C # generate random passwords in batches, which must contain numbers and letters and be encrypted using encryption algorithms,

C # generate random passwords in batches, which must contain numbers and letters and be encrypted using encryption algorithms,

Required: the password must contain numbers and letters.

Idea: 1. List numbers and characters. Composition string: chars

2. Use randrom. Next (int I) to return a non-negative random number smaller than the specified maximum value.

3. Random Number a, which is not less than the chars length, and the character a of the character string chars.

4. Loop 8 times to get the 8-bit password

5. Loop N times to obtain passwords in batches.

The Code implements the following Main function:

Static void Main (string [] args) {string chars = "0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 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) returns a non-negative random number that is less than the specified maximum value} if (IsNumber (str) // determines whether all are numerical continue; if (IsLetter (str )) // determine whether all are letters continue; File. appendAllText (path1, str); string pws = Md5 (str, 32); // MD5 encrypted File. appendAllText (path1, "," + pws + "\ r \ n");} Console. writeLine ("OK"); Console. read ();}

 

Use the String. trim function to determine whether all numbers are full of letters.

Description: string. trim slaveStringRemoves leading and trailing white spaces from the object.

Return: a copy of the string. All white spaces are removed from the beginning and end of the string.

There is an overload:String. Trim (params char [] trimChars)

// Remove all leading and trailing matches of the specified group of characters from the current System. string object

TrimChars: array of characters to be deleted

The following code is implemented:

// Determine whether all the numbers are static bool IsNumber (string str) {if (str. trim ("0123456789 ". toCharArray () = "") return true; return false;} // determines whether all the letters are 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 encryption /// </summary> /// <param name = "str"> encrypted character </param> /// <param name = "code"> 16/32 bits </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 a batch password and an encrypted password, for example: