mirror of https://github.com/perkeep/perkeep.git
41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
/*
|
|
Copyright 2013 The Camlistore 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 hashutil contains misc hashing functions lacking homes elsewhere.
|
|
package hashutil
|
|
|
|
import (
|
|
"crypto/sha1"
|
|
"crypto/sha256"
|
|
"fmt"
|
|
)
|
|
|
|
// SHA256Prefix computes the SHA-256 digest of data and returns
|
|
// its first twenty lowercase hex digits.
|
|
func SHA256Prefix(data []byte) string {
|
|
h := sha256.New()
|
|
h.Write(data)
|
|
return fmt.Sprintf("%x", h.Sum(nil))[:20]
|
|
}
|
|
|
|
// SHA1Prefix computes the SHA-1 digest of data and returns
|
|
// its first twenty lowercase hex digits.
|
|
func SHA1Prefix(data []byte) string {
|
|
h := sha1.New()
|
|
h.Write(data)
|
|
return fmt.Sprintf("%x", h.Sum(nil))[:20]
|
|
}
|