downloads API, UI

secretstore/reader.go

@@ -0,0 +1,68 @@
+package secretstore
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"io"
+)
+
+func (s *Store) NewReader(reader io.Reader) (r io.Reader, err error) {
+	iv := [aes.BlockSize]byte{}
+
+	err = readFull(reader, iv[:])
+	if err != nil {
+		return
+	}
+
+	r = storeReader{reader, s.NewDecrypter(iv)}
+	return
+}
+
+type storeReader struct {
+	reader    io.Reader
+	decrypter cipher.Stream
+}
+
+func (r storeReader) Read(ba []byte) (n int, err error) {
+	n, err = r.reader.Read(ba)
+
+	if n > 0 {
+		r.decrypter.XORKeyStream(ba[:n], ba[:n])
+	}
+
+	return
+}
+
+func (s *Store) NewWriter(writer io.Writer) (r io.Writer, err error) {
+	iv := [aes.BlockSize]byte{}
+
+	if err = randRead(iv[:]); err != nil {
+		return
+	}
+
+	_, err = writer.Write(iv[:])
+	if err != nil {
+		return
+	}
+
+	r = storeWriter{writer, s.NewEncrypter(iv)}
+	return
+}
+
+type storeWriter struct {
+	writer    io.Writer
+	encrypter cipher.Stream
+}
+
+func (r storeWriter) Write(ba []byte) (n int, err error) {
+	if len(ba) == 0 {
+		return
+	}
+
+	encBA := make([]byte, len(ba))
+	r.encrypter.XORKeyStream(encBA, ba)
+
+	n, err = r.writer.Write(encBA)
+
+	return
+}