public void AddActual(string name, byte[] storedActualHash, HashStyle hashStyle = HashStyle.Binary)
{
var item = new HashedFile(name, storedActualHash, hashStyle, storedActualHash);
Data.items.Add(item);
item.IsMatch = storedActualHash == null? (bool?)null : true;
}
private HashedFile(string name, byte[] storedHash, HashStyle style, byte[] actualHash = null)
{
this.storedHash = storedHash;
this.actualHash = actualHash;
this.FileName = name;
this.IsMatch = null;
this.IsFound = null;
this.IsRelative = !Path.IsPathRooted(name);
this.Style = style;
}
public void Add(string name, byte[] storedHash, HashStyle hashStyle) => Data.items.Add(new HashedFile(name, storedHash, hashStyle));
public async Task <string> HashFileAsync(
HashStyle hashStyle,
string fullPath)
{
switch (hashStyle)
{
case HashStyle.DropboxSHA256:
{
StorageFile file = await StorageFile.GetFileFromPathAsync(fullPath);
using (IRandomAccessStream input = await file.OpenReadAsync())
{
List <byte[]> hashes = new List <byte[]>();
using (SHA256 crypto = SHA256.Create())
{
bool moreData = true;
while (moreData)
{
byte[] bytes = new byte[4 * 1024 * 1024];
IBuffer read = await input.ReadAsync(bytes.AsBuffer(), (uint)input.Size, InputStreamOptions.None);
byte[] blockHash = crypto.ComputeHash(read.ToArray());
hashes.Add(blockHash);
moreData = !(read.Length < bytes.Length);
}
byte[] joined = hashes.SelectMany(byteArr => byteArr).ToArray();
byte[] totalHash = crypto.ComputeHash(joined);
string hex = BitConverter.ToString(totalHash).ToLower().Replace("-", String.Empty);
return(hex);
}
}
}
case HashStyle.OneDriveSHA1:
{
string shaHash = String.Empty;
StorageFile file = await StorageFile.GetFileFromPathAsync(fullPath);
using (SHA1Managed shaForStream = new SHA1Managed())
using (Stream sourceFileStream = await file.OpenStreamForReadAsync())
using (Stream sourceStream = new CryptoStream(sourceFileStream, shaForStream, CryptoStreamMode.Read))
{
//!!!Could this be optimised?
while (sourceStream.ReadByte() != -1)
{
;
}
shaHash = shaForStream.Hash.ToHexString().ToUpper();
}
return(shaHash);
}
case HashStyle.AmazonS3MD5:
{
string md5Hash = String.Empty;
StorageFile file = await StorageFile.GetFileFromPathAsync(fullPath);
using (MD5 md5ForStream = MD5.Create())
using (Stream sourceFileStream = await file.OpenStreamForReadAsync())
using (Stream sourceStream = new CryptoStream(sourceFileStream, md5ForStream, CryptoStreamMode.Read))
{
//!!!Could this be optimised?
while (sourceStream.ReadByte() != -1)
{
;
}
md5Hash = md5ForStream.Hash.ToHexString().ToUpper();
}
return(md5Hash);
}
default:
{
throw new NotImplementedException();
}
}
}
public static char GetStyleChar(HashStyle hashStyle) => styleChar[(int)hashStyle];
public async Task <string> HashFileAsync(
HashStyle hashStyle,
string fullPath)
{
switch (hashStyle)
{
case HashStyle.DropboxSHA256:
{
using (Stream input = File.OpenRead(fullPath))
{
List <byte[]> hashes = new List <byte[]>();
using (SHA256 crypto = SHA256.Create())
{
bool moreData = true;
while (moreData)
{
byte[] bytes = new byte[4 * 1024 * 1024];
int read = await input.ReadAsync(bytes, 0, bytes.Length);
byte[] blockHash = crypto.ComputeHash(bytes, 0, read);
hashes.Add(blockHash);
moreData = !(read < bytes.Length);
}
byte[] joined = hashes.SelectMany(byteArr => byteArr).ToArray();
byte[] totalHash = crypto.ComputeHash(joined);
string hex = BitConverter.ToString(totalHash).ToLower().Replace("-", String.Empty);
return(hex);
}
}
}
case HashStyle.OneDriveSHA1:
{
string shaHash = String.Empty;
using (SHA1Managed shaForStream = new SHA1Managed())
using (Stream sourceFileStream = File.Open(fullPath, FileMode.Open))
using (Stream sourceStream = new CryptoStream(sourceFileStream, shaForStream, CryptoStreamMode.Read))
{
//!!!Could this be optimised?
while (sourceStream.ReadByte() != -1)
{
;
}
shaHash = shaForStream.Hash.ToHexString().ToUpper();
}
return(shaHash);
}
case HashStyle.AmazonS3MD5:
{
string md5Hash = String.Empty;
using (MD5 md5ForStream = MD5.Create())
using (Stream sourceFileStream = File.Open(fullPath, FileMode.Open))
using (Stream sourceStream = new CryptoStream(sourceFileStream, md5ForStream, CryptoStreamMode.Read))
{
//!!!Could this be optimised?
while (sourceStream.ReadByte() != -1)
{
;
}
md5Hash = md5ForStream.Hash.ToHexString().ToUpper();
}
return(md5Hash);
}
default:
{
throw new NotImplementedException(String.Format("Hash style '{0}' is not supported by the native file handler.", hashStyle.ToString()));
}
}
}
