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minio/pkg/utils/crypto/md5/md5.go

44 lines
1.2 KiB

/*
* Minimalist Object Storage, (C) 2014 Minio, 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
*
* 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 md5
import (
"crypto/md5"
"io"
)
// Sum - low memory footprint io.Reader based md5sum helper
func Sum(reader io.Reader) ([]byte, error) {
hash := md5.New()
var err error
var length int
for err == nil {
byteBuffer := make([]byte, 1024*1024)
length, err = reader.Read(byteBuffer)
// While hash.Write() wouldn't mind a Nil byteBuffer
// It is necessary for us to verify this and break
if length == 0 {
break
}
byteBuffer = byteBuffer[0:length]
hash.Write(byteBuffer)
}
if err != io.EOF {
return nil, err
}
return hash.Sum(nil), nil
}