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32 lines
550 B
32 lines
550 B
10 years ago
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package sha256
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import (
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"io"
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"crypto/sha256"
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)
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// Sum256 - single caller sha256 helper
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func Sum256(data []byte) []byte {
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d := sha256.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 sha256 helper
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func Sum(reader io.Reader) ([]byte, error) {
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d := sha256.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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