NVME-GEN-DHCHAP-K(1)              NVMe Manual             NVME-GEN-DHCHAP-K(1)

NAME
       nvme-gen-dhchap-key - Generate a host DH-HMAC-CHAP secret (deprecated)

SYNOPSIS
       nvme [<global-options>] gen-dhchap-key [--hmac=<hmac-id> | -m <hmac-id>]
                               [--secret=<secret> | -s <secret>]
                               [--key-length=<len> | -l <len>]
                               [--nqn=<host-nqn> | -n <host-nqn>]

DESCRIPTION
       Deprecated alias for nvme-keys-gen-kxchap-secret(1), kept for scripts
       written against nvme-cli versions older than 3.0. It forwards to that
       command, with three differences from nvme-cli 2.x:

       o   --nqn/-n is accepted and ignored, with a warning.

       o   --secret/-s goes into the DHHC-1 string as it stands, where 2.x put
           the key transformed from it, so the output differs whenever --hmac
           is non-zero.

       o   --secret/-s with an odd number of hexadecimal characters is
           rejected, where 2.x padded the trailing one with a zero and emitted
           a secret that was never given.

       New scripts should use nvme keys gen-kxchap-secret instead. This alias
       prints a deprecation warning on stderr and may be removed in a future
       release.

       See nvme-keys-gen-kxchap-secret(1) for the full option reference.

GLOBAL OPTIONS
       The following options are defined at the top-level nvme command and are
       available to this subcommand:

       --dry-run
           Print the command that would be executed, but do not actually
           execute it.

       --no-ioctl-probing
           Disable probing for 64-bit IOCTL support.

       --no-retries
           Disable retry logic on transient errors.

       -o <fmt>, --output-format=<fmt>
           Set the reporting format to normal, tabular, 'json, or binary. Only
           one output format may be used at a time.

       --output-format-version=<version>
           Select the output format version. Version 1 uses the original field
           naming, while version 2 (default) provides more consistent and
           script-friendly field names.

       --timeout=<ms>
           Set the timeout for the command in milliseconds.

       -v, --verbose
           Increase the level of detail in the output. May be specified
           multiple times to further increase verbosity.

       These options can also be set as machine-wide defaults in
       nvme-cli.conf(5). A command-line flag always overrides the file.

EXAMPLES
       No Examples

NVME
       Part of the nvme-user suite

SEE ALSO
       nvme-keys-gen-kxchap-secret(1)

NVMe                              09/18/2026              NVME-GEN-DHCHAP-K(1)