Fixes bug on saving Encrypted files on DMs.

Fixes bug when using partial downloads to display videos on DMs.

quartz/src/androidTest/java/com/vitorpamplona/quartz/nip17Dm/AESGCMTest.kt

@@ -54,4 +54,22 @@ class AESGCMTest {
 
         assertEquals(44201, decrypted.size)
     }
+
+    @Test
+    fun videoTest2() {
+        val myCipher =
+            AESGCM(
+                "373d19850ebc8ed5b0fefcca5cd6f27fde9cb6ac54fd32f6b4fad9d68ebe8ee0".hexToByteArray(),
+                "95e67b6874784a54299b58b8990499bd".hexToByteArray(),
+            )
+
+        val encrypted =
+            getInstrumentation().context.assets.open("trouble_video").use {
+                it.readAllBytes()
+            }
+
+        val decrypted = myCipher.decrypt(encrypted)
+
+        assertEquals(1277122, decrypted.size)
+    }
 }

quartz/src/main/java/com/vitorpamplona/quartz/nip04Dm/crypto/AESCBC.kt

@@ -20,8 +20,10 @@
  */
 package com.vitorpamplona.quartz.nip04Dm.crypto
 
+import android.util.Log
 import com.vitorpamplona.quartz.nip17Dm.files.encryption.NostrCipher
 import com.vitorpamplona.quartz.utils.RandomInstance
+import java.security.GeneralSecurityException
 import javax.crypto.Cipher
 import javax.crypto.spec.IvParameterSpec
 import javax.crypto.spec.SecretKeySpec
@@ -50,6 +52,14 @@ class AESCBC(
             doFinal(bytesToDecrypt)
         }
 
+    override fun decryptOrNull(bytesToDecrypt: ByteArray): ByteArray? =
+        try {
+            decrypt(bytesToDecrypt)
+        } catch (e: GeneralSecurityException) {
+            Log.w("AESCBC", "Failed to decrypt", e)
+            null
+        }
+
     companion object {
         const val NAME = "aes-cbc"
     }

quartz/src/main/java/com/vitorpamplona/quartz/nip17Dm/files/encryption/AESGCM.kt

@@ -20,8 +20,10 @@
  */
 package com.vitorpamplona.quartz.nip17Dm.files.encryption
 
+import android.util.Log
 import com.vitorpamplona.quartz.nip01Core.core.toHexKey
 import com.vitorpamplona.quartz.utils.RandomInstance
+import java.security.GeneralSecurityException
 import javax.crypto.Cipher
 import javax.crypto.spec.GCMParameterSpec
 import javax.crypto.spec.SecretKeySpec
@@ -56,6 +58,14 @@ class AESGCM(
             doFinal(bytesToDecrypt)
         }
 
+    override fun decryptOrNull(bytesToDecrypt: ByteArray): ByteArray? =
+        try {
+            decrypt(bytesToDecrypt)
+        } catch (e: GeneralSecurityException) {
+            Log.w("AESGCM", "Failed to decrypt", e)
+            null
+        }
+
     companion object {
         const val NAME = "aes-gcm"
     }

quartz/src/main/java/com/vitorpamplona/quartz/nip17Dm/files/encryption/NostrCipher.kt

@@ -26,4 +26,6 @@ interface NostrCipher {
     fun encrypt(bytesToEncrypt: ByteArray): ByteArray
 
     fun decrypt(bytesToDecrypt: ByteArray): ByteArray
+
+    fun decryptOrNull(bytesToDecrypt: ByteArray): ByteArray?
 }