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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/evp.h"
#include "base/containers/to_vector.h"
#include "third_party/boringssl/src/include/openssl/bytestring.h"
namespace {
base::span<const uint8_t> CBBToSpan(CBB* cbb) {
// SAFETY: BoringSSL ensures that CBBs always have CBB_len() bytes available
// at their CBB_data() pointer.
UNSAFE_BUFFERS(return base::span<const uint8_t>(CBB_data(cbb), CBB_len(cbb));)
}
} // namespace
namespace crypto::evp {
bssl::UniquePtr<EVP_PKEY> PublicKeyFromBytes(base::span<const uint8_t> bytes) {
CBS cbs;
CBS_init(&cbs, bytes.data(), bytes.size());
bssl::UniquePtr<EVP_PKEY> key(EVP_parse_public_key(&cbs));
if (CBS_len(&cbs) != 0) {
key.reset();
}
return key;
}
bssl::UniquePtr<EVP_PKEY> PrivateKeyFromBytes(base::span<const uint8_t> bytes) {
CBS cbs;
CBS_init(&cbs, bytes.data(), bytes.size());
bssl::UniquePtr<EVP_PKEY> key(EVP_parse_private_key(&cbs));
if (CBS_len(&cbs) != 0) {
key.reset();
}
return key;
}
std::vector<uint8_t> PublicKeyToBytes(const EVP_PKEY* key) {
bssl::ScopedCBB cbb;
CHECK(CBB_init(cbb.get(), 0));
CHECK(EVP_marshal_public_key(cbb.get(), key));
return base::ToVector(CBBToSpan(cbb.get()));
}
std::vector<uint8_t> PrivateKeyToBytes(const EVP_PKEY* key) {
bssl::ScopedCBB cbb;
CHECK(CBB_init(cbb.get(), 0));
CHECK(EVP_marshal_private_key(cbb.get(), key));
return base::ToVector(CBBToSpan(cbb.get()));
}
} // namespace crypto::evp
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