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% tpm2_ecdhkeygen(1) tpm2-tools | General Commands Manual
# NAME
**tpm2_ecdhkeygen**(1) - Creates an ephemeral key and uses it to generate the
shared secret value using the parameters from a ECC public key.
# SYNOPSIS
**tpm2_ecdhkeygen** [*OPTIONS*]
# DESCRIPTION
**tpm2_ecdhkeygen**(1) - Creates an ephemeral key and uses it to generate the
shared secret value using the parameters from a ECC public key.
# OPTIONS
* **-c**, **\--context**=_FILE_:
Context object pointing to ECC public key.
Either a file or a handle number. See section "Context Object Format".
* **-u**, **\--public**=_FILE_:
Output ECC point Q.
* **-o**, **\--output**=_FILE_
Specify file path to save the calculated ecdh secret or Z point.
## References
[algorithm specifiers](common/alg.md) details the options for specifying
cryptographic algorithms _ALGORITHM_.
[common options](common/options.md) collection of common options that provide
information many users may expect.
[common tcti options](common/tcti.md) collection of options used to configure
the various known TCTI modules.
# EXAMPLES
```bash
tpm2_createprimary -C o -c prim.ctx -Q
tpm2_create -C prim.ctx -c key.ctx -u key.pub -r key.priv -G ecc256:ecdaa
tpm2_ecdhkeygen -u ecdh.pub -o ecdh.priv -c key.ctx
```
[returns](common/returns.md)
[footer](common/footer.md)
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