namespace CryptoFile
open System.IO
-type internal Metadata (d : (string * string) list) =
+type internal Metadata (d: (string * string) list) =
new (stream : Stream, size: int) =
let binaryReader = new BinaryReader (stream)
new Metadata ([])
+
member this.WriteTo (stream : Stream) =
- let binaryWriter = new BinaryWriter (stream)
- List.iter (fun (key : string, value : string) -> binaryWriter.Write key; binaryWriter.Write value) d
+ let memoryStream = new MemoryStream () // To know the serialized meta-data size before writtent them to 'stream'.
+ let memoryWriter = new BinaryWriter (memoryStream)
+ List.iter (fun (key : string, value : string) -> memoryWriter.Write key; memoryWriter.Write value) d
+ (new BinaryWriter (stream)).Write (int memoryStream.Length)
+ memoryStream.CopyTo (stream)
module API =
- let internal filename = "filename"
- let internal creationTimeKey = "file-creation-time"
+ module internal MetaData =
+ let filename = "filename"
+ let creationTimeKey = "file-creation-time"
let generatKeysPair : Key * Key = Crypto.generateRSAKeysPair
+ // Encrypt a given file
let encryptFile (inputFilePath : string) (outputFilePath : string) (signaturePrivKey: Key) (cryptPubKey : Key) =
let keyAES, keyMAC, iv = Crypto.rand 32, Crypto.rand 32, Crypto.rand 16
let fileInfo = new FileInfo (inputFilePath)
use outputStream = new FileStream (outputFilePath, FileMode.Create, FileAccess.Write)
let writer = new BinaryWriter (outputStream)
- ignore <| writer.Seek (8 + 32 + 256, SeekOrigin.Current) // Skips file-content-size, mac and signature. They will be written later.
+ writer.Seek (32 + 256, SeekOrigin.Current) |> ignore // Skips mac and signature. They will be written later.
Crypto.encryptRSA cryptPubKey (Array.append keyAES <| Array.append keyMAC iv) |> writer.Write
- printfn "pos: %A" outputStream.Position
-
- use cryptoStream = Crypto.encryptAES keyAES iv outputStream
+ let (hmacStream, hmac) = Crypto.HMACStream keyMAC outputStream
+ use cryptoStream = Crypto.encryptAES keyAES iv hmacStream
let cryptoWriter = new BinaryWriter (cryptoStream)
- // Write metadata.
- let metaData = new Metadata ([filename, fileInfo.Name; creationTimeKey, fileInfo.CreationTimeUtc.Ticks.ToString ()])
- let metaDataStream = new MemoryStream ()
- metaData.WriteTo metaDataStream
- cryptoWriter.Write (int metaDataStream.Length)
- printfn "meta size: %A" (int metaDataStream.Length)
- metaDataStream.Position <- 0L
- metaDataStream.CopyTo cryptoStream
+ // Write the file metadata.
+ let metaData = new Metadata ([MetaData.filename, fileInfo.Name
+ MetaData.creationTimeKey, fileInfo.CreationTimeUtc.Ticks.ToString ()])
+ metaData.WriteTo cryptoStream
+
+ // Write the content of the file.
+ inputStream.CopyTo cryptoStream
+ cryptoStream.FlushFinalBlock ()
+
+ // Write the HMAC at the begining of the file.
+ outputStream.Position <- 0L
+ writer.Write hmac.Hash
+
+ // Write the signature.
+ Crypto.signRSA signaturePrivKey hmac.Hash |> writer.Write
()
let decryptFile (sourceFilePath : string) (targetDirPath : string) (signaturePubKey: Key) (decryptPrivKey : Key) =
- ()
+ ()
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