Woohoo.Security.Cryptography

Library of hash algorithms and utilities for .NET.

CRC32

To use the CRC32 hash algorithm, you can create an instance of the CRC32 class and call the ComputeHash method with your data.

using Woohoo.Security.Cryptography;

HashAlgorithm algorithm = CRC32.Create();

byte[] data = [1, 2, 3, 4, 5];
byte[] hash = algorithm.ComputeHash(data);

Hash Algorithm Factory

To create an instance of a hash algorithm by case-insensitive name, you can use the HashAlgorithmFactory class.

The following hash algorithms are supported: crc32, md5, sha1, sha256, sha384, sha512.

using Woohoo.Security.Cryptography;

HashAlgorithm crc32 = HashAlgorithmFactory.Create("crc32");
HashAlgorithm md5 = HashAlgorithmFactory.Create("md5");
HashAlgorithm sha1 = HashAlgorithmFactory.Create("sha1");

Hash Calculator

To compute multiple hash algorithms in one call, you can use the Calculate method on the HashCalculator class.

The hashes will be computed in parallel, and the results will be returned in a HashCalculatorResult object.

There are overloads to pass in either a stream or a file path.

using Woohoo.Security.Cryptography;

string path = "path/to/your/file.txt";

HashCalculatorResult result = new HashCalculator().Calculate(["CRC32", "MD5", "SHA1"], path);
byte[] crc32Hash = result.Checksums["CRC32"];
byte[] md5Hash = result.Checksums["MD5"];
byte[] sha1Hash = result.Checksums["SHA1"];

To be notified of progress, subscribe to the Progress event before calling Calculate.

using Woohoo.Security.Cryptography;

void ProgressHandler(object? sender, HashCalculatorProgressEventArgs ea)
{
    Console.WriteLine($"{ea.FilePath}: {ea.ProgressPercentage} percent done. {ea.ProgressBytes} of {ea.Length} bytes.");
}

string path = "path/to/your/file.txt";

HashCalculator calc = new HashCalculator();
calc.Progress += ProgressHandler;
calc.Calculate(["CRC32", "MD5", "SHA1"], path);

To abort a calculation, you can call the Cancel method on the HashCalculator instance.

To convert the byte array to a hexadecimal string, you can use the static HexToString method.

using Woohoo.Security.Cryptography;

string crc32Hex = HashCalculator.HexToString(crc32Hash);

XOR Transform

To encrypt/decrypt a byte array using a key, you can use the XorTransform class, which implements the System.Security.Cryptography.ICryptoTransform interface.

using Woohoo.Security.Cryptography;

byte[] key = [0x41, 0x76, 0x69, 0x73, 0x20, 0x44, 0x75, 0x72, 0x67, 0x61, 0x6e];
byte[] data = [0x00, 0x00, 0x05, 0x01, 0x02, 0x03, 0x01, 0x02, 0x03, 0x05, 0x00, 0x00];

using (var transform = new XorTransform(key))
{
    byte[] xor = transform.TransformFinalBlock(data, 0, data.Length);
}