Greetings,
We use a TPM2 device to generate private keys with tpm2-tss-engine: https://github.com/tpm2-software/tpm2-tss-engine While attempting to extract the public key from a TSS2 private key using OpenSSL 3.0.0-beta2 and tpm2-tss-engine, I received a message "PEM format not supported": openssl rsa -engine libtpm2tss -inform engine -in privkey.pem -pubout -outform PEM -out pubkey.pem Engine "tpm2tss" set. writing RSA key PEM format not supported Although it is recommended to use providers instead of engines with OpenSSL 3.0.0, are engines still supported? Should the above operation be expected to work? Here is an example of a private key was generated with tpm2-tss-engine's tpm2tss-genkey: -----BEGIN TSS2 PRIVATE KEY----- MIIB8gYGZ4EFCgEDoAMBAQECBEAAAAEEggEYARYAAQALAAYEcgAAABAAEAgAAAEA AQEAmT8O+ikRX5eTRUsDXrBAephW1YLEITkKxviFzIxF7R1K1jlDIXI8PKhc6tUE sEDfgTNtldmc3nxPmJBxeAzIQrGAAUjGY74xtvbe6T6muU9FHGVpw1e3LelewFCQ yR+t36GaOBY+S4Bc0DC0KhSoFakiwYt2vtQvm0W54cwxg7B4aSfcBUNHFPB5J90c ere/o20QpNvb7mw/kwvoTSzsyQT5qMZALKZeRFZ42991dGWJpnfC30xieXCMoD7z x5hhc5Uf5EbFtxeWaT2HTfs0h0OxigQSjXdmCJPeJVoMPOoF2FK+PbZwPn2UDKyo SqhsmZ+9hvkUWylDYiXfm24TUwSBwAC+ACDJpk4p0h4Q3UEtwph3oNy5xR7hya4S XHqabuThC+xX1AAQDTukmp9lruULdnZALN1Lyw1AMw+7F2BBx786jjOmg9rX+umB ffGZSs187UAjmfe98XUk9oNsZkgB7HEsDRIOXoET+9R0KI48whV3Z/Kwag+UmErL KRTOl5zEUenbQi8/CBDVpuxKMyKl6tYc38iNh2rA8Eju9tv+x6kPv/5/JxmXSpgQ rCSHxBQFxnnITejU/RMqCHMZpCly2A== -----END TSS2 PRIVATE KEY----- If I use instead the TPM2 provider tpm2-openssl https://github.com/tpm2-software/tpm2-openssl the command openssl rsa -provider tpm2 -in privkey.pem -pubout -outform PEM -out pubkey.pem works, producing: -----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmT8O+ikRX5eTRUsDXrBA ephW1YLEITkKxviFzIxF7R1K1jlDIXI8PKhc6tUEsEDfgTNtldmc3nxPmJBxeAzI QrGAAUjGY74xtvbe6T6muU9FHGVpw1e3LelewFCQyR+t36GaOBY+S4Bc0DC0KhSo FakiwYt2vtQvm0W54cwxg7B4aSfcBUNHFPB5J90cere/o20QpNvb7mw/kwvoTSzs yQT5qMZALKZeRFZ42991dGWJpnfC30xieXCMoD7zx5hhc5Uf5EbFtxeWaT2HTfs0 h0OxigQSjXdmCJPeJVoMPOoF2FK+PbZwPn2UDKyoSqhsmZ+9hvkUWylDYiXfm24T UwIDAQAB -----END PUBLIC KEY----- Thank you, Nestor Melo
