Is there any way to get key hash from signed APK?

Question

Is there any way to get key hash from signed APK? We have a signed Android apk file, and we want to find out key hash of this APK, for Facebook SDK. Can we do that by something like jarsigner?
Any suggestions?

Answer 1

On linux, I used this command to get the key hash from an apk:

 keytool -list -printcert -jarfile [path_to_your_apk] | grep -Po "(?<=SHA1:) .*" |  xxd -r -p | openssl base64 

For Mac Users (OS X) as there is no grep -P support

keytool -list -printcert -jarfile ~/Downloads/YOURAPKFILE.apk | grep "SHA1: " | cut -d " " -f 3 | xxd -r -p | openssl base64

Answer 2

For windows users getting the key from openssl, may be tricky some times.. I always use this to find the right signature.. Just paste this code in your onCreate() and run.

 // Add code to print out the key hash   try {   PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);   for (Signature signature : info.signatures) {   MessageDigest md = MessageDigest.getInstance("SHA");   md.update(signature.toByteArray());   Log.e("MY KEY HASH:", Base64.encodeToString(md.digest(), Base64.DEFAULT));       }   } catch (NameNotFoundException e) {    } catch (NoSuchAlgorithmException e) {    } 

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Update:

Using Android studio(2.1.2):

1. Open your project on studio and click on the gradle icon.
2. Choose your app -> Tasks -> android -> SigningReport

This will run a gradle task that will print the debug and release certificate with md5 and sha1 keys