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Created August 12, 2020 23:00
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Creating a PKCS#12 file from a Let's Encrypt certificate
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howto.md

Assuming you received the certificate in DER form, saved to cert.der:

openssl x509 -inform der -in cert.der -out chain.pem

Append the content of https://letsencrypt.org/certs/lets-encrypt-x1-cross-signed.pem.txt to chain.pem.

Save https://letsencrypt.org/certs/letsencryptauthorityx1.pem.

Assuming the private key for the certificate is in privkey.pem:

openssl pkcs12 -export -inkey privkey.pem -in chain.pem -CAfile letsencryptauthorityx1.pem -out cert.p12

cert.p12 now includes the private key, your certificate, and the full certificate chain.

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