various API uniformization

rlwe/src/plaintext.rs

@@ -0,0 +1,17 @@
+use crate::ciphertext::Ciphertext;
+use crate::elem::Elem;
+use crate::parameters::Parameters;
+
+pub struct Plaintext(pub Elem);
+
+impl Parameters {
+    pub fn new_plaintext(&self, log_q: usize) -> Plaintext {
+        Plaintext(self.new_elem(0, log_q))
+    }
+}
+
+impl Plaintext {
+    pub fn as_ciphertext(&self) -> Ciphertext {
+        unsafe { Ciphertext(std::ptr::read(&self.0)) }
+    }
+}