/// <summary>
/// Verify a checksum.
/// </summary>
/// <param name="fullPath">The path to the file.</param>
public void VerifyChecksum(string fullPath)
{
MD5 md5 = new MD5CryptoServiceProvider();
if (md5.GetType().ToString().Equals(ChecksumType))
{
using (FileStream file = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
byte[] retVal = md5.ComputeHash(file);
file.Close();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < retVal.Length; i++)
{
sb.Append(retVal[i].ToString("x2"));
}
if (!Checksum.Equals(sb.ToString()))
{
throw new ApplicationException("Checksum does not match for file " + fullPath);
}
}
}
else
{
throw new ApplicationException("Unknown checksum type: " + ChecksumType);
}
}
/// <summary>
/// Generate a checksum.
/// </summary>
/// <param name="fullPath">The full path of the file to generate a checksum for.</param>
public void GenerateChecksum(string fullPath)
{
using (FileStream file = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
MD5 md5 = new MD5CryptoServiceProvider();
byte[] retVal = md5.ComputeHash(file);
file.Close();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < retVal.Length; i++)
{
sb.Append(retVal[i].ToString("x2"));
}
Checksum = sb.ToString();
ChecksumType = md5.GetType().ToString();
}
}
void Start()
{
byte[] data = { 0, 1, 2, 3, 4, 5, 6, 7 };
// 192B
{
using (var md5 = new MD5CryptoServiceProvider())
{
Profiler.BeginSample("ComputeHash");
var hash = md5.ComputeHash(data);
Profiler.EndSample();
Debug.Log(GetHashString(hash));
}
}
// 228B
{
using (var md5 = new MD5CryptoServiceProvider())
{
Profiler.BeginSample("TransformBlock");
md5.TransformBlock(data, 0, 4, null, 0);
md5.TransformBlock(data, 4, 4, null, 0);
md5.TransformFinalBlock(data, 0, 0);
var hash = md5.Hash;
Profiler.EndSample();
Debug.Log(GetHashString(hash));
}
}
{
byte[] data2 = new byte[1024 * 1024];
for (int i = 0; i < data2.Length; i++)
{
data2[i] = 0;
}
using (var md5 = new MD5CryptoServiceProvider())
{
// 0.5MB
int blockSize = 512 * 1024;
Profiler.BeginSample("TransformBlock 2");
int i = 0;
for (i = 0; i < data2.Length - blockSize; i += blockSize)
{
md5.TransformBlock(data2, i, blockSize, null, 0);
}
md5.TransformFinalBlock(data2, i, blockSize);
var hash = md5.Hash;
Profiler.EndSample();
Debug.Log(GetHashString(hash));
// 1MB
md5.Initialize();
Profiler.BeginSample("TransformBlock 3");
md5.TransformFinalBlock(data2, 0, data2.Length);
hash = md5.Hash;
Profiler.EndSample();
Debug.Log(GetHashString(hash));
// 192B
md5.Initialize();
Profiler.BeginSample("TransformBlock 4");
i = 0;
for (i = 0; i < data2.Length; i += blockSize)
{
md5.TransformBlock(data2, i, blockSize, null, 0);
}
md5.TransformFinalBlock(data2, 0, 0);
hash = md5.Hash;
Profiler.EndSample();
Debug.Log(GetHashString(hash));
}
}
// 320B
{
Profiler.BeginSample("MD5CryptoServiceProvider");
var md5 = new MD5CryptoServiceProvider();
Profiler.EndSample();
Debug.Log(md5.GetType());
}
// 1.5KB
{
Profiler.BeginSample("MD5.Create");
var md5 = MD5.Create();
Profiler.EndSample();
Debug.Log(md5.GetType());
}
}