| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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 "crypto.h" |
| |
| extern "C" { |
| #include <string.h> |
| |
| #include <openssl/mem.h> |
| #include <openssl/sha.h> |
| } // extern "C" |
| |
| namespace nvram { |
| namespace crypto { |
| |
| void SHA256(const uint8_t* data, |
| size_t data_size, |
| uint8_t* digest, |
| size_t digest_size) { |
| // SHA256 requires an output buffer of at least SHA256_DIGEST_LENGTH. |
| // |digest_size| might be less, so store the digest in a local buffer. |
| uint8_t buffer[SHA256_DIGEST_LENGTH]; |
| ::SHA256(data, data_size, buffer); |
| |
| // Copy the result to |digest|. |
| if (digest_size < sizeof(buffer)) { |
| memcpy(digest, buffer, digest_size); |
| } else { |
| memcpy(digest, buffer, sizeof(buffer)); |
| memset(digest + sizeof(buffer), 0, digest_size - sizeof(buffer)); |
| } |
| } |
| |
| } // namespace crypto |
| } // namespace nvram |