I created a public and private key running ssh-keygen -t rsa -b 4096.
I then created a DNS entry dkim._domainkey of type TXT with this value:
v=dkim1; p=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
Now when I test it using https://protodave.com/tools/dkim-key-checker/ it says:
Unable to properly parse the public key string and determine key length or the key is invalid. Tip: Make sure there aren't any special charaters or newlines pasted into your key in the TXT record.
I just copy pasted the complete key out of the file that was generated by ssh-keygen. Any tips on how I can figure out what went wrong?
I used openssl genrsa -out openssl.priv 1024 and openssl rsa -in openssl.priv -pubout >openssl.pub to generate the keys and now it works just fine.