I can`t remember anything, so I’m recording

CER/DER to PEM, extracting key from certificate

openssl commands
working with certificates

extraction key from cert(if it is allowed):

openssl pkcs12 -in CertificateWithKey.pfx -out EncryptedCertificateKEY.key

decrypting key:

openssl rsa -in EncryptedCertificateKEY.key -out UNEncryptedCertificateKEY.key

convert cer to pem:

openssl x509 -inform der -in Certificate.cer -out Certificate.pem

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