Generate Public Key From Pem File Java

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  1. How To Generate Pem File
  2. Generate Public Key From Pem File Java Pdf
  3. Generate Public Key From Pem File Java Code
  4. Generate Public Key From Pem File Java Software

Next, VerSig needs to import the encoded public key bytes from the file specified as the first command line argument and to convert them to a PublicKey. A PublicKey is needed because that is what the SignatureinitVerify method requires in order to initialize the Signature object for verification.

May 08, 2011 The Java keystore format won’t work with Apache, however, so I needed a way to export the certificate and private key from the Java keystore we used for Tomcat and import it to a new PEM file so I can use it with Apache. (Java) Generate RSA Public/Private Key Pair and Export to PEM. Java example code showing how to generate an RSA public/private key pair and export to PEM files. Chilkat Java Downloads. Java Libs for Windows, Linux, Alpine Linux, MAC OS X, Solaris, FreeBSD, OpenBSD. 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. Nov 25, 2019  See the Stack Overflow link above about using the PEM file with Java KeyStore if you want to convert the file to JKS, or this tutorial from Oracle to import the file into the Java truststore. More Information on PEM. 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.

First, read in the encoded public key bytes.

Now the byte array encKey contains the encoded public key bytes.

You can use a KeyFactory class in order to instantiate a DSA public key from its encoding. The KeyFactory class provides conversions between opaque keys (of type Key) and key specifications, which are transparent representations of the underlying key material. With an opaque key you can obtain the algorithm name, format name, and encoded key bytes, but not the key material, which, for example, may consist of the key itself and the algorithm parameters used to calculate the key. (Note that PublicKey, because it extends Key, is itself a Key.)

So, first you need a key specification. You can obtain one via the following, assuming that the key was encoded according to the X.509 standard, which is the case, for example, if the key was generated with the built-in DSA key-pair generator supplied by the SUN provider:

Now you need a KeyFactory object to do the conversion. That object must be one that works with DSA keys.

Finally, you can use the KeyFactory object to generate a PublicKey from the key specification.

Generating a KeyStore and TrustStore

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:


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.

DownloadGenerate Public Key From Pem File JavaNote –

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.

How To Generate Pem File

Note –

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

Generate Public Key From Pem File Java Pdf

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.

Generate Public Key From Pem File Java Code

To Create a New TrustStore

Generate Public Key From Pem File Java Software

  1. Autocad 2010 product key generator download. 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.

    • 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.