| // Copyright 2021 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| #include "tink/aead/internal/aead_util.h" |
| |
| #include "absl/status/status.h" |
| #include "openssl/evp.h" |
| #include "tink/util/errors.h" |
| #include "tink/util/statusor.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace internal { |
| |
| util::StatusOr<const EVP_CIPHER *> GetAesGcmCipherForKeySize( |
| uint32_t key_size_in_bytes) { |
| switch (key_size_in_bytes) { |
| case 16: |
| return EVP_aes_128_gcm(); |
| case 32: |
| return EVP_aes_256_gcm(); |
| default: |
| return ToStatusF(absl::StatusCode::kInvalidArgument, |
| "Invalid key size %d", key_size_in_bytes); |
| } |
| } |
| |
| #ifdef OPENSSL_IS_BORINGSSL |
| util::StatusOr<const EVP_AEAD *> GetAesGcmAeadForKeySize( |
| uint32_t key_size_in_bytes) { |
| switch (key_size_in_bytes) { |
| case 16: |
| return EVP_aead_aes_128_gcm(); |
| case 32: |
| return EVP_aead_aes_256_gcm(); |
| default: |
| return ToStatusF(absl::StatusCode::kInvalidArgument, |
| "Invalid key size %d", key_size_in_bytes); |
| } |
| } |
| |
| util::StatusOr<const EVP_AEAD *> GetAesGcmSivAeadCipherForKeySize( |
| int key_size_in_bytes) { |
| switch (key_size_in_bytes) { |
| case 16: |
| return EVP_aead_aes_128_gcm_siv(); |
| case 32: |
| return EVP_aead_aes_256_gcm_siv(); |
| default: |
| return ToStatusF( |
| absl::StatusCode::kInvalidArgument, |
| "Invalid key size; valid values are {16, 32} bytes, got %d", |
| key_size_in_bytes); |
| } |
| } |
| #endif |
| |
| } // namespace internal |
| } // namespace tink |
| } // namespace crypto |