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52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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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#ifndef THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SHA2_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SHA2_H_
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#include <stddef.h>
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#include <array>
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#include <string>
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#include "absl/strings/string_view.h"
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#include "absl/types/span.h"
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#include "internal/crypto/crypto_export.h"
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namespace crypto {
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// These functions perform SHA-256 operations.
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//
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// Functions for SHA-384 and SHA-512 can be added when the need arises.
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static const size_t kSHA256Length = 32; // Length in bytes of a SHA-256 hash.
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// Computes the SHA-256 hash of |input|.
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CRYPTO_EXPORT std::array<uint8_t, kSHA256Length> SHA256Hash(
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absl::Span<const uint8_t> input);
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// Convenience version of the above that returns the result in a 32-byte
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// string.
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CRYPTO_EXPORT std::string SHA256HashString(absl::string_view str);
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// Computes the SHA-256 hash of the input string 'str' and stores the first
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// 'len' bytes of the hash in the output buffer 'output'. If 'len' > 32,
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// only 32 bytes (the full hash) are stored in the 'output' buffer.
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CRYPTO_EXPORT void SHA256HashString(absl::string_view str, void* output,
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size_t len);
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} // namespace crypto
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#endif // THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_SHA2_H_
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