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69 lines
1.6 KiB
69 lines
1.6 KiB
/*
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* Minio Cloud Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package sha512
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import (
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"hash"
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"io"
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"crypto/sha512"
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)
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// The size of a SHA512 checksum in bytes.
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const (
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Size = sha512.Size
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)
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// Sum512 - single caller sha512 helper
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func Sum512(data []byte) []byte {
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d := sha512.New()
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d.Write(data)
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return d.Sum(nil)
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}
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// Sum - io.Reader based streaming sha512 helper
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func Sum(reader io.Reader) ([]byte, error) {
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d := sha512.New()
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var err error
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for err == nil {
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length := 0
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byteBuffer := make([]byte, 1024*1024)
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length, err = reader.Read(byteBuffer)
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byteBuffer = byteBuffer[0:length]
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d.Write(byteBuffer)
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}
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if err != io.EOF {
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return nil, err
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}
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return d.Sum(nil), nil
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}
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// SumStream - similar to 'Sum()' but returns a [sha512.Size]byte
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func SumStream(reader io.Reader) ([sha512.Size]byte, error) {
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var returnValue [sha512.Size]byte
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sumSlice, err := Sum(reader)
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if err != nil {
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return returnValue, err
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}
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copy(returnValue[:], sumSlice)
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return returnValue, err
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}
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// New returns a new hash.Hash computing SHA512.
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func New() hash.Hash {
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return sha512.New()
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}
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