public void TestNullStreamThrowException()
{
Assert.ThrowsException <ArgumentNullHashLibException>(() => hash.ComputeStream(null));
//
hash.Initialize();
Assert.ThrowsException <ArgumentNullHashLibException>(() => hash.TransformStream(null));
hash.TransformFinal();
}
} // end function
public static void TestEmptyStream(string expected, IHash hash)
{
Stream stream;
string ActualString;
stream = new MemoryStream();
ActualString = hash.ComputeStream(stream).ToString();
Assert.AreEqual(expected, ActualString,
String.Format("Expected {0} but got {1}.",
expected, ActualString));
stream.Close(); // close stream
} // end function
protected void TestHashStream(IHash a_hash, int a_block_size)
{
int old = Hash.BUFFER_SIZE;
Hash.BUFFER_SIZE = a_block_size;
try
{
for (int i = 1; i < 10; i++)
{
byte[] data = new byte[13 * i];
new Random().NextBytes(data);
using (MemoryStream ms = new MemoryStream(data))
{
HashResult h1 = a_hash.ComputeBytes(data);
HashResult h2 = a_hash.ComputeStream(ms);
Assert.AreEqual(h1, h2);
h1 = a_hash.ComputeBytes(HashLib.ArrayExtensions.SubArray(data, i, i * 7));
ms.Seek(i, SeekOrigin.Begin);
h2 = a_hash.ComputeStream(ms, i * 7);
Assert.AreEqual(h1, h2);
h1 = a_hash.ComputeBytes(data);
a_hash.Initialize();
a_hash.TransformBytes(data, 0, i * 3);
ms.Seek(i * 3, SeekOrigin.Begin);
a_hash.TransformStream(ms, i * 2);
a_hash.TransformBytes(data, i * 5);
h2 = a_hash.TransformFinal();
Assert.AreEqual(h1, h2);
}
}
int[] sizes = { 1, 11, 63, 64, 65, 127, 128, 129, 255, 256, 257, 511, 512, 513,
1023, 1024, 1025, 4011, 64000, 66000, 250000, Hash.BUFFER_SIZE * 20 + 511 };
foreach (int size in sizes)
{
byte[] data = new byte[size];
new Random().NextBytes(data);
using (MemoryStream ms = new MemoryStream(data))
{
HashResult h1 = a_hash.ComputeBytes(data);
HashResult h2 = a_hash.ComputeStream(ms);
Assert.AreEqual(h1, h2);
}
}
{
byte[] data = new byte[1011];
new Random().NextBytes(data);
using (MemoryStream ms = new MemoryStream(data))
{
bool ex = false;
try
{
ms.Position = 1011;
a_hash.ComputeStream(ms, -1);
}
catch
{
ex = true;
}
Assert.IsFalse(ex);
ex = false;
try
{
ms.Position = 1010;
a_hash.ComputeStream(ms, 2);
}
catch
{
ex = true;
}
Assert.IsTrue(ex);
try
{
ms.Position = 0;
a_hash.ComputeStream(ms, 1012);
}
catch
{
ex = true;
}
Assert.IsTrue(ex);
}
}
}
finally
{
Hash.BUFFER_SIZE = old;
}
}
public static void Main(string[] args)
{
// Prepare temp file.
string file_name = Path.GetTempFileName();
using (var fs = new FileStream(file_name, FileMode.Open))
{
byte[] v = new byte[256];
new Random().NextBytes(v);
fs.Write(v, 0, v.Length);
}
// Prepare stream.
MemoryStream ms = new MemoryStream(new byte[] { 2, 3, 4, 5, 6, 7 });
// Choose algorithm. Explore HashFactory for more algorithms.
IHash hash = HashFactory.Crypto.CreateSHA256();
// Hash data immediate.
HashResult r = hash.ComputeString("test", Encoding.ASCII);
// Hash data.
hash.Initialize(); // Not mandatory after Compute and TransformFinal
hash.TransformULong(6);
hash.TransformString("test");
r = hash.TransformFinal();
// Calculate 32-bits hash.
hash = HashFactory.Checksum.CreateCRC32_IEEE();
uint crc32 = hash.ComputeString("test", Encoding.ASCII).GetUInt();
// For CRCs you may specify parameters.
hash = HashFactory.Checksum.CreateCRC32(
HashLib.Checksum.CRC32Polynomials.IEEE_802_3, uint.MaxValue, uint.MaxValue);
hash = HashFactory.Checksum.CreateCRC32(
0xF0F0F0F0, uint.MaxValue, uint.MaxValue);
// Most hashes can be created in two ways.
hash = HashFactory.Crypto.CreateHaval(HashRounds.Rounds3, HashSize.HashSize256);
hash = HashFactory.Crypto.CreateHaval_3_256();
// Calculate 64-bits hash.
hash = HashFactory.Hash64.CreateMurmur2();
ulong crc64 = hash.ComputeString("test", Encoding.ASCII).GetULong();
// Calculate hash with key.
var hash_with_key = HashFactory.Hash128.CreateMurmur3_128();
hash_with_key.Key = new MersenneTwister().NextBytes(hash_with_key.KeyLength.Value);
r = hash_with_key.ComputeString("test", Encoding.ASCII);
// This will restore default key.
hash_with_key.Key = null;
// Get some information about algorithm. BlockSize has only informative meaning.
