Add validation for grpc requests and cosmos messages

.golangci.yml

@@ -19,6 +19,12 @@ issues:
   exclude:
     - "ineffective break statement. Did you mean to break out of the outer loop"
 
+  exclude-rules:
+    - path: x/xvalidator/validator.go
+      linters:
+        - golint
+      text: "exported var Translator should have its own declaration"
+
 linters:
   enable-all: true
   disable:

hash/hash.go

@@ -93,6 +93,15 @@ func Decode(h string) (Hash, error) {
 	return Hash(hash), nil
 }
 
+// DecodeFromBytes decodes hash and checks it length.
+// It returns empty hash on nil slice of bytes.
+func DecodeFromBytes(data []byte) (Hash, error) {
+	if len(data) != size {
+		return nil, fmt.Errorf("hash: invalid length")
+	}
+	return Hash(data), nil
+}
+
 // IsZero reports whethere h represents empty hash.
 func (h Hash) IsZero() bool {
 	return len(h) == 0