diff --git a/derparse-rs/Cargo.lock b/derparse-rs/Cargo.lock
index 833c5d4..315b034 100644
--- a/derparse-rs/Cargo.lock
+++ b/derparse-rs/Cargo.lock
@@ -42,15 +42,21 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.1.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
 
 [[package]]
 name = "base64"
-version = "0.21.5"
+version = "0.21.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35636a1494ede3b646cc98f74f8e62c773a38a659ebc777a2cf26b9b74171df9"
+checksum = "9d297deb1925b89f2ccc13d7635fa0714f12c87adce1c75356b39ca9b7178567"
+
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "der-parser"
@@ -69,21 +75,22 @@ dependencies = [
 name = "derparse-rs"
 version = "0.1.0"
 dependencies = [
- "base64",
+ "base64 0.21.7",
  "der-parser",
  "hex",
  "oid-registry",
+ "pem",
 ]
 
 [[package]]
 name = "displaydoc"
-version = "0.2.4"
+version = "0.2.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "487585f4d0c6655fe74905e2504d8ad6908e4db67f744eb140876906c2f3175d"
+checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.73",
 ]
 
 [[package]]
@@ -94,9 +101,9 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "memchr"
-version = "2.6.4"
+version = "2.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "minimal-lexical"
@@ -116,9 +123,9 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.17"
+version = "0.2.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39e3200413f237f41ab11ad6d161bc7239c84dcb631773ccd7de3dfe4b5c267c"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
 dependencies = [
  "autocfg",
 ]
@@ -133,19 +140,29 @@ dependencies = [
 ]
 
 [[package]]
-name = "proc-macro2"
-version = "1.0.69"
+name = "pem"
+version = "3.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "134c189feb4956b20f6f547d2cf727d4c0fe06722b20a0eec87ed445a97f92da"
+checksum = "8e459365e590736a54c3fa561947c84837534b8e9af6fc5bf781307e82658fae"
+dependencies = [
+ "base64 0.22.1",
+ "serde",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.86"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.33"
+version = "1.0.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
+checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
 dependencies = [
  "proc-macro2",
 ]
@@ -159,6 +176,26 @@ dependencies = [
  "nom",
 ]
 
+[[package]]
+name = "serde"
+version = "1.0.206"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b3e4cd94123dd520a128bcd11e34d9e9e423e7e3e50425cb1b4b1e3549d0284"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.206"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fabfb6138d2383ea8208cf98ccf69cdfb1aff4088460681d84189aa259762f97"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.73",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.109"
@@ -172,9 +209,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.39"
+version = "2.0.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23e78b90f2fcf45d3e842032ce32e3f2d1545ba6636271dcbf24fa306d87be7a"
+checksum = "837a7e8026c6ce912ff01cefbe8cafc2f8010ac49682e2a3d9decc3bce1ecaaf"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -195,22 +232,22 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.50"
+version = "1.0.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9a7210f5c9a7156bb50aa36aed4c95afb51df0df00713949448cf9e97d382d2"
+checksum = "c0342370b38b6a11b6cc11d6a805569958d54cfa061a29969c3b5ce2ea405724"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.50"
+version = "1.0.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "266b2e40bc00e5a6c09c3584011e08b06f123c00362c92b975ba9843aaaa14b8"
+checksum = "a4558b58466b9ad7ca0f102865eccc95938dca1a74a856f2b57b6629050da261"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.73",
 ]
 
 [[package]]
diff --git a/derparse-rs/Cargo.toml b/derparse-rs/Cargo.toml
index 8a794c1..ee0c2d2 100644
--- a/derparse-rs/Cargo.toml
+++ b/derparse-rs/Cargo.toml
@@ -10,5 +10,6 @@ base64 = "0.21.5"
 der-parser = "8.2.0"
 hex = "0.4.3"
 oid-registry = { version = "0.6.1", features = ["x962", "x509", "crypto", "pkcs1", "pkcs12", "pkcs7", "pkcs9", "kdf", "ms_spc", "nist_algs"] }
+pem = "3.0.4"
 
 
diff --git a/derparse-rs/src/main.rs b/derparse-rs/src/main.rs
index 31679ce..fc55a0a 100755
--- a/derparse-rs/src/main.rs
+++ b/derparse-rs/src/main.rs
@@ -9,12 +9,14 @@
 //! ```
 
 use std::fs;
+use std::str::FromStr;
 
 use base64::Engine;
 use der_parser::ber::{BerObject, BerObjectContent};
 use der_parser::Oid;
 use oid_registry::{OidEntry, OidRegistry};
 use oid_registry::asn1_rs::oid;
+use pem::Pem;
 
 fn main() {
     let args = std::env::args().skip(1).collect::<Vec<_>>();
@@ -23,7 +25,7 @@ fn main() {
         return;
     }
     let arg1 = &args[0];
-    let content = try_parse(arg1);
+    let content = try_load_and_parse(arg1);
     let ber_obj = match der_parser::parse_ber(&content) {
         Ok(ber_obj) => ber_obj.1,
         Err(e) => panic!("Parse DER failed: {}", e),
@@ -33,7 +35,22 @@ fn main() {
     print(&oid_reg, 0, &ber_obj);
 }
 
+fn try_load_and_parse(arg1: &str) -> Vec<u8> {
+    match fs::read(arg1) {
+        Ok(file_content) => match String::from_utf8(file_content.clone()) {
+            Ok(file_content_string) => try_parse(&file_content_string),
+            Err(_) => file_content,
+        }
+        Err(_) => try_parse(arg1)
+    }
+}
+
 fn try_parse(arg1: &str) -> Vec<u8> {
+    if arg1.contains("-----") {
+        let pem = Pem::from_str(arg1).expect("Parse pem failed.");
+        return pem.contents().to_vec();
+    }
+
     let arg1 = arg1.replace("\n", "").replace("\r", "");
     if let Ok(h) = hex::decode(&arg1) {
         return h;