DocSpace-client/common/ASC.Common/Security/Cryptography/Hasher.cs

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 *
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namespace ASC.Security.Cryptography
{
    public static class Hasher
    {
        private const HashAlg DefaultAlg = HashAlg.SHA256;


        public static byte[] Hash(string data, HashAlg hashAlg)
        {
            return ComputeHash(data, hashAlg);
        }

        public static byte[] Hash(string data)
        {
            return Hash(data, DefaultAlg);
        }

        public static byte[] Hash(byte[] data, HashAlg hashAlg)
        {
            return ComputeHash(data, hashAlg);
        }

        public static byte[] Hash(byte[] data)
        {
            return Hash(data, DefaultAlg);
        }

        public static string Base64Hash(string data, HashAlg hashAlg)
        {
            return ComputeHash64(data, hashAlg);
        }

        public static string Base64Hash(string data)
        {
            return Base64Hash(data, DefaultAlg);
        }

        public static string Base64Hash(byte[] data, HashAlg hashAlg)
        {
            return ComputeHash64(data, hashAlg);
        }

        public static string Base64Hash(byte[] data)
        {
            return Base64Hash(data, DefaultAlg);
        }

        public static bool EqualHash(byte[] dataToCompare, byte[] hash, HashAlg hashAlg)
        {
            return string.Equals(
                ComputeHash64(dataToCompare, hashAlg),
                B2S64(hash)
                );
        }

        public static bool EqualHash(byte[] dataToCompare, byte[] hash)
        {
            return EqualHash(dataToCompare, hash, DefaultAlg);
        }

        public static bool EqualHash(string dataToCompare, string hash, HashAlg hashAlg)
        {
            return EqualHash(S2B(dataToCompare), S642B(hash), hashAlg);
        }

        public static bool EqualHash(string dataToCompare, string hash)
        {
            return EqualHash(dataToCompare, hash, DefaultAlg);
        }


        private static HashAlgorithm GetAlg(HashAlg hashAlg)
        {
            return hashAlg switch
            {
                HashAlg.MD5 => MD5.Create(),
                HashAlg.SHA1 => SHA1.Create(),
                HashAlg.SHA256 => SHA256.Create(),
                HashAlg.SHA512 => SHA512.Create(),
                _ => SHA256.Create()
            };
        }

        private static byte[] S2B(string str)
        {
            if (str == null) throw new ArgumentNullException(nameof(str));
            return Encoding.UTF8.GetBytes(str);
        }

        private static string B2S(byte[] data)
        {
            if (data == null) throw new ArgumentNullException(nameof(data));
            return Encoding.UTF8.GetString(data);
        }

        private static byte[] S642B(string str)
        {
            if (str == null) throw new ArgumentNullException(nameof(str));
            return Convert.FromBase64String(str);
        }

        private static string B2S64(byte[] data)
        {
            if (data == null) throw new ArgumentNullException(nameof(data));
            return Convert.ToBase64String(data);
        }

        private static byte[] ComputeHash(byte[] data, HashAlg hashAlg)
        {
            using var alg = GetAlg(hashAlg);
            return alg.ComputeHash(data);
        }

        private static byte[] ComputeHash(string data, HashAlg hashAlg)
        {
            return ComputeHash(S2B(data), hashAlg);
        }

        private static string ComputeHash64(byte[] data, HashAlg hashAlg)
        {
            return B2S64(ComputeHash(data, hashAlg));
        }

        private static string ComputeHash64(string data, HashAlg hashAlg)
        {
            return ComputeHash64(S2B(data), hashAlg);
        }
    }
}