No Certificate Matches Private Key

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I got this error trying to generate a .pfx file from a newly received certificate. The error scared me a little cause I was absolutely sure I tried to match the correct private key with the certificate.
Where it went wrong in this case was the export of the .cer file. I received a .p7b file from Verisign which contains my certificate plus the Verisign Root and Sub certs. From the .p7b file I chose to export my certificate
Now when you chose to export to DER format you will get your No Certificate Matches Private Key error. You need to chose to export to BASE64 to get it to work.
Chosing the right format will solve this problem and you can bundle your private key and public key in a .pfx file. Alternatively you can use OpenSSL to convert your DER certificate to an x509 certificate with the following command
openssl x509 -inform der -in MYCERT.cer -out MYCERT.pem
Then you can use the .pem file to create the .pfx
openssl pkcs12 -export -in cert.cer -inkey privkey.pem -out mycert.pfx
Thank you! I had the same problem. Your solution works like a charm.
Worked for me too. Thank you very much.
This solution doesn’t seem to work for me at all. Getting the same error.
Thanks for your reply. The error can ofcourse have multiple causes. The private key cannot match because of a format error like I described in this article. Or just that the private key does not correspond to the supplied public key.
If you like I can have look at your certs if you send them to support (@) markbrilman (.) nl . But I do need both the private key and the public key. I can imagine it’s not option to send them.
I have the same message/error when I attempt to create a PKS files to import into IIS.
I have export the key and signed cert and convert into PEM and run the same command that you use OpenSSL and I get this error when the CSR is signed with a Win 2008 CA but not when the CSR is signed with a Win 2012 CA.
I have tried several attempts to figure out why, have you come across this ?
That’s strange. Did you figure this one out?
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I spent all day trying to convert a .pem file to a .p12, with no sucess. Can you help me, please?
That's how i have been doing: 1) openssl genrsa -out mykey.key 2048
2) openssl req -new -key mykey.key -out CertificateSigningRequest.certSigningRequest -subj "/(...), CN=(...), C=(..)"
3) openssl x509 -in ios_development.cer -inform DER -out developer_identity.pem -outform PEM
4) openssl pkcs12 -export -inkey mykey.key -in developer_identity.pem -out ios_development.p12
Result: No certificate matches private key (in step 4)
Pickabull
Pickabull 55●22 silver badges●66 bronze badges
how have you got ios_development.cer from file CertificateSigningRequest.certSigningRequest ? – pedrofb Feb 7 '17 at 8:15
Yes, i have two ios_development.cer and none works. In step 2, you must see written on cmd "loading screen into random state - done" and i don't see it. Could that be related? – Pickabull Feb 7 '17 at 10:32
In step 2 you have generated a CertificateSigningRequest (usually the suffix of the file is .csr, but you called it .certSigningRequest). This file must be sent to the Certification Authority. The CA generates and signs a certificate and returns you a .cer. This step is not included in your question – pedrofb Feb 7 '17 at 10:39
Ok, first of all, thank you for the help. So, is the code rigth? All that could be wrong is the .cer? – Pickabull Feb 7 '17 at 10:41
So, just to be sure: 1) I generate a private key 2) I create the .csr 3) I upload .csr and download the .cer 4) I Convert .cer in .pem 5) Finally, i get the .p12 with the key submitted in step 2 (and uploaded to CA). Am i rigth? – Pickabull Feb 7 '17 at 14:30
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