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This article mainly introducesC# Random passwords generated in batches must contain numbers and letters and be encrypted with an encryption algorithm. Friends in need can refer to the following
Requirements:
Password must contain numbers and letters
Ideas:
1. List numbers and characters . Composition String: chars
2. Use randrom.Next(int i) to return a non-negative random number that is less than the specified maximum value.
3. Randomly select a random number a that is not less than the length of chars, and select the a-th character of the string chars.
4.Loop 8 times to get the 8-digit password
5. Loop N times to get the password in batches.
The code is implemented as followsMainFunction:
static void Main(string[] args) { string chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; Random randrom = new Random((int)DateTime.Now.Ticks); string path1 = @"C:\Users\lenovo\Desktop\pws.txt"; for (int j = 0; j < 10000;j++ ) { string str = ""; for (int i = 0; i < 8; i++) { str += chars[randrom.Next(chars.Length)];//randrom.Next(int i)返回一个小于所指定最大值的非负随机数 } if (IsNumber(str))//判断是否全是数字 continue; if (IsLetter(str))//判断是否全是字母 continue; File.AppendAllText(path1, str); string pws = Md5(str,32);//MD5加密 File.AppendAllText(path1, "," + pws + "\r\n"); } Console.WriteLine("ok"); Console.Read(); }
Use the String.trim function skillfully to determine whether it is all numbers and all letters .
Description: string.trim Removes leading and trailing whitespace characters from the String object.
Returns: A copy of the string with all whitespace characters removed from the beginning and end of the string.
There is a overload: string.Trim(params char[] trimChars)
//Remove from the current System.string objectAll leading and trailing matches of a set of characters specified in array
trimChars: Array of characters to remove
The method implements the following code:
//判断是否全是数字 static bool IsNumber(string str) { if (str.Trim("0123456789".ToCharArray()) == "") return true; return false; } //判断是否全是字母 static bool IsLetter(string str) { if (str.Trim("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".ToCharArray()) == "") return true; return false; }
Use MD5 encryption, the algorithm code is implemented as follows:
/// <summary> /// MD5加密 /// </summary> /// <param name="str">加密字元</param> /// <param name="code">加密位数16/32</param> /// <returns></returns> public static string Md5(string str, int code) { string strEncrypt = string.Empty; MD5 md5 = new MD5CryptoServiceProvider(); byte[] fromData = Encoding.GetEncoding("GB2312").GetBytes(str); byte[] targetData = md5.ComputeHash(fromData); for (int i = 0; i < targetData.Length; i++) { strEncrypt += targetData[i].ToString("X2"); } if (code == 16) { strEncrypt = strEncrypt.Substring(8, 16); } return strEncrypt; }
Generate batch passwords, and the encrypted password is as shown below:
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