// Absolute Base64-encoded encryption function. The return ciphertext
// is a base64-encoded ciphertext.
func AbsEncrypt(key []byte, pt []byte) (ct []byte, err error) {
rawkey, err := decodeKey(key)
if err != nil {
return
}
enc, err := symmetric.Encrypt(rawkey, pt)
if err != nil {
return
}
ct = trim(EncodeBase64(enc))
return
}
func encrypt(w http.ResponseWriter, upload *Upload) {
key := hash.DeriveKey(upload.Password)
if key == nil {
serverError(w, "failed to generate key")
return
}
out := key.Salt
enc, err := symmetric.Encrypt(key.Key, upload.Data)
if err != nil {
serverError(w, "encryption failure: "+err.Error())
return
}
out = append(out, enc...)
w.Header().Add("content-type", "application/octet-stream")
w.Header().Add("content-disposition", "attachment; filename="+upload.Name)
w.Write(out)
}
func Encrypt(key []byte, msg []byte) (ct []byte, err error) {
h := hash.New(msg)
pt := h.Digest()
pt = append(pt, msg...)
return symmetric.Encrypt(key, pt)
}