OpenSSL origina at: https://code.google.com/archive/p/apns-sharp/wikis/HowToCreatePKCS12Certificate.wiki Here is how to create a PKCS12 format file using open ssl, you will need your developer private key (which can be exported from the keychain) and the CertificateSigningRequest??.certSigningRequest
- Convert apn_developer_identity.cer (der format) to pem:
openssl x509 -in apn_developer_identity.cer -inform DER -out apn_developer_identity.pem -outform PEM
- Next, Convert p12 private key to pem (requires the input of a minimum 4 char password):