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+# Creating an RPKI Root Certificate
+
+[rootd][1] does not create RPKI root certificates automatically. If you're
+running your own root, you have to do this yourself. The usual method of doing
+this is to use the OpenSSL command line tool. The exact details will depend on
+which resources you need to put in the root certificate, the URIs for your
+publication server, and so forth, but the general form looks something like
+this:
+
+    
+    
+    [req]
+    default_bits            = 2048
+    default_md              = sha256
+    distinguished_name      = req_dn
+    prompt                  = no
+    encrypt_key             = no
+    
+    [req_dn]
+    CN                      = Testbed RPKI root certificate
+    
+    [x509v3_extensions]
+    basicConstraints        = critical,CA:true
+    subjectKeyIdentifier    = hash
+    keyUsage                = critical,keyCertSign,cRLSign
+    subjectInfoAccess       = @sia
+    certificatePolicies     = critical,1.3.6.1.5.5.7.14.2
+    sbgp-autonomousSysNum   = critical,@rfc3779_asns
+    sbgp-ipAddrBlock        = critical,@rfc3997_addrs
+    
+    [sia]
+    1.3.6.1.5.5.7.48.5;URI  = rsync://example.org/rpki/root/
+    1.3.6.1.5.5.7.48.10;URI = rsync://example.org/rpki/root/root.mft
+    
+    [rfc3779_asns]
+    AS.0 = 64496-64511
+    AS.1 = 65536-65551
+    
+    [rfc3997_addrs]
+    IPv4.0 = 192.0.2.0/24
+    IPv4.1 = 198.51.100.0/24
+    IPv4.2 = 203.0.113.0/24 
+    IPv6.0 = 2001:0DB8::/32
+    
+
+Assuming you save this configuration in a file `root.conf`, you can use it to
+generate a root certificate as follows:
+
+    
+    
+    #!/bin/sh -
+    
+    # Generate the root key if it doesn't already exist.
+    test -f root.key ||
+    openssl genrsa -out root.key 2048
+    
+    # Generate the root certificate.
+    openssl req                     \
+            -new                    \
+            -x509                   \
+            -config root.conf       \
+            -key    root.key        \
+            -out    root.cer        \
+            -outform    DER         \
+            -days       1825        \
+            -set_serial 1           \
+            -extensions x509v3_extensions
+    
+
+You may want to shorten the five year expiration time (1825 days), which is a
+bit long. It is a root certificate, so a long expiration is not unusual.
+
+When regenerating a certificate using the same key, just skip the `openssl
+genrsa` step above.
+
+You must copy the generated root.cer to the publication directory as defined
+in rpki.conf:
+
+    
+    
+    rpki-root-cert          = ${myrpki::publication_base_directory}/root.cer
+    
+
+You must place the generated root.key in a safe location where it is readable
+by rootd but not accessible to the outside world, then you need to tell rootd
+where to find it by setting the appropriate variable in rpki.conf. The
+directory where the daemons keep their BPKI keys and certificates should be
+suitable for this:
+
+    
+    
+    rpki-root-key           = ${myrpki::bpki_servers_directory}/root.key
+    
+
+To create a TAL format trust anchor locator use the `make-tal.sh` script from
+`$top/rp/rcynic`:
+
+    
+    
+    $top/rp/rcynic/make-tal.sh  rsync://example.org/rpki/root/root.cer  root.cer
+    
+
+Note that, like any certificate, the root.cer you just generated will expire
+eventually. Either you need to remember to regenerate it before that happens,
+or you need to set up a cron job to do that for you automatically. Running the
+above shell script (really, just the `openssl req` command) should suffice to
+regenerate `root.cer`; remember to copy the updated `root.cer` to the
+publication directory.
+
+Regenerating the certificate does not require regenerating the TAL unless you
+change the key or URL.
+
+## Converting an existing RSA key from PKCS #8 format
+
+If you previously generated a certificate using `openssl req` with the
+`-newkey` option and are having difficulty getting `rootd` to accept the
+resulting private key, the problem may be that OpenSSL saved the private key
+file in PKCS #8 format. OpenSSL's behavior changed here, the `-newkey` option
+saved the key in PKCS #1 format, but newer versions use PKCS #8. While PKCS #8
+is indeed likely an improvement, the change confuses some programs, including
+versions of `rootd` from before we discovered this problem.
+
+If you think this might be your problem, you can convert the existing private
+key to PKCS #1 format with a script like this:
+
+    
+    
+    if ! openssl rsa -in root.key -out root.key.new
+    then
+        echo Conversion failed
+        rm root.key.new
+    elif cmp -s root.key root.key.new
+        echo No change
+        rm root.key.new
+    else
+        echo Converted
+        mv root.key.new root.key
+    fi
+    
+
+   [1]: #_.wiki.doc.RPKI.CA.Configuration.rootd
+