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generate pem from keypair, and sign message

openssl rsa -in id_rsa -outform pem > id_rsa.pem
openssl rsa -in id_rsa -pubout -out id_rsa.pub.pem
openssl dgst -sha256 -sign ~/.ssh/id_rsa.pem -out signature.data message
openssl dgst -sha256 -verify ~/.ssh/id_rsa.pub.pem -signature signature.data message

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