mirror of
https://github.com/guanzhi/GmSSL.git
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120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
/*
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* Copyright 2022 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <gmssl/mem.h>
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#include <gmssl/rand.h>
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static const char *options = "[-hex] [-rdrand] -outlen num [-out file]";
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int rand_main(int argc, char **argv)
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{
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int ret = 1;
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char *prog = argv[0];
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int hex = 0;
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int rdrand = 0;
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int outlen = 0;
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char *outfile = NULL;
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FILE *outfp = stdout;
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uint8_t buf[2048];
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int i;
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argc--;
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argv++;
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if (argc < 1) {
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fprintf(stderr, "usage: %s %s\n", prog, options);
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return 1;
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}
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while (argc > 0) {
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if (!strcmp(*argv, "-help")) {
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printf("usage: %s %s\n", prog, options);
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ret = 0;
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goto end;
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} else if (!strcmp(*argv, "-hex")) {
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hex = 1;
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} else if (!strcmp(*argv, "-rdrand")) {
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rdrand = 1;
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} else if (!strcmp(*argv, "-outlen")) {
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if (--argc < 1) goto bad;
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outlen = atoi(*(++argv));
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if (outlen < 1 || outlen > INT_MAX) {
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fprintf(stderr, "%s: invalid outlen\n", prog);
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goto end;
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}
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} else if (!strcmp(*argv, "-out")) {
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if (--argc < 1) goto bad;
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outfile = *(++argv);
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if (!(outfp = fopen(outfile, "w"))) {
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fprintf(stderr, "%s: open '%s' failure : %s\n", prog, outfile, strerror(errno));
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goto end;
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}
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} else {
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fprintf(stderr, "%s: illegal option '%s'\n", prog, *argv);
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goto end;
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bad:
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fprintf(stderr, "%s: '%s' option value missing\n", prog, *argv);
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goto end;
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}
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argc--;
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argv++;
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}
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if (!outlen) {
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fprintf(stderr, "%s: option -outlen missing\n", prog);
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goto end;
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}
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while (outlen) {
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size_t len = outlen < sizeof(buf) ? outlen : sizeof(buf);
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if (rdrand) {
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/*
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if (rdrand_bytes(buf, len) != 1) {
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fprintf(stderr, "%s: inner error\n", prog);
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goto end;
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}
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*/
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} else {
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if (rand_bytes(buf, len) != 1) {
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fprintf(stderr, "%s: inner error\n", prog);
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goto end;
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}
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}
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if (hex) {
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int i;
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for (i = 0; i < len; i++) {
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fprintf(outfp, "%02X", buf[i]);
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}
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} else {
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if (fwrite(buf, 1, len, outfp) != len) {
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fprintf(stderr, "%s: output failure : %s\n", prog, strerror(errno));
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goto end;
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}
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}
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outlen -= len;
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}
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if (hex) {
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fprintf(outfp, "\n");
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}
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ret = 0;
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end:
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gmssl_secure_clear(buf, sizeof(buf));
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if (outfile && outfp) fclose(outfp);
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return ret;
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}
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