xref: /aosp_15_r20/external/tink/cc/subtle/xchacha20_poly1305_boringssl.h (revision e7b1675dde1b92d52ec075b0a92829627f2c52a5)
1 // Copyright 2018 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_XCHACHA20_POLY1305_BORINGSSL_H_
18 #define TINK_SUBTLE_XCHACHA20_POLY1305_BORINGSSL_H_
19 
20 #include <memory>
21 #include <string>
22 #include <utility>
23 
24 #include "absl/strings/string_view.h"
25 #include "tink/aead.h"
26 #include "tink/aead/internal/ssl_aead.h"
27 #include "tink/internal/fips_utils.h"
28 #include "tink/util/secret_data.h"
29 #include "tink/util/status.h"
30 #include "tink/util/statusor.h"
31 
32 namespace crypto {
33 namespace tink {
34 namespace subtle {
35 
36 class XChacha20Poly1305BoringSsl : public Aead {
37  public:
38   // Constructs a new Aead cipher for XChacha20-Poly1305.
39   // Currently supported key size is 256 bits.
40   // Currently supported nonce size is 24 bytes.
41   // The tag size is fixed to 16 bytes.
42   static crypto::tink::util::StatusOr<std::unique_ptr<Aead>> New(
43       util::SecretData key);
44 
45   crypto::tink::util::StatusOr<std::string> Encrypt(
46       absl::string_view plaintext,
47       absl::string_view associated_data) const override;
48 
49   crypto::tink::util::StatusOr<std::string> Decrypt(
50       absl::string_view ciphertext,
51       absl::string_view associated_data) const override;
52 
53   static constexpr crypto::tink::internal::FipsCompatibility kFipsStatus =
54       crypto::tink::internal::FipsCompatibility::kNotFips;
55 
56  private:
XChacha20Poly1305BoringSsl(std::unique_ptr<internal::SslOneShotAead> aead)57   explicit XChacha20Poly1305BoringSsl(
58       std::unique_ptr<internal::SslOneShotAead> aead)
59       : aead_(std::move(aead)) {}
60 
61   const std::unique_ptr<internal::SslOneShotAead> aead_;
62 };
63 
64 }  // namespace subtle
65 }  // namespace tink
66 }  // namespace crypto
67 
68 #endif  // TINK_SUBTLE_XCHACHA20_POLY1305_BORINGSSL_H_
69