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50 lines
1.5 KiB
C++
50 lines
1.5 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_RANDOM_H_
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#define THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_RANDOM_H_
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#include <stddef.h>
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#include <string>
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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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// Fills the given buffer with |length| random bytes of cryptographically
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// secure random numbers.
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// |length| must be positive.
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CRYPTO_EXPORT void RandBytes(void *bytes, size_t length);
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// Fills |bytes| with cryptographically-secure random bits.
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CRYPTO_EXPORT void RandBytes(absl::Span<uint8_t> bytes);
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// Returns |length| random bytes.
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CRYPTO_EXPORT std::string RandBytes(size_t length);
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// Creates an object of type T initialized with random data.
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// This template should be used for simple data types: int, char, etc.
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template <typename T>
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T RandData() {
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T data;
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RandBytes(&data, sizeof(data));
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return data;
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}
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} // namespace crypto
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#endif // THIRD_PARTY_NEARBY_INTERNAL_CRYPTO_RANDOM_H_
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