DKIM: support multiple hash methods

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 35f3eb80ea4c39dd418e6c3778a64d5146d90fd2..61a6f0e83274d4c2ed6bb0e99aa1e6ca8871ef69 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -1667,6 +1667,9 @@ Symbolic links to the sources are installed in this directory, which is where
 the actual building takes place. In most cases, Exim can discover the machine
 architecture and operating system for itself, but the defaults can be
 overridden if necessary.
+.cindex compiler requirements
+.cindex compiler version
+A C99-capable compiler will be required for the build.
 
 
 .section "PCRE library" "SECTpcre"
@@ -23796,6 +23799,7 @@ of the message. Its value must not be zero. See also &%final_timeout%&.
 .option dkim_canon smtp string&!! unset
 .option dkim_strict smtp string&!! unset
 .option dkim_sign_headers smtp string&!! unset
+.option dkim_hash smtp string&!! sha256
 DKIM signing options.  For details see section &<<SECDKIMSIGN>>&.
 
 
@@ -36037,6 +36041,7 @@ the following table:
 &`SNI `&        server name indication from TLS client hello
 &`ST  `&        shadow transport name
 &`T   `&        on &`<=`& lines: message subject (topic)
+&`TFO `&        connection took advantage of TCP Fast Open
 &`    `&        on &`=>`& &`**`& and &`==`& lines: transport name
 &`U   `&        local user or RFC 1413 identity
 &`X   `&        TLS cipher suite
@@ -38565,6 +38570,12 @@ list of header names. Headers with these names will be included in the message
 signature.
 When unspecified, the header names recommended in RFC4871 will be used.
 
+.new
+.option dkim_hash smtp string&!! sha256
+Can be set alternatively to &"sha1"& to use an alternate hash
+method.  Note that sha1 is now condidered insecure, and deprecated.
+.wen
+
 
 .section "Verifying DKIM signatures in incoming mail" "SECID514"
 .cindex "DKIM" "verification"