github.com/olivere/camlistore@v0.0.0-20140121221811-1b7ac2da0199/pkg/misc/misc.go (about)

     1  /*
     2  Copyright 2013 The Camlistore Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8       http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  // Package misc contains stuff which should probably move elsewhere.
    18  //
    19  // This is a gross place to put code.
    20  package misc
    21  
    22  import (
    23  	"crypto/sha256"
    24  	"fmt"
    25  )
    26  
    27  // SHA256Prefix computes the SHA-256 digest of data and returns
    28  // its first twenty lowercase hex digits.
    29  func SHA256Prefix(data []byte) string {
    30  	h := sha256.New()
    31  	h.Write(data)
    32  	return fmt.Sprintf("%x", h.Sum(nil))[:20]
    33  }