#380 Use exception type WRONG_PASSWORD when password is null or empty for AES

Author: srikanth-lingala

src/main/java/net/lingala/zip4j/crypto/AESDecrypter.java

@@ -25,6 +25,7 @@
 import java.util.Arrays;
 
 import static net.lingala.zip4j.crypto.AesCipherUtil.prepareBuffAESIVBytes;
+import static net.lingala.zip4j.exception.ZipException.Type.WRONG_PASSWORD;
 import static net.lingala.zip4j.util.InternalZipConstants.AES_BLOCK_SIZE;
 
 /**
@@ -49,7 +50,7 @@ private void init(byte[] salt, byte[] passwordVerifier, char[] password, AESExtr
       throws ZipException {
 
     if (password == null || password.length <= 0) {
-      throw new ZipException("empty or null password provided for AES decryption");
+      throw new ZipException("empty or null password provided for AES decryption", WRONG_PASSWORD);
     }
 
     final AesKeyStrength aesKeyStrength = aesExtraDataRecord.getAesKeyStrength();

src/test/java/net/lingala/zip4j/ExtractZipFileIT.java

@@ -668,6 +668,16 @@ public void testExtractZipFileByFileNameWhichTheDirectoryEntryAtTheEndOfCentralD
     zipFile.extractFile("test-files/", outputFolder.getPath());
   }
 
+  @Test
+  public void testExtractZipFileThrowsExceptionOfTypeWrongPasswordForNullAesPassword() throws ZipException {
+    testExtractZipFileThrowsExceptionOfTypeWrongPasswordForNullOrEmptyAesPassword(null);
+  }
+
+  @Test
+  public void testExtractZipFileThrowsExceptionOfTypeWrongPasswordForEmptyAesPassword() throws ZipException {
+    testExtractZipFileThrowsExceptionOfTypeWrongPasswordForNullOrEmptyAesPassword("".toCharArray());
+  }
+
   private void addFileToZip(ZipFile zipFile, String fileName, EncryptionMethod encryptionMethod, String password) throws ZipException {
     ZipParameters zipParameters = new ZipParameters();
     zipParameters.setEncryptFiles(encryptionMethod != null);
@@ -795,4 +805,15 @@ private List<File> getRegularFilesFromFolder(File folder) throws ZipException {
     }
     return regularFiles;
   }
+
+  private void testExtractZipFileThrowsExceptionOfTypeWrongPasswordForNullOrEmptyAesPassword(char[] password) throws ZipException {
+    ZipFile zipFile = new ZipFile(generatedZipFile, PASSWORD);
+    addFileToZip(zipFile, "sample.pdf", EncryptionMethod.AES, new String(PASSWORD));
+
+    expectedException.expect(ZipException.class);
+    expectedException.expectMessage("empty or null password provided for AES decryption");
+
+    zipFile = new ZipFile(generatedZipFile, password);
+    zipFile.extractAll(outputFolder.getPath());
+  }
 }