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Jul 16, 2012 0

Facebook android sdk, invalid_key & key store alias

If you are getting this error ‘invalid_key: Android key mismatch. Your key “xxxxxxxxxxxxxx” does not match the allowed keys specified in your application settings’ then it clearly means that there is something wrong either with the key you generated or the key you have listed in facebook application page.

Although, the error description is very clear and straight forward but it took me some good amount of time to discover the actual cause. In my case, I was using wrong key store alias for generating the key, resulting in key mismatch when application is executed. So if you also have forgotten the key alias then there this command which returns details of a key in key store:
C:\Users\Waqas>keytool -list -v -keystore c:\path-to-keystore\key.store
enter the password if required and if all goes well you get’ll something like this:
Keystore type: JKS Keystore provider: SUN


Your keystore contains 1 entry
Alias name: sample-app

Creation date: May 13, 2012

Entry type: PrivateKeyEntry

Certificate chain length: 1

Certificate[1]:

Owner: CN=Waqas Hussain Siddiqui, C=PK

Issuer: CN=Waqas Hussain Siddiqui, C=PK

Serial number: 4faf9730

Valid from: Sun May 13 16:12:48 PKT 2012 until: Tue May 06 16:12:48 PKT 2042

Certificate fingerprints:

         MD5:  00:00:00:00:00:00:00:76:52:27:42:D3:72:96:84

         SHA1: BA:BA:EF:XX:XX:XX:8B:0A:94:1D:E7:XX:B5:72:AA:59:88:XX:F7:XX

         Signature algorithm name: SHA1withRSA

         Version: 3

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