mirror of
https://github.com/RGBCube/serenity
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3fe7ac0924
And use it to parse RSA keys. As a bonus, this one shouldn't be reading out of bounds or messing with the stack (as much) anymore.
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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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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#include <AK/Base64.h>
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#include <AK/GenericLexer.h>
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#include <LibCrypto/ASN1/PEM.h>
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namespace Crypto {
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ByteBuffer decode_pem(ReadonlyBytes data)
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{
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GenericLexer lexer { data };
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ByteBuffer decoded;
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// FIXME: Parse multiple.
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enum {
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PreStartData,
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Started,
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Ended,
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} state { PreStartData };
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while (!lexer.is_eof()) {
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switch (state) {
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case PreStartData:
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if (lexer.consume_specific("-----BEGIN"))
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state = Started;
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lexer.consume_line();
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break;
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case Started: {
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if (lexer.consume_specific("-----END")) {
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state = Ended;
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lexer.consume_line();
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break;
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}
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auto b64decoded = decode_base64(lexer.consume_line().trim_whitespace(TrimMode::Right));
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decoded.append(b64decoded.data(), b64decoded.size());
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break;
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}
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case Ended:
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lexer.consume_all();
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break;
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default:
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ASSERT_NOT_REACHED();
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}
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}
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return decoded;
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}
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}
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