diff --git a/Cargo.lock b/Cargo.lock
index da18b1b..6e83adb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2178,6 +2178,7 @@ dependencies = [
  "base64 0.13.0",
  "chrono",
  "clap",
+ "digest",
  "hex",
  "openpgp-card",
  "openssl",
@@ -2191,6 +2192,8 @@ dependencies = [
  "sha2",
  "simpledateformat",
  "u2f",
+ "x509",
+ "x509-parser",
  "yubico_manager",
  "yubikey",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index b26e707..ad75e13 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,5 +24,8 @@ simpledateformat = "0.1.2"
 ring = "0.16.20"
 openssl = "0.10.35"
 pem = "0.8.3"
+digest = "0.9.0"
 yubikey = "0.4.2"
 yubico_manager = "0.8.1"
+x509 = "0.2"
+x509-parser = "0.9"
diff --git a/src/chall.rs b/src/chall.rs
index 5a823e8..e60e96e 100644
--- a/src/chall.rs
+++ b/src/chall.rs
@@ -10,7 +10,7 @@ impl Command for CommandImpl {
     fn name(&self) -> &str { "chall" }
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
-        SubCommand::with_name(self.name()).about("OpenPGP Card List subcommand")
+        SubCommand::with_name(self.name()).about("Yubikey challenge-response hmac")
             .arg(Arg::with_name("challenge").long("challenge").takes_value(true).help("Challenge"))
             .arg(Arg::with_name("challenge-hex").long("challenge-hex").takes_value(true).help("Challenge HEX"))
             .arg(Arg::with_name("json").long("json").help("JSON output"))
diff --git a/src/challconfig.rs b/src/challconfig.rs
index 2199df4..86fd6e4 100644
--- a/src/challconfig.rs
+++ b/src/challconfig.rs
@@ -11,7 +11,7 @@ impl Command for CommandImpl {
     fn name(&self) -> &str { "chall-config" }
 
     fn subcommand<'a>(&self) -> App<'a, 'a> {
-        SubCommand::with_name(self.name()).about("OpenPGP Card List subcommand")
+        SubCommand::with_name(self.name()).about("Yubikey challenge-response hmac config")
             .arg(Arg::with_name("secret").long("secret").takes_value(true).help("Secret"))
             .arg(Arg::with_name("secret-hex").long("secret-hex").takes_value(true).help("Secret HEX"))
             .arg(Arg::with_name("yes-config-chall").long("yes-config-chall").help("Config chall key"))
diff --git a/src/pgpcardlist.rs b/src/pgpcardlist.rs
index 4ea3891..cbdd5be 100644
--- a/src/pgpcardlist.rs
+++ b/src/pgpcardlist.rs
@@ -63,9 +63,10 @@ impl Command for CommandImpl {
                         Result::Ok(user) => {
                             let h = hex::decode("8f25018489d6fe0dec34a352314c38dc146247b7de65735790f4398a92afa84b").unwrap();
                             let mut hh = [0_u8; 0x20];
-                            for i in 0..hh.len() {
-                                hh[i] = h[i];
-                            }
+                            // for i in 0..hh.len() {
+                            //     hh[i] = h[i];
+                            // }
+                            hh.clone_from_slice(&h[..0x20]);
                             let aa = user.signature_for_hash(Hash::SHA256(hh));
                             println!("////// {}", hex::encode(&aa.unwrap()));
                         }
diff --git a/src/piv.rs b/src/piv.rs
index 3a0d93e..fa9455e 100644
--- a/src/piv.rs
+++ b/src/piv.rs
@@ -1,5 +1,13 @@
 use clap::{ArgMatches, SubCommand, App, Arg};
 use crate::cmd::{Command, CommandError};
+use yubikey::{YubiKey, Certificate};
+use yubikey::piv::SlotId;
+use rust_util::XResult;
+use sha2::Sha256;
+use x509_parser::parse_x509_certificate;
+use pem::Pem;
+use digest::Digest;
+use rust_util::util_msg::MessageType;
 
 pub struct CommandImpl;
 
@@ -12,6 +20,69 @@ impl Command for CommandImpl {
     }
 
     fn run(&self, _arg_matches: &ArgMatches, _sub_arg_matches: &ArgMatches) -> CommandError {
+        let mut yk = YubiKey::open()?;
+        success!("Name: {}", yk.name());
+        success!("Version: {}", yk.version());
+        success!("Serial: {}", yk.serial());
+        match yk.chuid() {
+            Ok(chuid) => success!("CHUID: {}",chuid.to_string()),
+            Err(e) => warning!("CHUID: <none> {}", e),
+        }
+        match yk.cccid() {
+            Ok(cccid) => success!("CCCID: {}",cccid.to_string()),
+            Err(e) => warning!("CCCID: <none> {}", e),
+        }
+        match yk.get_pin_retries() {
+            Ok(pin_retries) => success!("PIN retries: {}",pin_retries),
+            Err(e) => warning!("PIN retries: <none> {}", e),
+        }
+        for slot in yubikey::piv::SLOTS.iter().cloned() {
+            print_cert_info(&mut yk, slot).ok();
+        }
         Ok(())
     }
 }
+
+fn print_cert_info(yubikey: &mut YubiKey, slot: SlotId) -> XResult<()> {
+    let cert = match Certificate::read(yubikey, slot) {
+        Ok(c) => c,
+        Err(e) => {
+            debugging!("error reading certificate in slot {:?}: {}", slot, e);
+            return simple_error!("error reading certificate in slot {:?}: {}", slot, e);
+        }
+    };
+    let buf = cert.into_buffer();
+
+    if !buf.is_empty() {
+        let fingerprint_sha256 = Sha256::digest(&buf);
+
+        let slot_id: u8 = slot.into();
+        success!("Slot: {}",  format!("{:x}", slot_id));
+
+        rust_util::util_msg::when(MessageType::DEBUG, || {
+            let cert_pem_obj = Pem {
+                tag: String::from("CERTIFICATE"),
+                contents: buf.to_vec(),
+            };
+            debugging!("{}", pem::encode(&cert_pem_obj).trim());
+        });
+
+        match parse_x509_certificate(&buf) {
+            Ok((_rem, cert)) => {
+                success!("Algorithm: {}", cert.tbs_certificate.subject_pki.algorithm.algorithm);
+
+                success!("Subject: {}", cert.tbs_certificate.subject);
+                success!("Issuer: {}", cert.tbs_certificate.issuer);
+                success!("Fingerprint SHA256: {}", hex::encode(fingerprint_sha256));
+                success!("Not Before: {}", cert.tbs_certificate.validity.not_before.to_rfc2822());
+                success!("Not After: {}", cert.tbs_certificate.validity.not_after.to_rfc2822());
+            }
+            _ => {
+                warning!("Failed to parse certificate");
+                return Ok(());
+            }
+        };
+    }
+
+    Ok(())
+}