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

# [NAME](#NAME)

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

# [SYNOPSIS](#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](#DESCRIPTION)

Deprecated alias for [**nvme-keys-gen-kxchap-secret**(1)](/man/os/nvme-cli/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:

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

•*--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.

•*--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)](/man/os/nvme-cli/nvme-keys-gen-kxchap-secret.1) for the full option reference.

# [GLOBAL OPTIONS](#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 &lt;fmt&gt;, --output-format=&lt;fmt&gt;

Set the reporting format to *normal*, *tabular, 'json*, or *binary*. Only one output format may be used at a time.

--output-format-version=&lt;version&gt;

Select the output format version. Version *1* uses the original field naming, while version *2* (default) provides more consistent and script-friendly field names. Other versions are rejected.

--quiet

Suppress informational messages. Errors are still reported, and --quiet cancels any --verbose for the library log level.

--set-options=&lt;key=value&gt;\[,&lt;key=value&gt;...]

Set libnvme library options for this invocation. Supported keys are *force-4k*, *mi-probe-enabled*, *test-base-dir* and *test-sysfs-dir*.

--timeout=&lt;ms&gt;

Set the timeout for the command in milliseconds. *infinite* or *-1* waits without a time limit (0xffffffff).

-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)](/man/os/nvme-cli/nvme-cli.conf.5). A command-line flag always overrides the file.

# [EXAMPLES](#EXAMPLES)

No Examples

# [NVME](#NVME)

Part of the nvme-user suite

# [SEE ALSO](#SEE_ALSO)

[**nvme-keys-gen-kxchap-secret**(1)](/man/os/nvme-cli/nvme-keys-gen-kxchap-secret.1)

10/30/2026 NVMe

---

Document: nvme-gen-dhchap-key(1) from nvme-cli 3.2-r0 (Chainguard OS)
Source: https://github.com/linux-nvme/nvme-cli