84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
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/* Copyright (c) 2017, 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 <map>
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#include <vector>
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#include <openssl/bio.h>
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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#include "internal.h"
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static const struct argument kArguments[] = {
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{"-key", kRequiredArgument, "The private key, in PEM format, to sign with"},
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{"-digest", kOptionalArgument, "The digest algorithm to use"},
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{"", kOptionalArgument, ""},
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};
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bool Sign(const std::vector<std::string> &args) {
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std::map<std::string, std::string> args_map;
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if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
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PrintUsage(kArguments);
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return false;
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}
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// Load the private key.
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bssl::UniquePtr<BIO> bio(BIO_new(BIO_s_file()));
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if (!bio || !BIO_read_filename(bio.get(), args_map["-key"].c_str())) {
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return false;
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}
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bssl::UniquePtr<EVP_PKEY> key(
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PEM_read_bio_PrivateKey(bio.get(), nullptr, nullptr, nullptr));
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if (!key) {
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return false;
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}
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const EVP_MD *md = nullptr;
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if (args_map.count("-digest")) {
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md = EVP_get_digestbyname(args_map["-digest"].c_str());
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if (md == nullptr) {
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fprintf(stderr, "Unknown digest algorithm: %s\n",
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args_map["-digest"].c_str());
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return false;
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}
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}
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bssl::ScopedEVP_MD_CTX ctx;
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if (!EVP_DigestSignInit(ctx.get(), nullptr, md, nullptr, key.get())) {
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return false;
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}
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std::vector<uint8_t> data;
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if (!ReadAll(&data, stdin)) {
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fprintf(stderr, "Error reading input.\n");
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return false;
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}
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size_t sig_len = EVP_PKEY_size(key.get());
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std::unique_ptr<uint8_t[]> sig(new uint8_t[sig_len]);
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if (!EVP_DigestSign(ctx.get(), sig.get(), &sig_len, data.data(),
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data.size())) {
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return false;
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}
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if (fwrite(sig.get(), 1, sig_len, stdout) != sig_len) {
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fprintf(stderr, "Error writing signature.\n");
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return false;
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}
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return true;
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}
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