mirror of
https://github.com/RGBCube/serenity
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74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Ali Mohammad Pur <ali.mpfard@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <LibCrypto/ASN1/ASN1.h>
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#include <LibCrypto/ASN1/DER.h>
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namespace Crypto {
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static ByteBuffer decode_pem(const ByteBuffer& data_in, size_t cert_index = 0)
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{
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size_t i { 0 };
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size_t start_at { 0 };
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size_t idx { 0 };
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size_t input_length = data_in.size();
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auto alloc_len = input_length / 4 * 3;
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auto output = ByteBuffer::create_uninitialized(alloc_len);
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for (i = 0; i < input_length; i++) {
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if ((data_in[i] == '\n') || (data_in[i] == '\r'))
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continue;
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if (data_in[i] != '-') {
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// read entire line
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while ((i < input_length) && (data_in[i] != '\n'))
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i++;
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continue;
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}
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if (data_in[i] == '-') {
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auto end_idx = i;
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//read until end of line
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while ((i < input_length) && (data_in[i] != '\n'))
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i++;
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if (start_at) {
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if (cert_index > 0) {
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cert_index--;
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start_at = 0;
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} else {
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idx = decode_b64(data_in.offset_pointer(start_at), end_idx - start_at, output);
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break;
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}
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} else
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start_at = i + 1;
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}
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}
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return output.slice(0, idx);
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}
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}
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