public static byte[] HashRaw(EHashType type, byte[] bs, int index, int length)
{
if (bs == null)
{
return(null);
}
HashAlgorithm cmd5 = null;
switch (type)
{
case EHashType.Md5: cmd5 = new MD5CryptoServiceProvider(); break;
case EHashType.Sha1: cmd5 = new SHA1CryptoServiceProvider(); break;
case EHashType.Sha256: cmd5 = new SHA256CryptoServiceProvider(); break;
case EHashType.Sha384: cmd5 = new SHA384CryptoServiceProvider(); break;
case EHashType.Sha512: cmd5 = new SHA512CryptoServiceProvider(); break;
}
bs = cmd5.ComputeHash(bs, index, length);
cmd5.Dispose();
return(bs);
}
public static byte[] HashRaw(EHashType type, Stream bs, bool seekBegin)
{
if (bs == null)
{
return(null);
}
HashAlgorithm cmd5 = null;
switch (type)
{
case EHashType.Md5: cmd5 = new MD5CryptoServiceProvider(); break;
case EHashType.Sha1: cmd5 = new SHA1CryptoServiceProvider(); break;
case EHashType.Sha256: cmd5 = new SHA256CryptoServiceProvider(); break;
case EHashType.Sha384: cmd5 = new SHA384CryptoServiceProvider(); break;
case EHashType.Sha512: cmd5 = new SHA512CryptoServiceProvider(); break;
}
if (seekBegin)
{
bs.Seek(0, SeekOrigin.Begin);
}
byte[] bsh = cmd5.ComputeHash(bs);
cmd5.Dispose();
return(bsh);
}
private static bool VerifyChecksum(byte[] raw, XISFChecksumTypeEnum cksumType, string providedCksum)
{
string computedCksum;
SHA3Managed sha3;
using (MyStopWatch.Measure($"XISF Checksum = {cksumType}")) {
switch (cksumType)
{
case XISFChecksumTypeEnum.SHA1:
SHA1 sha1 = new SHA1CryptoServiceProvider();
computedCksum = GetStringFromHash(sha1.ComputeHash(raw));
sha1.Dispose();
break;
case XISFChecksumTypeEnum.SHA256:
SHA256 sha256 = new SHA256CryptoServiceProvider();
computedCksum = GetStringFromHash(sha256.ComputeHash(raw));
sha256.Dispose();
break;
case XISFChecksumTypeEnum.SHA512:
SHA512 sha512 = new SHA512CryptoServiceProvider();
computedCksum = GetStringFromHash(sha512.ComputeHash(raw));
sha512.Dispose();
break;
case XISFChecksumTypeEnum.SHA3_256:
sha3 = new SHA3Managed(256);
computedCksum = GetStringFromHash(sha3.ComputeHash(raw));
sha3.Dispose();
break;
case XISFChecksumTypeEnum.SHA3_512:
sha3 = new SHA3Managed(512);
computedCksum = GetStringFromHash(sha3.ComputeHash(raw));
sha3.Dispose();
break;
default:
return(false);
}
}
if (computedCksum.Equals(providedCksum))
{
return(true);
}
else
{
Logger.Error($"XISF: Invalid data block checksum! Expected: {providedCksum} Got: {computedCksum}");
return(false);
}
}
/// <summary>
/// Hash 值检查
/// </summary>
/// <param name="resFile">文件路径</param>
/// <param name="type">Hash 值的类型</param>
public CheckHash(string resFile, HashType type)
{
hashValue = string.Empty;
byte[] retVal = null;
FileStream file = new FileStream(resFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
switch (type)
{
case HashType.MD5:
MD5CryptoServiceProvider MD5Hash = new MD5CryptoServiceProvider();
retVal = MD5Hash.ComputeHash(file);
MD5Hash.Dispose();
break;
case HashType.SHA1:
SHA1CryptoServiceProvider SHA1Hash = new SHA1CryptoServiceProvider();
retVal = SHA1Hash.ComputeHash(file);
SHA1Hash.Dispose();
break;
case HashType.SHA256:
SHA256CryptoServiceProvider SHA256Hash = new SHA256CryptoServiceProvider();
retVal = SHA256Hash.ComputeHash(file);
SHA256Hash.Dispose();
break;
case HashType.SHA384:
SHA384CryptoServiceProvider SHA384Hash = new SHA384CryptoServiceProvider();
retVal = SHA384Hash.ComputeHash(file);
SHA384Hash.Dispose();
break;
case HashType.SHA512:
SHA512CryptoServiceProvider SHA512Hash = new SHA512CryptoServiceProvider();
retVal = SHA512Hash.ComputeHash(file);
SHA512Hash.Dispose();
break;
}
file.Close();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < retVal.Length; i++)
{
sb.Append(retVal[i].ToString("x2"));
}
hashValue = sb.ToString();
}
/// <summary>
/// SHA512 加密
/// </summary>
public static string Sha512(string dataStr, Encoding encoding)
{
if (string.IsNullOrEmpty(dataStr))
{
return(string.Empty);
}
SHA512 sha512 = new SHA512CryptoServiceProvider();
byte[] hashStr = sha512.ComputeHash(encoding.GetBytes(dataStr));
StringBuilder sb = new StringBuilder();
foreach (byte btStr in hashStr)
{
sb.AppendFormat("{0:X2}", btStr);
}
sha512.Dispose();
return(sb.ToString());
}
public TripleDesProvider(string seed)
{
// build a unique yet reproducable set of characters taken from our seed to use as a salt
for (int i = 0; i < seed.Length; i++)
{
if (i % 3 == 0)
{
_salt += seed[i].ToString();
}
}
// get a 64byte hash of our salt, we will use this as the salt byte array to generate the 24byte hash from our seed
SHA512CryptoServiceProvider sha = new SHA512CryptoServiceProvider();
_saltBytes = sha.ComputeHash(Encoding.UTF8.GetBytes(_salt));
sha.Dispose();
// generate our final key, and assign to our 3DES object.
