C# 常用加密处理
AES
using System; using System.Security.Cryptography; using System.Text; namespace Common { public class AESProvider { public static int KEYSIZE = 128; /// <summary> /// 获取随机的加密密钥 /// </summary> /// <param name="Key"></param> /// <param name="IV"></param> /// <returns></returns> public static void GenerateKey(out string Key, out string IV) { Key = GenerateKey(); IV = GenerateIV(); } /// <summary> /// 获取随机的加密密钥 /// </summary> /// <returns></returns> public static string GenerateKey() { int n = KEYSIZE / 8; char[] arrChar = new char[]{ 'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x', '0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z' }; StringBuilder num = new StringBuilder(); Random rnd = new Random(); for (int i = 0; i < n; i++) { num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString()); } return num.ToString(); } /// <summary> /// 获取随机的初始化向量 /// </summary> /// <returns></returns> public static string GenerateIV() { int n = KEYSIZE / 8; char[] arrChar = new char[]{ 'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x', '0','1','2','3','4','5','6','7','8','9', 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z' }; StringBuilder num = new StringBuilder(); Random rnd = new Random(DateTime.Now.Millisecond); for (int i = 0; i < n; i++) { num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString()); } return num.ToString(); } /// <summary> /// AES加密 /// </summary> /// <param name="TextData">待加密字符</param> /// <param name="Key">加密密钥</param> /// <param name="IV">初始化向量</param> /// <param name="CryptText">输出:已加密字符串</param> /// <returns>0:成功加密 -1:待加密字符串不为能空 -2:加密密钥不能为空 -3:初始化向量字节长度不为KEYSIZE/8 -4:其他错误</returns> public static int EncryptText(string TextData, string Key, string IV, out string CryptText) { CryptText = ""; TextData = TextData.Trim(); if (string.IsNullOrEmpty(TextData)) return -1; if (string.IsNullOrEmpty(Key)) return -2; if (string.IsNullOrEmpty(IV) || IV.Length != KEYSIZE / 8) return -3; try { RijndaelManaged rijndaelCipher = new RijndaelManaged(); rijndaelCipher.Mode = CipherMode.CBC; rijndaelCipher.Padding = PaddingMode.PKCS7; rijndaelCipher.KeySize = KEYSIZE; rijndaelCipher.BlockSize = KEYSIZE; byte[] pwdBytes = Encoding.UTF8.GetBytes(Key); byte[] ivBytes = Encoding.UTF8.GetBytes(IV); byte[] keyBytes = new byte[KEYSIZE / 8]; int len = pwdBytes.Length; if (len > keyBytes.Length) len = keyBytes.Length; System.Array.Copy(pwdBytes, keyBytes, len); rijndaelCipher.Key = keyBytes; rijndaelCipher.IV = ivBytes; ICryptoTransform transform = rijndaelCipher.CreateEncryptor(); byte[] plainText = Encoding.UTF8.GetBytes(TextData); byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length); CryptText = Convert.ToBase64String(cipherBytes); return 0; } catch { return -4; } } /// <summary> /// AES解密 /// </summary> /// <param name="CryptText">待解密字符串</param> /// <param name="Key">加密密钥</param> /// <param name="IV">初始化向量</param> /// <param name="TextData">输出:已解密的字符串</param> /// <returns>0:成功解密 -1:待解密字符串不为能空 -2:加密密钥不能为空 -3:初始化向量字节长度不为KEYSIZE/8 -4:其他错误</returns> public static int DecryptText(string CryptText, string Key, string IV, out string TextData) { TextData = ""; if (string.IsNullOrEmpty(CryptText)) return -1; if (string.IsNullOrEmpty(Key)) return -2; if (string.IsNullOrEmpty(IV) || IV.Length != KEYSIZE / 8) return -3; try { RijndaelManaged rijndaelCipher = new RijndaelManaged(); rijndaelCipher.Mode = CipherMode.CBC; rijndaelCipher.Padding = PaddingMode.PKCS7; rijndaelCipher.KeySize = KEYSIZE; rijndaelCipher.BlockSize = KEYSIZE; byte[] encryptedData = Convert.FromBase64String(CryptText); byte[] pwdBytes = Encoding.UTF8.GetBytes(Key); byte[] ivBytes = Encoding.UTF8.GetBytes(IV); byte[] keyBytes = new byte[KEYSIZE / 8]; int len = pwdBytes.Length; if (len > keyBytes.Length) len = keyBytes.Length; System.Array.Copy(pwdBytes, keyBytes, len); rijndaelCipher.Key = keyBytes; rijndaelCipher.IV = ivBytes; ICryptoTransform transform = rijndaelCipher.CreateDecryptor(); byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length); TextData = Encoding.UTF8.GetString(plainText).Trim(); return 0; } catch { return -4; } } } }
RSA
using System; using System.Security.Cryptography; using System.Text; namespace Common { public class RSAProvider { public static int KEYSIZE = 1024; /// <summary> /// 自动生成公私密钥 /// </summary> /// <param name="Modulus">输出:加密公钥</param> /// <param name="Exponent">输入:公钥指数</param> /// <param name="PrivateKey">输出:私钥</param> public static void GenerateKey(out string Modulus, out string Exponent, out string PrivateKey) { RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(KEYSIZE); RSAParameters pubparam = rsaProvider.ExportParameters(false); byte[] mod = pubparam.Modulus; byte[] exp = pubparam.Exponent; byte[] prikey = rsaProvider.ExportCspBlob(true); Modulus = Convert.ToBase64String(mod); Exponent = Convert.ToBase64String(exp); PrivateKey = Convert.ToBase64String(prikey); } /// <summary> /// RSA加密 /// </summary> /// <param name="TextData">待加密字符</param> /// <param name="Modulus">加密公钥</param> /// <param name="Exponent">加密指数</param> /// <param name="CryptText">输出:已加密字符串</param> /// <returns>0:成功加密 -1:待加密字符串不为能空 -2:加密公钥不能为空 -3:待加密字符串超长 -4:其他错误</returns> public static int EncryptText(string TextData, string Modulus, string Exponent, out string CryptText) { CryptText = ""; if (string.IsNullOrEmpty(TextData)) return -1; if (string.IsNullOrEmpty(Modulus)) return -2; if (TextData.Length > KEYSIZE / 8 - 11) return -3; try { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(KEYSIZE); byte[] modBytes = Convert.FromBase64String(Modulus); byte[] expBytes = Convert.FromBase64String(Exponent); RSAParameters p = new RSAParameters(); p.Modulus = modBytes; p.Exponent = expBytes; rsa.ImportParameters(p); byte[] plainText = Encoding.UTF8.GetBytes(TextData); byte[] cipherBytes = rsa.Encrypt(plainText, false); CryptText = Convert.ToBase64String(cipherBytes); return 0; } catch { return -4; } } /// <summary> /// RSA解密 /// </summary> /// <param name="CryptText">待解密字符串</param> /// <param name="Key">解密私钥</param> /// <param name="TextData">输出:已解密的字符串</param> /// <returns>0:成功解密 -1:待解密字符串不为能空 -2:解密私钥不能为空 -4:其他错误</returns> public static int DecryptText(string CryptText, string PrivateKey, out string TextData) { TextData = ""; if (string.IsNullOrEmpty(CryptText)) return -1; if (string.IsNullOrEmpty(PrivateKey)) return -2; try { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(KEYSIZE); byte[] prikey = Convert.FromBase64String(PrivateKey); ; rsa.ImportCspBlob(prikey); byte[] cipherBytes = Convert.FromBase64String(CryptText); byte[] plainText = rsa.Decrypt(cipherBytes, false); TextData = Encoding.UTF8.GetString(plainText); return 0; } catch { return -4; } } } }
MD5
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Common { public class EncryptMD5 { public static string GetMd5(string s, Encoding encoding) { System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();//实例化一个MD5 byte[] t = md5.ComputeHash(encoding.GetBytes(s));//生成MD5哈希值 StringBuilder sb = new StringBuilder(); for (int i = 0; i < t.Length; i++) { sb.Append(t[i].ToString("x").PadLeft(2, '0'));//将哈希值转换为字符串 } return sb.ToString().ToUpper(); } } }
