| // Copyright 2019, 2020 OCI Contributors | |
| // Copyright 2017 Docker, Inc. | |
| // | |
| // 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 | |
| // | |
| // https://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 digest | |
| import ( | |
| "hash" | |
| "io" | |
| ) | |
| // Verifier presents a general verification interface to be used with message | |
| // digests and other byte stream verifications. Users instantiate a Verifier | |
| // from one of the various methods, write the data under test to it then check | |
| // the result with the Verified method. | |
| type Verifier interface { | |
| io.Writer | |
| // Verified will return true if the content written to Verifier matches | |
| // the digest. | |
| Verified() bool | |
| } | |
| type hashVerifier struct { | |
| digest Digest | |
| hash hash.Hash | |
| } | |
| func (hv hashVerifier) Write(p []byte) (n int, err error) { | |
| return hv.hash.Write(p) | |
| } | |
| func (hv hashVerifier) Verified() bool { | |
| return hv.digest == NewDigest(hv.digest.Algorithm(), hv.hash) | |
| } |