System.Console.WriteLine("{0}, {1}, {2}", hash.BlockSize, hash.HashSize, hash.Name);
// Here you can find algorithms grouped by its properties.
foreach (var h in Hashes.CryptoAll)
{
System.Console.WriteLine(((IHash)Activator.CreateInstance(h)).Name);
}
foreach (var h in Hashes.CryptoNotBuildIn)
{
System.Console.WriteLine(((IHash)Activator.CreateInstance(h)).Name);
}
foreach (var h in Hashes.CryptoBuildIn)
{
System.Console.WriteLine(((IHash)Activator.CreateInstance(h)).Name);
}
foreach (var h in Hashes.Checksums)
{
System.Console.WriteLine(((IHash)Activator.CreateInstance(h)).Name);
}
// ... And more
// Hash stream.
r = hash.ComputeStream(ms);
ms.Position = 2;
r = hash.ComputeStream(ms); // Compute all bytes starting from 2
ms.Position = 3;
r = hash.ComputeStream(ms, 2); // Compute 2 bytes starting from 3
hash.TransformInt(111);
ms.Position = 0;
hash.TransformStream(ms);
r = hash.TransformFinal();
// Hash file
r = hash.ComputeFile(file_name);
r = hash.ComputeFile(file_name, 10); // Compute all bytes starting from 10
r = hash.ComputeFile(file_name, 12, 10); // Compute 10 bytes starting from 12.
hash.TransformInt(111);
hash.TransformFile(file_name);
r = hash.TransformFinal();
// Calculate HMAC.
IHMAC hmac = HashFactory.HMAC.CreateHMAC(HashFactory.Crypto.CreateSHA256());
hmac.Key = Converters.ConvertStringToBytes("secret", Encoding.ASCII);
r = hmac.ComputeString("test", Encoding.ASCII);
Debug.Assert(hmac.KeyLength == null, "NULL means key can be any length");
// Get System.Security.Cryptography.HashAlgorithm wrapper for algorithms from this library.
System.Security.Cryptography.HashAlgorithm hash2 = HashFactory.Wrappers.HashToHashAlgorithm(hash);
// And back.
hash = HashFactory.Wrappers.HashAlgorithmToHash(hash2);
// Some algorithms have fast specialized methods for calculating hashes for all data types.
// They are designed for calculating good-behaving hash codes for hash-tables.
hash = HashFactory.Hash32.CreateMurmur2();
Debug.Assert(hash is IFastHash32);
// Some algorithms can calculated hashes only when they had all needed data,
// they accumulated data to the very end.
hash = HashFactory.Hash32.CreateMurmur2();
Debug.Assert(hash is INonBlockHash);
// Use build-in cryptography hash algorithms.
hash = HashFactory.Crypto.BuildIn.CreateSHA256Cng();
// Delete temp file.
new FileInfo(file_name).Delete();
}
protected void TestHashStreamValueType(IHash a_hash_stream, IHash a_hash)
{
string file_name = Path.GetTempFileName();
int ratio = (TEST_BLOCK_SIZE * 3 / 2) / 9;
try
{
for(int i = 0; i < 10; i++)
{
var data = new byte[ratio * i];
m_random.NextBytes(data);
using(var stream = new FileStream(file_name, FileMode.Truncate))
{
new BinaryWriter(stream).Write(data);
stream.Seek(0, SeekOrigin.Begin);
HashResult h1 = a_hash_stream.ComputeStream(stream);
HashResult h2 = a_hash.ComputeBytes(data);
Assert.AreEqual(h2, h1, String.Format("{0}, {1}", a_hash.Name, data.Length));
}
}
}
finally
{
new FileInfo(file_name).Delete();
}
}
protected void TestHashStream(IHash a_hash, int a_block_size)
{
int old = Hash.BUFFER_SIZE;
Hash.BUFFER_SIZE = a_block_size;
try
{
for (int i = 1; i < 10; i++)
{
byte[] data = new byte[13 * i];
new Random().NextBytes(data);
using (MemoryStream ms = new MemoryStream(data))
{
HashResult h1 = a_hash.ComputeBytes(data);
HashResult h2 = a_hash.ComputeStream(ms);
Assert.AreEqual(h1, h2);
h1 = a_hash.ComputeBytes(HashLib.ArrayExtensions.SubArray(data, i, i * 7));
ms.Seek(i, SeekOrigin.Begin);
h2 = a_hash.ComputeStream(ms, i * 7);
Assert.AreEqual(h1, h2);
h1 = a_hash.ComputeBytes(data);
a_hash.Initialize();
a_hash.TransformBytes(data, 0, i * 3);
ms.Seek(i * 3, SeekOrigin.Begin);
a_hash.TransformStream(ms, i * 2);
a_hash.TransformBytes(data, i * 5);
h2 = a_hash.TransformFinal();
Assert.AreEqual(h1, h2);
}
}
int[] sizes = { 1, 11, 63, 64, 65, 127, 128, 129, 255, 256, 257, 511, 512, 513,
1023, 1024, 1025, 4011, 64000, 66000, 250000, Hash.BUFFER_SIZE * 20 + 511};
foreach (int size in sizes)
{
byte[] data = new byte[size];
new Random().NextBytes(data);
using (MemoryStream ms = new MemoryStream(data))
{
HashResult h1 = a_hash.ComputeBytes(data);
HashResult h2 = a_hash.ComputeStream(ms);
Assert.AreEqual(h1, h2);
}
}
{
byte[] data = new byte[1011];
new Random().NextBytes(data);
using (MemoryStream ms = new MemoryStream(data))
{
bool ex = false;
try
{
ms.Position = 1011;
a_hash.ComputeStream(ms, -1);
}
catch
{
ex = true;
}
Assert.IsFalse(ex);
ex = false;
try
{
ms.Position = 1010;
a_hash.ComputeStream(ms, 2);
}
catch
{
ex = true;
}
Assert.IsTrue(ex);
try
{
ms.Position = 0;
a_hash.ComputeStream(ms, 1012);
}
catch
{
ex = true;
}
Assert.IsTrue(ex);
}
}
}
finally
{
Hash.BUFFER_SIZE = old;
}
}
