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$ openssl rsa -pubout < [秘密鍵]
下記の公開鍵が合致してればOK
# openssl rsa -in /etc/pki/tls/certs/server.key -pubout writing RSA key -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC/smbmb0cX7DLKTTtDrbAEcORd RKwFLXB4kysLD5M8rdZ7mrKatJxkJy0G1zTaGGgRRn4vnK9gpAiG1st8JLEtV3H3 8RWbS14che8EmuKNn4U5pf6M67d68V9eMsBKFAERTWHGihoVGQ04rflzoaegdjQA 5dmU5eL0l8ktANsZ5QIDAQAB -----END PUBLIC KEY-----
# openssl x509 -in /etc/pki/tls/certs/server.crt -pubkey -----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC/smbmb0cX7DLKTTtDrbAEcORd RKwFLXB4kysLD5M8rdZ7mrKatJxkJy0G1zTaGGgRRn4vnK9gpAiG1st8JLEtV3H3 8RWbS14che8EmuKNn4U5pf6M67d68V9eMsBKFAERTWHGihoVGQ04rflzoaegdjQA 5dmU5eL0l8ktANsZ5QIDAQAB -----END PUBLIC KEY----- -----BEGIN CERTIFICATE----- MIIDcTCCAtqgAwIBAgIBADANBgkqhkiG9w0BAQUFADCBiDELMAkGA1UEBhMCSkEx EDAOBgNVBAgTB1RvdWt5b3UxEjAQBgNVBAcTCVR5dXVvdS1rdTEWMBQGA1UEChMN RmxhdEVpZ2h0LmNvbTEYMBYGA1UEAxMPd3d3LmZsYXQ4LmNvLmpwMSEwHwYJKoZI hvcNAQkBFhJtYXRzdWlAZmxhdDguY28uanAwHhcNMTAwNDI3MDIwODA4WhcNMjAw NDI0MDIwODA4WjCBiDELMAkGA1UEBhMCSkExEDAOBgNVBAgTB1RvdWt5b3UxEjAQ BgNVBAcTCVR5dXVvdS1rdTEWMBQGA1UEChMNRmxhdEVpZ2h0LmNvbTEYMBYGA1UE AxMPd3d3LmZsYXQ4LmNvLmpwMSEwHwYJKoZIhvcNAQkBFhJtYXRzdWlAZmxhdDgu Y28uanAwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAL+yZuZvRxfsMspNO0Ot sARw5F1ErAUtcHiTKwsPkzyt1nuaspq0nGQnLQbXNNoYaBFGfi+cr2CkCIbWy3wk sS1XcffxFZtLXhyF7wSa4o2fhTml/ozrt3rxX14ywEoUARFNYcaKGhUZDTit+XOh p6B2NADl2ZTl4vSXyS0A2xnlAgMBAAGjgegwgeUwHQYDVR0OBBYEFOoA+LP6/ew0 dD+cHN1/ddKZxlooMIG1BgNVHSMEga0wgaqAFOoA+LP6/ew0dD+cHN1/ddKZxloo oYGOpIGLMIGIMQswCQYDVQQGEwJKQTEQMA4GA1UECBMHVG91a3lvdTESMBAGA1UE BxMJVHl1dW91LWt1MRYwFAYDVQQKEw1GbGF0RWlnaHQuY29tMRgwFgYDVQQDEw93 d3cuZmxhdDguY28uanAxITAfBgkqhkiG9w0BCQEWEm1hdHN1aUBmbGF0OC5jby5q cIIBADAMBgNVHRMEBTADAQH/MA0GCSqGSIb3DQEBBQUAA4GBAD5mWuFfXRZAXzXc iGsAY4oS1tQHl9NVGkEy7BF8lRNc7gLZjyxgApq6OcULUuPGALQcHCxOTHNLvQU+ AeKfYDuOKrjZxXnHS/+V5iM9hq+WoeAnZpkfA3MW7qdDlkC3L+/bqcZNvF0/Jlnc U19qc1XDEGuVRTBgaJtk+XKwC+QO -----END CERTIFICATE-----
$ ssh-keygen -y -f .ssh/id_rsa
下記の2つが、合致すればOKです。
$ ssh-keygen -y -f .ssh/id_rsa ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA5ezNi1WjzrrsBV3tJXkqQq5I6UIrXbIAR7MnzOgNXe0GROF0B6U0/JO4HB8uKWQOmdeEdG6O8fmq2r0tp30DON7PUTIY7jq+/Vx35fu70v+6snAd9B8TGReum1bGhRkLsuupSqD8UiDkKMiNzn1ZXNAglYNRVmtAEnLmHGOx6c4KrGI7u/2cIKk7l4SFqaa4+LwdDJmjaq85oSXFteTsDJnxs58gG5QjsUtCm+AvtT/hM6XUZ2mSIowz0cw+ZSc2n6LPMVNq39iSjWUn29yevy/n5zEp5yAC/JSGltZlO6jB23bLJwjni20avIwUtpi4ROxT4I5JTjbP9qshjUWqjw==
$ cat .ssh/id_rsa.pub ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA5ezNi1WjzrrsBV3tJXkqQq5I6UIrXbIAR7MnzOgNXe0GROF0B6U0/JO4HB8uKWQOmdeEdG6O8fmq2r0tp30DON7PUTIY7jq+/Vx35fu70v+6snAd9B8TGReum1bGhRkLsuupSqD8UiDkKMiNzn1ZXNAglYNRVmtAEnLmHGOx6c4KrGI7u/2cIKk7l4SFqaa4+LwdDJmjaq85oSXFteTsDJnxs58gG5QjsUtCm+AvtT/hM6XUZ2mSIowz0cw+ZSc2n6LPMVNq39iSjWUn29yevy/n5zEp5yAC/JSGltZlO6jB23bLJwjni20avIwUtpi4ROxT4I5JTjbP9qshjUWqjw== matsui@dadm0002
openssl genrsa -aes256 2048 > private.key
$ openssl genrsa 2048 > private.key
$ ssh-keygen -y -f private.key > public.key
$ mkdir ~/.ssh $ cp private.key ~/.ssh/id_rsa && chmod 600 ~/.ssh/id_rsa $ cp public.key ~/.ssh/id_rsa.public
