1 // Copyright 2021 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 /////////////////////////////////////////////////////////////////////////////// 16 #ifndef TINK_INTERNAL_MD_UTIL_H_ 17 #define TINK_INTERNAL_MD_UTIL_H_ 18 19 #include <string> 20 #include <vector> 21 22 #include "absl/strings/string_view.h" 23 #include "openssl/evp.h" 24 #include "tink/subtle/common_enums.h" 25 #include "tink/util/status.h" 26 #include "tink/util/statusor.h" 27 28 namespace crypto { 29 namespace tink { 30 namespace internal { 31 32 // Returns an EVP structure for a hash function type `hash_type`. 33 // Note: EVP_MD instances are sigletons owned by BoringSSL/OpenSSL. 34 util::StatusOr<const EVP_MD *> EvpHashFromHashType( 35 crypto::tink::subtle::HashType hash_type); 36 37 // Validates whether `sig_hash` is safe to use for digital signature. 38 crypto::tink::util::Status IsHashTypeSafeForSignature( 39 crypto::tink::subtle::HashType sig_hash); 40 41 // Returns the hash of `input` using the hash function `hasher`. 42 crypto::tink::util::StatusOr<std::string> ComputeHash(absl::string_view input, 43 const EVP_MD &hasher); 44 45 } // namespace internal 46 } // namespace tink 47 } // namespace crypto 48 49 #endif // TINK_INTERNAL_MD_UTIL_H_ 50