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LibWeb: Implement X25519.generateKey

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stelar7 2024-10-26 20:12:09 +02:00 • committed by Andreas Kling
commit 944f00c489
Notes: github-actions[bot] 2024-10-31 08:53:45 +00:00
3 changed files with 74 additions and 1 deletions
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70
Userland/Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2024, Andrew Kaster <akaster@serenityos.org>
* Copyright (c) 2024, stelar7 <dudedbz@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -2394,4 +2395,73 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::ArrayBuffer>> X25519::derive_bits(Algor
return JS::ArrayBuffer::create(realm, move(result));
}
WebIDL::ExceptionOr<Variant<JS::NonnullGCPtr<CryptoKey>, JS::NonnullGCPtr<CryptoKeyPair>>> X25519::generate_key([[maybe_unused]] AlgorithmParams const& params, bool extractable, Vector<Bindings::KeyUsage> const& key_usages)
{
// 1. If usages contains an entry which is not "deriveKey" or "deriveBits" then throw a SyntaxError.
for (auto const& usage : key_usages) {
if (usage != Bindings::KeyUsage::Derivekey && usage != Bindings::KeyUsage::Derivebits) {
return WebIDL::SyntaxError::create(m_realm, MUST(String::formatted("Invalid key usage '{}'", idl_enum_to_string(usage))));
}
}
// 2. Generate an X25519 key pair, with the private key being 32 random bytes,
// and the public key being X25519(a, 9), as defined in [RFC7748], section 6.1.
::Crypto::Curves::X25519 curve;
auto maybe_private_key = curve.generate_private_key();
if (maybe_private_key.is_error())
return WebIDL::OperationError::create(m_realm, "Failed to generate private key"_string);
auto private_key_data = maybe_private_key.release_value();
auto maybe_public_key = curve.generate_public_key(private_key_data);
if (maybe_public_key.is_error())
return WebIDL::OperationError::create(m_realm, "Failed to generate public key"_string);
auto public_key_data = maybe_public_key.release_value();
// 3. Let algorithm be a new KeyAlgorithm object.
auto algorithm = KeyAlgorithm::create(m_realm);
// 4. Set the name attribute of algorithm to "X25519".
algorithm->set_name("X25519"_string);
// 5. Let publicKey be a new CryptoKey associated with the relevant global object of this [HTML],
// and representing the public key of the generated key pair.
auto public_key = CryptoKey::create(m_realm, CryptoKey::InternalKeyData { public_key_data });
// 6. Set the [[type]] internal slot of publicKey to "public"
public_key->set_type(Bindings::KeyType::Public);
// 7. Set the [[algorithm]] internal slot of publicKey to algorithm.
public_key->set_algorithm(algorithm);
// 8. Set the [[extractable]] internal slot of publicKey to true.
public_key->set_extractable(true);
// 9. Set the [[usages]] internal slot of publicKey to be the empty list.
public_key->set_usages({});
// 10. Let privateKey be a new CryptoKey associated with the relevant global object of this [HTML],
// and representing the private key of the generated key pair.
auto private_key = CryptoKey::create(m_realm, CryptoKey::InternalKeyData { private_key_data });
// 11. Set the [[type]] internal slot of privateKey to "private"
private_key->set_type(Bindings::KeyType::Private);
// 12. Set the [[algorithm]] internal slot of privateKey to algorithm.
private_key->set_algorithm(algorithm);
// 13. Set the [[extractable]] internal slot of privateKey to extractable.
private_key->set_extractable(extractable);
// 14. Set the [[usages]] internal slot of privateKey to be the usage intersection of usages and [ "deriveKey", "deriveBits" ].
private_key->set_usages(usage_intersection(key_usages, { { Bindings::KeyUsage::Derivekey, Bindings::KeyUsage::Derivebits } }));
// 15. Let result be a new CryptoKeyPair dictionary.
// 16. Set the publicKey attribute of result to be publicKey.
// 17. Set the privateKey attribute of result to be privateKey.
// 18. Return the result of converting result to an ECMAScript Object, as defined by [WebIDL].
return Variant<JS::NonnullGCPtr<CryptoKey>, JS::NonnullGCPtr<CryptoKeyPair>> { CryptoKeyPair::create(m_realm, public_key, private_key) };
}
}