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% tpm2_ecdhzgen(1) tpm2-tools | General Commands Manual
# NAME
**tpm2_ecdhzgen**(1) - Recovers the shared secret value (Z) from a public point
and a specified private key.
# SYNOPSIS
**tpm2_ecdhzgen** [*OPTIONS*]
# DESCRIPTION
**tpm2_ecdhzgen**(1) - Recovers the shared secret value (Z) from a public point
and a specified private key. It will perform the multiplication of the provided
inPoint (QB) with the private key (ds) and return the coordinates of the
resultant point (Z = (xZ , yZ) ≔ [hds]QB; where h is the cofactor of the curve).
# OPTIONS
* **-c**, **\--key-context**=_FILE_:
Context object pointing to ECC key.
Either a file or a handle number. See section "Context Object Format".
* **-p**, **\--key-auth**=_AUTH_:
The authorization value for the ECC key object.
* **-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:ecdh
tpm2_ecdhkeygen -u ecdh.pub -o ecdh.priv -c key.ctx
tpm2_ecdhzgen -u ecdh.pub -o ecdh.dat -c key.ctx
```
[returns](common/returns.md)
[footer](common/footer.md)
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