Created
February 2, 2019 11:39
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class AppSignatureHelper(context: Context) : ContextWrapper(context) { | |
/** | |
* Get all the app signatures for the current package | |
* @return | |
*/ | |
// Get all package signatures for the current package | |
// For each signature create a compatible hash | |
fun getAppSignatures(): ArrayList<String> { | |
val appCodes = ArrayList<String>() | |
try { | |
val packageName = packageName | |
val packageManager = packageManager | |
val signatures = packageManager.getPackageInfo(packageName, | |
PackageManager.GET_SIGNATURES).signatures | |
for (signature in signatures) { | |
val hash = hash(packageName, signature.toCharsString()) | |
if (hash != null) { | |
appCodes.add(String.format("%s", hash)) | |
} | |
} | |
} catch (e: PackageManager.NameNotFoundException) { | |
Log.e(TAG, "Unable to find package to obtain hash.", e) | |
} | |
return appCodes | |
} | |
private fun hash(packageName: String, signature: String): String? { | |
val appInfo = "$packageName $signature" | |
try { | |
val messageDigest = MessageDigest.getInstance(HASH_TYPE) | |
messageDigest.update(appInfo.toByteArray(StandardCharsets.UTF_8)) | |
var hashSignature = messageDigest.digest() | |
// truncated into NUM_HASHED_BYTES | |
hashSignature = Arrays.copyOfRange(hashSignature, 0, NUM_HASHED_BYTES) | |
// encode into Base64 | |
var base64Hash = Base64.encodeToString(hashSignature, Base64.NO_PADDING or Base64.NO_WRAP) | |
base64Hash = base64Hash.substring(0, NUM_BASE64_CHAR) | |
Log.d(TAG, String.format("pkg: %s -- hash: %s", packageName, base64Hash)) | |
return base64Hash | |
} catch (e: NoSuchAlgorithmException) { | |
Log.e(TAG, "hash:NoSuchAlgorithm", e) | |
} | |
return null | |
} | |
} |
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