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LibCrypto+LibWeb: Replace RSA_OAEP-EME implementation

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This replaces the old `OAEP` implementation with one backed by OpenSSL.
The changes also include some added modularity to the RSA class by
making the `RSA_EME` and `RSA_EMSE` for encryption/decryption and
signing/verifying respectively.
This commit is contained in:
devgianlu 2024-12-25 22:40:50 +01:00 • committed by Ali Mohammad Pur
parent 70bc26e32a
commit a59b48cffc
Notes: github-actions[bot] 2025-01-13 16:01:20 +00:00
3 changed files with 60 additions and 238 deletions
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74
Libraries/LibWeb/Crypto/CryptoAlgorithms.cpp
View file

@ -29,7 +29,6 @@
#include <LibCrypto/Hash/SHA1.h>
#include <LibCrypto/Hash/SHA2.h>
#include <LibCrypto/PK/RSA.h>
#include <LibCrypto/Padding/OAEP.h>
#include <LibCrypto/SecureRandom.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/ArrayBuffer.h>
@ -665,30 +664,27 @@ WebIDL::ExceptionOr<GC::Ref<JS::ArrayBuffer>> RSAOAEP::encrypt(AlgorithmParams c
// 3. Perform the encryption operation defined in Section 7.1 of [RFC3447] with the key represented by key as the recipient's RSA public key,
// the contents of plaintext as the message to be encrypted, M and label as the label, L, and with the hash function specified by the hash attribute
// of the [[algorithm]] internal slot of key as the Hash option and MGF1 (defined in Section B.2.1 of [RFC3447]) as the MGF option.
auto error_message = MUST(String::formatted("Invalid hash function '{}'", hash));
ErrorOr<ByteBuffer> maybe_padding = Error::from_string_view(error_message.bytes_as_string_view());
if (hash == "SHA-1") {
maybe_padding = ::Crypto::Padding::OAEP::eme_encode<::Crypto::Hash::SHA1, ::Crypto::Hash::MGF>(plaintext, label, public_key.length());
} else if (hash == "SHA-256") {
maybe_padding = ::Crypto::Padding::OAEP::eme_encode<::Crypto::Hash::SHA256, ::Crypto::Hash::MGF>(plaintext, label, public_key.length());
} else if (hash == "SHA-384") {
maybe_padding = ::Crypto::Padding::OAEP::eme_encode<::Crypto::Hash::SHA384, ::Crypto::Hash::MGF>(plaintext, label, public_key.length());
} else if (hash == "SHA-512") {
maybe_padding = ::Crypto::Padding::OAEP::eme_encode<::Crypto::Hash::SHA512, ::Crypto::Hash::MGF>(plaintext, label, public_key.length());
}
Optional<::Crypto::Hash::HashKind> hash_kind = {};
if (hash == "SHA-1")
hash_kind = ::Crypto::Hash::HashKind::SHA1;
else if (hash == "SHA-256")
hash_kind = ::Crypto::Hash::HashKind::SHA256;
else if (hash == "SHA-384")
hash_kind = ::Crypto::Hash::HashKind::SHA384;
else if (hash == "SHA-512")
hash_kind = ::Crypto::Hash::HashKind::SHA512;
// 4. If performing the operation results in an error, then throw an OperationError.
if (maybe_padding.is_error()) {
auto error_message = MUST(String::from_utf8(maybe_padding.error().string_literal()));
if (!hash_kind.has_value()) {
auto error_message = MUST(String::formatted("Invalid hash function '{}'", hash));
return WebIDL::OperationError::create(realm, error_message);
}
auto padding = maybe_padding.release_value();
// 5. Let ciphertext be the value C that results from performing the operation.
