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/*
* trng_extractor.c
* ----------------
* This program extracts raw data from the avalanche_entropy, rosc_entropy,
* and csprng cores.
*
* Author: Paul Selkirk
* Copyright (c) 2015, NORDUnet A/S All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the NORDUnet nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <ctype.h>
#include "cryptech.h"
char *usage =
"%s [-a|r|c] [-n #] [-o file]\n\
\n\
-a avalanche entropy\n\
-r rosc entropy\n\
-c csprng (default data source)\n\
-n number of 4-byte samples (scale with K, M, or G suffix)\n\
-o output file (defaults to stdout)\n\
";
/* extract one data sample */
static int extract(off_t status_addr, off_t data_addr, uint32_t *data)
{
if (tc_wait(status_addr, ENTROPY1_STATUS_VALID, NULL) != 0) {
fprintf(stderr, "tc_wait failed\n");
return 1;
}
if (tc_read(data_addr, (uint8_t *)data, 4) != 0) {
fprintf(stderr, "tc_read failed\n");
return 1;
}
return 0;
}
/* main */
int main(int argc, char *argv[])
{
int i, opt;
unsigned long num_words = 1;
char *endptr;
off_t status_addr = CSPRNG_ADDR_STATUS;
off_t data_addr = CSPRNG_ADDR_RANDOM;
FILE *output = stdout;
uint32_t data;
/* parse command line */
while ((opt = getopt(argc, argv, "h?arcn:o:")) != -1) {
switch (opt) {
case 'h':
case '?':
printf(usage, argv[0]);
return EXIT_SUCCESS;
case 'a':
status_addr = ENTROPY1_ADDR_STATUS;
data_addr = ENTROPY1_ADDR_ENTROPY;
break;
case 'r':
status_addr = ENTROPY2_ADDR_STATUS;
data_addr = ENTROPY2_ADDR_ENTROPY;
break;
case 'c':
status_addr = CSPRNG_ADDR_STATUS;
data_addr = CSPRNG_ADDR_RANDOM;
break;
case 'n':
num_words = strtoul(optarg, &endptr, 10);
switch (toupper(*endptr)) {
case '\0':
break;
case 'K':
num_words *= 1000;
break;
case 'M':
num_words *= 1000000;
break;
case 'G':
num_words *= 1000000000;
break;
default:
fprintf(stderr, "unsupported -n suffix %s\n", endptr);
return EXIT_FAILURE;
}
break;
case 'o':
output = fopen(optarg, "wb+");
if (output == NULL) {
fprintf(stderr, "error opening output file %s: ", optarg);
perror("");
return EXIT_FAILURE;
}
break;
default:
errout:
fprintf(stderr, usage, argv[0]);
return EXIT_FAILURE;
}
}
if (optind < argc) {
fprintf(stderr, "%s: invalid argument%s --",
argv[0], argc - optind > 1 ? "s" : "");
do {
fprintf(stderr, " %s", argv[optind]);
++optind;
} while (optind < argc);
fprintf(stderr, "\n");
goto errout;
}
/* get the data */
for (i = 0; i < num_words; ++i) {
if (extract(status_addr, data_addr, &data) != 0)
return EXIT_FAILURE;
if (fwrite(&data, sizeof(data), 1, output) != 1) {
perror("fwrite");
fclose(output);
return EXIT_FAILURE;
}
}
fclose(output);
return EXIT_SUCCESS;
}
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