■ RNGCryptoServiceProvider 클래스의 GetBytes 메소드를 사용해 임시 패스워드를 생성하는 방법을 보여준다.
▶ TemporaryPasswordHelper.cs
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using System; using System.Security.Cryptography; namespace TestProject { /// <summary> /// 임시 패스워드 헬퍼 /// </summary> public class TemporaryPasswordHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 디폴트 최소 패스워드 길이 /// </summary> private static int DEFAULT_MINIMUM_PASSWORD_LENGTH = 8; /// <summary> /// 디폴트 최대 패스워드 길이 /// </summary> private static int DEFAULT_MAXIMUM_PASSWORD_LENGTH = 10; /// <summary> /// 소문자 문자 리스트 /// </summary> private static string LOWER_CASE_CHARACTER_LIST = "abcdefgijkmnopqrstwxyz"; /// <summary> /// 대문자 문자 리스트 /// </summary> private static string UPPER_CASE_CHARACTER_LIST = "ABCDEFGHJKLMNPQRSTWXYZ"; /// <summary> /// 숫자 문자 리스트 /// </summary> private static string NUMERIC_CHARACTER_LIST = "23456789"; /// <summary> /// 특수 문자 리스트 /// </summary> private static string SPECIAL_CHARACTER_LIST = "*$-+?_&=!%{}/"; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 생성하기 - Generate(minimumLength, maximumLength) /// <summary> /// 생성하기 /// </summary> /// <param name="minimumLength">최소 길이</param> /// <param name="maximumLength">최대 길이</param> /// <returns>임시 패스워드</returns> public static string Generate(int minimumLength, int maximumLength) { if(minimumLength <= 0 || maximumLength <= 0 || minimumLength > maximumLength) { return null; } char[][] characterArrayArray = new char[][] { LOWER_CASE_CHARACTER_LIST.ToCharArray(), UPPER_CASE_CHARACTER_LIST.ToCharArray(), NUMERIC_CHARACTER_LIST.ToCharArray(), SPECIAL_CHARACTER_LIST.ToCharArray() }; int[] characterArrayLeftInGroup = new int[characterArrayArray.Length]; for(int i = 0; i < characterArrayLeftInGroup.Length; i++) { characterArrayLeftInGroup[i] = characterArrayArray[i].Length; } int[] leftGroupOrderArray = new int[characterArrayArray.Length]; for(int i = 0; i < leftGroupOrderArray.Length; i++) { leftGroupOrderArray[i] = i; } byte[] randomByteArray = new byte[4]; RNGCryptoServiceProvider provider = new RNGCryptoServiceProvider(); provider.GetBytes(randomByteArray); int seed = BitConverter.ToInt32(randomByteArray, 0); Random random = new Random(seed); char[] passwordCharacterArray = null; if(minimumLength < maximumLength) { passwordCharacterArray = new char[random.Next(minimumLength, maximumLength + 1)]; } else { passwordCharacterArray = new char[minimumLength]; } int nextCharacterIndex; int nextGroupIndex; int nextLeftGroupOrderIndex; int lastCharacterIndex; int lastLeftGroupOrderIndex = leftGroupOrderArray.Length - 1; for(int i = 0; i < passwordCharacterArray.Length; i++) { if(lastLeftGroupOrderIndex == 0) { nextLeftGroupOrderIndex = 0; } else { nextLeftGroupOrderIndex = random.Next(0, lastLeftGroupOrderIndex); } nextGroupIndex = leftGroupOrderArray[nextLeftGroupOrderIndex]; lastCharacterIndex = characterArrayLeftInGroup[nextGroupIndex] - 1; if(lastCharacterIndex == 0) { nextCharacterIndex = 0; } else { nextCharacterIndex = random.Next(0, lastCharacterIndex + 1); } passwordCharacterArray[i] = characterArrayArray[nextGroupIndex][nextCharacterIndex]; if(lastCharacterIndex == 0) { characterArrayLeftInGroup[nextGroupIndex] = characterArrayArray[nextGroupIndex].Length; } else { if(lastCharacterIndex != nextCharacterIndex) { char temporaryCharacter = characterArrayArray[nextGroupIndex][lastCharacterIndex]; characterArrayArray[nextGroupIndex][lastCharacterIndex] = characterArrayArray[nextGroupIndex][nextCharacterIndex]; characterArrayArray[nextGroupIndex][nextCharacterIndex] = temporaryCharacter; } characterArrayLeftInGroup[nextGroupIndex]--; } if(lastLeftGroupOrderIndex == 0) { lastLeftGroupOrderIndex = leftGroupOrderArray.Length - 1; } else { if(lastLeftGroupOrderIndex != nextLeftGroupOrderIndex) { int temporaryValue = leftGroupOrderArray[lastLeftGroupOrderIndex]; leftGroupOrderArray[lastLeftGroupOrderIndex] = leftGroupOrderArray[nextLeftGroupOrderIndex]; leftGroupOrderArray[nextLeftGroupOrderIndex] = temporaryValue; } lastLeftGroupOrderIndex--; } } return new string(passwordCharacterArray); } #endregion #region 생성하기 - Generate() /// <summary> /// 생성하기 /// </summary> /// <returns>임시 패스워드</returns> public static string Generate() { return Generate(DEFAULT_MINIMUM_PASSWORD_LENGTH, DEFAULT_MAXIMUM_PASSWORD_LENGTH); } #endregion #region 생성하기 - Generate(length) /// <summary> /// 생성하기 /// </summary> /// <param name="length">길이</param> /// <returns>임시 패스워드</returns> public static string Generate(int length) { return Generate(length, length); } #endregion } } |
▶ Program.cs
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using System; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { Console.WriteLine(TemporaryPasswordHelper.Generate(10, 15)); } #endregion } } |