auto rsa = ::Crypto::PK::RSA { public_key };
auto maybe_ciphertext = rsa.encrypt(padding);
auto rsa = ::Crypto::PK::RSA_OAEP_EME { *hash_kind, public_key };
rsa.set_label(label);
auto maybe_ciphertext = rsa.encrypt(plaintext);
if (maybe_ciphertext.is_error())
return WebIDL::OperationError::create(realm, "Failed to encrypt"_string);
@ -717,36 +713,32 @@ WebIDL::ExceptionOr<GC::Ref<JS::ArrayBuffer>> RSAOAEP::decrypt(AlgorithmParams c
// 3. Perform the decryption operation defined in Section 7.1 of [RFC3447] with the key represented by key as the recipient's RSA private key,
// the contents of ciphertext as the ciphertext to be decrypted, C, and label as the label, L, and with the hash function specified by the hash attribute
// of the [[algorithm]] internal slot of key as the Hash option and MGF1 (defined in Section B.2.1 of [RFC3447]) as the MGF option.
auto rsa = ::Crypto::PK::RSA { private_key };
u32 private_key_length = private_key.length();
auto maybe_padding = rsa.decrypt(ciphertext);
if (maybe_padding.is_error())
return WebIDL::OperationError::create(realm, "Failed to encrypt"_string);
auto error_message = MUST(String::formatted("Invalid hash function '{}'", hash));
ErrorOr<ByteBuffer> maybe_plaintext = Error::from_string_view(error_message.bytes_as_string_view());
if (hash == "SHA-1") {
maybe_plaintext = ::Crypto::Padding::OAEP::eme_decode<::Crypto::Hash::SHA1, ::Crypto::Hash::MGF>(maybe_padding.release_value(), label, private_key_length);
} else if (hash == "SHA-256") {
maybe_plaintext = ::Crypto::Padding::OAEP::eme_decode<::Crypto::Hash::SHA256, ::Crypto::Hash::MGF>(maybe_padding.release_value(), label, private_key_length);
} else if (hash == "SHA-384") {
maybe_plaintext = ::Crypto::Padding::OAEP::eme_decode<::Crypto::Hash::SHA384, ::Crypto::Hash::MGF>(maybe_padding.release_value(), label, private_key_length);
} else if (hash == "SHA-512") {
maybe_plaintext = ::Crypto::Padding::OAEP::eme_decode<::Crypto::Hash::SHA512, ::Crypto::Hash::MGF>(maybe_padding.release_value(), label, private_key_length);
}
Optional<::Crypto::Hash::HashKind> hash_kind = {};
if (hash == "SHA-1")
hash_kind = ::Crypto::Hash::HashKind::SHA1;
else if (hash == "SHA-256")
hash_kind = ::Crypto::Hash::HashKind::SHA256;
else if (hash == "SHA-384")
hash_kind = ::Crypto::Hash::HashKind::SHA384;
else if (hash == "SHA-512")
hash_kind = ::Crypto::Hash::HashKind::SHA512;
// 4. If performing the operation results in an error, then throw an OperationError.
if (maybe_plaintext.is_error()) {
auto error_message = MUST(String::from_utf8(maybe_plaintext.error().string_literal()));
if (!hash_kind.has_value()) {
auto error_message = MUST(String::formatted("Invalid hash function '{}'", hash));
return WebIDL::OperationError::create(realm, error_message);
}
// 5. Let plaintext the value M that results from performing the operation.
auto plaintext = maybe_plaintext.release_value();
auto rsa = ::Crypto::PK::RSA_OAEP_EME { *hash_kind, private_key };
rsa.set_label(label);
auto maybe_plaintext = rsa.decrypt(ciphertext);
if (maybe_plaintext.is_error())
return WebIDL::OperationError::create(realm, "Failed to encrypt"_string);
// 6. Return the result of creating an ArrayBuffer containing plaintext.
return JS::ArrayBuffer::create(realm, move(plaintext));
return JS::ArrayBuffer::create(realm, maybe_plaintext.release_value());
}
// https://w3c.github.io/webcrypto/#rsa-oaep-operations