| // Copyright 2017 The LUCI 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 utils |
| |
| import ( |
| "crypto/sha256" |
| "encoding/hex" |
| ) |
| |
| // TokenFingerprint returns first 16 bytes of SHA256 of the token, as hex. |
| // |
| // Token fingerprints can be used to identify tokens without parsing them. |
| func TokenFingerprint(tok string) string { |
| digest := sha256.Sum256([]byte(tok)) |
| return hex.EncodeToString(digest[:16]) |
| } |
