Cryptography Tutorials - Herong's Tutorial Examples

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

∟"keytool -exportcert" Exporting PrivateKeyEntry

This section provides a tutorial example on how to export a 'PrivateKeyEntry' stored in a 'keystore' file using the 'keytool -exportcert' command.

After generating my key pair with the "keytool -genkeypair" command, I got a PrivateKeyEntry inside the keystore file, herong.jks. So I tried to export it using the "keytool -exportcert" command as shown in the following command session: 

herong> keytool -exportcert -alias herong_key -keypass keypass \
   -keystore herong.jks -storepass jkspass -file herong.crt -rfc

Certificate stored in file <herong.crt>

herong> more herong.crt
-----BEGIN CERTIFICATE-----
MIIDODCCAvagAwIBAgIERqplETALBgcqhkjOOAQDBQAwfzELMAkGA1UE...
...
Cgfs2kXj/IQCFDC5GT5IrLTIFxAyPUo1tJo2DPkK
-----END CERTIFICATE-----

Cool. A certificate was exported. I am not going to explain all the command options used above, because they were explained in previous chapters. But I want to mention this "-rfc" option:

Without "-rfc" option, "keytool" will output certificate in a binary form, which will be very hard to transfer.

I got this certificate exported from the PrivateKeyEntry of my key pair. What is in this certificate? I will try to use "keytool -printcert" command to look into this certificate 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

 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

 No "keytool" Command to Export Keys

 "keytool -genkeypair" Generating PrivateKeyEntry

►"keytool -exportcert" Exporting PrivateKeyEntry

 "keytool -printcert" Printing Certificate Details

 "openssl x509" Viewing Certificate Details

 "DumpKey.java" Dumping Private Keys Out of "keystore"

 "openssl enc" Converting Keys from Binary to PEM

 "openssl dsa" Viewing Private and Public Key Pair

 Certificate X.509 Standard and DER/PEM Formats

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

 Using Certificates in IE

 Using Certificates in Google Chrome

 Using Certificates in Firefox

 Archived Tutorials

 References

 Full Version in PDF/EPUB