NAME

       pvsecret verify - Verify that an add-secret request is sane

SYNOPSIS

       pvsecret verify [OPTIONS] <FILE>

DESCRIPTION

       Verifies that the given request is an Add-Secret request by testing for some values to be
       present. If the request contains signed user-data, the signature is verified with the
       provided key. Outputs the arbitrary user-data. All data in the request is in big endian.

       verify checks the following:

              • The first 6 bytes of the request are equal to: 6173 7263 624d | asrcbM

              • The sizes in the request header are sane and do not point out of the file

              • The request version is supported by the binary

              • If user-data contains a signature, verify the signature using a public key

       The content of bytes 6&7 of the request define which kind of user-data the request
       contains.

       0x0000  no user-data (512 bytes zero)

       0x0001  512 bytes user-data

       0x0002  265 bytes user-data| 139 bytes ecdsa signature | 5 bytes reserved | 2 bytes
               signature size | ...

       0x0003  256 bytes user-data | 256 bytes rsa2048 signature

       0x0004  128 bytes user-data | 384 bytes rsa3072 signature

       The actual user-data may be less than the capacity. If less data was provided during
       create zeros are appended.  For type 2-4 The signature is calculated as follows:

              1. The request is generated with the user-data in place and zeros for the signature
                 data.

              2. The signature is calculated for the request. The signature signs the
                 authenticated data and the encrypted data, but not the request tag. I.e. the
                 signature signs the whole request but the last 16 bytes and with the signature
                 bytes set to zero.

              3. The signature is inserted to its location in the request.

              4. The request GCM tag is calculated.

       The verification process works as follows:

              1. copy the signature to a buffer

              2. overwrite the signature with zeros

              3. verify the signature of the request but the last 16 bytes

OPTIONS

       <FILE>
           Specify the request to be checked.

       --user-cert <FILE>
           Certificate containing a public key used to verify the user data signature.  Specifies
           a public key used to verify the user-data signature. The file must be a X509
           certificate in DSA or PEM format. The certificate must hold the public EC, RSA 2048,
           or RSA 3072 key corresponding to the private user-key used during `create`. No chain
           of trust is established. Ensuring that the certificate can be trusted is the
           responsibility of the user. The EC key must use the NIST/SECG curve over a 521 bit
           prime field (secp521r1).

       -o, --output <FILE>
           Store the result in FILE If the request contained abirtary user-data the output
           contains this user-data with padded zeros if available.  [default: '-']

EXAMPLES

       Create the add-secret request on a trusted system with signed user datai similar to the
       example for pvsecret. Let's assume there are three more files present .user_data contains
       ascii "some example user-data", a private user-signing key e.g. rsa3072
       usr_sgn_key.priv.pem, and a certificate containing the corresponding public key to the
       private rsa3072 key user_cert.pem.

              trusted:~$  pvsecret create -k hkd.crt --cert CA.crt --cert ibmsk.crt --hdr pvimage
                          -o addsecreq.bin  --user-data user_data --user-sign-key
                          usr_sgn_key.priv.pem association EXAMPLE
              Successfully generated the request
              Successfully wrote association info to 'EXAMPLE.yaml'

       For example, on the SE-guest, perform verify on the request to verify the user-signature
       and the saneness of the request. On success,  The user-data is printed to stdout (if
       --output was not specified) and Succesfully verified the request. is printed to stderr.

              seguest:~$  pvsecret verify --user-cert user_cert.pem -o addsecreq.bin
              some example user-data
              Successfully verified the request

SEE ALSO

       pvsecret(1)