82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
/*
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* Copyright 2014 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 <openssl/rsa.h>
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#include <openssl/evp.h>
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#include "rsa_operation.h"
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#include "openssl_utils.h"
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namespace keymaster {
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struct RSA_Delete {
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void operator()(RSA* p) const { RSA_free(p); }
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};
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RsaOperation::~RsaOperation() {
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if (rsa_key_ != NULL)
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RSA_free(rsa_key_);
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}
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keymaster_error_t RsaOperation::Update(const Buffer& input, Buffer* /* output */) {
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switch (purpose()) {
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default:
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return KM_ERROR_UNIMPLEMENTED;
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case KM_PURPOSE_SIGN:
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case KM_PURPOSE_VERIFY:
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return StoreData(input);
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}
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}
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keymaster_error_t RsaOperation::StoreData(const Buffer& input) {
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if (!data_.reserve(data_.available_read() + input.available_read()) ||
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!data_.write(input.peek_read(), input.available_read()))
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return KM_ERROR_MEMORY_ALLOCATION_FAILED;
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return KM_ERROR_OK;
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}
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keymaster_error_t RsaSignOperation::Finish(const Buffer& /* signature */, Buffer* output) {
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output->Reinitialize(RSA_size(rsa_key_));
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int bytes_encrypted = RSA_private_encrypt(data_.available_read(), data_.peek_read(),
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output->peek_write(), rsa_key_, RSA_NO_PADDING);
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if (bytes_encrypted < 0)
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return KM_ERROR_UNKNOWN_ERROR;
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assert(bytes_encrypted == RSA_size(rsa_key_));
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output->advance_write(bytes_encrypted);
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return KM_ERROR_OK;
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}
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keymaster_error_t RsaVerifyOperation::Finish(const Buffer& signature, Buffer* /* output */) {
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if ((int)data_.available_read() != RSA_size(rsa_key_))
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return KM_ERROR_INVALID_INPUT_LENGTH;
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if (data_.available_read() != signature.available_read())
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return KM_ERROR_VERIFICATION_FAILED;
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UniquePtr<uint8_t[]> decrypted_data(new uint8_t[RSA_size(rsa_key_)]);
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int bytes_decrypted = RSA_public_decrypt(signature.available_read(), signature.peek_read(),
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decrypted_data.get(), rsa_key_, RSA_NO_PADDING);
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if (bytes_decrypted < 0)
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return KM_ERROR_UNKNOWN_ERROR;
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assert(bytes_decrypted == RSA_size(rsa_key_));
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if (memcmp_s(decrypted_data.get(), data_.peek_read(), data_.available_read()) == 0)
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return KM_ERROR_OK;
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return KM_ERROR_VERIFICATION_FAILED;
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}
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} // namespace keymaster
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