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