private HashAlgorithm GetHashAlgorithm()
{
HashAlgorithm algorithm = null;
try
{
Type type = Type.GetType(algorithmType);
algorithm = Activator.CreateInstance(type, true) as HashAlgorithm;
KeyedHashAlgorithm keyedHashAlgorithm = algorithm as KeyedHashAlgorithm;
if ((null != keyedHashAlgorithm) && (key != null))
{
keyedHashAlgorithm.Key = key;
}
}
catch (Exception ex)
{
CryptographyUtility.LogCryptographyException(ex);
throw new CryptographicException(SR.ExceptionCreatingHashAlgorithmInstance);
}
if (algorithm == null)
{
throw new CryptographicException(SR.ExceptionCastingHashAlgorithmInstance);
}
return(algorithm);
}
private static SymmetricAlgorithm GetSymmetricAlgorithm(string algorithmType)
{
SymmetricAlgorithm sa = null;
try
{
Type type = Type.GetType(algorithmType, true);
sa = Activator.CreateInstance(type) as SymmetricAlgorithm;
}
catch (Exception ex)
{
// We want to supress any type of exception here for security reasons.
CryptographyUtility.LogCryptographyException(ex);
throw new CryptographicException(SR.ExceptionCreatingSymmetricAlgorithmInstance);
}
if (sa == null)
{
throw new CryptographicException(SR.ExceptionCastingSymmetricAlgorithmInstance);
}
return(sa);
}