本文实例为大家分享了.NET使用RSA加密解密的具体代码，供大家参考，具体内容如下

PassWordHelper.cs代码:

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

namespace Utils
{
 /// <summary>
 /// 密码加密解密操作相关类
 /// </summary>
 public static class PassWordHelper
 {
 #region MD5 加密

 /// <summary>
 /// MD5加密
 /// </summary>
 public static string Md532(this string source)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 MD5 md5 = MD5.Create();
 return HashAlgorithmBase(md5, source, encoding);
 }

 /// <summary>
 /// 加盐MD5加密
 /// </summary>
 public static string Md532Salt(this string source, string salt)
 {
 return string.IsNullOrEmpty(source) ? source.Md532() : (source + "『" + salt + "』").Md532();
 }

 #endregion

 #region SHA 加密

 /// <summary>
 /// SHA1 加密
 /// </summary>
 public static string Sha1(this string source)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 SHA1 sha1 = new SHA1CryptoServiceProvider();
 return HashAlgorithmBase(sha1, source, encoding);
 }

 /// <summary>
 /// SHA256 加密
 /// </summary>
 public static string Sha256(this string source)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 SHA256 sha256 = new SHA256Managed();
 return HashAlgorithmBase(sha256, source, encoding);
 }

 /// <summary>
 /// SHA512 加密
 /// </summary>
 public static string Sha512(this string source)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 SHA512 sha512 = new SHA512Managed();
 return HashAlgorithmBase(sha512, source, encoding);
 }

 #endregion

 #region HMAC 加密

 /// <summary>
 /// HmacSha1 加密
 /// </summary>
 public static string HmacSha1(this string source, string keyVal)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 byte[] keyStr = encoding.GetBytes(keyVal);
 HMACSHA1 hmacSha1 = new HMACSHA1(keyStr);
 return HashAlgorithmBase(hmacSha1, source, encoding);
 }

 /// <summary>
 /// HmacSha256 加密
 /// </summary>
 public static string HmacSha256(this string source, string keyVal)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 byte[] keyStr = encoding.GetBytes(keyVal);
 HMACSHA256 hmacSha256 = new HMACSHA256(keyStr);
 return HashAlgorithmBase(hmacSha256, source, encoding);
 }

 /// <summary>
 /// HmacSha384 加密
 /// </summary>
 public static string HmacSha384(this string source, string keyVal)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 byte[] keyStr = encoding.GetBytes(keyVal);
 HMACSHA384 hmacSha384 = new HMACSHA384(keyStr);
 return HashAlgorithmBase(hmacSha384, source, encoding);
 }

 /// <summary>
 /// HmacSha512 加密
 /// </summary>
 public static string HmacSha512(this string source, string keyVal)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 byte[] keyStr = encoding.GetBytes(keyVal);
 HMACSHA512 hmacSha512 = new HMACSHA512(keyStr);
 return HashAlgorithmBase(hmacSha512, source, encoding);
 }

 /// <summary>
 /// HmacMd5 加密
 /// </summary>
 public static string HmacMd5(this string source, string keyVal)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 byte[] keyStr = encoding.GetBytes(keyVal);
 HMACMD5 hmacMd5 = new HMACMD5(keyStr);
 return HashAlgorithmBase(hmacMd5, source, encoding);
 }

 /// <summary>
 /// HmacRipeMd160 加密
 /// </summary>
 public static string HmacRipeMd160(this string source, string keyVal)
 {
 if (string.IsNullOrEmpty(source)) return null;
 var encoding = Encoding.UTF8;
 byte[] keyStr = encoding.GetBytes(keyVal);
 HMACRIPEMD160 hmacRipeMd160 = new HMACRIPEMD160(keyStr);
 return HashAlgorithmBase(hmacRipeMd160, source, encoding);
 }

 #endregion

 #region AES 加密解密

 /// <summary> 
 /// AES加密 
 /// </summary> 
 /// <param name="source">待加密字段</param> 
 /// <param name="keyVal">密钥值</param> 
 /// <param name="ivVal">加密辅助向量</param> 
 /// <returns></returns> 
 public static string AesStr(this string source, string keyVal, string ivVal)
 {
 var encoding = Encoding.UTF8;
 byte[] btKey = keyVal.FormatByte(encoding);
 byte[] btIv = ivVal.FormatByte(encoding);
 byte[] byteArray = encoding.GetBytes(source);
 string encrypt;
 Rijndael aes = Rijndael.Create();
 using (MemoryStream mStream = new MemoryStream())
 {
 using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(btKey, btIv), CryptoStreamMode.Write))
 {
 cStream.Write(byteArray, 0, byteArray.Length);
 cStream.FlushFinalBlock();
 encrypt = Convert.ToBaseString(mStream.ToArray());
 }
 }
 aes.Clear();
 return encrypt;
 }

