Crisis.Ionic.Zip.ZipEntry.VerifyCrcAfterExtract C# (CSharp) Method

        internal void VerifyCrcAfterExtract(Int32 actualCrc32)
        {

#if AESCRYPTO
                // After extracting, Validate the CRC32
                if (actualCrc32 != _Crc32)
                {
                    // CRC is not meaningful with WinZipAES and AES method 2 (AE-2)
                    if ((Encryption != EncryptionAlgorithm.WinZipAes128 &&
                         Encryption != EncryptionAlgorithm.WinZipAes256)
                        || _WinZipAesMethod != 0x02)
                        throw new BadCrcException("CRC error: the file being extracted appears to be corrupted. " +
                                                  String.Format("Expected 0x{0:X8}, Actual 0x{1:X8}", _Crc32, actualCrc32));
                }

                // ignore MAC if the size of the file is zero
                if (this.UncompressedSize == 0)
                    return;

                // calculate the MAC
                if (Encryption == EncryptionAlgorithm.WinZipAes128 ||
                    Encryption == EncryptionAlgorithm.WinZipAes256)
                {
                    WinZipAesCipherStream wzs = _inputDecryptorStream as WinZipAesCipherStream;
                    _aesCrypto_forExtract.CalculatedMac = wzs.FinalAuthentication;

                    _aesCrypto_forExtract.ReadAndVerifyMac(this.ArchiveStream); // throws if MAC is bad
                    // side effect: advances file position.
                }




#else
            if (actualCrc32 != _Crc32)
                throw new BadCrcException("CRC error: the file being extracted appears to be corrupted. " +
                                          String.Format("Expected 0x{0:X8}, Actual 0x{1:X8}", _Crc32, actualCrc32));
#endif
        }