1 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 2 SPDX-License-Identifier: curl 3 Long: pinnedpubkey 4 Arg: <hashes> 5 Help: FILE/HASHES Public key to verify peer against 6 Protocols: TLS 7 Category: tls 8 Example: --pinnedpubkey keyfile $URL 9 Example: --pinnedpubkey 'sha256//ce118b51897f4452dc' $URL 10 Added: 7.39.0 11 See-also: hostpubsha256 12 Multi: single 13 --- 14 Tells curl to use the specified public key file (or hashes) to verify the 15 peer. This can be a path to a file which contains a single public key in PEM 16 or DER format, or any number of base64 encoded sha256 hashes preceded by 17 'sha256//' and separated by ';'. 18 19 When negotiating a TLS or SSL connection, the server sends a certificate 20 indicating its identity. A public key is extracted from this certificate and 21 if it does not exactly match the public key provided to this option, curl 22 aborts the connection before sending or receiving any data. 23 24 This option is independent of option --insecure. If you use both options 25 together then the peer is still verified by public key. 26 27 PEM/DER support: 28 29 OpenSSL and GnuTLS (added in 7.39.0), wolfSSL (added in 7.43.0), mbedTLS 30 (added in 7.47.0), Secure Transport macOS 10.7+/iOS 10+ (7.54.1), Schannel 31 (7.58.1) 32 33 sha256 support: 34 35 OpenSSL, GnuTLS and wolfSSL (added in 7.44.0), mbedTLS (added in 7.47.0), 36 Secure Transport macOS 10.7+/iOS 10+ (7.54.1), Schannel (7.58.1) 37 38 Other SSL backends not supported. 39