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85 changes: 46 additions & 39 deletions
85
app/src/main/java/de/szalkowski/activitylauncher/services/IntentSigningService.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,52 +1,59 @@ | ||
| package de.szalkowski.activitylauncher.todo; | ||
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| import android.content.ComponentName; | ||
| import android.content.Context; | ||
| import android.content.SharedPreferences; | ||
| import android.util.Base64; | ||
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| import java.security.InvalidKeyException; | ||
| import java.security.NoSuchAlgorithmException; | ||
| import java.security.SecureRandom; | ||
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| import javax.crypto.Mac; | ||
| import javax.crypto.spec.SecretKeySpec; | ||
| package de.szalkowski.activitylauncher.services; | ||
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| import android.content.ComponentName | ||
| import android.content.Context | ||
| import android.content.Intent | ||
| import android.util.Base64 | ||
| import dagger.hilt.android.qualifiers.ApplicationContext | ||
| import java.security.SecureRandom | ||
| import javax.crypto.Mac | ||
| import javax.crypto.spec.SecretKeySpec | ||
| import javax.inject.Inject | ||
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| interface IntentSigningService { | ||
| fun signIntent(intent: Intent): String | ||
| fun validateIntentSignature(intent: Intent, signature: String): Boolean | ||
| } | ||
|
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| public class Signer { | ||
| private final String key; | ||
| class IntentSigningServiceImpl @Inject constructor(@ApplicationContext context: Context) : | ||
| IntentSigningService { | ||
| private val key: String | ||
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| public Signer(Context context) { | ||
| SharedPreferences preferences = context.getSharedPreferences("signer", Context.MODE_PRIVATE); | ||
| init { | ||
| val preferences = context.getSharedPreferences("signer", Context.MODE_PRIVATE) | ||
| if (!preferences.contains("key")) { | ||
| SecureRandom random = new SecureRandom(); | ||
| byte[] bytes = new byte[256]; | ||
| random.nextBytes(bytes); | ||
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| this.key = Base64.encodeToString(bytes, Base64.NO_WRAP); | ||
| preferences.edit().putString("key", this.key).apply(); | ||
| val random = SecureRandom() | ||
| val bytes = ByteArray(256) | ||
| random.nextBytes(bytes) | ||
| key = Base64.encodeToString(bytes, Base64.NO_WRAP) | ||
| preferences.edit().putString("key", key).apply() | ||
| } else { | ||
| this.key = preferences.getString("key", ""); | ||
| key = preferences.getString("key", "")!! | ||
| } | ||
| } | ||
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| /** | ||
| * Adapted from StackOverflow: | ||
| * https://stackoverflow.com/questions/36004761/is-there-any-function-for-creating-hmac256-string-in-android | ||
| */ | ||
| private static String hmac256(String key, String message) throws NoSuchAlgorithmException, InvalidKeyException { | ||
| Mac mac = Mac.getInstance("HmacSHA256"); | ||
| mac.init(new SecretKeySpec(key.getBytes(), "HmacSHA256")); | ||
| byte[] result = mac.doFinal(message.getBytes()); | ||
| return Base64.encodeToString(result, Base64.NO_WRAP); | ||
| override fun signIntent(intent: Intent): String { | ||
| val uri = intent.toUri(0) | ||
| return hmac256(key, uri) | ||
| } | ||
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| public String signComponentName(ComponentName comp) throws InvalidKeyException, NoSuchAlgorithmException { | ||
| String name = comp.flattenToShortString(); | ||
| return hmac256(this.key, name); | ||
| override fun validateIntentSignature(intent: Intent, signature: String): Boolean { | ||
| val compSignature = signIntent(intent) | ||
| return signature == compSignature | ||
| } | ||
|
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| public boolean validateComponentNameSignature(ComponentName comp, String signature) throws InvalidKeyException, NoSuchAlgorithmException { | ||
| String compSignature = this.signComponentName(comp); | ||
| return signature.equals(compSignature); | ||
| companion object { | ||
| /** | ||
| * Adapted from StackOverflow: | ||
| * https://stackoverflow.com/questions/36004761/is-there-any-function-for-creating-hmac256-string-in-android | ||
| */ | ||
| private fun hmac256(key: String?, message: String): String { | ||
| val mac = Mac.getInstance("HmacSHA256") | ||
| mac.init(SecretKeySpec(key!!.toByteArray(), "HmacSHA256")) | ||
| val result = mac.doFinal(message.toByteArray()) | ||
| return Base64.encodeToString(result, Base64.NO_WRAP) | ||
| } | ||
| } | ||
| } | ||
|
|
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