/*
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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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#include <keymaster/km_openssl/kdf.h>
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namespace keymaster {
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Kdf::Kdf() : is_initialized_(false) {}
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bool Kdf::Init(keymaster_digest_t digest_type, const uint8_t* secret, size_t secret_len,
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const uint8_t* salt, size_t salt_len) {
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is_initialized_ = false;
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switch (digest_type) {
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case KM_DIGEST_SHA1:
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digest_size_ = 20;
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digest_type_ = digest_type;
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break;
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case KM_DIGEST_SHA_2_256:
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digest_size_ = 32;
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digest_type_ = digest_type;
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break;
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default:
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return false;
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}
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if (!secret || secret_len == 0)
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return false;
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secret_key_len_ = secret_len;
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secret_key_.reset(dup_buffer(secret, secret_len));
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if (!secret_key_.get())
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return false;
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salt_len_ = salt_len;
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if (salt && salt_len > 0) {
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salt_.reset(dup_buffer(salt, salt_len));
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if (!salt_.get())
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return false;
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} else {
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salt_.reset();
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}
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is_initialized_ = true;
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return true;
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}
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bool Kdf::Uint32ToBigEndianByteArray(uint32_t number, uint8_t* output) {
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if (!output)
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return false;
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output[0] = (number >> 24) & 0xff;
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output[1] = (number >> 16) & 0xff;
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output[2] = (number >> 8) & 0xff;
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output[3] = (number)&0xff;
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return true;
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}
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} // namespace keymaster
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