Initial QSfera import

Server/vendor/github.com/open-policy-agent/opa/bundle/hash.go

@@ -0,0 +1,32 @@
+// Copyright 2020 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+package bundle
+
+import (
+	v1 "github.com/open-policy-agent/opa/v1/bundle"
+)
+
+// HashingAlgorithm represents a subset of hashing algorithms implemented in Go
+type HashingAlgorithm = v1.HashingAlgorithm
+
+// Supported values for HashingAlgorithm
+const (
+	MD5       = v1.MD5
+	SHA1      = v1.SHA1
+	SHA224    = v1.SHA224
+	SHA256    = v1.SHA256
+	SHA384    = v1.SHA384
+	SHA512    = v1.SHA512
+	SHA512224 = v1.SHA512224
+	SHA512256 = v1.SHA512256
+)
+
+// SignatureHasher computes a signature digest for a file with (structured or unstructured) data and policy
+type SignatureHasher = v1.SignatureHasher
+
+// NewSignatureHasher returns a signature hasher suitable for a particular hashing algorithm
+func NewSignatureHasher(alg HashingAlgorithm) (SignatureHasher, error) {
+	return v1.NewSignatureHasher(alg)
+}