On 14/08/2019 11:06, Robert Moskowitz wrote: > I googled how to convert a PEM public key to DER and only found examples for RSA > keys. Mine are ed25519. I thought it would be a simple algorithm substitution: > > $ openssl ed25519 -pubin -inform PEM -in $dir/private/intermediate.key.pem\ >> -outform DER -out $dir/private/intermediate.key.der > > Invalid command 'ed25519'; type "help" for a list. > > So since my other commands use -algorithm, I tried: > > $ openssl -algorithm $algorithm -pubin -inform PEM -in > $dir/private/intermediate.key.pem\ >> -outform DER -out $dir/private/intermediate.key.der > > Invalid command '-algorithm'; type "help" for a list. > > So what is the command to convert an ed25519 public key from DER to PEM. The > command I used to create the key was: > > openssl genpkey -aes256 -algorithm ed25519\ > -outform pem -out $dir/private/intermediate.key.pem Firstly, that command creates a private key not a public key. So if you want to convert the above *private* key into DER then: openssl pkey -in ed25519.pem -out ed25519.der -outform DER If on the other hand you want to read the above *private* key and output the associated *public* key in DER then: openssl pkey -in ed25519.pem -out ed25519-pub.der -outform DER -pubout Matt
