default(outfile, 'w', format);
if (out == NULL)
goto end;
if (format == FORMAT_BASE64) {
BIO *b64 = BIO_new(BIO_f_base64());
if (b64 == NULL)
goto end;
out = BIO_push(b64, out);
}
while (num > 0) {
unsigned char buf[4096];
int chunk;
chunk = num;
if (chunk > (int)sizeof(buf))
chunk = sizeof(buf);
r = RAND_bytes(buf, chunk);
if (r <= 0)
goto end;
if (format != FORMAT_TEXT) {
if (BIO_write(out, buf, chunk) != chunk)
goto end;
} else {
for (i = 0; i < chunk; i++)
if (BIO_printf(out, "%02x", buf[i]) != 2)
goto end;
}
num -= chunk;
}
if (format == FORMAT_TEXT)
BIO_puts(out, "\n");
if (BIO_flush(out) <= 0 || !app_RAND_write_file(NULL))
goto end;
ret = 0;
end:
if (ret != 0)
ERR_print_errors(bio_err);
release_engine(e);
BIO_free_all(out);
return (ret);
}
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