public void MD5ComparisonTest()
{
CloudStorageAccount.UseV1MD5 = false;
try
{
using (MD5Wrapper nativeHash = new MD5Wrapper())
{
nativeHash.UpdateHash(data, 0, data.Length);
string nativeResult = nativeHash.ComputeHash();
MD5 hash = MD5.Create();
hash.TransformBlock(data, 0, data.Length, null, 0);
hash.TransformFinalBlock(new byte[0], 0, 0);
byte[] bytes = hash.Hash;
string result = Convert.ToBase64String(bytes);
Assert.AreEqual(nativeResult, result);
}
}
finally
{
CloudStorageAccount.UseV1MD5 = true;
}
}
private string GenerateBlockIdPrefix()
{
//var blockIdPrefix = Guid.NewGuid().ToString("N") + "-";
// Originally the blockId is an GUID + "-". It will cause some problem when switch machines or jnl get cleaned
// to upload to the same block blob - block id is not shared between the 2 DMLib instances
// and it may result in reaching the limitation of maximum 50000 uncommited blocks + 50000 committed blocks.
//
// Change it to hash based prefix to make it preditable and can be shared between multiple DMLib instances
string blobNameHash;
using (var md5 = new MD5Wrapper())
{
var blobNameBytes = Encoding.UTF8.GetBytes(this.destLocation.Blob.Name);
md5.UpdateHash(blobNameBytes, 0, blobNameBytes.Length);
blobNameHash = md5.ComputeHash();
}
// The original GUID format prefix's length is 32 + 1 ("-")
// As the service requires the blockid has the same size of each block,
// To keep the compatibility, add 9 chars to the end of the hash ( 33 - 24)
var blockIdPrefix = blobNameHash + "12345678-";
return(blockIdPrefix);
}
public void MD5SingleByteTest()
{
MD5Wrapper nativeHash = new MD5Wrapper();
nativeHash.UpdateHash(data, 3, 2);
string nativeResult = nativeHash.ComputeHash();
MD5 hash = MD5.Create();
hash.TransformBlock(data, 3, 2, null, 0);
hash.TransformFinalBlock(new byte[0], 0, 0);
var bytes = hash.Hash;
string result = Convert.ToBase64String(bytes);
Assert.AreEqual(nativeResult, result);
}
public void MD5V1ComparisonTest()
{
using (MD5Wrapper nativeHash = new MD5Wrapper())
{
nativeHash.UpdateHash(data, 0, data.Length);
string nativeResult = nativeHash.ComputeHash();
MD5 hash = MD5.Create();
hash.TransformBlock(data, 0, data.Length, null, 0);
hash.TransformFinalBlock(new byte[0], 0, 0);
byte[] bytes = hash.Hash;
string result = Convert.ToBase64String(bytes);
Assert.AreEqual(nativeResult, result);
}
}
public void MD5EmptyArrayTest()
{
byte[] data = new byte[] { };
MD5Wrapper nativeHash = new MD5Wrapper();
nativeHash.UpdateHash(data, 0, data.Length);
string nativeResult = nativeHash.ComputeHash();
MD5 hash = MD5.Create();
hash.ComputeHash(data, 0, data.Length);
var varResult = hash.Hash;
string result = Convert.ToBase64String(varResult);
Assert.AreEqual(nativeResult, result);
}
/// <summary>
/// Computes the hash value for this stream.
/// </summary>
/// <returns>String representation of the computed hash value.</returns>
public string ComputeMD5Hash()
{
using (MD5Wrapper md5 = new MD5Wrapper())
{
// Maximum amount you can read is from current spot to the end.
long leftToRead = this.Length - this.Position;
while (leftToRead != 0)
{
ArraySegment <byte> currentBlock = this.GetCurrentBlock();
// Update hash with the block
int blockReadLength = (int)Math.Min(leftToRead, currentBlock.Count);
md5.UpdateHash(currentBlock.Array, currentBlock.Offset, blockReadLength);
this.AdvancePosition(ref leftToRead, blockReadLength);
}
return(md5.ComputeHash());
}
}
/// <summary>
/// Computes the hash value for this stream.
/// </summary>
/// <returns>String representation of the computed hash value.</returns>
public string ComputeMD5Hash()
{
using (MD5Wrapper md5 = new MD5Wrapper())
{
// Maximum amount you can read is from current spot to the end.
long leftToRead = this.Length - this.Position;
while (leftToRead != 0)
{
ArraySegment<byte> currentBlock = this.GetCurrentBlock();
// Update hash with the block
int blockReadLength = (int)Math.Min(leftToRead, currentBlock.Count);
md5.UpdateHash(currentBlock.Array, currentBlock.Offset, blockReadLength);
this.AdvancePosition(ref leftToRead, blockReadLength);
}
return md5.ComputeHash();
}
}
public void MD5BigDataTest()
{
byte[] data = new byte[10000];
for (int i = 1; i < 10000; i++)
{
data[i] = 1;
}
using (MD5Wrapper nativeHash = new MD5Wrapper())
{
MD5 hash = MD5.Create();
for (int i = 0; i < 999; i++)
{
int index = 10 * i;
nativeHash.UpdateHash(data, 0, 10);
hash.TransformBlock(data, 0, 10, null, 0);
}
string nativeResult = nativeHash.ComputeHash();
hash.TransformFinalBlock(new byte[0], 0, 0);
var varResult = hash.Hash;
String result = Convert.ToBase64String(varResult);
Assert.AreEqual(nativeResult, result);
}
}
public void MD5LastByteTest()
{
using (MD5Wrapper nativeHash = new MD5Wrapper())
{
nativeHash.UpdateHash(data, 8, 1);
string nativeResult = nativeHash.ComputeHash();
MD5 hash = MD5.Create();
hash.ComputeHash(data, 8, 1);
var varResult = hash.Hash;
string result = Convert.ToBase64String(varResult);
Assert.AreEqual(nativeResult, result);
}
}
public void MD5LastByteTest()
{
CloudStorageAccount.UseV1MD5 = false;
try
{
using (MD5Wrapper nativeHash = new MD5Wrapper())
{
nativeHash.UpdateHash(data, 8, 1);
string nativeResult = nativeHash.ComputeHash();
MD5 hash = MD5.Create();
hash.ComputeHash(data, 8, 1);
byte[] varResult = hash.Hash;
string result = Convert.ToBase64String(varResult);
Assert.AreEqual(nativeResult, result);
}
}
finally
{
CloudStorageAccount.UseV1MD5 = true;
}
}