using System.IO;

namespace System.Security.Cryptography
{
    partial class Hashs
    {
        static SHA1 CreateSHA1()
        {
            try
            {
                return SHA1.Create();
            }
            catch
            {
                return new SHA1CryptoServiceProvider();
            }
        }

        partial class String
        {
            partial class Lengths
            {
                public const int SHA1 = 40;
            }

            /// <summary>
            /// 计算SHA1值
            /// </summary>
            /// <param name="text"></param>
            /// <param name="isLower"></param>
            /// <returns></returns>
            public static string SHA1(string text, bool isLower = def_hash_str_is_lower) => ComputeHashString(text, CreateSHA1(), isLower);

            /// <summary>
            /// 计算SHA1值
            /// </summary>
            /// <param name="buffer"></param>
            /// <param name="isLower"></param>
            /// <returns></returns>
            public static string SHA1(byte[] buffer, bool isLower = def_hash_str_is_lower) => ComputeHashString(buffer, CreateSHA1(), isLower);

            /// <summary>
            /// 计算SHA1值
            /// </summary>
            /// <param name="inputStream"></param>
            /// <param name="isLower"></param>
            /// <returns></returns>
            public static string SHA1(Stream inputStream, bool isLower = def_hash_str_is_lower) => ComputeHashString(inputStream, CreateSHA1(), isLower);
        }

        partial class ByteArray
        {
            /// <summary>
            /// 计算SHA1值
            /// </summary>
            /// <param name="buffer"></param>
            /// <returns></returns>
            public static byte[] SHA1(byte[] buffer) => ComputeHash(buffer, CreateSHA1());

            /// <summary>
            /// 计算SHA1值
            /// </summary>
            /// <param name="inputStream"></param>
            /// <returns></returns>
            public static byte[] SHA1(Stream inputStream) => ComputeHash(inputStream, CreateSHA1());
        }
    }
}