From 410c23345788d5985a93008dd972b12c78809123 Mon Sep 17 00:00:00 2001
From: ioannanedelcu <ioannanedelcu@google.com>
Date: Mon, 8 Apr 2024 13:39:29 -0700
Subject: Add a proto structure for the Stateless Hash-Based Digital Signature
 Algorithm (SLH-DSA)

PiperOrigin-RevId: 622938993
---
 cc/proto/experimental/pqcrypto/slh_dsa.proto | 67 ++++++++++++++++++++++++++++
 proto/experimental/pqcrypto/slh_dsa.proto    | 67 ++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+)
 create mode 100644 cc/proto/experimental/pqcrypto/slh_dsa.proto
 create mode 100644 proto/experimental/pqcrypto/slh_dsa.proto

diff --git a/cc/proto/experimental/pqcrypto/slh_dsa.proto b/cc/proto/experimental/pqcrypto/slh_dsa.proto
new file mode 100644
index 000000000..b3768c64c
--- /dev/null
+++ b/cc/proto/experimental/pqcrypto/slh_dsa.proto
@@ -0,0 +1,67 @@
+// Copyright 2024 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.
+//
+///////////////////////////////////////////////////////////////////////////////
+syntax = "proto3";
+
+package google.crypto.tink;
+
+enum SlhDsaHashType {
+  SLH_DSA_HASH_TYPE_UNSPECIFIED = 0;
+  SHA2 = 1;
+  SHAKE = 2;
+}
+
+enum SlhDsaSignatureType {
+  SLH_DSA_SIGNATURE_TYPE_UNSPECIFIED = 0;
+  FAST_SIGNING = 1;
+  SMALL_SIGNATURE = 2;
+}
+
+// Protos for the Stateless Hash-Based Digital Signature Algorithm
+// https://csrc.nist.gov/pubs/fips/205/ipd
+message SlhDsaParams {
+  // Required
+  int32 key_size = 1;
+  // Required.
+  SlhDsaHashType hash_type = 2;
+  // Required.
+  SlhDsaSignatureType sig_type = 3;
+}
+
+message SlhDsaKeyFormat {
+  uint32 version = 1;
+  // Required.
+  SlhDsaParams params = 2;
+}
+
+// key_type: type.googleapis.com/google.crypto.tink.SlhDsaPublicKey
+message SlhDsaPublicKey {
+  // Required.
+  uint32 version = 1;
+  // Required.
+  bytes key_value = 2;
+  // Required
+  SlhDsaParams params = 3;
+}
+
+// key_type: type.googleapis.com/google.crypto.tink.SlhDsaPrivateKey
+message SlhDsaPrivateKey {
+  // Required.
+  uint32 version = 1;
+  // Required.
+  bytes key_value = 2;
+  // Required. The corresponding public key.
+  SlhDsaPublicKey public_key = 3;
+}
diff --git a/proto/experimental/pqcrypto/slh_dsa.proto b/proto/experimental/pqcrypto/slh_dsa.proto
new file mode 100644
index 000000000..b3768c64c
--- /dev/null
+++ b/proto/experimental/pqcrypto/slh_dsa.proto
@@ -0,0 +1,67 @@
+// Copyright 2024 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.
+//
+///////////////////////////////////////////////////////////////////////////////
+syntax = "proto3";
+
+package google.crypto.tink;
+
+enum SlhDsaHashType {
+  SLH_DSA_HASH_TYPE_UNSPECIFIED = 0;
+  SHA2 = 1;
+  SHAKE = 2;
+}
+
+enum SlhDsaSignatureType {
+  SLH_DSA_SIGNATURE_TYPE_UNSPECIFIED = 0;
+  FAST_SIGNING = 1;
+  SMALL_SIGNATURE = 2;
+}
+
+// Protos for the Stateless Hash-Based Digital Signature Algorithm
+// https://csrc.nist.gov/pubs/fips/205/ipd
+message SlhDsaParams {
+  // Required
+  int32 key_size = 1;
+  // Required.
+  SlhDsaHashType hash_type = 2;
+  // Required.
+  SlhDsaSignatureType sig_type = 3;
+}
+
+message SlhDsaKeyFormat {
+  uint32 version = 1;
+  // Required.
+  SlhDsaParams params = 2;
+}
+
+// key_type: type.googleapis.com/google.crypto.tink.SlhDsaPublicKey
+message SlhDsaPublicKey {
+  // Required.
+  uint32 version = 1;
+  // Required.
+  bytes key_value = 2;
+  // Required
+  SlhDsaParams params = 3;
+}
+
+// key_type: type.googleapis.com/google.crypto.tink.SlhDsaPrivateKey
+message SlhDsaPrivateKey {
+  // Required.
+  uint32 version = 1;
+  // Required.
+  bytes key_value = 2;
+  // Required. The corresponding public key.
+  SlhDsaPublicKey public_key = 3;
+}
-- 
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