"OpenSSL" Generating Certificates in DER and PEM

This section provides a tutorial example on how to generate certificates in DER and PEM formats using 'OpenSSL'.

After tested how "keytool" can be used to export certificates in DER and PEM formats, I decided to try with "OpenSSL" to see if it can generate certificates in DER and PEM formats or not. What I did was to:

The test session was recorded below:

>openssl genrsa -out herong.key -des 1024

Loading 'screen' into random state - done
Generating RSA private key, 1024 bit long modulus
.........................++++++
...................++++++
e is 65537 (0x10001)
Enter pass phrase for herong.key: keypass
Verifying - Enter pass phrase for herong.key: keypass

>openssl req -new -x509 -key herong.key -out openssl_crt.pem
-outform pem -config openssl.cnf

Enter pass phrase for herong.key: keypass
You are about to be asked to enter information that will be 
incorporated into your certificate request.
What you are about to enter is what is called a Distinguished 
Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [CA]:
State or Province Name (full name) [HY State]:
Locality Name (eg, city) [HY City]:
Organization Name (eg, company) [HY Company]:
Organizational Unit Name (eg, section) [HY Unit]:
Common Name (eg, YOUR name) [Herong Yang]:
Email Address [herongyang.com]:

>openssl x509 -in openssl_crt.pem -inform pem 
-out openssl_crt.der -outform der

Now I got one certificate generated by "OpenSSL" and stored in two files: openssl_crt.der and openssl_crt.pem. How can I verify that they are really using DER and PEM formats? I used "keytool" to try to view them as described in the next section.

Last update: 2013.

Table of Contents

 About This Book

 Cryptography Terminology

 Cryptography Basic Concepts

 Introduction to AES (Advanced Encryption Standard)

 Introduction to DES Algorithm

 DES Algorithm - Illustrated with Java Programs

 DES Algorithm Java Implementation

 DES Algorithm - Java Implementation in JDK JCE

 DES Encryption Operation Modes

 DES in Stream Cipher Modes

 PHP Implementation of DES - mcrypt

 Blowfish - 8-Byte Block Cipher

 Secret Key Generation and Management

 Cipher - Secret Key Encryption and Decryption

 Introduction of RSA Algorithm

 RSA Implementation using java.math.BigInteger Class

 Introduction of DSA (Digital Signature Algorithm)

 Java Default Implementation of DSA

 Private key and Public Key Pair Generation

 PKCS#8/X.509 Private/Public Encoding Standards

 Cipher - Public Key Encryption and Decryption

 MD5 Mesasge Digest Algorithm

 SHA1 Mesasge Digest Algorithm

 OpenSSL Introduction and Installation

 OpenSSL Generating and Managing RSA Keys

 OpenSSL Managing Certificates

 OpenSSL Generating and Signing CSR

 OpenSSL Validating Certificate Path

 "keytool" and "keystore" from JDK

 "OpenSSL" Signing CSR Generated by "keytool"

 Migrating Keys from "keystore" to "OpenSSL" Key Files

Certificate X.509 Standard and DER/PEM Formats

 X.509 Certificate Standard

 What Is DER (Distinguished Encoding Rules) Encoding?

 What Is PEM (Privacy Enhanced Mail) Encoding?

 Certificate in PEM Format

 "keytool" Exporting Certificates in DER and PEM

 "OpenSSL" Viewing Certificates in DER and PEM

"OpenSSL" Generating Certificates in DER and PEM

 "keytool" Viewing Certificates in DER and PEM

 "keytool" Importing Certificates in DER and PEM

 Migrating Keys from "OpenSSL" Key Files to "keystore"

 Using Certificates in IE (Internet Explorer)

 Using Certificates in Firefox

 Using Certificates in Google Chrome

 Outdated Tutorials

 References

 PDF Printing Version