如何在c#中加密和解密字符串?


当前回答

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.IO;
using System.Text;  

/// <summary>
/// Summary description for Encryption
/// </summary>
public class Encryption
{
    public TripleDES CreateDES(string key)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        TripleDES des = new TripleDESCryptoServiceProvider();
        des.Key = md5.ComputeHash(Encoding.Unicode.GetBytes(key));
        des.IV = new byte[des.BlockSize / 8];
        return des;
    }
    public  byte[] Encryptiondata(string PlainText)
    {
        TripleDES des = CreateDES("DreamMLMKey");
        ICryptoTransform ct = des.CreateEncryptor();
        byte[] input = Encoding.Unicode.GetBytes(PlainText);
        return ct.TransformFinalBlock(input, 0, input.Length);
    }

    public string Decryptiondata(string CypherText)
    {
        string stringToDecrypt = CypherText.Replace(" ", "+");
        int len = stringToDecrypt.Length;
        byte[] inputByteArray = Convert.FromBase64String(stringToDecrypt); 

        byte[] b = Convert.FromBase64String(CypherText);
        TripleDES des = CreateDES("DreamMLMKey");
        ICryptoTransform ct = des.CreateDecryptor();
        byte[] output = ct.TransformFinalBlock(b, 0, b.Length);
        return Encoding.Unicode.GetString(output);
    }
    public string Decryptiondataurl(string CypherText)
    {
        string newcyperttext=CypherText.Replace(' ', '+');
        byte[] b = Convert.FromBase64String(newcyperttext);
        TripleDES des = CreateDES("DreamMLMKey");
        ICryptoTransform ct = des.CreateDecryptor();
        byte[] output = ct.TransformFinalBlock(b, 0, b.Length);
        return Encoding.Unicode.GetString(output);
    }


    #region  encryption & Decription
    public  string Encrypt(string input, string key)
    {
        byte[] inputArray = UTF8Encoding.UTF8.GetBytes(input);
        TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
        tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
        tripleDES.Mode = CipherMode.ECB;
        tripleDES.Padding = PaddingMode.PKCS7;
        ICryptoTransform cTransform = tripleDES.CreateEncryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
        tripleDES.Clear();
        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }
    public  string Decrypt(string input, string key)
    {
        byte[] inputArray = Convert.FromBase64String(input);
        TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
        tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
        tripleDES.Mode = CipherMode.ECB;
        tripleDES.Padding = PaddingMode.PKCS7;
        ICryptoTransform cTransform = tripleDES.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
        tripleDES.Clear();
        return UTF8Encoding.UTF8.GetString(resultArray);
    }

    public string encrypt(string encryptString)
    {
        string EncryptionKey = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        byte[] clearBytes = Encoding.Unicode.GetBytes(encryptString);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
                0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
            });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(clearBytes, 0, clearBytes.Length);
                    cs.Close();
                }
                encryptString = Convert.ToBase64String(ms.ToArray());
            }
        }
        return encryptString;
    }

    public string Decrypt(string cipherText)
    {
        string EncryptionKey = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        cipherText = cipherText.Replace(" ", "+");
        byte[] cipherBytes = Convert.FromBase64String(cipherText);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
                0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
            });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(cipherBytes, 0, cipherBytes.Length);
                    cs.Close();
                }
                cipherText = Encoding.Unicode.GetString(ms.ToArray());
            }
        }
        return cipherText;
    }

    #endregion
}

其他回答

我想给你我的贡献,与我的代码AES Rfc2898DeriveBytes(这里的文档)算法,写在c#(。NET框架4),并且完全适用于有限的平台,如Windows Phone 7.0+的.NET紧凑框架(不是所有平台都支持.NET框架的每一种编码方法!)

我希望这能帮助到任何人!

