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A helper that generates an 11 alphanumeric hash for SMS Retriever API
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import android.annotation.TargetApi | |
import android.content.Context | |
import android.content.ContextWrapper | |
import android.content.pm.PackageManager | |
import android.util.Base64.* | |
import timber.log.Timber | |
import java.nio.charset.StandardCharsets | |
import java.security.MessageDigest | |
import java.security.NoSuchAlgorithmException | |
import java.util.* | |
import kotlin.collections.ArrayList | |
class AppSignatureHashHelper(context: Context?) : ContextWrapper(context) { // Get all package details | |
val appSignatures: ArrayList<String> | |
get() { | |
val appSignaturesHashs = ArrayList<String>() | |
try { | |
// Get all package details | |
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) { | |
appSignaturesHashs.add(String.format("%s", hash)) | |
} | |
} | |
} catch (e: Exception) { | |
Timber.e("Package not found", e) | |
} | |
return appSignaturesHashs | |
} | |
companion object { | |
private const val HASH_TYPE = "SHA-256" | |
const val NUM_HASHED_BYTES = 9 | |
const val NUM_BASE64_CHAR = 11 | |
@TargetApi(19) | |
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 = encodeToString(hashSignature, NO_PADDING or NO_WRAP) | |
base64Hash = base64Hash.substring(0, NUM_BASE64_CHAR) | |
return base64Hash | |
} catch (e: NoSuchAlgorithmException) { | |
Timber.e("No Such Algorithm Exception", e) | |
} | |
return null | |
} | |
} | |
} |
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