Cryptography Tutorials - Herong's Tutorial Examples

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

∟"keytool -printcert" Printing Certificate Details

This section provides a tutorial example on how to print details of the certificate exported by 'keytool -exportcert' command using the 'keytool -printcert' command.

With the "keytool -exportcert" command, I got a certificate, herong.crt, exported from the PrivateKeyEntry of my key pair. Now I want see some details of this certificate with the "keytool -printcert" command as shown below: 

herong> keytool -printcert -file herong.crt

Owner: CN=Herong Yang, OU=Herong Unit, O=Herong Company, 
L=Herong City, ST=Herong State, C=CA
Issuer: CN=Herong Yang, OU=Herong Unit, O=Herong Company, 
L=Herong City, ST=Herong State, C=CA
Serial number: 46aa6511
Valid from: Sun Apr 1 17:35:13 EDT 2007 
until: Sat Jun 30 17:35:13 EDT 2007
Certificate fingerprints:
         MD5:  0C:54:AE:99:4E:3D:F7:A9:79:1A:93:83:0F:EF...
         SHA1: CA:23:1C:D4:F9:74:84:4C:16:F7:E7:AB:B1:08...
         Signature algorithm name: SHA1withDSA
         Version: 3

OK. Now I know that:

After this test, I read the Java manual again. It explains what exactly "keytool -genkeypair" does clearly: "Generates a key pair (a public key and associated private key). Wraps the public key into an X.509 v3 self-signed certificate, which is stored as a single-element certificate chain. This certificate chain and the private key are stored in a new keystore entry identified by alias."

So the "PrivateKeyEntry" in the keystore file has two components: my key pair and my self-signed public key certificate.

The "keytool -exportcert" command only exports the self-signed certificate. The key pair will not be exported.

The next question is that could this certificate generated by "keytool" be viewed by "OpenSSL"? See the next section for answers.

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