How Android obtains the system signature and uses the system signature

1. Make system signature:

1. Copy build\target\product\security\ platform.pk8 and platform.x509.pem under the source path and put them in the same directory

2. Generate platform.pem after executing the command

openssl pkcs8 -in platform.pk8 -inform DER -outform PEM -out platform.pem -nocrypt

3. Line command to generate platform.pk12

openssl pkcs12 -export -in platform.x509.pem -inkey platform.pem -out platform.pk12 -name dev

Here you need to enter the password twice 

 4. Execute the command to generate keystore

keytool -importkeystore -deststorepass 123456 -destkeypass 123456 -destkeystore debug.keystore -srckeystore platform.pk12 -srcstoretype PKCS12 -srcstorepass 123456 -alias androiddebugkey

keytool -importkeystore -deststorepass 上面输入的密码 -destkeystore platform.jks -srckeystore platform.pk12 -srcstoretype PKCS12 -srcstorepass 上面输入的密码

 5. Execute the command to generate jks

keytool -importkeystore -deststorepass hyydev -destkeystore hyysign.jks -srckeystore platform.p12 -srcstoretype PKCS12 -srcstorepass hyydev