How to convert a .cer file to .p12 without the keychain password? I have to "codesign" a distribution certificate inside a .ipa file to deploy an in-house application for a company. 

I have access to their developer account. The new provisioning profile had been successfully added at this point and then:


I download the .cer file from the company developer account
Add it to my keychain by double click on it
Right click on the certificate to export it to a .p12 file...


At this point, the option to export the file to .p12 is greyed out. I have looked for many way to do it on the web but I am still stuck. 

I have no access to the keychain password of the file. 

Do I have to recreate a certificate from my mac to get keychain access to it?

What is the right way to have this certificate as a .p12 file, ready to be codesign to my .ipa file using this command line?

codesign -f -s "iPhone Distribution: Company Name" Payload/MyApp.app
Private Key

You will need the password for the Keychain to export the private key associated with the certificate.

Alone the certificate can not be used to sign. You need the private key as well.

The private key was probably created along with the original CSR (certificate signing request) sent to Apple. By default, the private key is stored in the user's Keychain.


The certificate is public and often stored in an unencrypted .pem file.
The key is private and often stored in the Keychain or an encrypted .p12 file.


New Certificate and Key

You can ask Apple for a new signing certificate, using a new private key and CSR. This does not require administrator access or access to the existing Keychain. You will need access to the online Apple Developer account of the company.

As a precaution, consider creating a separate Keychain for the company - marked as Default while creating the CSR. The private key will then be saved into the separate Keychain and can be passed to codesign as an absolute path with the --keychain flag. You can also store the certificate in this Keychain file.