"keytool" Importing Certificates in DER and PEM

This section provides a tutorial example on how to use 'keytool' to import certificates in DER and PEM formats generated by 'OpenSSL' into 'keystore' files.

I also tried to import the certificate generated by "OpenSSL" into "keytool" keystore files. The "keytool -importcert" command had no trouble reading the certificate in both PEM and DER formats. My command session is recorded here:

>keytool -importcert -file openssl_crt.pem
-keystore herong.jks -storepass jkspass 
-alias openssl_crt_pem -keypass keypass

Owner: EMAILADDRESS=herongyang.com, CN=Herong Yang, OU=HY Unit, ...
Issuer: EMAILADDRESS=herongyang.com, CN=Herong Yang, OU=HY Unit, ...
Serial number: 0
Valid from: Sun Apr 1 13:02:22 EDT 2007 until: ...
Certificate fingerprints:
         MD5:  BF:B8:3A:19:E5:05:CE:CA:8C:F7:05:FA:FE:51:A6:EC
         SHA1: F7:C7:2A:57:73:5E:CE:E5:73:09:13:35:FB:91:CF:27:...
         Signature algorithm name: MD5withRSA
         Version: 3

Extensions:
...
Trust this certificate? [no]:  yes
Certificate was added to keystore

>keytool -importcert -file openssl_crt.der
-keystore herong.jks -storepass jkspass 
-alias openssl_crt_der -keypass keypass

Certificate already exists in keystore under alias <openssl_crt_pem>
Do you still want to add it? [no]:  yes
Certificate was added to keystore

>keytool -list -keystore herong.jks -store
pass jkspass

Keystore type: JKS
Keystore provider: SUN

Your keystore contains 3 entries

openssl_crt_der, Apr 1, 2007, trustedCertEntry,
Certificate fingerprint (MD5): BF:B8:3A:19:E5:05:CE:CA:8C:F7:05:...
openssl_crt_pem, Apr 1, 2007, trustedCertEntry,
Certificate fingerprint (MD5): BF:B8:3A:19:E5:05:CE:CA:8C:F7:05:...
herong_key, Apr 1, 2007, PrivateKeyEntry,
Certificate fingerprint (MD5): 5B:44:F1:D7:3D:9F:9E:15:5B:D1:25:...

Wonderful! There was no trouble at all for "keytool" to import my self-signed certificate generated by "OpenSSL" into the keystore file in both DER and PEM formats.

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