1*e7b1675dSTing-Kang Chang // Copyright 2017 Google Inc. 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 17*e7b1675dSTing-Kang Chang #ifndef TINK_SUBTLE_EC_UTIL_H_ 18*e7b1675dSTing-Kang Chang #define TINK_SUBTLE_EC_UTIL_H_ 19*e7b1675dSTing-Kang Chang 20*e7b1675dSTing-Kang Chang #include "absl/base/macros.h" 21*e7b1675dSTing-Kang Chang #include "tink/internal/ec_util.h" 22*e7b1675dSTing-Kang Chang #include "tink/subtle/common_enums.h" 23*e7b1675dSTing-Kang Chang #include "tink/util/status.h" 24*e7b1675dSTing-Kang Chang #include "tink/util/statusor.h" 25*e7b1675dSTing-Kang Chang 26*e7b1675dSTing-Kang Chang namespace crypto { 27*e7b1675dSTing-Kang Chang namespace tink { 28*e7b1675dSTing-Kang Chang namespace subtle { 29*e7b1675dSTing-Kang Chang 30*e7b1675dSTing-Kang Chang class EcUtil { 31*e7b1675dSTing-Kang Chang public: 32*e7b1675dSTing-Kang Chang // Returns the encoding size of a point on the specified elliptic curve 33*e7b1675dSTing-Kang Chang // when the given 'point_format' is used. 34*e7b1675dSTing-Kang Chang ABSL_DEPRECATED("Use of this function is dicouraged outside Tink.") EncodingSizeInBytes(EllipticCurveType curve_type,EcPointFormat point_format)35*e7b1675dSTing-Kang Chang static inline crypto::tink::util::StatusOr<uint32_t> EncodingSizeInBytes( 36*e7b1675dSTing-Kang Chang EllipticCurveType curve_type, EcPointFormat point_format) { 37*e7b1675dSTing-Kang Chang return internal::EcPointEncodingSizeInBytes(curve_type, point_format); 38*e7b1675dSTing-Kang Chang } 39*e7b1675dSTing-Kang Chang 40*e7b1675dSTing-Kang Chang // Returns the size (in bytes) of an element of the field over which 41*e7b1675dSTing-Kang Chang // the curve is defined. 42*e7b1675dSTing-Kang Chang ABSL_DEPRECATED("Use of this function is dicouraged outside Tink.") FieldSizeInBytes(EllipticCurveType curve_type)43*e7b1675dSTing-Kang Chang static inline uint32_t FieldSizeInBytes(EllipticCurveType curve_type) { 44*e7b1675dSTing-Kang Chang util::StatusOr<int32_t> size = internal::EcFieldSizeInBytes(curve_type); 45*e7b1675dSTing-Kang Chang if (!size.ok()) { 46*e7b1675dSTing-Kang Chang return 0; 47*e7b1675dSTing-Kang Chang } 48*e7b1675dSTing-Kang Chang return *size; 49*e7b1675dSTing-Kang Chang } 50*e7b1675dSTing-Kang Chang }; 51*e7b1675dSTing-Kang Chang 52*e7b1675dSTing-Kang Chang } // namespace subtle 53*e7b1675dSTing-Kang Chang } // namespace tink 54*e7b1675dSTing-Kang Chang } // namespace crypto 55*e7b1675dSTing-Kang Chang 56*e7b1675dSTing-Kang Chang #endif // TINK_SUBTLE_EC_UTIL_H_ 57