private System.Security.Cryptography.HashAlgorithm GetHashAlgorithm(HashAlgorithm.Algorithms algorithm)
{
System.Security.Cryptography.HashAlgorithm hashAlgorithm;
switch (algorithm)
{
case HashAlgorithm.Algorithms.CRC32:
hashAlgorithm = new CRC32();
break;
case HashAlgorithm.Algorithms.MD5:
hashAlgorithm = MD5.Create();
break;
case HashAlgorithm.Algorithms.SHA1:
hashAlgorithm = SHA1.Create();
break;
case HashAlgorithm.Algorithms.SHA256:
hashAlgorithm = SHA256.Create();
break;
case HashAlgorithm.Algorithms.SHA512:
hashAlgorithm = SHA512.Create();
break;
default:
throw new ArgumentOutOfRangeException(nameof(algorithm), algorithm, null);
}
return(hashAlgorithm);
}
/// <summary>
/// Gets checksum of filename (if it includeFilename is true) and file contents
/// </summary>
/// <param name="algorithm">Hash algorithm to use (this is not the same as System.Security.Cryptography.HashAlgorithm)</param>
/// <param name="includeFilename">If true, includes filename when calculating hash</param>
public void GetChecksum(HashAlgorithm.Algorithms algorithm, bool includeFilename = false)
{
var hashAlgorithm = GetHashAlgorithm(algorithm);
var checksum = CalculateHash(includeFilename, hashAlgorithm);
if (!string.IsNullOrEmpty(checksum))
{
Checksum = checksum;
}
}
