62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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// Copyright 2018 Google LLC.
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//
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// This software is licensed under the terms defined in the Widevine Master
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// License Agreement. For a copy of this agreement, please contact
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// widevine-licensing@google.com.
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////////////////////////////////////////////////////////////////////////////////
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#include "common/signature_util.h"
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#include <memory>
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#include <string>
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#include "common/aes_cbc_util.h"
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#include "common/rsa_key.h"
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#include "common/sha_util.h"
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#include "common/status.h"
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namespace widevine {
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namespace signature_util {
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Status GenerateAesSignature(const std::string& message, const std::string& aes_key,
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const std::string& aes_iv, std::string* signature) {
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if (signature == nullptr) {
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return Status(error::INVALID_ARGUMENT, "signature is nullptr");
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}
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std::string hash = Sha1_Hash(message);
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if (hash.empty()) {
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return Status(error::INTERNAL, "Computed hash is empty");
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}
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std::string sig = crypto_util::EncryptAesCbc(aes_key, aes_iv, hash);
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if (sig.empty()) {
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return Status(error::INTERNAL, "Computed AES signature is empty");
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}
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*signature = sig;
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return OkStatus();
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}
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Status GenerateRsaSignature(const std::string& message, const std::string& private_key,
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std::string* signature) {
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if (signature == nullptr) {
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return Status(error::INVALID_ARGUMENT, "signature is nullptr");
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}
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std::unique_ptr<RsaPrivateKey> rsa_private_key(
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RsaPrivateKey::Create(private_key));
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if (rsa_private_key == nullptr) {
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return Status(error::INTERNAL, "Failed to construct a RsaPrivateKey");
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}
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std::string sig;
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if (!rsa_private_key->GenerateSignature(message, &sig)) {
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return Status(error::INTERNAL, "Failed to generate a RSA signature");
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}
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if (sig.empty()) {
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return Status(error::INTERNAL, "Computed RSA signature is empty");
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}
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*signature = sig;
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return OkStatus();
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}
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} // namespace signature_util
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} // namespace widevine
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