Created
July 12, 2020 22:38
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This class give us the key for SMS Verification
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| import android.content.Context | |
| import android.content.ContextWrapper | |
| import android.content.pm.PackageManager | |
| import android.util.Base64 | |
| import android.util.Log | |
| import java.nio.charset.StandardCharsets | |
| import java.security.MessageDigest | |
| import java.security.NoSuchAlgorithmException | |
| import java.util.* | |
| import kotlin.collections.ArrayList | |
| class AppSignatureHelper(context: Context): ContextWrapper(context) { | |
| companion object { | |
| val TAG = AppSignatureHelper::class.java.simpleName | |
| private val HASH_TYPE = "SHA-256" | |
| val NUM_HASHED_BYTES = 9 | |
| val NUM_BASE64_CHAR = 11 | |
| } | |
| fun getAppSignatures(): ArrayList<String> { | |
| val appCodes = ArrayList<String>() | |
| return try { | |
| // Get all package signatures for the current package | |
| val packageName = packageName | |
| val packageManager = packageManager | |
| val signatures = packageManager.getPackageInfo(packageName, | |
| PackageManager.GET_SIGNATURES).signatures | |
| // For each signature create a compatible hash | |
| signatures | |
| .mapNotNull { hash(packageName, it.toCharsString()) } | |
| .mapTo(appCodes) { it } | |
| return appCodes | |
| } catch (e: PackageManager.NameNotFoundException) { | |
| Log.e(TAG, "Unable to find package to obtain hash.", e) | |
| ArrayList<String>() | |
| } | |
| } | |
| private fun hash(packageName: String, signature: String): String? { | |
| val appInfo = packageName + " " + signature | |
| return 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, "pkg: $packageName -- hash: $base64Hash") | |
| base64Hash | |
| } catch (e: NoSuchAlgorithmException) { | |
| Log.e(TAG, "hash:NoSuchAlgorithm", e) | |
| null | |
| } | |
| } | |
| } |
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