refactor: rename files *_util.go to *_internal.go

cryptor/crypt_util.go

@@ -1,37 +0,0 @@
-package cryptor
-
-import "bytes"
-
-func generateAesKey(key []byte) []byte {
-	genKey := make([]byte, 16)
-	copy(genKey, key)
-	for i := 16; i < len(key); {
-		for j := 0; j < 16 && i < len(key); j, i = j+1, i+1 {
-			genKey[j] ^= key[i]
-		}
-	}
-	return genKey
-}
-
-func generateDesKey(key []byte) []byte {
-	genKey := make([]byte, 8)
-	copy(genKey, key)
-	for i := 8; i < len(key); {
-		for j := 0; j < 8 && i < len(key); j, i = j+1, i+1 {
-			genKey[j] ^= key[i]
-		}
-	}
-	return genKey
-}
-
-func pkcs7Padding(src []byte, blockSize int) []byte {
-	padding := blockSize - len(src)%blockSize
-	padText := bytes.Repeat([]byte{byte(padding)}, padding)
-	return append(src, padText...)
-}
-
-func pkcs7UnPadding(src []byte) []byte {
-	length := len(src)
-	unPadding := int(src[length-1])
-	return src[:(length - unPadding)]
-}