/// <summary>
/// Compares the hash of the given streams using the specified hashing algo
/// </summary>
/// <param name="stream1">First stream</param>
/// <param name="stream2">Second stream</param>
/// <param name="algo">Hashing algo to use</param>
/// <returns>True if the hashes are equal</returns>
static bool CompareHash(Stream stream1, Stream stream2, HashingAlgos algo = HashingAlgos.MD5)
{
var hash1 = ComputeHash(stream1, algo);
var hash2 = ComputeHash(stream2, algo);
return(IsEqual(hash1, hash2));
}
/// <summary>
/// Computes the hash from the given byte array
/// </summary>
/// <param name="bytes">Array whose hash is to be computed</param>
/// <param name="algo">Hashing algo to use</param>
/// <returns></returns>
static byte[] ComputeHash(byte[] bytes, HashingAlgos algo = HashingAlgos.MD5)
{
switch (algo)
{
case HashingAlgos.MD5:
return(MD5.Create().ComputeHash(bytes));
case HashingAlgos.SHA256:
return(SHA256.Create().ComputeHash(bytes));
case HashingAlgos.SHA512:
return(SHA512.Create().ComputeHash(bytes));
default:
throw null;
}
}
/// <summary>
/// Compares the given hash and the hash computed from the given stream using the specified hashing algo
/// </summary>
/// <param name="hash">Hash against which the stream's computed hash is to be compared</param>
/// <param name="stream">Stream whose computed hash is to be compared</param>
/// <param name="algo">Hashing algo to use</param>
/// <returns>True if the hashes are equal</returns>
static bool CompareHash(byte[] hash, Stream stream, HashingAlgos algo = HashingAlgos.MD5)
{
var computedHash = ComputeHash(stream, algo);
return(IsEqual(hash, computedHash));
}
/// <summary>
/// Computes the hash of the given text
/// </summary>
/// <param name="text">Text whose hash is to be computed</param>
/// <param name="algo">Hashing algo to use</param>
/// <returns>The computed hash</returns>
static byte[] ComputeHash(string text, HashingAlgos algo = HashingAlgos.MD5)
{
var bytes = Encoding.UTF8.GetBytes(text);
return(ComputeHash(bytes, algo));
}
