1 // Copyright 2017 Google Inc. 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 17 #ifndef TINK_SUBTLE_EC_UTIL_H_ 18 #define TINK_SUBTLE_EC_UTIL_H_ 19 20 #include "absl/base/macros.h" 21 #include "tink/internal/ec_util.h" 22 #include "tink/subtle/common_enums.h" 23 #include "tink/util/status.h" 24 #include "tink/util/statusor.h" 25 26 namespace crypto { 27 namespace tink { 28 namespace subtle { 29 30 class EcUtil { 31 public: 32 // Returns the encoding size of a point on the specified elliptic curve 33 // when the given 'point_format' is used. 34 ABSL_DEPRECATED("Use of this function is dicouraged outside Tink.") EncodingSizeInBytes(EllipticCurveType curve_type,EcPointFormat point_format)35 static inline crypto::tink::util::StatusOr<uint32_t> EncodingSizeInBytes( 36 EllipticCurveType curve_type, EcPointFormat point_format) { 37 return internal::EcPointEncodingSizeInBytes(curve_type, point_format); 38 } 39 40 // Returns the size (in bytes) of an element of the field over which 41 // the curve is defined. 42 ABSL_DEPRECATED("Use of this function is dicouraged outside Tink.") FieldSizeInBytes(EllipticCurveType curve_type)43 static inline uint32_t FieldSizeInBytes(EllipticCurveType curve_type) { 44 util::StatusOr<int32_t> size = internal::EcFieldSizeInBytes(curve_type); 45 if (!size.ok()) { 46 return 0; 47 } 48 return *size; 49 } 50 }; 51 52 } // namespace subtle 53 } // namespace tink 54 } // namespace crypto 55 56 #endif // TINK_SUBTLE_EC_UTIL_H_ 57