Mirror of BoringSSL (grpc依赖)
https://boringssl.googlesource.com/boringssl
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97 lines
2.5 KiB
97 lines
2.5 KiB
4 years ago
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/* Copyright (c) 2015, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#include <string>
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#include <vector>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <openssl/rand.h>
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#include "internal.h"
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static const struct argument kArguments[] = {
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{
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"-hex", kBooleanArgument,
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"Hex encoded output."
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},
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{
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"", kOptionalArgument, "",
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},
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};
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bool Rand(const std::vector<std::string> &args) {
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bool forever = true, hex = false;
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size_t len = 0;
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if (!args.empty()) {
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std::vector<std::string> args_copy(args);
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const std::string &last_arg = args.back();
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if (!last_arg.empty() && last_arg[0] != '-') {
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char *endptr;
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unsigned long long num = strtoull(last_arg.c_str(), &endptr, 10);
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if (*endptr == 0) {
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len = num;
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forever = false;
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args_copy.pop_back();
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}
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}
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std::map<std::string, std::string> args_map;
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if (!ParseKeyValueArguments(&args_map, args_copy, kArguments)) {
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PrintUsage(kArguments);
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return false;
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}
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hex = args_map.count("-hex") > 0;
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}
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uint8_t buf[4096];
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uint8_t hex_buf[8192];
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size_t done = 0;
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while (forever || done < len) {
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size_t todo = sizeof(buf);
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if (!forever && todo > len - done) {
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todo = len - done;
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}
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RAND_bytes(buf, todo);
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if (hex) {
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static const char hextable[16 + 1] = "0123456789abcdef";
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for (unsigned i = 0; i < todo; i++) {
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hex_buf[i*2] = hextable[buf[i] >> 4];
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hex_buf[i*2 + 1] = hextable[buf[i] & 0xf];
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}
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if (fwrite(hex_buf, todo*2, 1, stdout) != 1) {
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return false;
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}
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} else {
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if (fwrite(buf, todo, 1, stdout) != 1) {
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return false;
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}
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}
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done += todo;
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}
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if (hex && fwrite("\n", 1, 1, stdout) != 1) {
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return false;
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}
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return true;
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}
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