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

public static class Crypto
{
    private static readonly byte[] IVa = new byte[] { 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x11, 0x11, 0x12, 0x13, 0x14, 0x0e, 0x16, 0x17 };


    public static string Encrypt(this string text, string salt)
    {
        try
        {
            using (Aes aes = new AesManaged())
            {
                Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes(Encoding.UTF8.GetString(IVa, 0, IVa.Length), Encoding.UTF8.GetBytes(salt));
                aes.Key = deriveBytes.GetBytes(128 / 8);
                aes.IV = aes.Key;
                using (MemoryStream encryptionStream = new MemoryStream())
                {
                    using (CryptoStream encrypt = new CryptoStream(encryptionStream, aes.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        byte[] cleanText = Encoding.UTF8.GetBytes(text);
                        encrypt.Write(cleanText, 0, cleanText.Length);
                        encrypt.FlushFinalBlock();
                    }

                    byte[] encryptedData = encryptionStream.ToArray();
                    string encryptedText = Convert.ToBase64String(encryptedData);


                    return encryptedText;
                }
            }
        }
        catch
        {
            return String.Empty;
        }
    }

    public static string Decrypt(this string text, string salt)
    {
        try
        {
            using (Aes aes = new AesManaged())
            {
                Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes(Encoding.UTF8.GetString(IVa, 0, IVa.Length), Encoding.UTF8.GetBytes(salt));
                aes.Key = deriveBytes.GetBytes(128 / 8);
                aes.IV = aes.Key;

                using (MemoryStream decryptionStream = new MemoryStream())
                {
                    using (CryptoStream decrypt = new CryptoStream(decryptionStream, aes.CreateDecryptor(), CryptoStreamMode.Write))
                    {
                        byte[] encryptedData = Convert.FromBase64String(text);


                        decrypt.Write(encryptedData, 0, encryptedData.Length);
                        decrypt.Flush();
                    }

                    byte[] decryptedData = decryptionStream.ToArray();
                    string decryptedText = Encoding.UTF8.GetString(decryptedData, 0, decryptedData.Length);


                    return decryptedText;
                }
            }
        }
        catch
        {
            return String.Empty;
        }
        }
    }
}

为了简单起见,我为自己做了这个函数,用于非加密目的:用你的密码替换“yourpassphrase”…

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;

 namespace My
{
    public class strCrypto
    {
        // This constant string is used as a "salt" value for the PasswordDeriveBytes function calls.
    // This size of the IV (in bytes) must = (keysize / 8).  Default keysize is 256, so the IV must be
    // 32 bytes long.  Using a 16 character string here gives us 32 bytes when converted to a byte array.
    private const string initVector = "r5dm5fgm24mfhfku";
    private const string passPhrase = "yourpassphrase"; // email password encryption password

    // This constant is used to determine the keysize of the encryption algorithm.
    private const int keysize = 256;

    public static string encryptString(string plainText)
    {
        //if the plaintext  is empty or null string just return an empty string
        if (plainText == "" || plainText == null )
        {
            return "";
        }

        byte[] initVectorBytes = Encoding.UTF8.GetBytes(initVector);
        byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
        PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
        byte[] keyBytes = password.GetBytes(keysize / 8);
        RijndaelManaged symmetricKey = new RijndaelManaged();
        symmetricKey.Mode = CipherMode.CBC;
        ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
        cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
        cryptoStream.FlushFinalBlock();
        byte[] cipherTextBytes = memoryStream.ToArray();
        memoryStream.Close();
        cryptoStream.Close();
        return Convert.ToBase64String(cipherTextBytes);
    }

    public static string decryptString(string cipherText)
    {
        //if the ciphertext is empty or null string just return an empty string
        if (cipherText == "" || cipherText == null )
        {
            return "";
        }

        byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
        byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
        PasswordDeriveBytes password = new PasswordDeriveBytes(passPhrase, null);
        byte[] keyBytes = password.GetBytes(keysize / 8);
        RijndaelManaged symmetricKey = new RijndaelManaged();
        symmetricKey.Mode = CipherMode.CBC;
        ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);
        MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
        CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);
        byte[] plainTextBytes = new byte[cipherTextBytes.Length];
        int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
        memoryStream.Close();
        cryptoStream.Close();
        return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
    }


