| // Copyright 2018 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "tink/subtle/rsa_ssa_pkcs1_verify_boringssl.h" |
| |
| #include <string> |
| #include <utility> |
| |
| #include "absl/status/status.h" |
| #include "absl/strings/str_cat.h" |
| #include "openssl/bn.h" |
| #include "openssl/evp.h" |
| #include "openssl/rsa.h" |
| #include "tink/internal/md_util.h" |
| #include "tink/internal/rsa_util.h" |
| #include "tink/internal/ssl_unique_ptr.h" |
| #include "tink/internal/util.h" |
| #include "tink/subtle/common_enums.h" |
| #include "tink/util/errors.h" |
| #include "tink/util/statusor.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace subtle { |
| |
| util::StatusOr<std::unique_ptr<RsaSsaPkcs1VerifyBoringSsl>> |
| RsaSsaPkcs1VerifyBoringSsl::New(const internal::RsaPublicKey& pub_key, |
| const internal::RsaSsaPkcs1Params& params) { |
| util::Status status = |
| internal::CheckFipsCompatibility<RsaSsaPkcs1VerifyBoringSsl>(); |
| if (!status.ok()) { |
| return status; |
| } |
| |
| // Check if the hash type is safe to use. |
| util::Status is_safe = internal::IsHashTypeSafeForSignature(params.hash_type); |
| if (!is_safe.ok()) { |
| return is_safe; |
| } |
| |
| util::StatusOr<const EVP_MD*> sig_hash = |
| internal::EvpHashFromHashType(params.hash_type); |
| if (!sig_hash.ok()) { |
| return sig_hash.status(); |
| } |
| |
| // The RSA modulus and exponent are checked as part of the conversion to |
| // internal::SslUniquePtr<RSA>. |
| util::StatusOr<internal::SslUniquePtr<RSA>> rsa = |
| internal::RsaPublicKeyToRsa(pub_key); |
| if (!rsa.ok()) { |
| return rsa.status(); |
| } |
| |
| std::unique_ptr<RsaSsaPkcs1VerifyBoringSsl> verify( |
| new RsaSsaPkcs1VerifyBoringSsl(*std::move(rsa), *sig_hash)); |
| return std::move(verify); |
| } |
| |
| util::Status RsaSsaPkcs1VerifyBoringSsl::Verify(absl::string_view signature, |
| absl::string_view data) const { |
| // BoringSSL expects a non-null pointer for data, |
| // regardless of whether the size is 0. |
| data = internal::EnsureStringNonNull(data); |
| |
| util::StatusOr<std::string> digest = internal::ComputeHash(data, *sig_hash_); |
| if (!digest.ok()) { |
| return digest.status(); |
| } |
| |
| if (RSA_verify(EVP_MD_type(sig_hash_), |
| /*digest=*/reinterpret_cast<const uint8_t*>(digest->data()), |
| /*digest_len=*/digest->size(), |
| /*sig=*/reinterpret_cast<const uint8_t*>(signature.data()), |
| /*sig_len=*/signature.length(), |
| /*rsa=*/rsa_.get()) != 1) { |
| // Signature is invalid. |
| return util::Status(absl::StatusCode::kInvalidArgument, |
| "Signature is not valid."); |
| } |
| |
| return util::OkStatus(); |
| } |
| |
| } // namespace subtle |
| } // namespace tink |
| } // namespace crypto |