 /// <summary> 
 /// AES解密 
 /// </summary> 
 /// <param name="source">待加密字段</param> 
 /// <param name="keyVal">密钥值</param> 
 /// <param name="ivVal">加密辅助向量</param> 
 /// <returns></returns> 
 public static string UnAesStr(this string source, string keyVal, string ivVal)
 {
 var encoding = Encoding.UTF8;
 byte[] btKey = keyVal.FormatByte(encoding);
 byte[] btIv = ivVal.FormatByte(encoding);
 byte[] byteArray = Convert.FromBaseString(source);
 string decrypt;
 Rijndael aes = Rijndael.Create();
 using (MemoryStream mStream = new MemoryStream())
 {
 using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(btKey, btIv), CryptoStreamMode.Write))
 {
 cStream.Write(byteArray, 0, byteArray.Length);
 cStream.FlushFinalBlock();
 decrypt = encoding.GetString(mStream.ToArray());
 }
 }
 aes.Clear();
 return decrypt;
 }

 /// <summary> 
 /// AES Byte类型 加密 
 /// </summary> 
 /// <param name="data">待加密明文</param> 
 /// <param name="keyVal">密钥值</param> 
 /// <param name="ivVal">加密辅助向量</param> 
 /// <returns></returns> 
 public static byte[] AesByte(this byte[] data, string keyVal, string ivVal)
 {
 byte[] bKey = new byte[32];
 Array.Copy(Encoding.UTF8.GetBytes(keyVal.PadRight(bKey.Length)), bKey, bKey.Length);
 byte[] bVector = new byte[16];
 Array.Copy(Encoding.UTF8.GetBytes(ivVal.PadRight(bVector.Length)), bVector, bVector.Length);
 byte[] cryptograph;
 Rijndael aes = Rijndael.Create();
 try
 {
 using (MemoryStream mStream = new MemoryStream())
 {
 using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bVector), CryptoStreamMode.Write))
 {
 cStream.Write(data, 0, data.Length);
 cStream.FlushFinalBlock();
 cryptograph = mStream.ToArray();
 }
 }
 }
 catch
 {
 cryptograph = null;
 }
 return cryptograph;
 }

 /// <summary> 
 /// AES Byte类型 解密 
 /// </summary> 
 /// <param name="data">待解密明文</param> 
 /// <param name="keyVal">密钥值</param> 
 /// <param name="ivVal">加密辅助向量</param> 
 /// <returns></returns> 
 public static byte[] UnAesByte(this byte[] data, string keyVal, string ivVal)
 {
 byte[] bKey = new byte[32];
 Array.Copy(Encoding.UTF8.GetBytes(keyVal.PadRight(bKey.Length)), bKey, bKey.Length);
 byte[] bVector = new byte[16];
 Array.Copy(Encoding.UTF8.GetBytes(ivVal.PadRight(bVector.Length)), bVector, bVector.Length);
 byte[] original;
 Rijndael aes = Rijndael.Create();
 try
 {
 using (MemoryStream mStream = new MemoryStream(data))
 {
 using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read))
 {
 using (MemoryStream originalMemory = new MemoryStream())
 {
 byte[] buffer = new byte[1024];
 int readBytes;
 while ((readBytes = cStream.Read(buffer, 0, buffer.Length)) > 0)
 {
 originalMemory.Write(buffer, 0, readBytes);
 }

 original = originalMemory.ToArray();
 }
 }
 }
 }
 catch
 {
 original = null;
 }
 return original;
 }

