nodemcu-firmware/tools/makefile.sh

# * Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

#
# Generate the certificates and keys for testing.
#

PROJECT_NAME="Nodemcu Project"

# Generate the openssl configuration files.
cat > ca_cert.conf << EOF  
[ req ]
distinguished_name     = req_distinguished_name
prompt                 = no

[ req_distinguished_name ]
 O                      = $PROJECT_NAME Dodgy Certificate Authority
EOF

cat > certs.conf << EOF  
[ req ]
distinguished_name     = req_distinguished_name
prompt                 = no

[ req_distinguished_name ]
 O                      = $PROJECT_NAME
 CN                     = Nodemcu Client cert
EOF

cat > device_cert.conf << EOF  
[ req ]
distinguished_name     = req_distinguished_name
prompt                 = no

[ req_distinguished_name ]
 O                      = $PROJECT_NAME Device Certificate
EOF

# private key generation
openssl genrsa -out TLS.ca_key.pem 2048
openssl genrsa -out TLS.key_2048.pem 2048

# convert private keys into DER format
openssl rsa -in TLS.key_2048.pem -out TLS.key_2048 -outform DER

# cert requests
openssl req -out TLS.ca_x509.req -sha256 -key TLS.ca_key.pem -new \
            -config ./ca_cert.conf
openssl req -out TLS.x509_2048.req -sha256 -key TLS.key_2048.pem -new \
            -config ./certs.conf 

# generate the actual certs.
openssl x509 -req -in TLS.ca_x509.req -sha256 -out TLS.ca_x509.pem \
            -sha1 -days 5000 -signkey TLS.ca_key.pem
openssl x509 -req -in TLS.x509_2048.req -sha256 -out TLS.x509_2048.pem \
            -sha1 -CAcreateserial -days 5000 \
            -CA TLS.ca_x509.pem -CAkey TLS.ca_key.pem

# some cleanup
rm TLS*.req
rm *.conf

openssl x509 -in TLS.ca_x509.pem -outform DER -out TLS.ca_x509.cer
openssl x509 -in TLS.x509_2048.pem -outform DER -out TLS.x509_2048.cer

#
# Generate the certificates and keys for encrypt.
#

# set default cert for use in the client
xxd -i  TLS.x509_2048.cer | sed -e \
        "s/TLS_x509_2048_cer/default_certificate/" > cert.h
# set default key for use in the server
xxd -i TLS.key_2048 | sed -e \
        "s/TLS_key_2048/default_private_key/" > private_key.h