}

}

加密

public string EncryptString(string inputString)
{
    MemoryStream memStream = null;
    try
    {
        byte[] key = { };
        byte[] IV = { 12, 21, 43, 17, 57, 35, 67, 27 };
        string encryptKey = "aXb2uy4z"; // MUST be 8 characters
        key = Encoding.UTF8.GetBytes(encryptKey);
        byte[] byteInput = Encoding.UTF8.GetBytes(inputString);
        DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
        memStream = new MemoryStream();
        ICryptoTransform transform = provider.CreateEncryptor(key, IV);
        CryptoStream cryptoStream = new CryptoStream(memStream, transform, CryptoStreamMode.Write);
        cryptoStream.Write(byteInput, 0, byteInput.Length);
        cryptoStream.FlushFinalBlock();
    }
    catch (Exception ex)
    {
        Response.Write(ex.Message);
    }
    return Convert.ToBase64String(memStream.ToArray());
}

解密:

public string DecryptString(string inputString)
{
    MemoryStream memStream = null;
    try
    {
        byte[] key = { };
        byte[] IV = { 12, 21, 43, 17, 57, 35, 67, 27 };
        string encryptKey = "aXb2uy4z"; // MUST be 8 characters
        key = Encoding.UTF8.GetBytes(encryptKey);
        byte[] byteInput = new byte[inputString.Length];
        byteInput = Convert.FromBase64String(inputString);
        DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
        memStream = new MemoryStream();
        ICryptoTransform transform = provider.CreateDecryptor(key, IV);
        CryptoStream cryptoStream = new CryptoStream(memStream, transform, CryptoStreamMode.Write);
        cryptoStream.Write(byteInput, 0, byteInput.Length);
        cryptoStream.FlushFinalBlock();
    }
    catch (Exception ex)
    {
        Response.Write(ex.Message);
    }

    Encoding encoding1 = Encoding.UTF8;
    return encoding1.GetString(memStream.ToArray());
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.IO;
using System.Text;  

/// <summary>
/// Summary description for Encryption
/// </summary>
public class Encryption
{
    public TripleDES CreateDES(string key)
    {
        MD5 md5 = new MD5CryptoServiceProvider();
        TripleDES des = new TripleDESCryptoServiceProvider();
        des.Key = md5.ComputeHash(Encoding.Unicode.GetBytes(key));
        des.IV = new byte[des.BlockSize / 8];
        return des;
    }
    public  byte[] Encryptiondata(string PlainText)
    {
        TripleDES des = CreateDES("DreamMLMKey");
        ICryptoTransform ct = des.CreateEncryptor();
        byte[] input = Encoding.Unicode.GetBytes(PlainText);
        return ct.TransformFinalBlock(input, 0, input.Length);
    }

    public string Decryptiondata(string CypherText)
    {
        string stringToDecrypt = CypherText.Replace(" ", "+");
        int len = stringToDecrypt.Length;
        byte[] inputByteArray = Convert.FromBase64String(stringToDecrypt); 

        byte[] b = Convert.FromBase64String(CypherText);
        TripleDES des = CreateDES("DreamMLMKey");
        ICryptoTransform ct = des.CreateDecryptor();
        byte[] output = ct.TransformFinalBlock(b, 0, b.Length);
        return Encoding.Unicode.GetString(output);
    }
    public string Decryptiondataurl(string CypherText)
    {
        string newcyperttext=CypherText.Replace(' ', '+');
        byte[] b = Convert.FromBase64String(newcyperttext);
        TripleDES des = CreateDES("DreamMLMKey");
        ICryptoTransform ct = des.CreateDecryptor();
        byte[] output = ct.TransformFinalBlock(b, 0, b.Length);
        return Encoding.Unicode.GetString(output);
    }


