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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Base64.h>
#include <AK/GenericLexer.h>
#include <LibCrypto/ASN1/PEM.h>
namespace Crypto {
ByteBuffer decode_pem(ReadonlyBytes data)
{
GenericLexer lexer { data };
ByteBuffer decoded;
// FIXME: Parse multiple.
enum {
PreStartData,
Started,
Ended,
} state { PreStartData };
while (!lexer.is_eof()) {
switch (state) {
case PreStartData:
if (lexer.consume_specific("-----BEGIN"))
state = Started;
lexer.consume_line();
break;
case Started: {
if (lexer.consume_specific("-----END")) {
state = Ended;
lexer.consume_line();
break;
}
auto b64decoded = decode_base64(lexer.consume_line().trim_whitespace(TrimMode::Right));
if (!b64decoded.has_value()) {
dbgln("Failed to decode PEM, likely bad Base64");
return {};
}
if (!decoded.try_append(b64decoded.value().data(), b64decoded.value().size())) {
dbgln("Failed to decode PEM, likely OOM condition");
return {};
}
break;
}
case Ended:
lexer.consume_all();
break;
default:
VERIFY_NOT_REACHED();
}
}
return decoded;
}
}
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