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README.md
Generating Certificates
Name Constraints Examples
The following commands were used along with extensions.conf to generate the
certificates in nc.pem and nc_fail.pem.
# Once for each certificate.
$ openssl genrsa -out keyN.pem 2048
$ openssl req -new -key keyN.pem -out certN.csr
# <extension> will be v3_ca_nc for the intermediate and v3_req for the device.
$ openssl x509 -req -in certN.csr -CA certN-1.pem -CAkey keyN-1.pem
-CAcreateserial -extensions <extension> -extfile extensions.conf -out
certN.pem -days 365 -sha256
Note: it looks like openssl req also accepts extensions via -reqexts but
there is a known bug in openssl where extensions are transferred between CSRs
and X509 certs.