Lowercase hashes before comparing them (#10)

core/hash.go

@@ -4,13 +4,14 @@ import (
 	"crypto/md5"
 	"crypto/sha256"
 	"crypto/sha512"
+	"strings"
 	"errors"
 	"hash"
 )
 
 // GetHashImpl gets an implementation of hash.Hash for the given hash type string
 func GetHashImpl(hashType string) (hash.Hash, error) {
-	switch hashType {
+	switch strings.ToLower(hashType) {
 	case "sha256":
 		return sha256.New(), nil
 	case "sha512":