Thanks to Viafirma, signing electronically from mobile devices is possible. And for this, the digital certificate must reside on the device. In this article we explain how to install a digital certificate in Android, the process is very simple and can be done from different locations. In this article we explain how to install a digital certificate on Android from each location.
From the credentials keyring
This is the application where all system passwords are stored.
If you have a PKCS#12 file with a .pfx or .p12 extension, you can install the electronic certificate and save the password in the credential keyring so that you do not have to re-enter it every time a document is signed.
From a physical location on the device itself
To use your digital certificate from Android, you only need to connect your device to the PC or laptop where you have the digital certificate file in .p12 or .pfx format (export of the certificate with private key).
You copy it to the root of the file system of your Android (whether it is on the external memory card or in the internal memory) and you have it available to sign electronically.