+.SS "verify"
+Check a key's fingerprint against a reference copy. The following
+options are supported:
+.TP
+.BI "\-f, \-\-filter " filter
+Specifies a filter. Only key components which match the filter are
+hashed. The default is to only fingerprint nonsecret components. An
+error is reported if no part of the key matches.
+.TP
+.BI "\-a, \-\-algorithm " hash
+Names the hashing algorithm. Run
+.B key show hash
+for a list of hashing algorithms. The default is
+.BR rmd160 .
+.PP
+The reference fingerprint is given as hex, in upper or lower case. The
+hash may contain hyphens, colons and whitespace. Other characters are
+not permitted.