aes128 completely done.

ish. done-ish. it's entirely untested. CTR should work as i modeled it after PoC, and CBC *probably* works as it's straightforward, but I have no idea about the GCM. TODO.

internal/ciphers/aesCommon/funcs_aesbitsize.go

@@ -0,0 +1,9 @@
+package aesCommon
+
+// GetByteLen returns the length of *bytes* of an aesBitSize.
+func (a *aesBitSize) GetByteLen() (l int) {
+
+	l = int(*a) / 8
+
+	return
+}