| // 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) |
| } |
