I have opted for google play app signing and i understand that google changes the signing keys for the app and I found the Sha 1 certificate but couldnt find the keyhash .
How can i get the keyhash of my released app is there a way to extract it from the certificate?
If you've published your app using Play App Signing, a requirement when using Android App Bundle, you can get your SHA-1 from the Google Play Console on the Release > Setup > App Integrity page.
Open Play Console and go to the Play App Signing page (Release > Setup > App integrity). In the “Upgrade your app signing key” card, select Request key upgrade. Select an option to upgrade your app signing key to all installs on Android Y and above.
The Google Play License Key is a cryptographic key provided by Google for your app in the Play Store. Singular can use the Key to help validate information coming from Google and improve your protection from attribution fraud.
You can convert SHA-1 hash in hex format (as found in Play console, see Release management -> App Signing) into base64 hash using next command:
echo 33:4E:48:84:19:50:3A:1F:63:A6:0F:F6:A1:C2:31:E5:01:38:55:2E | xxd -r -p | openssl base64
Output:
M05IhBlQOh9jpg/2ocIx5QE4VS4=
This hash can be used for example when setting up Facebook app.
You can extract keyhash from the Sha1 certificate signature. Key hashes are usually extracted in the following way:
public static String getKeyHash(final Context context) { PackageInfo packageInfo = getPackageInfo(context, PackageManager.GET_SIGNATURES); if (packageInfo == null) return null; for (Signature signature : packageInfo.signatures) { try { MessageDigest md = MessageDigest.getInstance("SHA"); md.update(signature.toByteArray()); return Base64.encodeToString(md.digest(), Base64.NO_WRAP); } catch (NoSuchAlgorithmException e) { Log.w(TAG, "Unable to get MessageDigest. signature=" + signature, e); } } return null; }
You can see that SHA-1 version of signature is Base64 encoded.
Under App Signing menu in Google play developer console, you will see Sha-1 certificate signature that looks like this:
SHA1: 3B:DA:A0:5B:4F:35:71:02:4E:27:22:B9:AC:B2:77:2F:9D:A9:9B:D9
Basically, what you have to do is to change this into a byte array and Base64 encode that byte array. You can do something like:
byte[] sha1 = { 0x3B, (byte)0xDA, (byte)0xA0, 0x5B, 0x4F, 0x35, 0x71, 0x02, 0x4E, 0x27, 0x22, (byte)0xB9, (byte)0xAc, (byte)0xB2, 0x77, 0x2F, (byte)0x9D, (byte)0xA9, (byte)0x9B, (byte)0xD9 }; Log.e("keyhash", Base64.encodeToString(sha1, Base64.NO_WRAP));
You can register this keyhash to facebook android login settings or wherever you like.
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