/*
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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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