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