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The Android agent must have the CA certificate inside the application when configuring the Secure Sockets Layer (SSL). The CA certificate is stored in a BKS (bouncycastle) file. Follow the steps given below to create and generate a BKS file: 

Prerequisites 

Step 1: Creating a BKS file

If you configured EMM for iOS, you can skip this step and move to Step 2 by using the already generated and imported Certificate Authority (CA), Registration Authority (RA), and SSL certificate files.

  1. Navigate to the openssl.cnf file of the OpenSSL installation. 

  2. Make a copy of the  openssl.cnf  file, move it to another location, and configure the file to generate version 3 certificates as shown below:

    [ v3_req ] 
# Extensions to add to a certificate request 
basicConstraints=CA:TRUE 
keyUsage = Digital Signature, Key Encipherment 

[ v3_ca ] 
# Extensions for a typical CA 
# PKIX recommendation. 
subjectKeyIdentifier=hash 
authorityKeyIdentifier=keyid:always,issuer 
# This is what PKIX recommends but some broken software chokes on critical 
# extensions. 
basicConstraints = critical,CA:true 
# So we do this instead. 
#basicConstraints = CA:true 
# Key usage: this is typical for a CA certificate. However since it will 
# prevent it being used as an test self-signed certificate it is best 
# left out by default. 
keyUsage = Digital Signature, Certificate Sign, CRL Sign

  3. In the location where you modified and saved the openssl.cnf file, run the following commands to generate a self-signed Certificate Authority (CA) certificate (version 3) and convert the certificate to the.pem format:

    1. openssl genrsa -out <CA PRIVATE KEY> 4096
      For example: openssl genrsa -out ca_private.key 4096
    2. openssl req -new -key <CA PRIVATE KEY> -out <CA CSR>
      For example: openssl req -new -key ca_private.key -out ca.csr
    3. openssl x509 -req -days <DAYS> -in <CA CSR> -signkey <CA PRIVATE KEY> -out <CA CRT> -extensions v3_ca -extfile <PATH-TO-MODIFIED-openssl.cnf-FILE>
      For example: openssl x509 -req -days 365 -in ca.csr -signkey ca_private.key -out ca.crt -extensions v3_ca -extfile ./openssl.cnf
    4. openssl rsa -in <CA PRIVATE KEY> -text > <CA PRIVATE PEM>
      For example:  openssl rsa -in ca_private.key -text > ca_private.pem
    5. openssl x509 -in <CA CRT> -out <CA CERT PEM>
      For example: openssl x509 -in ca.crt -out ca_cert.pem

  4. In the same location, run the following commands to generate a Registration Authority (RA) certificate (version 3), sign it with the CA, and convert the certificate to the .pem  format. 

    1. openssl genrsa -out <RA PRIVATE KEY> 4096
      For example:  openssl genrsa -out ra_private.key 4096

    2. openssl req -new -key <RA PRIVATE KEY> -out <RA CSR>
      For example: openssl req -new -key ra_private.key -out ra.csr
    3. openssl x509 -req -days <DAYS> -in <RA CSR> -CA <CA CRT> -CAkey <CA PRIVATE KEY> -set_serial <SERIAL NO> -out <RA CRT> -extensions v3_req -extfile <PATH-TO-MODIFIED- openssl.cnf-FILE >
      For example: openssl x509 -req -days 365 -in ra.csr -CA ca.crt -CAkey ca_private.key -set_serial 02 -out ra.crt -extensions v3_req -extfile ./openssl.cnf
    4. openssl rsa -in <CA PRIVATE KEY> -text > <RA PRIVATE PEM>
      For example: openssl rsa -in ra_private.key -text > ra_private.pem
    5. openssl x509 -in <RA CRT> -out <RA CERT PEM>
      For example: openssl x509 -in ra.crt -out ra_cert.pem

  5. Generate the SSL certificate (version 3) based on your domain/IP address:

    You must add your IP address/domain as the Common Name. Otherwise, provisioning will fail. 

    1. Generate an RSA key.
      openssl genrsa -out <RSA_key>.key 4096
      For example:
      openssl genrsa -out ia.key 4096
    2. Generate a CSR file.
      openssl req -new -key <RSA_key>.key -out <CSR>.csr
      For example:
      openssl req -new -key ia.key -out ia.csr
      Enter your server IP address/domain name (e.g., 192.168.1.157) as the Common Name else provisioning will fail.
    3. Generate the SSL certificate.
      openssl x509 -req -days 730 -in <CSR>.csr -CA ca_cert.pem -CAkey ca_private.pem -set_serial <serial number> -out ia.crt
      For example: 
      openssl x509 -req -days 730 -in ia.csr -CA ca_cert.pem -CAkey ca_private.pem -set_serial 044324343 -out ia.crt

  6. Export the SSL, CA, and RA files as PKCS12 files with an alias.

    1. Export the SSL file as a PKCS12 file with "wso2carbon" as the alias. 
      openssl pkcs12 -export -out <KEYSTORE>.p12 -inkey <RSA_key>.key -in ia.crt -CAfile ca_cert.pem -name "<alias>"
      For example:
      openssl pkcs12 -export -out KEYSTORE.p12 -inkey ia.key -in ia.crt -CAfile ca_cert.pem -name "wso2carbon"

