public HashFunction()

in UProveCrypto/HashFunction.cs [43:80]

• 37 lines of code
• 11 McCabe index (conditional complexity)

        public HashFunction(String hashAlgorithm)
        {
            if (hashAlgorithm == null)
            {
                throw new ArgumentNullException("hashAlgorithm");
            }

#if NETFX_CORE
            hash = HashAlgorithmProvider.OpenAlgorithm(hashAlgorithm.Replace("-", "")).CreateHash();
#else // NETFX_CORE
#if SILVERLIGHT
            if (hashAlgorithm.Equals("SHA", StringComparison.OrdinalIgnoreCase) ||
                hashAlgorithm.Equals("SHA1", StringComparison.OrdinalIgnoreCase) ||
                hashAlgorithm.Equals("System.Security.Cryptography.SHA1", StringComparison.OrdinalIgnoreCase) ||
                hashAlgorithm.Equals("http://www.w3.org/2000/09/xmldsig#sha1", StringComparison.OrdinalIgnoreCase))
            {
                hash = new SHA1Managed();
            }
            else if (hashAlgorithm.Equals("SHA256", StringComparison.OrdinalIgnoreCase) ||
                hashAlgorithm.Equals("SHA-256", StringComparison.OrdinalIgnoreCase) ||
                hashAlgorithm.Equals("System.Security.Cryptography.SHA256", StringComparison.OrdinalIgnoreCase) ||
                hashAlgorithm.Equals("http://www.w3.org/2001/04/xmlenc#sha256", StringComparison.OrdinalIgnoreCase))
            {
                hash = new SHA256Managed();
            }
            else 
            {
                hash = null;
            }
#else
            hash = HashAlgorithm.Create(hashAlgorithm);
#endif // SILVERLIGHT
#endif // NETFX_CORE
            if (hash == null)
            {
                throw new ArgumentException("Unsupported hash algorithm: " + hashAlgorithm);
            }
        }