xref: /aosp_15_r20/external/tink/cc/subtle/ec_util.h (revision e7b1675dde1b92d52ec075b0a92829627f2c52a5)
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_
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