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- /* Copyright (c) 2017, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- #include <map>
- #include <vector>
-
- #include <openssl/bio.h>
- #include <openssl/evp.h>
- #include <openssl/pem.h>
-
- #include "internal.h"
-
-
- static const struct argument kArguments[] = {
- {"-key", kRequiredArgument, "The private key, in PEM format, to sign with"},
- {"-digest", kOptionalArgument, "The digest algorithm to use"},
- {"", kOptionalArgument, ""},
- };
-
- bool Sign(const std::vector<std::string> &args) {
- std::map<std::string, std::string> args_map;
- if (!ParseKeyValueArguments(&args_map, args, kArguments)) {
- PrintUsage(kArguments);
- return false;
- }
-
- // Load the private key.
- bssl::UniquePtr<BIO> bio(BIO_new(BIO_s_file()));
- if (!bio || !BIO_read_filename(bio.get(), args_map["-key"].c_str())) {
- return false;
- }
- bssl::UniquePtr<EVP_PKEY> key(
- PEM_read_bio_PrivateKey(bio.get(), nullptr, nullptr, nullptr));
- if (!key) {
- return false;
- }
-
- // Setup the signing operation.
- bssl::UniquePtr<EVP_PKEY_CTX> ctx(EVP_PKEY_CTX_new(key.get(), nullptr));
- if (!ctx ||
- !EVP_PKEY_sign_init(ctx.get())) {
- return false;
- }
-
- if (args_map.count("-digest")) {
- const EVP_MD *md = EVP_get_digestbyname(args_map["-digest"].c_str());
- if (md == nullptr) {
- fprintf(stderr, "Unknown digest algorithm: %s\n",
- args_map["-digest"].c_str());
- return false;
- }
-
- if (!EVP_PKEY_CTX_set_signature_md(ctx.get(), md)) {
- return false;
- }
- }
-
- std::vector<uint8_t> data;
- if (!ReadAll(&data, stdin)) {
- fprintf(stderr, "Error reading input.\n");
- return false;
- }
-
- size_t sig_len = EVP_PKEY_size(key.get());
- std::unique_ptr<uint8_t[]> sig(new uint8_t[sig_len]);
- if (!EVP_PKEY_sign_message(ctx.get(), sig.get(), &sig_len, data.data(),
- data.size())) {
- return false;
- }
-
- if (fwrite(sig.get(), 1, sig_len, stdout) != sig_len) {
- fprintf(stderr, "Error writing signature.\n");
- return false;
- }
-
- return true;
- }
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