Locate debug.keystore and get the SHA1 fingerprint using Keytool utility

keytool without password by pressing [ENTER]

keytool with default password "android"

The default location of debug.keystore is in ~/.android/ on OS X and Linux, in C:\Documents and Settings\<user>\.android\ on Windows XP, and in C:\Users\<user>\.android\ on Windows Vista and Windows 7...Windows 10.

To get get the SHA1 fingerprint for debug using Keytool utility, enter the command in DOS Prompt or Terminal:

keytool -exportcert -alias androiddebugkey -keystore C:\Users\user\.android\debug.keystore -list -v

or

keytool -keystore C:\Users\user\.android\debug.keystore -list -v

You will be asked to enter password, enter default password "android" or simple ignore by pressing [ENTER].