How to generate 11 char hash key for Sms Retriever with Google App signing

Here is the complete step by step guide .

Go to play console -> open app -> Release management -> App Signing -> Download Certificate . Like in below screen shot

This will give you deployment_cert.der file

use below command

keytool -importcert -alias YOUR_ALIAS -file deployment_cert.der -keystore certificate.jks -storepass YOUR_PASSWORD

Replace YOUR_ALIAS,YOUR_PASSWORD with yours which used in keystore . In place of deployment_cert.der use complete path if required

After entering this command it will ask

Trust this certificate? [no]: yes

type yes and click enter . It will show message

Certificate was added to keystore

This will generate a new file certificate.jks

Now in terminal enter command

keytool -exportcert -alias YOUR_ALIAS -keystore certificate.jks | xxd -p | tr -d "[:space:]" | echo -n YOUR_PACKAGE `cat` | sha256sum | tr -d "[:space:]-" | xxd -r -p | base64 | cut -c1-11

Replace YOUR_ALIAS,YOUR_PACKAGE with yours which used in keystore,project . In place of certificate.jks use complete path if required

it will ask for password

Enter keystore password: mypassword

enter your password and you will get the hash .

EDIT For MacOS users:

If you’re using MacOS you can install sha256sum by installing coreutils like this:

brew install coreutils

Or you can use shasum -a 256 instead of sha256sum like this:

Credits to Abhinav Gupta and Op of this question Farhan Farooqui and above answer from Nick Fortescue