    2. Export the CA file as a PKCS12 file with an alias.
      openssl pkcs12 -export -out <CA>.p12 -inkey <CA private key>.pem -in <CA Cert>.pem -name "<alias>"
      For example:
      openssl pkcs12 -export -out ca.p12 -inkey ca_private.pem -in ca_cert.pem -name "cacert"
      In the above example, cacert has been used as the CA alias. 
    3. Export the RA file as a PKCS12 file with an alias.
      openssl pkcs12 -export -out <RA>.p12 -inkey <RA private key>.pem -in <RA Cert>.pem -chain -CAfile <CA cert>.pem -name "<alias>"
      For example:
      openssl pkcs12 -export -out ra.p12 -inkey ra_private.pem -in ra_cert.pem -chain -CAfile ca_cert.pem -name "racert"
      In the above example, racert has been used as the RA alias. 
  7. Copy the three P12 files to the <EMM_HOME>/repository/resources/security directory.
  8. Import the generated P12 files as follows:

    1. Import the generated <KEYSTORE>.p12 file into the wso2carbon.jks and client-truststore.jks in the <EMM_HOME>/repository/resources/security directory.
      keytool -importkeystore -srckeystore <KEYSTORE>.p12 -srcstoretype PKCS12 -destkeystore <wso2carbon.jks/client-truststore.jks>

      When prompted, enter the keystore password and keystore key password as wso2carbon.

      For example:
      keytool -importkeystore -srckeystore KEYSTORE.p12 -srcstoretype PKCS12 -destkeystore wso2carbon.jks
      keytool -importkeystore -srckeystore KEYSTORE.p12 -srcstoretype PKCS12 -destkeystore client-truststore.jks

    2. Import the generated <CA>.p12 and <RA>.p12 files into the wso2certs.jks file, which is in the <EMM_HOME>/repository/resources/security directory.
      keytool -importkeystore -srckeystore <CA/RA>.p12 -srcstoretype PKCS12 -destkeystore wso2emm.jks

      For example:
      keytool -importkeystore -srckeystore ca.p12 -srcstoretype PKCS12 -destkeystore wso2certs.jks 
      Enter the keystore password as wso2carbon and keystore key password as cacert.

      keytool -importkeystore -srckeystore ra.p12 -srcstoretype PKCS12 -destkeystore wso2certs.jks 
      Enter the keystore password as  wso2carbon  and keystore key password as racert.

      Troubleshooting

      Why does the following error occur: " keytool error: java.io.IOException: Invalid keystore format"?

      If you enter the wrong private key password when importing the <CA>.p12 or <RA>.p12 files, the wso2certs.jks file will get corrupted and the above error message will appear.

      In such a situation, delete the wso2certs.jks file and execute the following command to import the generated <CA>.p12 and <RA>.p12 files into the wso2certs.jks file again.
      keytool -importkeystore -srckeystore <CA/RA>.p12 -srcstoretype PKCS12 -destkeystore wso2certs.jks

      When the above command is executed, EMM will automatically create a new wso2certs.jks file with the imported file.

Step 2: Generating a BKS file

Follow all the steps given under step 1 before generating the BKS file to avoid errors.

  1. Generate the BKS file:

    Ensure that you have the bcprov-jdk16-146.jar file in the same folder where you will be generating the BKS file before you run this command.

    keytool -noprompt -import -v -trustcacerts -alias 'openssl x509 -inform PEM -subject_hash -noout -in ca_cert.pem' -file ca_cert.pem -keystore emm_truststore.bks -storetype BKS -providerclass org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath bcprov-jdk16-146.jar -storepass 'wso2carbon'

    If you are using an SSL certificate by a trusted authority such as GoDaddy, the cert.crt defined in the command should be the interim certificate. 
    Example:

    keytool -noprompt -import -v -trustcacerts -alias godaddy -file cert.crt -keystore emm_truststore.bks -storetype BKS -providerclass org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath bcprov-jdk16-146.jar -storepass 'wso2carbon'

  2. Optionally, view the list of certificates in the BKS form using the following command:

    keytool -list -v -keystore "emm_truststore.bks" -provider org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath "bcprov-jdk16-1.46.jar" -storetype BKS -storepass "wso2carbon"
  3. Copy the generated emm_truststore.bks file to the Android res/raw folder. 
  4. Navigate to the Constants.java file, which is in the Android folder and configure the following:
    • Provide the HTTPS_HOST_IP as the value for the SERVER_PORT parameter.
      Example: 9443.
    • Change the SERVER_PROTOCOL to https://.
    • Provide the BKS file password as the value for the TRUSTSTORE_PASSWORD parameter.
    Sample
    	public static boolean DEBUG_MODE_ENABLED = false;
	public static boolean LOCAL_NOTIFICATIONS_ENABLED = true;
	public static boolean GCM_ENABLED = false;

	public static String SERVER_IP = "";

	public static String SERVER_PORT = "9443";
	public static String SERVER_PROTOCOL = "https://";
	public static String API_VERSION = "1.0.0";
	
	public static String SERVER_APP_ENDPOINT = "/EMM/api/";

	public static String OAUTH_ENDPOINT = "/oauth2/token";
	public static String SENDER_ID_ENDPOINT = "devices/sender_id/";
	public static String IS_REGISTERED_ENDPOINT = "devices/isregistered/";
	public static String LICENSE_ENDPOINT = "devices/license/";
	public static String REGISTER_ENDPOINT = "devices/register/";
	public static String UNREGISTER_ENDPOINT = "devices/unregister/";
	public static String NOTIFICATION_ENDPOINT = "notifications/pendingOperations/";
	
	public static String SERVER_URL = SERVER_PROTOCOL + SERVER_IP + ":"
			+ SERVER_PORT + SERVER_APP_ENDPOINT;

	public static final String TRUSTSTORE_PASSWORD = "";
	public static final String EULA_TITLE = "POLICY AGREEMENT";
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