public static string HashBytes(byte [] bytes)
{
using (HashAlgorithm hashAlg = new Crc64()) {
byte [] hash = hashAlg.ComputeHash(bytes);
return(ToHexString(hash));
}
}
public static string HashStream(Stream stream)
{
stream.Position = 0;
using (HashAlgorithm hashAlg = new Crc64()) {
byte[] hash = hashAlg.ComputeHash(stream);
return(ToHexString(hash));
}
}
protected bool FileCompare(string file1, string file2)
{
bool result = false;
result = File.Exists(file1) && File.Exists(file2);
if (result)
{
byte[] f1 = ReadAllBytesIgnoringLineEndings(file1);
byte[] f2 = ReadAllBytesIgnoringLineEndings(file2);
using (var hash = new Crc64()) {
var f1hash = Convert.ToBase64String(hash.ComputeHash(f1));
var f2hash = Convert.ToBase64String(hash.ComputeHash(f2));
result = string.Equals(f1hash, f2hash, StringComparison.Ordinal);
}
}
return(result);
}
static string ToHash(byte[] data)
{
using (var crc = new Crc64()) {
var hash = crc.ComputeHash(data);
var buf = new StringBuilder(hash.Length * 2);
foreach (var b in hash)
{
buf.AppendFormat("{0:x2}", b);
}
return(buf.ToString());
}
}
public void AllBytesAreProcessed()
{
// Slicing processes 8 bytes (a 64-bit word) at a time, and if any of the bytes are skipped we will have a
// collision here.
string[] inputs =
{
"obj/Debug/lp/10/jl/bin/classes.jar",
"obj/Debug/lp/11/jl/bin/classes.jar",
"obj/Debug/lp/12/jl/bin/classes.jar",
};
string[] expected =
{
"419a37c9bcfddf3c",
"6ea5e242b7cc24a7",
"74770a86f8b97020",
};
string[] outputs = new string[inputs.Length];
for (int i = 0; i < inputs.Length; i++)
{
byte[] bytes = Encoding.UTF8.GetBytes(inputs [i]);
using (HashAlgorithm hashAlg = new Crc64()) {
byte [] hash = hashAlg.ComputeHash(bytes);
outputs[i] = ToHash(hash);
Assert.AreEqual(expected[i], outputs[i], $"hash {i} differs");
}
}
for (int i = 0; i < outputs.Length; i++)
{
for (int j = 0; j < outputs.Length; j++)
{
if (j == i)
{
continue;
}
Assert.AreNotEqual(outputs[i], outputs[j], $"Outputs {i} and {j} are identical");
}
}
}
internal static string GetHashCore(KernelTransaction transaction, string fileFullPath, HashType hashType, PathFormat pathFormat)
{
var options = GetFullPathOptions.RemoveTrailingDirectorySeparator | GetFullPathOptions.FullCheck;
var fileNameLp = Path.GetExtendedLengthPathCore(transaction, fileFullPath, pathFormat, options);
byte[] hash = null;
using (var fs = OpenCore(transaction, fileNameLp, FileMode.Open, FileAccess.Read, FileShare.Read, ExtendedFileAttributes.Normal, null, null, PathFormat.LongFullPath))
{
switch (hashType)
{
case HashType.CRC32:
using (var hType = new Crc32())
hash = hType.ComputeHash(fs);
break;
case HashType.CRC64ISO3309:
using (var hType = new Crc64())
hash = hType.ComputeHash(fs);
break;
case HashType.MD5:
using (var hType = System.Security.Cryptography.MD5.Create())
hash = hType.ComputeHash(fs);
break;
case HashType.RIPEMD160:
using (var hType = System.Security.Cryptography.RIPEMD160.Create())
hash = hType.ComputeHash(fs);
break;
case HashType.SHA1:
using (var hType = System.Security.Cryptography.SHA1.Create())
hash = hType.ComputeHash(fs);
break;
case HashType.SHA256:
using (var hType = System.Security.Cryptography.SHA256.Create())
hash = hType.ComputeHash(fs);
break;
case HashType.SHA384:
using (var hType = System.Security.Cryptography.SHA384.Create())
hash = hType.ComputeHash(fs);
break;
case HashType.SHA512:
using (var hType = System.Security.Cryptography.SHA512.Create())
hash = hType.ComputeHash(fs);
break;
}
}
if (null != hash)
{
var sb = new StringBuilder(hash.Length);
foreach (byte b in hash)
{
sb.Append(b.ToString("X2", CultureInfo.InvariantCulture));
}
return(sb.ToString().ToUpperInvariant());
}
return(string.Empty);
}