diff --git a/src/crypto_rsa.rs b/src/crypto_rsa.rs
index 28289bf..9c684f3 100644
--- a/src/crypto_rsa.rs
+++ b/src/crypto_rsa.rs
@@ -4,11 +4,11 @@ use x509_parser::prelude::FromDer;
 use x509_parser::public_key::RSAPublicKey;
 use x509_parser::x509::SubjectPublicKeyInfo;
 
-use crate::util::decode_base64;
+use crate::util;
 
 /// Parse RSA Subject Public Key Info(SPKI) to Rsa Public Key
 pub fn parse_spki(pem: &str) -> XResult<RsaPublicKey> {
-    let der = pem_to_der_bytes(pem)?;
+    let der = util::parse_pem(pem)?;
     let spki = opt_result!(SubjectPublicKeyInfo::from_der(&der), "Parse SKPI failed: {}").1;
     let public_key_der = spki.subject_public_key.data;
     let public_key = opt_result!(RSAPublicKey::from_der(&public_key_der), "Parse RSA public key failed: {}").1;
@@ -19,25 +19,6 @@ pub fn parse_spki(pem: &str) -> XResult<RsaPublicKey> {
     Ok(rsa_public_key)
 }
 
-fn pem_to_der_bytes(pem: &str) -> XResult<Vec<u8>> {
-    let mut pem = pem.trim().to_owned();
-    if pem.starts_with("-----BEGIN") {
-        let mut filter_lines = vec![];
-        let lines = pem.lines().skip(1);
-        for ln in lines {
-            if ln.starts_with("-----END") {
-                break;
-            } else {
-                filter_lines.push(ln.to_string());
-            }
-        }
-        pem = filter_lines.join("");
-    }
-    pem = pem.chars().filter(|c| *c != '\n' && *c != '\r').clone().collect::<String>();
-
-    Ok(opt_result!(decode_base64(&pem), "Decode PEM failed: {}"))
-}
-
 #[test]
 fn test_parse_spki() {
     use rsa::traits::PublicKeyParts;
diff --git a/src/util.rs b/src/util.rs
index d741e50..71d9df0 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -5,7 +5,7 @@ use std::path::{Path, PathBuf};
 use base64::Engine;
 use base64::engine::general_purpose;
 use rand::random;
-use rust_util::{information, print_ex, simple_error, util_term, warning, XResult};
+use rust_util::{information, opt_result, print_ex, simple_error, util_term, warning, XResult};
 use zeroize::Zeroize;
 
 use crate::consts::TINY_ENC_FILE_EXT;
@@ -109,6 +109,25 @@ pub fn simple_kdf(input: &[u8]) -> Vec<u8> {
     input
 }
 
+pub fn parse_pem(pem: &str) -> XResult<Vec<u8>> {
+    let mut pem = pem.trim().to_owned();
+    if pem.starts_with("-----BEGIN") {
+        let mut filter_lines = vec![];
+        let lines = pem.lines().skip(1);
+        for ln in lines {
+            if ln.starts_with("-----END") {
+                break;
+            } else {
+                filter_lines.push(ln.to_string());
+            }
+        }
+        pem = filter_lines.join("");
+    }
+    pem = pem.chars().filter(|c| *c != '\n' && *c != '\r').clone().collect::<String>();
+
+    Ok(opt_result!(decode_base64(&pem), "Decode PEM failed: {}"))
+}
+
 pub fn to_pem(bs: &[u8], name: &str) -> String {
     let bs_base64 = encode_base64(bs);
     let mut pem = String::with_capacity(bs.len() + 64);