50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/*
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* Copyright 2015 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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#ifndef SYSTEM_KEYMASTER_HKDF_H_
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#define SYSTEM_KEYMASTER_HKDF_H_
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#include "kdf.h"
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#include <keymaster/serializable.h>
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#include <keymaster/UniquePtr.h>
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namespace keymaster {
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/**
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* Rfc5869Sha256Kdf implements the key derivation function specified in RFC 5869 (using SHA256) and
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* outputs key material, as needed by ECIES. See https://tools.ietf.org/html/rfc5869 for details.
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*/
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class Rfc5869Sha256Kdf : public Kdf {
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public:
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~Rfc5869Sha256Kdf() {}
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bool Init(Buffer& secret, Buffer& salt) {
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return Init(secret.peek_read(), secret.available_read(), salt.peek_read(),
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salt.available_read());
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}
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bool Init(const uint8_t* secret, size_t secret_len, const uint8_t* salt, size_t salt_len) {
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return Kdf::Init(KM_DIGEST_SHA_2_256, secret, secret_len, salt, salt_len);
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}
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bool GenerateKey(const uint8_t* info, size_t info_len, uint8_t* output,
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size_t output_len) override;
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};
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} // namespace keymaster
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#endif // SYSTEM_KEYMASTER_HKDF_H_
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