You can use this Certificate Key Matcher to check whether a private key matches a certificate or whether a certificate matches a certificate signing request (CSR). When you are dealing with lots of different certificates it can be easy to lose track of which certificate goes with which private key or which CSR was used to generate which certificate. The Certificate Key Matcher tool makes it easy to determine whether a private key matches or a CSR matches a certificate.

1. Generate Public Key From Private
2. Generate Private Key From Crt File
3. Get Private Key From Crt

The certificate and private key can be installed on your web server which will provide data encryption. More information can be found in the tutorial Installing Apache 2 and SSL on Windows XP. To verify if the generated SSL certificate contains the correct information, use the online decode SSL certificate tool. Back Up Private Key. To backup a private key on Microsoft IIS 6.0 follow these instructions: 1. From your server, go to Start Run and enter mmc in the text box. If you can't locate your private key, you can generate a new CSR and then rekey your GoDaddy certificate to continue the installation process. Get Private key from SSL Certificate. Save as something.key and upload with GD crt and crt bundle.

The Certificate Key Matcher simply compares a hash of the public key from the private key, the certificate, or the CSR and tells you whether they match or not. You can check whether a certificate matches a private key, or a CSR matches a certificate on your own computer by using the OpenSSL commands below:

Generate Public Key From Private

openssl pkey -in privateKey.key -pubout -outform pem sha256sum
openssl x509 -in certificate.crt -pubkey -noout -outform pem sha256sum
openssl req -in CSR.csr -pubkey -noout -outform pem sha256sum

Your private key is intended to remain on the server. While we try to make this process as secure as possible by using SSL to encrypt the key when it is sent to the server, for complete security, we recommend that you manually check the public key hash of the private key on your server using the OpenSSL commands above.

You can also do a consistency check on the private key if you are worried that it has been tampered with. See Hanno Böck's article How I tricked Symantec with a Fake Private Key for how to do this and when this might be useful.

Generate Private Key From Crt File

Get Private Key From Crt

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