1*e7b1675dSTing-Kang Chang // Copyright 2021 Google LLC 2*e7b1675dSTing-Kang Chang // 3*e7b1675dSTing-Kang Chang // Licensed under the Apache License, Version 2.0 (the "License"); 4*e7b1675dSTing-Kang Chang // you may not use this file except in compliance with the License. 5*e7b1675dSTing-Kang Chang // You may obtain a copy of the License at 6*e7b1675dSTing-Kang Chang // 7*e7b1675dSTing-Kang Chang // http://www.apache.org/licenses/LICENSE-2.0 8*e7b1675dSTing-Kang Chang // 9*e7b1675dSTing-Kang Chang // Unless required by applicable law or agreed to in writing, software 10*e7b1675dSTing-Kang Chang // distributed under the License is distributed on an "AS IS" BASIS, 11*e7b1675dSTing-Kang Chang // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*e7b1675dSTing-Kang Chang // See the License for the specific language governing permissions and 13*e7b1675dSTing-Kang Chang // limitations under the License. 14*e7b1675dSTing-Kang Chang // 15*e7b1675dSTing-Kang Chang /////////////////////////////////////////////////////////////////////////////// 16*e7b1675dSTing-Kang Chang #ifndef TINK_INTERNAL_MD_UTIL_H_ 17*e7b1675dSTing-Kang Chang #define TINK_INTERNAL_MD_UTIL_H_ 18*e7b1675dSTing-Kang Chang 19*e7b1675dSTing-Kang Chang #include <string> 20*e7b1675dSTing-Kang Chang #include <vector> 21*e7b1675dSTing-Kang Chang 22*e7b1675dSTing-Kang Chang #include "absl/strings/string_view.h" 23*e7b1675dSTing-Kang Chang #include "openssl/evp.h" 24*e7b1675dSTing-Kang Chang #include "tink/subtle/common_enums.h" 25*e7b1675dSTing-Kang Chang #include "tink/util/status.h" 26*e7b1675dSTing-Kang Chang #include "tink/util/statusor.h" 27*e7b1675dSTing-Kang Chang 28*e7b1675dSTing-Kang Chang namespace crypto { 29*e7b1675dSTing-Kang Chang namespace tink { 30*e7b1675dSTing-Kang Chang namespace internal { 31*e7b1675dSTing-Kang Chang 32*e7b1675dSTing-Kang Chang // Returns an EVP structure for a hash function type `hash_type`. 33*e7b1675dSTing-Kang Chang // Note: EVP_MD instances are sigletons owned by BoringSSL/OpenSSL. 34*e7b1675dSTing-Kang Chang util::StatusOr<const EVP_MD *> EvpHashFromHashType( 35*e7b1675dSTing-Kang Chang crypto::tink::subtle::HashType hash_type); 36*e7b1675dSTing-Kang Chang 37*e7b1675dSTing-Kang Chang // Validates whether `sig_hash` is safe to use for digital signature. 38*e7b1675dSTing-Kang Chang crypto::tink::util::Status IsHashTypeSafeForSignature( 39*e7b1675dSTing-Kang Chang crypto::tink::subtle::HashType sig_hash); 40*e7b1675dSTing-Kang Chang 41*e7b1675dSTing-Kang Chang // Returns the hash of `input` using the hash function `hasher`. 42*e7b1675dSTing-Kang Chang crypto::tink::util::StatusOr<std::string> ComputeHash(absl::string_view input, 43*e7b1675dSTing-Kang Chang const EVP_MD &hasher); 44*e7b1675dSTing-Kang Chang 45*e7b1675dSTing-Kang Chang } // namespace internal 46*e7b1675dSTing-Kang Chang } // namespace tink 47*e7b1675dSTing-Kang Chang } // namespace crypto 48*e7b1675dSTing-Kang Chang 49*e7b1675dSTing-Kang Chang #endif // TINK_INTERNAL_MD_UTIL_H_ 50