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48 lines
1.4 KiB
48 lines
1.4 KiB
/* |
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* Copyright (C) 2016 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#include "crypto.h" |
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extern "C" { |
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#include <string.h> |
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#include <openssl/mem.h> |
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#include <openssl/sha.h> |
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} // extern "C" |
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namespace nvram { |
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namespace crypto { |
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void SHA256(const uint8_t* data, |
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size_t data_size, |
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uint8_t* digest, |
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size_t digest_size) { |
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// SHA256 requires an output buffer of at least SHA256_DIGEST_LENGTH. |
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// |digest_size| might be less, so store the digest in a local buffer. |
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uint8_t buffer[SHA256_DIGEST_LENGTH]; |
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::SHA256(data, data_size, buffer); |
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// Copy the result to |digest|. |
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if (digest_size < sizeof(buffer)) { |
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memcpy(digest, buffer, digest_size); |
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} else { |
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memcpy(digest, buffer, sizeof(buffer)); |
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memset(digest + sizeof(buffer), 0, digest_size - sizeof(buffer)); |
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} |
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} |
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} // namespace crypto |
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} // namespace nvram
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