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1. Generate a private key file (engineCA.key) for MQTT Engine CA using the command below. You will be required to enter a pass phrase to be associated with the engineCA.key file. 

   Code Block
   language text
   openssl genrsa -des3 -out ca/engine/engineCA.key 2048

   
   

2. Generate a Certificate Signing Request (CSR) for the MQTT Engine CA using the command below. This command generates a new CSR named "engineCA.csr’ using the RSA private key "engineCA.key" and you will be required to enter the pass phrase created in the previous step.

   Code Block
   language text
   openssl req -new -key ca/engine/engineCA.key -out ca/engine/engineCA.csr

   
   

   Note

   There are a number of fields associated with the creation of the certificate. The required fields are: Country Name (2 letter code) []: State or Province Name (full name) []: Locality Name (eg, city) []: Organization Name (eg, company) []: Organizational Unit Name (eg, section) []: We set this as MQTT Engine CA Common Name (eg, fully qualified host name) []: We set this as the FQDN of the Chariot server Email Address []: Extra attributes to be sent with the certificate request are: A challenge password []:

   
   

3. Sign the MQTT Engine CA with the Root CA using the command below. This command will sign the CSR "engineCA.csr" with the Root CA certificate ‘ca.crt’ and RSA private key ‘ca.key’, creating a new X.509 certificate named ‘engineCA.crt’ valid for 3650 days (10 years). An "engineCA.srl" file will also be created containing the signed certificate's unique serial number. You will be required to enter the pass phrase associated with the private key file "ca.key".

   Code Block
   language text
   openssl x509 -req -in ca/engine/engineCA.csr -CA ca/ca.crt -CAkey ca/ca.key -CAcreateserial -out ca/engine/engineCA.crt -days 3650

   
   

Generate MQTT Transmision Client CA certificate signed with the Root CA

1. Generate a private key file (transmissionCA.key) for MQTT Transmission CA using the command below. You will be required to enter a pass phrase to be associated with the transmissionCA.key file. 

   Code Block
   language text
   openssl genrsa -des3 -out ca/transmission/transmissionCA.key 2048

   
   

2. Generate a Certificate Signing Request (CSR) for the MQTT Transmission CA using the command below. This command generates a new CSR named "transmissionCA.csr’ using the RSA private key "transmissionCA.key" and you will be required to enter the pass phrase created in the previous step.

   Code Block
   language text
   openssl req -new -key ca/transmission/transmissionCA.key -out ca/transmission/transmissionCA.csr

   
   

   Note

   There are a number of fields associated with the creation of the certificate. The required fields are: Country Name (2 letter code) []: State or Province Name (full name) []: Locality Name (eg, city) []: Organization Name (eg, company) []: Organizational Unit Name (eg, section) []: We set this as MQTT Transmission CA Common Name (eg, fully qualified host name) []: We set this as the FQDN of the Chariot server Email Address []: Extra attributes to be sent with the certificate request are: A challenge password []:

   
   

   
   

3. Sign the MQTT Transmission CA with the Root CA using the command below. This command will sign the CSR "transmissionCA.csr" with the Root CA certificate ‘ca.crt’ and RSA private key ‘ca.key’, creating a new X.509 certificate named ‘transmissionCA.crt’ valid for 3650 days (10 years). An "transmissionCA.srl" file will also be created containing the signed certificate's unique serial number. You will be required to enter the pass phrase associated with the private key file "ca.key".

   Code Block
   language text
   openssl x509 -req -in ca/transmission/transmissionCA.csr -CA ca/ca.crt -CAkey ca/ca.key -CAcreateserial -out ca/transmission/transmissionCA.crt -days 3650

   
   

You should now see the following files created:├──

├── ca/

│   ├── ca.crt

│   ├── ca.key

│   ├── ca.srl

│   ├── engine/

│   │   ├── engineCA.crt

│   │   ├── engineCA.csr

│   │   ├── engineCA.key

│   │   └── engineCA.srl

│   ├── server/

│   │   ├── serverCA.crt

│   │   ├── serverCA.csr

│   │   ├── serverCA.key

│   │   └── serverCA.srl

│   └── transmission/

│       ├── transmissionCA.crt

│       ├── transmissionCA.csr

│       ├── transmissionCA.key

│       └── transmissionCA.srl

You should now have the following files:

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