fix: check if passphrase is necessary before asking for it

Updates #2836

2 files changed, 13 insertions, 1 deletions

diff --git a/app/src/main/java/app/passwordstore/data/crypto/CryptoRepository.kt b/app/src/main/java/app/passwordstore/data/crypto/CryptoRepository.kt
index 0ce4b3e3..be3f8da3 100644
--- a/app/src/main/java/app/passwordstore/data/crypto/CryptoRepository.kt
+++ b/app/src/main/java/app/passwordstore/data/crypto/CryptoRepository.kt
@@ -45,6 +45,10 @@ constructor(
     out: ByteArrayOutputStream,
   ) = withContext(dispatcherProvider.io()) { decryptPgp(password, identities, message, out) }
 
+  fun isPasswordProtected(message: ByteArrayInputStream): Boolean {
+    return pgpCryptoHandler.isPassphraseProtected(message)
+  }
+
   suspend fun encrypt(
     identities: List<PGPIdentifier>,
     content: ByteArrayInputStream,
diff --git a/app/src/main/java/app/passwordstore/ui/crypto/DecryptActivity.kt b/app/src/main/java/app/passwordstore/ui/crypto/DecryptActivity.kt
index 9fb20af2..56ac1fc0 100644
--- a/app/src/main/java/app/passwordstore/ui/crypto/DecryptActivity.kt
+++ b/app/src/main/java/app/passwordstore/ui/crypto/DecryptActivity.kt
@@ -177,7 +177,7 @@ class DecryptActivity : BasePGPActivity() {
     }
   }
 
-  private fun askPassphrase(
+  private suspend fun askPassphrase(
     isError: Boolean,
     gpgIdentifiers: List<PGPIdentifier>,
     authResult: Result,
@@ -187,6 +187,14 @@ class DecryptActivity : BasePGPActivity() {
     } else {
       finish()
     }
+    if (
+      !repository.isPasswordProtected(
+        withContext(dispatcherProvider.io()) { File(fullPath).readBytes().inputStream() }
+      )
+    ) {
+      decryptWithPassphrase(password = "", gpgIdentifiers = gpgIdentifiers)
+      return
+    }
     val dialog = PasswordDialog()
     if (isError) {
       dialog.setError()