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---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Long: engine
Arg: <name>
Help: Crypto engine to use
Protocols: TLS
Category: tls
Added: 7.9.3
Multi: single
See-also:
- ciphers
- curves
Example:
- --engine flavor $URL
---
# `--engine`
Select the OpenSSL crypto engine to use for cipher operations. Use `--engine
list` to print a list of build-time supported engines. Note that not all (and
possibly none) of the engines may be available at runtime.
The OpenSSL concept "engines" has been superseded by "providers" in OpenSSL 3,
and this option should work fine to specify such as well.
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