Generating a KeyStore and TrustStore

1. Generate Public Key From Pem File Java Software
2. Generate Private Key From Pem
3. Generate Public Key From Pem File Java File

Oct 02, 2019  Yes, I want to generate key files from scratch, but I need both a private and public key. Essentially what I need is to replicate this openssl sequence which results in a private key pem and a public key pem: openssl genpkey -algorithm RSA -out rsaprivate.pem -pkeyopt rsakeygenbits:2048 openssl rsa -in rsaprivate.pem -pubout -out rsapublic.pem.

The following sections explain how to create both a KeyStoreand a TrustStore (or import a certificate into an existing TrustStoresuch as the default Logical Host TrustStore in the location:

Generate Public Key From Pem File Java Software

Jun 18, 2014 In Java generating public private key using RSA algorithm is quite easy as it provides lib to do these tasks. In Java java.security package contains classes to do these operation. Generating public private key pairs By using KeyPairGenerator class we can generate public/private key pairs as given below. Is there any tool to generate a.pem public key file from known rsa public key values? I have the rsa public key values and the exponent, they are in. Oct 31, 2013 You have a PGP public in PEM format, which cannot be stored in a Java key store. But you have the PEM encoded public key file. This class reads the file and creates a public key class in Java. Generate a private-public key pair using keytool. Save/Load Private and Public Key to/from a file. Package net.java.edem. I am trying to connect to an SSL server which requires me to authenticate myself. In order to use SSL over Apache MINA I need a suitable JKS file. However, I have only been given a.PEM file. Openssl genrsa -out privatekey.pem 4096: openssl rsa -pubout -in privatekey.pem -out publickey.pem # convert private key to pkcs8 format in order to import it from Java: openssl pkcs8 -topk8 -in privatekey.pem -inform pem -out privatekeypkcs8.pem -outform pem -nocrypt.

where <c:JavaCAPS> isthe directory where Java CAPS is installed and <MyDomain> isthe name of your domain. The primary tool used is keytool, but openssl isalso used as a reference for generating pkcs12 KeyStores.

For more information on openssl andavailable downloads, visit the following web site:

http://www.openssl.org.

Creating a KeyStore in JKS Format

This section explains how to create a KeyStore using theJKS format as the database format for both the private key, and theassociated certificate or certificate chain. By default, as specifiedin the java.security file, keytool usesJKS as the format of the key and certificate databases (KeyStore andTrustStores). A CA must sign the certificate signing request (CSR).The CA is therefore trusted by the server-side application to whichthe Adapter is connected.

Itis recommended to use the default KeyStore

where <c:JavaCAPS> isthe directory where Java CAPS is installed and <MyDomain> isthe name of your domain.

To Generate a KeyStore

1. Perform the following command.

2. Once prompted, enter the information required to generatea CSR. A sample key generation section follows.

   If the KeyStore password is specified, then the password mustbe provided for the adapter.

3. Press RETURN when prompted for the key password (thisaction makes the key password the same as the KeyStore password).

   This operation creates a KeyStore file clientkeystore in the current working directory. You must specify a fullyqualified domain for the “first and last name” question.The reason for this use is that some CAs such as VeriSign expect thisproperties to be a fully qualified domain name.

   Thereare CAs that do not require the fully qualified domain, but it isrecommended to use the fully qualified domain name for the sake ofportability. All the other information given must be valid. If theinformation cannot be validated, a CA such as VeriSign does not signa generated CSR for this entry.

   This KeyStore containsan entry with an alias of client.This entry consists of the generated private key and information neededfor generating a CSR as follows:

   This command generates a certificate signing request which canbe provided to a CA for a certificate request. The file client.csr contains the CSR in PEM format.

   Some CA (one trusted by the web server to which the adapteris connecting) must sign the CSR. The CA generates a certificate forthe corresponding CSR and signs the certificate with its private key.For more information, visit the following web sites:

   or

   If the certificate is chained with the CA’scertificate, perform step 4; otherwise, perform step 5 in the followinglist:

4. Perform the following command.

   The command imports the certificate and assumes the client certificateis in the file client.cer and theCA’s certificate is in the file CARoot.cer.

5. Perform the following command to import the CA’scertificate into the KeyStore for chaining with the client’scertificate.

6. Perform the following command to import the client’scertificate signed by the CA whose certificate was imported in thepreceding step.

   The generated file clientkeystore containsthe client’s private key and the associated certificate chainused for client authentication and signing. The KeyStore and/or clientkeystore, can then be used as the adapter’sKeyStore.

Creating a KeyStore in PKCS12 Format

This section explains how to create a PKCS12 KeyStoreto work with JSSE. In a real working environment, a customer couldalready have an existing private key and certificate (signed by aknown CA). In this case, JKS format cannot be used, because it doesnot allow the user to import/export the private key through keytool. It is necessary to generate a PKCS12database consisting of the private key and its certificate.

The generated PKCS12 database can then be used as the Adapter’sKeyStore. The keytool utility iscurrently lacking the ability to write to a PKCS12 database. However,it can read from a PKCS12 database.

There are additional third-party tools available for generatingPKCS12 certificates, if you want to use a different tool.

For the following example, openssl isused to generate the PKCS12 KeyStore:

The existing key is in the file mykey.pem.txt in PEM format. The certificate is in mycertificate.pem.txt, which is also in PEM format. A textfile must be created which contains the key followed by the certificateas follows:

This command prompts the user for a password. The password isrequired. The KeyStore fails to work with JSSE without a password.This password must also be supplied as the password for the Adapter’sKeyStore password.

This command also uses the openssl pkcs12 commandto generate a PKCS12 KeyStore with the private key and certificate.The generated KeyStore is mykeystore.pkcs12 withan entry specified by the myAlias alias.This entry contains the private key and the certificate provided bythe -in argument. The noiter and nomaciter optionsmust be specified to allow the generated KeyStore to be recognizedproperly by JSSE.

Creating a TrustStore

For demonstration purposes, suppose you have the followingCAs that you trust: firstCA.cert, secondCA.cert,thirdCA.cert, located in the directory C:cascerts. You can create a new TrustStore consistingof these three trusted certificates.

To Create a New TrustStore

Generate Private Key From Pem

1. Perform the following command.

2. Enter this command two more times, but for the secondand third entries, substitute secondCA and thirdCA for firstCA.Each of these command entries has the following purposes:

   • The first entry creates a KeyStore file named myTrustStore in the current working directoryand imports the firstCA certificateinto the TrustStore with an alias of firstCA.The format of myTrustStore is JKS.

   • For the second entry, substitute secondCA to import the secondCA certificateinto the TrustStore, myTrustStore.

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   • For the third entry, substitute thirdCA to import the thirdCA certificateinto the TrustStore.

   Once completed, myTrustStore is available to be used as theTrustStore for the adapter.

Generate Public Key From Pem File Java File

Now that you have generated a signature for some data, you need to save the signature bytes in one file and the public key bytes in another so you can send (via modem, floppy, mail, and so on) someone else

• the data for which the signature was generated,
• the signature, and
• the public key

The receiver can verify that the data came from you and was not modified in transit by running the VerSig program you will generate in the upcoming Verifying a Digital Signature steps. That program uses the public key to verify that the signature received is the true signature for the data received.

Recall that the signature was placed in a byte array named realSig. You can save the signature bytes in a file named sig via the following.

Recall from the Generate Public and Private Keys step that the public key was placed in a PublicKey object named pub. You can get the encoded key bytes by calling the getEncoded method and then store the encoded bytes in a file. You can name the file whatever you want. If, for example, your name is Susan, you might name it something like suepk (for 'Sue's public key'), as in the following: