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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/ssl/openssl_private_key.h"
#include "base/check.h"
#include "net/base/net_errors.h"
#include "net/ssl/ssl_platform_key_util.h"
#include "net/ssl/ssl_private_key.h"
#include "net/ssl/threaded_ssl_private_key.h"
#include "third_party/boringssl/src/include/openssl/evp.h"
#include "third_party/boringssl/src/include/openssl/rsa.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"
namespace net {
namespace {
class OpenSSLPrivateKey : public ThreadedSSLPrivateKey::Delegate {
public:
explicit OpenSSLPrivateKey(bssl::UniquePtr<EVP_PKEY> key)
: key_(std::move(key)) {}
OpenSSLPrivateKey(const OpenSSLPrivateKey&) = delete;
OpenSSLPrivateKey& operator=(const OpenSSLPrivateKey&) = delete;
~OpenSSLPrivateKey() override = default;
std::string GetProviderName() override { return "EVP_PKEY"; }
std::vector<uint16_t> GetAlgorithmPreferences() override {
return SSLPrivateKey::DefaultAlgorithmPreferences(EVP_PKEY_id(key_.get()),
true /* supports PSS */);
}
Error Sign(uint16_t algorithm,
base::span<const uint8_t> input,
std::vector<uint8_t>* signature) override {
bssl::ScopedEVP_MD_CTX ctx;
EVP_PKEY_CTX* pctx;
if (!EVP_DigestSignInit(ctx.get(), &pctx,
SSL_get_signature_algorithm_digest(algorithm),
nullptr, key_.get())) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
if (SSL_is_signature_algorithm_rsa_pss(algorithm)) {
if (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
!EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1 /* hash length */)) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
}
size_t sig_len = 0;
if (!EVP_DigestSign(ctx.get(), nullptr, &sig_len, input.data(),
input.size())) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
signature->resize(sig_len);
if (!EVP_DigestSign(ctx.get(), signature->data(), &sig_len, input.data(),
input.size())) {
return ERR_SSL_CLIENT_AUTH_SIGNATURE_FAILED;
}
signature->resize(sig_len);
return OK;
}
private:
bssl::UniquePtr<EVP_PKEY> key_;
};
} // namespace
scoped_refptr<SSLPrivateKey> WrapOpenSSLPrivateKey(
bssl::UniquePtr<EVP_PKEY> key) {
CHECK(key);
return base::MakeRefCounted<ThreadedSSLPrivateKey>(
std::make_unique<OpenSSLPrivateKey>(std::move(key)),
GetSSLPlatformKeyTaskRunner());
}
} // namespace net
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