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Add RsaSsaPssParameters object in C++.
PiperOrigin-RevId: 581240807 Change-Id: Ib416d27028e60a08e09eb3423767b4f826d14f7a
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| // Copyright 2023 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| //////////////////////////////////////////////////////////////////////////////// | ||
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| #include "tink/signature/rsa_ssa_pss_parameters.h" | ||
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| #include <set> | ||
| #include <string> | ||
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| #include "absl/status/status.h" | ||
| #include "absl/strings/str_cat.h" | ||
| #include "absl/strings/string_view.h" | ||
| #ifdef OPENSSL_IS_BORINGSSL | ||
| #include "openssl/base.h" | ||
| #else | ||
| #include "openssl/bn.h" | ||
| #endif | ||
| #include "tink/big_integer.h" | ||
| #include "tink/internal/bn_util.h" | ||
| #include "tink/internal/rsa_util.h" | ||
| #include "tink/internal/ssl_unique_ptr.h" | ||
| #include "tink/parameters.h" | ||
| #include "tink/util/status.h" | ||
| #include "tink/util/statusor.h" | ||
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| namespace crypto { | ||
| namespace tink { | ||
| namespace { | ||
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| constexpr int kF4 = 65537; | ||
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| } // namespace | ||
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| RsaSsaPssParameters::Builder& | ||
| RsaSsaPssParameters::Builder::SetModulusSizeInBits(int modulus_size_in_bits) { | ||
| modulus_size_in_bits_ = modulus_size_in_bits; | ||
| return *this; | ||
| } | ||
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| RsaSsaPssParameters::Builder& RsaSsaPssParameters::Builder::SetPublicExponent( | ||
| const BigInteger& public_exponent) { | ||
| public_exponent_ = public_exponent; | ||
| return *this; | ||
| } | ||
|
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| RsaSsaPssParameters::Builder& RsaSsaPssParameters::Builder::SetSigHashType( | ||
| HashType sig_hash_type) { | ||
| sig_hash_type_ = sig_hash_type; | ||
| return *this; | ||
| } | ||
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| RsaSsaPssParameters::Builder& RsaSsaPssParameters::Builder::SetMgf1HashType( | ||
| HashType mgf1_hash_type) { | ||
| mgf1_hash_type_ = mgf1_hash_type; | ||
| return *this; | ||
| } | ||
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| RsaSsaPssParameters::Builder& | ||
| RsaSsaPssParameters::Builder::SetSaltLengthInBytes(int salt_length_in_bytes) { | ||
| salt_length_in_bytes_ = salt_length_in_bytes; | ||
| return *this; | ||
| } | ||
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| RsaSsaPssParameters::Builder& RsaSsaPssParameters::Builder::SetVariant( | ||
| Variant variant) { | ||
| variant_ = variant; | ||
| return *this; | ||
| } | ||
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| util::StatusOr<RsaSsaPssParameters> RsaSsaPssParameters::Builder::Build() { | ||
| if (!modulus_size_in_bits_.has_value()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Key size is not set."); | ||
| } | ||
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| if (!sig_hash_type_.has_value()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Signature hash type is not set."); | ||
| } | ||
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| if (!mgf1_hash_type_.has_value()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "MGF1 hash type is not set."); | ||
| } | ||
|
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| if (!salt_length_in_bytes_.has_value()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Salt length is not set."); | ||
| } | ||
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| if (!variant_.has_value()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Variant is not set."); | ||
| } | ||
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| if (*salt_length_in_bytes_ < 0) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| absl::StrCat("Invalid salt length in bytes: ", *salt_length_in_bytes_, | ||
| ". Salt length must be positive.")); | ||
| } | ||
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| // Validate hash. | ||
| static const std::set<HashType>* supported_hashes = new std::set<HashType>( | ||
| {HashType::kSha256, HashType::kSha384, HashType::kSha512}); | ||
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| if (supported_hashes->find(*sig_hash_type_) == supported_hashes->end()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Cannot create RsaSsaPss parameters with unknown SigHashType."); | ||
| } | ||
|
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| if (supported_hashes->find(*mgf1_hash_type_) == supported_hashes->end()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Cannot create RsaSsaPss parameters with unknown Mgf1HashType."); | ||
| } | ||
|
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| if (*sig_hash_type_ != *mgf1_hash_type_) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Signature hash type and MGF1 hash type should match."); | ||
| } | ||
|
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| // Validate modulus size. | ||
| if (*modulus_size_in_bits_ < 2048) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| absl::StrCat("Invalid key size: must be at least 2048 bits, got ", | ||
| *modulus_size_in_bits_, " bits.")); | ||
| } | ||
|
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| // Validate the public exponent: public exponent needs to be odd, greater than | ||
| // 65536 and (for consistency with BoringSSL), smaller that 32 bits. | ||
| util::Status exponent_status = | ||
| internal::ValidateRsaPublicExponent(public_exponent_.GetValue()); | ||
| if (!exponent_status.ok()) { | ||
| return exponent_status; | ||
| } | ||
|
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| // Validate variant. | ||
| static const std::set<Variant>* supported_variants = | ||
| new std::set<Variant>({Variant::kTink, Variant::kCrunchy, | ||
| Variant::kLegacy, Variant::kNoPrefix}); | ||
| if (supported_variants->find(*variant_) == supported_variants->end()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Cannot create RsaSsaPss parameters with unknown variant."); | ||
| } | ||
| return RsaSsaPssParameters(*modulus_size_in_bits_, public_exponent_, | ||
| *sig_hash_type_, *mgf1_hash_type_, | ||
| *salt_length_in_bytes_, *variant_); | ||
| } | ||
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| bool RsaSsaPssParameters::operator==(const Parameters& other) const { | ||
| const RsaSsaPssParameters* that = | ||
| dynamic_cast<const RsaSsaPssParameters*>(&other); | ||
| if (that == nullptr) { | ||
| return false; | ||
| } | ||
| if (modulus_size_in_bits_ != that->modulus_size_in_bits_) { | ||
| return false; | ||
| } | ||
| if (public_exponent_ != that->public_exponent_) { | ||
| return false; | ||
| } | ||
| if (sig_hash_type_ != that->sig_hash_type_) { | ||
| return false; | ||
| } | ||
| if (mgf1_hash_type_ != that->mgf1_hash_type_) { | ||
| return false; | ||
| } | ||
| if (salt_length_in_bytes_ != that->salt_length_in_bytes_) { | ||
| return false; | ||
| } | ||
| if (variant_ != that->variant_) { | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
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| // Returns the big endian encoded F4 value as a public exponent default. | ||
| BigInteger RsaSsaPssParameters::Builder::CreateDefaultPublicExponent() { | ||
| internal::SslUniquePtr<BIGNUM> e(BN_new()); | ||
| BN_set_word(e.get(), kF4); | ||
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| std::string F4_string = | ||
| internal::BignumToString(e.get(), BN_num_bytes(e.get())).value(); | ||
| return BigInteger(F4_string); | ||
| } | ||
|
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| } // namespace tink | ||
| } // namespace crypto |
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