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.

errs/errors.go

@@ -0,0 +1,13 @@
+package errs
+
+import (
+	"errors"
+)
+
+var (
+	ErrBadData    error = errors.New("unable to serialize/cast data into buffer; unknown or invalid data object")
+	ErrBadIVLen         = errors.New("the cipher IV/nonce does not match the expected key size/is of an invalid length")
+	ErrBadKeyLen        = errors.New("the cipher key does not match the expected key size/is of an invalid length")
+	ErrMissingIV        = errors.New("the cipher IV/nonce is empty or missing; Cipher was not setup properly")
+	ErrMissingKey       = errors.New("the cipher key is empty or missing; Cipher was not setup properly")
+)

errs/errs.go

@@ -1,9 +0,0 @@
-package errs
-
-import (
-	"errors"
-)
-
-var (
-	ErrBadData = errors.New("unable to serialize/cast data into buffer; unknown or invalid data object")
-)