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.TH THUMBPRINT 6
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.SH NAME
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thumbprint \- public key thumbprints
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.SH DESCRIPTION
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.PP
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Applications in Plan 9 that use public keys for authentication,
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for example by calling
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.B tlsClient
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and
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.B okThumbprint
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(see
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.IR pushtls (2)),
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check the remote side's public key by comparing against
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thumbprints from a trusted list.
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The list is maintained by people who set local policies
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about which servers can be trusted for which applications,
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thereby playing the role taken by certificate authorities
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in PKI-based systems.
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By convention, these lists are stored as files in
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.B /sys/lib/tls/
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and protected by normal file system permissions.
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.PP
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Such a thumbprint file comprises lines made up of
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attribute/value pairs of the form
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.IB attr = value
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or
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.IR attr .
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The first attribute must be
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.B x509
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and the second must be
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.BI sha1= {hex checksum of binary certificate}.
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All other attributes are treated as comments.
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The file may also contain lines of the form
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.BI #include file
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.PP
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For example, a web server might have thumbprint
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.EX
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x509 sha1=8fe472d31b360a8303cd29f92bd734813cbd923c cn=*.cs.bell-labs.com
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.EE
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.SH "SEE ALSO"
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.IR pushtls (2)