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RPKI-To-Router (RTR) sessions seem to be similar security-sensitivity as IBGP sessions. BIRD already offered a choice of either "plain TCP" (meh) or "SSH" (secure, albeit a bit more hassle to set up than TCP-MD5). The patch adds TCP-MD5 as another option. TCP-MD5 for RTR is specified through RFC 6810 section 7.3 and RFC 8210 section 9.3. Minor changes by committer.