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LibCrypto: Add PEM encoder

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This commit adds a new method to create a PEM encoded ASN1 from
its DER variant.
This commit is contained in:
Fabian Dellwing 2023-04-01 21:20:29 +02:00 • committed by Andrew Kaster
parent 7ce75ee3c5
commit 8b881eaf02
2 changed files with 42 additions and 0 deletions
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36
Userland/Libraries/LibCrypto/ASN1/PEM.cpp
View file

@ -93,4 +93,40 @@ ErrorOr<Vector<ByteBuffer>> decode_pems(ReadonlyBytes data)
return pems;
}
ErrorOr<ByteBuffer> encode_pem(ReadonlyBytes data, PEMType type)
{
ByteBuffer encoded;
StringView block_start;
StringView block_end;
switch (type) {
case Certificate:
block_start = "-----BEGIN CERTIFICATE-----\n"sv;
block_end = "-----END CERTIFICATE-----\n"sv;
break;
case PrivateKey:
block_start = "-----BEGIN PRIVATE KEY-----\n"sv;
block_end = "-----END PRIVATE KEY-----\n"sv;
break;
default:
VERIFY_NOT_REACHED();
}
auto b64encoded = TRY(encode_base64(data));
TRY(encoded.try_append(block_start.bytes()));
size_t to_read = 64;
for (size_t i = 0; i < b64encoded.bytes().size(); i += to_read) {
if (i + to_read > b64encoded.bytes().size())
to_read = b64encoded.bytes().size() - i;
TRY(encoded.try_append(b64encoded.bytes().slice(i, to_read)));
TRY(encoded.try_append("\n"sv.bytes()));
}
TRY(encoded.try_append(block_end.bytes()));
return encoded;
}
}

6
Userland/Libraries/LibCrypto/ASN1/PEM.h
View file

@ -12,7 +12,13 @@
namespace Crypto {
enum PEMType {
Certificate,
PrivateKey,
};
ByteBuffer decode_pem(ReadonlyBytes);
ErrorOr<Vector<ByteBuffer>> decode_pems(ReadonlyBytes);
ErrorOr<ByteBuffer> encode_pem(ReadonlyBytes, PEMType = PEMType::Certificate);
}