How Generate A Private Key That Matches A Public Key

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  1. Generate Private Key File
  2. How Generate A Private Key That Matches A Public Key Location
  3. How Generate A Private Key That Matches A Public Keyboard

How do I verify that a private key matches a certificate?

Generate Private Key File

To verify that an RSA private key matches the RSA public key in a certificate you need to i) verify the consistency of the private key and ii) compare the modulus of the public key in the certificate against the modulus of the private key.

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. A private key should never be sent to another party. It is private. If this is the first time you are using public keys, we recommend the page Public keys in SSH. Generate public/private keypair. To use public key authentication, the client from which you are connecting needs to have a public/private keypair. To generate a keypair using Bitvise.

To verify the consistency of the RSA private key and to view its modulus:
openssl rsa -modulus -noout -in myserver.key openssl md5
openssl rsa -check -noout -in myserver.key openssl md5
RSA Key is ok
If it doesn't say 'RSA key ok', it isn't OK!'

To view the modulus of the RSA public key in a certificate:
openssl x509 -modulus -noout -in myserver.crt openssl md5

If the first commands shows any errors, or if the modulus of the public key in the certificate and the modulus of the private key do not exactly match, then you're not using the correct private key. You can either create a brand new key and CSR and contact support, or you can do a search for any other private keys on the system and see if they match.

To search for all private keys on your server:
find / -name *.key
If you are unable to find the private key that corresponds to your certificate, you will need a replacement certificate. Please contact support.

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.

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:

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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.

How Generate A Private Key That Matches A Public Key Location

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.

How Generate A Private Key That Matches A Public Keyboard

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