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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Long: pinnedpubkey
Arg: <hashes>
Help: FILE/HASHES Public key to verify peer against
Protocols: TLS
Category: tls
Example: --pinnedpubkey keyfile $URL
Example: --pinnedpubkey 'sha256//ce118b51897f4452dc' $URL
Added: 7.39.0
See-also: hostpubsha256
Multi: single
---
Tells curl to use the specified public key file (or hashes) to verify the
peer. This can be a path to a file which contains a single public key in PEM
or DER format, or any number of base64 encoded sha256 hashes preceded by
'sha256//' and separated by ';'.
When negotiating a TLS or SSL connection, the server sends a certificate
indicating its identity. A public key is extracted from this certificate and
if it does not exactly match the public key provided to this option, curl
aborts the connection before sending or receiving any data.
This option is independent of option --insecure. If you use both options
together then the peer is still verified by public key.
PEM/DER support:
OpenSSL and GnuTLS (added in 7.39.0), wolfSSL (added in 7.43.0), mbedTLS
(added in 7.47.0), Secure Transport macOS 10.7+/iOS 10+ (7.54.1), Schannel
(7.58.1)
sha256 support:
OpenSSL, GnuTLS and wolfSSL (added in 7.44.0), mbedTLS (added in 7.47.0),
Secure Transport macOS 10.7+/iOS 10+ (7.54.1), Schannel (7.58.1)
Other SSL backends not supported.
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