Internal change.

PiperOrigin-RevId: 345538979

pkg/crypto/BUILD

@@ -0,0 +1,12 @@
+load("//tools:defs.bzl", "go_library")
+
+package(licenses = ["notice"])
+
+go_library(
+    name = "crypto",
+    srcs = [
+        "crypto.go",
+        "crypto_stdlib.go",
+    ],
+    visibility = ["//:sandbox"],
+)

pkg/crypto/crypto.go

@@ -0,0 +1,16 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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.
+
+// Package crypto wraps crypto primitives.
+package crypto

pkg/crypto/crypto_stdlib.go

@@ -0,0 +1,32 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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.
+
+package crypto
+
+import (
+	"crypto/ecdsa"
+	"crypto/sha512"
+	"math/big"
+)
+
+// EcdsaVerify verifies the signature in r, s of hash using ECDSA and the
+// public key, pub. Its return value records whether the signature is valid.
+func EcdsaVerify(pub *ecdsa.PublicKey, hash []byte, r, s *big.Int) bool {
+	return ecdsa.Verify(pub, hash, r, s)
+}
+
+// SumSha384 returns the SHA384 checksum of the data.
+func SumSha384(data []byte) (sum384 [sha512.Size384]byte) {
+	return sha512.Sum384(data)
+}