fix(deps): update github.com/containers/common digest to 3e93a76

Signed-off-by: Renovate Bot <bot@renovateapp.com>

vendor/github.com/transparency-dev/merkle/hasher.go

@@ -0,0 +1,32 @@
+// Copyright 2017 Google LLC. All Rights Reserved.
+//
+// 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 merkle provides Merkle tree interfaces and implementation.
+package merkle
+
+// TODO(pavelkalinnikov): Remove this root package. The only interface provided
+// here does not have to exist, and can be [re-]defined on the user side, such
+// as in compact or proof package.
+
+// LogHasher provides the hash functions needed to compute dense merkle trees.
+type LogHasher interface {
+	// EmptyRoot supports returning a special case for the root of an empty tree.
+	EmptyRoot() []byte
+	// HashLeaf computes the hash of a leaf that exists.
+	HashLeaf(leaf []byte) []byte
+	// HashChildren computes interior nodes.
+	HashChildren(l, r []byte) []byte
+	// Size returns the number of bytes the Hash* functions will return.
+	Size() int
+}