RSADemo2

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ERN.Tools.Common
{
/// <summary>
/// 封装的一些通用方法
/// </summary>
public class RSA_Unit
{
static public string Base64EncodeBytes(byte[] byts)
{
return Convert.ToBase64String(byts);
}
static public byte[] Base64DecodeBytes(string str)
{
try
{
return Convert.FromBase64String(str);
}
catch
{
return null;
}
}
/// <summary>
/// 把字符串按每行多少个字断行
/// </summary>
static public string TextBreak(string text, int line)
{
var idx = 0;
var len = text.Length;
var str = new StringBuilder();
while (idx < len)
{
if (idx > 0)
{
str.Append('\n');
}
if (idx + line >= len)
{
str.Append(text.Substring(idx));
}
else
{
str.Append(text.Substring(idx, line));
}
idx += line;
}
return str.ToString();
}
}

static public class Extensions
{
/// <summary>
/// 从数组start开始到指定长度复制一份
/// </summary>
static public T[] sub<T>(this T[] arr, int start, int count)
{
T[] val = new T[count];
for (var i = 0; i < count; i++)
{
val[i] = arr[start + i];
}
return val;
}
static public void writeAll(this Stream stream, byte[] byts)
{
stream.Write(byts, 0, byts.Length);
}
}
}