Yi.Framework.Net6/Yi.Framework.Common/Helper/Base32Helper.cs

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using System;
using System.Text;

namespace Yi.Framework.Common.Helper
{
    public sealed class Base32Helper
    {

        // the valid chars for the encoding
        private static string ValidChars = "QAZ2WSX3" + "EDC4RFV5" + "TGB6YHN7" + "UJM8K9LP";

        /// <summary>
        /// Converts an array of bytes to a Base32-k string.
        /// </summary>
        public static string ToString(byte[] bytes)
        {
            StringBuilder sb = new StringBuilder();         // holds the base32 chars
            byte index;
            int hi = 5;
            int currentByte = 0;

            while (currentByte < bytes.Length)
            {
                // do we need to use the next byte?
                if (hi > 8)
                {
                    // get the last piece from the current byte, shift it to the right
                    // and increment the byte counter
                    index = (byte)(bytes[currentByte++] >> (hi - 5));
                    if (currentByte != bytes.Length)
                    {
                        // if we are not at the end, get the first piece from
                        // the next byte, clear it and shift it to the left
                        index = (byte)(((byte)(bytes[currentByte] << (16 - hi)) >> 3) | index);
                    }

                    hi -= 3;
                }
                else if (hi == 8)
                {
                    index = (byte)(bytes[currentByte++] >> 3);
                    hi -= 3;
                }
                else
                {

                    // simply get the stuff from the current byte
                    index = (byte)((byte)(bytes[currentByte] << (8 - hi)) >> 3);
                    hi += 5;
                }

                sb.Append(ValidChars[index]);
            }

            return sb.ToString();
        }


        /// <summary>
        /// Converts a Base32-k string into an array of bytes.