Replace .p12 certificate

• 1) openssl genrsa -aes256 -out ./my_new_key.pem 2048
• 2) openssl req -new -key my_new_key.pem -out my_new_csr.csr
• 3) Convert .cer to .pem: openssl x509 -inform der -in my_new_cert.cer -out my_new_cert.pem
• 4) Generate .p12: openssl pkcs12 -export -out keyStore.p12 -inkey my_new_key.pem -in my_new_cert.pem

Note: to replace .p12 certificates in OneSignal select always: Apple Push Notification service SSL (Sandbox & Production)

Related

• .p12
• .cer
• OneSignal
• APNs: Apple Push Notification service SSL (Sandbox)
• APNs: Apple Push Notification service SSL (Sandbox & Production)

See also

• Certificate, CSR (PKCS10), /etc/letsencrypt/csr/, openssl req, X.509, [.pem, .cer, .csr], Kubernetes CertificateSigningRequest