_keyBytes = new Rfc2898DeriveBytes(seed, _saltBytes, 1000).GetBytes(24);
_tdesCrypto = new TripleDESCryptoServiceProvider();
_tdesCrypto.Key = _keyBytes;
_tdesCrypto.Mode = CipherMode.CBC;
}
/// <summary>
/// Convert the ushort array to a byte arraay, compressing with the requested algorithm if required
/// </summary>
/// <param name="data"></param>
/// <returns>Uncompressed or compressed byte array</returns>
private byte[] PrepareArray(ushort[] data)
{
byte[] outArray;
/*
* Convert the ushort[] into a byte[]
* From here onwards we deal in byte arrays only
*/
byte[] byteArray = new byte[data.Length * ShuffleItemSize];
Buffer.BlockCopy(data, 0, byteArray, 0, data.Length * ShuffleItemSize);
/*
* Compress the data block as configured.
*/
using (MyStopWatch.Measure($"XISF Compression = {CompressionType}")) {
if (CompressionType == XISFCompressionTypeEnum.LZ4)
{
if (ByteShuffling)
{
CompressionName = "lz4+sh";
byteArray = Shuffle(byteArray, ShuffleItemSize);
}
else
{
CompressionName = "lz4";
}
byte[] tmpArray = new byte[LZ4Codec.MaximumOutputSize(byteArray.Length)];
int compressedSize = LZ4Codec.Encode(byteArray, 0, byteArray.Length, tmpArray, 0, tmpArray.Length, LZ4Level.L00_FAST);
outArray = new byte[compressedSize];
Array.Copy(tmpArray, outArray, outArray.Length);
tmpArray = null;
}
else if (CompressionType == XISFCompressionTypeEnum.LZ4HC)
{
if (ByteShuffling)
{
CompressionName = "lz4hc+sh";
byteArray = Shuffle(byteArray, ShuffleItemSize);
}
else
{
CompressionName = "lz4hc";
}
byte[] tmpArray = new byte[LZ4Codec.MaximumOutputSize(byteArray.Length)];
int compressedSize = LZ4Codec.Encode(byteArray, 0, byteArray.Length, tmpArray, 0, tmpArray.Length, LZ4Level.L06_HC);
outArray = new byte[compressedSize];
Array.Copy(tmpArray, outArray, outArray.Length);
tmpArray = null;
}
else if (CompressionType == XISFCompressionTypeEnum.ZLIB)
{
if (ByteShuffling)
{
CompressionName = "zlib+sh";
byteArray = Shuffle(byteArray, ShuffleItemSize);
}
else
{
CompressionName = "zlib";
}
outArray = ZlibStream.CompressBuffer(byteArray);
}
else
{
outArray = new byte[byteArray.Length];
Array.Copy(byteArray, outArray, outArray.Length);
CompressionName = null;
}
}
// Revert to the original data array in case the compression is bigger than uncompressed
if (outArray.Length > byteArray.Length)
{
if (ByteShuffling)
{
//As the original array is shuffled it needs to be unshuffled again - this scenario should be highly unlikely anyways
outArray = Unshuffle(byteArray, ShuffleItemSize);
}
else
{
outArray = byteArray;
}
CompressionType = XISFCompressionTypeEnum.NONE;
Logger.Debug("XISF output array is larger after compression. Image will be prepared uncompressed instead.");
}
if (CompressionType != XISFCompressionTypeEnum.NONE)
{
double percentChanged = (1 - ((double)outArray.Length / (double)byteArray.Length)) * 100;
Logger.Debug($"XISF: {CompressionType} compressed {byteArray.Length} bytes to {outArray.Length} bytes ({percentChanged.ToString("#.##")}%)");
}
/*
* Checksum the data block as configured.
* If the data block is compressed, we always checksum the compressed form, not the uncompressed form.
*/
using (MyStopWatch.Measure($"XISF Checksum = {ChecksumType}")) {
SHA3Managed sha3;
switch (ChecksumType)
{
case XISFChecksumTypeEnum.SHA1:
SHA1 sha1 = new SHA1CryptoServiceProvider();
Checksum = GetStringFromHash(sha1.ComputeHash(outArray));
ChecksumName = "sha-1";
sha1.Dispose();
break;
case XISFChecksumTypeEnum.SHA256:
SHA256 sha256 = new SHA256CryptoServiceProvider();
Checksum = GetStringFromHash(sha256.ComputeHash(outArray));
ChecksumName = "sha-256";
sha256.Dispose();
break;
case XISFChecksumTypeEnum.SHA512:
SHA512 sha512 = new SHA512CryptoServiceProvider();
Checksum = GetStringFromHash(sha512.ComputeHash(outArray));
ChecksumName = "sha-512";
sha512.Dispose();
break;
case XISFChecksumTypeEnum.SHA3_256:
sha3 = new SHA3Managed(256);
Checksum = GetStringFromHash(sha3.ComputeHash(outArray));
ChecksumName = "sha3-256";
sha3.Dispose();
break;
case XISFChecksumTypeEnum.SHA3_512:
sha3 = new SHA3Managed(512);
Checksum = GetStringFromHash(sha3.ComputeHash(outArray));
ChecksumName = "sha3-512";
sha3.Dispose();
break;
case XISFChecksumTypeEnum.NONE:
default:
Checksum = null;
ChecksumName = null;
break;
}
}
return(outArray);
}
