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LibCrypto: Add roundtrip test for parsing RSA private keys

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stelar7 2024-03-22 10:17:31 +01:00 committed by Andrew Kaster
parent 1be411cc73
commit 0359e8848a
Notes: sideshowbarker 2024-07-16 23:23:26 +09:00 
Author: https://github.com/stelar7
Commit: https://github.com/SerenityOS/serenity/commit/0359e8848a
Pull-request: https://github.com/SerenityOS/serenity/pull/23674
Issue: https://github.com/SerenityOS/serenity/issues/23657
Reviewed-by: https://github.com/ADKaster ✅
2 changed files with 38 additions and 2 deletions
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10
Tests/LibCrypto/TestRSA.cpp
View file

@ -6,6 +6,7 @@
#include <LibCrypto/ASN1/PEM.h>
#include <LibCrypto/Hash/SHA2.h>
#include <LibCrypto/PK/PK.h>
#include <LibCrypto/PK/RSA.h>
#include <LibTest/TestCase.h>
#include <cstring>
@ -119,14 +120,19 @@ sV/ETwIDAQABAkBpC37UJkjWQRHyxP83xuasExuO6/mT5sQN692kcppTJ9wHNWoD
RwIhAIDSm8Ajgf7m3RQEoLVrCe/l8WtCqsuWliOsr6rbQq4hAiEAx8R16wvOtZlN
W4jvSU1+WwAaBZl21lfKf8OhLRXrmNkCIG9IRdcSiNR/Ut8QfD3N9Bb1HsUm+Bvz
c8yGzl89pYST
-----END PRIVATE KEY-----)"sv;
-----END PRIVATE KEY-----
)"sv;
auto decoded = Crypto::decode_pem(keypem.bytes());
auto keypair = Crypto::PK::RSA::parse_rsa_key(decoded);
auto priv_der = MUST(keypair.private_key.export_as_der());
auto priv_pem = MUST(Crypto::encode_pem(priv_der, Crypto::PEMType::PrivateKey));
auto rsa_encryption_oid = Array<int, 7> { 1, 2, 840, 113549, 1, 1, 1 };
auto wrapped_priv_der = MUST(Crypto::PK::wrap_in_private_key_info(keypair.private_key, rsa_encryption_oid));
auto priv_pem = MUST(Crypto::encode_pem(wrapped_priv_der, Crypto::PEMType::PrivateKey));
auto rsa_from_pair = Crypto::PK::RSA(keypair.public_key, keypair.private_key);
auto rsa_from_pem = Crypto::PK::RSA(priv_pem);
EXPECT_EQ(keypem, StringView(priv_pem));
u8 enc_buffer[rsa_from_pair.output_size()];
u8 dec_buffer[rsa_from_pair.output_size()];

30
Userland/Libraries/LibCrypto/PK/PK.h
View file

@ -14,6 +14,36 @@
namespace Crypto::PK {
template<typename ExportableKey>
ErrorOr<ByteBuffer> wrap_in_private_key_info(ExportableKey key, Span<int> algorithm_identifier)
requires requires(ExportableKey k) {
k.export_as_der();
}
{
ASN1::Encoder encoder;
TRY(encoder.write_constructed(ASN1::Class::Universal, ASN1::Kind::Sequence, [&]() -> ErrorOr<void> {
TRY(encoder.write(0x00u)); // version
// AlgorithmIdentifier
TRY(encoder.write_constructed(ASN1::Class::Universal, ASN1::Kind::Sequence, [&]() -> ErrorOr<void> {
TRY(encoder.write(algorithm_identifier)); // algorithm
// FIXME: This assumes we have a NULL parameter, this is not always the case
TRY(encoder.write(nullptr)); // parameters
return {};
}));
// PrivateKey
auto data = TRY(key.export_as_der());
TRY(encoder.write(data));
return {};
}));
return encoder.finish();
}
// FIXME: Fixing name up for grabs
template<typename PrivKeyT, typename PubKeyT>
class PKSystem {