Skip to content

Instantly share code, notes, and snippets.

@shikto1
Created December 22, 2020 18:21
Show Gist options
  • Save shikto1/557b3306407f032af4cd95ae48abaaed to your computer and use it in GitHub Desktop.
Save shikto1/557b3306407f032af4cd95ae48abaaed to your computer and use it in GitHub Desktop.
package com.shishirthedev.smsretriverapi
import android.annotation.TargetApi
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.*
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) {
Log.e(TAG, "Package not found", e)
}
return appSignaturesHashs
}
companion object {
val TAG = AppSignatureHashHelper::class.java.simpleName
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 =
Base64.encodeToString(hashSignature, Base64.NO_PADDING or Base64.NO_WRAP)
base64Hash = base64Hash.substring(0, NUM_BASE64_CHAR)
return base64Hash
} catch (e: NoSuchAlgorithmException) {
Log.e(TAG, "No Such Algorithm Exception", e)
}
return null
}
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment