62 lines
1.2 KiB
Go
62 lines
1.2 KiB
Go
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package s3crypto
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import (
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"crypto/md5"
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"crypto/sha256"
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"hash"
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"io"
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)
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// hashReader is used for calculating SHA256 when following the sigv4 specification.
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// Additionally this used for calculating the unencrypted MD5.
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type hashReader interface {
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GetValue() []byte
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GetContentLength() int64
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}
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type sha256Writer struct {
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sha256 []byte
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hash hash.Hash
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out io.Writer
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}
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func newSHA256Writer(f io.Writer) *sha256Writer {
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return &sha256Writer{hash: sha256.New(), out: f}
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}
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func (r *sha256Writer) Write(b []byte) (int, error) {
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r.hash.Write(b)
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return r.out.Write(b)
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}
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func (r *sha256Writer) GetValue() []byte {
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return r.hash.Sum(nil)
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}
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type md5Reader struct {
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contentLength int64
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hash hash.Hash
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body io.Reader
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}
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func newMD5Reader(body io.Reader) *md5Reader {
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return &md5Reader{hash: md5.New(), body: body}
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}
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func (w *md5Reader) Read(b []byte) (int, error) {
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n, err := w.body.Read(b)
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if err != nil && err != io.EOF {
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return n, err
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}
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w.contentLength += int64(n)
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w.hash.Write(b[:n])
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return n, err
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}
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func (w *md5Reader) GetValue() []byte {
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return w.hash.Sum(nil)
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}
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func (w *md5Reader) GetContentLength() int64 {
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return w.contentLength
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}
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