This module allows one to (re)generate OpenSSL private keys. One can generate RSA, DSA, ECC or EdDSA private keys.; Keys are generated in PEM format. Please note that the module regenerates private keys if they don’t match the module’s options. Reasons for importing keys include wanting to make a backup of a private key (generated keys are non-exportable, for security reasons), or if the private key is provided by an external source. This document will guide you through using the OpenSSL command line tool to generate a key pair which you can then import into a YubiKey.

1. Openssl Generate Pem Public Key
2. Generate Private Key From Pem

∟Certificate X.509 Standard and DER/PEM Formats

∟'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:

• Run 'openssl genrsa' to generate a RSA key pair.
• Run 'openssl req -new -x509' to generate a self-signed certificate and stored it in PEM format.
• Run 'openssl x509' to convert the certificate from PEM encoding to DER format.

The test session was recorded below:

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.

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

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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

Using Certificates in Google Chrome

Using Certificates in Firefox

Outdated Tutorials

References

Full Version in PDF/EPUB

Common OpenSSL Commands with Keys and Certificates

Generate RSA private key with certificate in a single command

Openssl Generate Pem Public Key

Generate Certificate Signing Request (CSR) from private key with passphrase

Generate RSA private key (2048 bit)

Generate a Certificate Signing Request (CSR)

Generate RSA private key (2048 bit) and a Certificate Signing Request (CSR) with a single command

Convert private key to PEM format

Generate a self-signed certificate that is valid for a year with sha256 hash

View details of a RSA private key

View details of a CSR

View details of a Certificate

View details of a Certificate in DER format

Convert a DER file (.crt .cer .der) to PEM

Generate Private Key From Pem

Convert a PEM file to DER