    #region  encryption & Decription
    public  string Encrypt(string input, string key)
    {
        byte[] inputArray = UTF8Encoding.UTF8.GetBytes(input);
        TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
        tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
        tripleDES.Mode = CipherMode.ECB;
        tripleDES.Padding = PaddingMode.PKCS7;
        ICryptoTransform cTransform = tripleDES.CreateEncryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
        tripleDES.Clear();
        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }
    public  string Decrypt(string input, string key)
    {
        byte[] inputArray = Convert.FromBase64String(input);
        TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider();
        tripleDES.Key = UTF8Encoding.UTF8.GetBytes(key);
        tripleDES.Mode = CipherMode.ECB;
        tripleDES.Padding = PaddingMode.PKCS7;
        ICryptoTransform cTransform = tripleDES.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(inputArray, 0, inputArray.Length);
        tripleDES.Clear();
        return UTF8Encoding.UTF8.GetString(resultArray);
    }

    public string encrypt(string encryptString)
    {
        string EncryptionKey = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        byte[] clearBytes = Encoding.Unicode.GetBytes(encryptString);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
                0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
            });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(clearBytes, 0, clearBytes.Length);
                    cs.Close();
                }
                encryptString = Convert.ToBase64String(ms.ToArray());
            }
        }
        return encryptString;
    }

    public string Decrypt(string cipherText)
    {
        string EncryptionKey = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        cipherText = cipherText.Replace(" ", "+");
        byte[] cipherBytes = Convert.FromBase64String(cipherText);
        using (Aes encryptor = Aes.Create())
        {
            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] {
                0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76
            });
            encryptor.Key = pdb.GetBytes(32);
            encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(cipherBytes, 0, cipherBytes.Length);
                    cs.Close();
                }
                cipherText = Encoding.Unicode.GetString(ms.ToArray());
            }
        }
        return cipherText;
    }

    #endregion
}

您必须使用System.Security.Cryptography来使用命名空间;usehash是bool类型,true或false。字符串变量“key”对于加密和解密应该是相同的

//Encryption
public string EncryptText(string toEncrypt, bool useHashing)
    {
        try
        {
            byte[] keyArray;
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

            string key = "String Key Value"; //Based on this key stirng is encrypting
            //System.Windows.Forms.MessageBox.Show(key);
            //If hashing use get hashcode regards to your key
            if (useHashing)
            {
                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                //Always release the resources and flush data
                //of the Cryptographic service provide. Best Practice

                hashmd5.Clear();
            }
            else
                keyArray = UTF8Encoding.UTF8.GetBytes(key);

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            //set the secret key for the tripleDES algorithm
            tdes.Key = keyArray;
            //mode of operation. there are other 4 modes. We choose ECB(Electronic code Book)
            tdes.Mode = CipherMode.ECB;
            //padding mode(if any extra byte added)
            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = tdes.CreateEncryptor();
            //transform the specified region of bytes array to resultArray
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0,          toEncryptArray.Length);
            //Release resources held by TripleDes Encryptor
            tdes.Clear();
            //Return the encrypted data into unreadable string format
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
        catch (Exception e)
        {
            throw e;
        }
    }

    //Decryption
    public string DecryptText(string cipherString, bool useHashing)
    {

        try
        {
            byte[] keyArray;
            //get the byte code of the string

            byte[] toEncryptArray = Convert.FromBase64String(cipherString);

            string key = "String Key Value"; //Based on this key string is decrypted

            if (useHashing)
            {
                //if hashing was used get the hash code with regards to your key
                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                //release any resource held by the MD5CryptoServiceProvider

                hashmd5.Clear();
            }
            else
            {
                //if hashing was not implemented get the byte code of the key
                keyArray = UTF8Encoding.UTF8.GetBytes(key);
            }

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            //set the secret key for the tripleDES algorithm
            tdes.Key = keyArray;
            //mode of operation. there are other 4 modes.
            //We choose ECB(Electronic code Book)

            tdes.Mode = CipherMode.ECB;
            //padding mode(if any extra byte added)
            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = tdes.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock
                    (toEncryptArray, 0, toEncryptArray.Length);
            //Release resources held by TripleDes Encryptor
            tdes.Clear();
            //return the Clear decrypted TEXT
            return UTF8Encoding.UTF8.GetString(resultArray);
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }