Created
June 30, 2023 16:53
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N-INNOCENCE
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| using System; | |
| using System.IO; | |
| using System.Security.Cryptography; | |
| using System.Text; | |
| string filePath = @"A"; // Replace with the path to your encrypted file | |
| string password = "4fTrch#60b<3aO48Vb"; | |
| string destinationFilePath = "path_to_decrypted_file"; | |
| string salt = Path.GetFileName(filePath); | |
| byte[] saltBytes = Encoding.UTF8.GetBytes(salt); | |
| using (Stream baseStream = File.OpenRead(filePath)) | |
| { | |
| using (FileStream sourceStream = File.OpenRead(filePath)) | |
| { | |
| using (FileStream destinationStream = File.OpenWrite(destinationFilePath)) | |
| { | |
| // Create an instance of SeekableAesStream using the source stream, password, and salt | |
| using (SeekableAesStream aesStream = new SeekableAesStream(sourceStream, password, saltBytes)) | |
| { | |
| // Read from the aesStream and write to the destination stream | |
| aesStream.CopyTo(destinationStream); | |
| } | |
| } | |
| } | |
| } | |
| public class SeekableAesStream : Stream | |
| { | |
| private Stream baseStream; | |
| private AesManaged aes; | |
| private ICryptoTransform encryptor; | |
| public bool autoDisposeBaseStream { get; set; } = true; | |
| /// <param name="salt">//** WARNING **: MUST be unique for each stream otherwise there is NO security</param> | |
| public SeekableAesStream(Stream baseStream, string password, byte[] salt) | |
| { | |
| this.baseStream = baseStream; | |
| using (var key = new Rfc2898DeriveBytes(password, salt)) | |
| { | |
| aes = new AesManaged(); | |
| aes.KeySize = 128; | |
| aes.Mode = CipherMode.ECB; | |
| aes.Padding = PaddingMode.None; | |
| aes.Key = key.GetBytes(aes.KeySize / 8); | |
| aes.IV = new byte[16]; //zero buffer is adequate since we have to use new salt for each stream | |
| encryptor = aes.CreateEncryptor(aes.Key, aes.IV); | |
| } | |
| } | |
| private void cipher(byte[] buffer, int offset, int count, long streamPos) | |
| { | |
| //find block number | |
| var blockSizeInByte = aes.BlockSize / 8; | |
| var blockNumber = (streamPos / blockSizeInByte) + 1; | |
| var keyPos = streamPos % blockSizeInByte; | |
| //buffer | |
| var outBuffer = new byte[blockSizeInByte]; | |
| var nonce = new byte[blockSizeInByte]; | |
| var init = false; | |
| for (int i = offset; i < count; i++) | |
| { | |
| //encrypt the nonce to form next xor buffer (unique key) | |
| if (!init || (keyPos % blockSizeInByte) == 0) | |
| { | |
| BitConverter.GetBytes(blockNumber).CopyTo(nonce, 0); | |
| encryptor.TransformBlock(nonce, 0, nonce.Length, outBuffer, 0); | |
| if (init) keyPos = 0; | |
| init = true; | |
| blockNumber++; | |
| } | |
| buffer[i] ^= outBuffer[keyPos]; //simple XOR with generated unique key | |
| keyPos++; | |
| } | |
| } | |
| public override bool CanRead { get { return baseStream.CanRead; } } | |
| public override bool CanSeek { get { return baseStream.CanSeek; } } | |
| public override bool CanWrite { get { return baseStream.CanWrite; } } | |
| public override long Length { get { return baseStream.Length; } } | |
| public override long Position { get { return baseStream.Position; } set { baseStream.Position = value; } } | |
| public override void Flush() { baseStream.Flush(); } | |
| public override void SetLength(long value) { baseStream.SetLength(value); } | |
| public override long Seek(long offset, SeekOrigin origin) { return baseStream.Seek(offset, origin); } | |
| public override int Read(byte[] buffer, int offset, int count) | |
| { | |
| var streamPos = Position; | |
| var ret = baseStream.Read(buffer, offset, count); | |
| cipher(buffer, offset, count, streamPos); | |
| return ret; | |
| } | |
| public override void Write(byte[] buffer, int offset, int count) | |
| { | |
| cipher(buffer, offset, count, Position); | |
| baseStream.Write(buffer, offset, count); | |
| } | |
| protected override void Dispose(bool disposing) | |
| { | |
| if (disposing) | |
| { | |
| encryptor?.Dispose(); | |
| aes?.Dispose(); | |
| if (autoDisposeBaseStream) | |
| baseStream?.Dispose(); | |
| } | |
| base.Dispose(disposing); | |
| } | |
| } |
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