 #endregion

 #region RSA 加密解密

 //密钥对，请配合密钥生成工具使用『 http://download.csdn.net/detail/downiis6/94639 』
 private const string PublicRsaKey = @"<RSAKeyValue>
 <Modulus>8Yvf/LjXRhCuOREk2CuSYvbD/RadwJ4sjHREIpQVKwkTlG3BtRgpnaMcoeLAesmwvpBWnqK4hBkYLxhRj+NEKnlGrJ+LkNMnZr0/4CMuulZFAnx7iQYaSq7Eh7kBKGLofc05CjZguYpnPNxHIv4VNx+a9tIh+hnhjrmkJLUm3l0=</Modulus>
 <Exponent>AQAB</Exponent>
</RSAKeyValue>";
 private const string PrivateRsaKey = @"<RSAKeyValue>
 <Modulus>8Yvf/LjXRhCuOREk2CuSYvbD/RadwJ4sjHREIpQVKwkTlG3BtRgpnaMcoeLAesmwvpBWnqK4hBkYLxhRj+NEKnlGrJ+LkNMnZr0/4CMuulZFAnx7iQYaSq7Eh7kBKGLofc05CjZguYpnPNxHIv4VNx+a9tIh+hnhjrmkJLUm3l0=</Modulus>
 <Exponent>AQAB</Exponent>
 <P>/xAaa/4dtDxcEAk5koSZBPjuxqvKJikpwLA1nCm3xxAUMDVxSwQyr+SHFaCnBN9kqaNkQCY6kDCfJXFWPOj0Bw==</P>
 <Q>8m8PFVA4sO0oEKMVQxt+ivDTHFuk/W154UL3IgC9Y6bzlvYewXZSzZHmxZXXM1lFtwoYG/k+focXBITsiJepew==</Q>
 <DP>ONVSvdt6rO2CKgSUMoSfQA9jzRr8STKE3i2lVG2rSIzZosBVxTxjOvQ18WjBroFEgdQpg23BQN3EqGgvqhTSQw==</DP>
 <DQ>gfp7SsEM9AbioTDemHEoQlPly+FyrxE/9D8UAt4ErGX5WamxSaYntOGRqcOxcm1djEpULMNP90R0Wc7uhjlR+w==</DQ>
 <InverseQ>C0eBsp2iMOxWwKo+EzkHOP0H+YOitUVgjekGXmSt9a3TvikQNaJ5ATlqKsZaMGsnB6UIHei+kUaCusVX0HgQ2A==</InverseQ>
 <D>tPYxEfo9Nb3LeO+SJe3G1yO+w37NIwCdqYB1h15f2YUMSThNVmpKy1HnYpUp1RQDuVETw/duu3C9gJL8kAsZBjBrVZ0zC/JZsgvSNprfUK3Asc4FgFsGfQGKW1nvvgdMbvqr4ClB0R8czkki+f9Oc5ea/RMqXxlI+XjzMYDEknU=</D>
</RSAKeyValue>";

 /// <summary>
 /// RSA 加密
 /// </summary>
 public static string Rsa(this string source)
 {
 RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
 rsa.FromXmlString(PublicRsaKey);
 var cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(source), true);
 return Convert.ToBaseString(cipherbytes);
 }

 /// <summary>
 /// RSA解密
 /// </summary>
 public static string UnRsa(this string source)
 {
 RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
 rsa.FromXmlString(PrivateRsaKey);
 var cipherbytes = rsa.Decrypt(Convert.FromBaseString(source), true);
 return Encoding.UTF8.GetString(cipherbytes);
 }

 #endregion

 #region DES 加密解密

 /// <summary>
 /// DES 加密
 /// </summary>
 public static string Des(this string source, string keyVal, string ivVal)
 {
 try
 {
 byte[] data = Encoding.UTF8.GetBytes(source);
 var des = new DESCryptoServiceProvider { Key = Encoding.ASCII.GetBytes(keyVal.Length > 8 ? keyVal.Substring(0, 8) : keyVal), IV = Encoding.ASCII.GetBytes(ivVal.Length > 8 ? ivVal.Substring(0, 8) : ivVal) };
 var desencrypt = des.CreateEncryptor();
 byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
 return BitConverter.ToString(result);
 }
 catch { return "转换出错！"; }
 }

 /// <summary>
 /// DES 解密
 /// </summary>
 public static string UnDes(this string source, string keyVal, string ivVal)
 {
 try
 {
 string[] sInput = source.Split("-".ToCharArray());
 byte[] data = new byte[sInput.Length];
 for (int i = 0; i < sInput.Length; i++)
 {
 data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
 }
 var des = new DESCryptoServiceProvider { Key = Encoding.ASCII.GetBytes(keyVal.Length > 8 ? keyVal.Substring(0, 8) : keyVal), IV = Encoding.ASCII.GetBytes(ivVal.Length > 8 ? ivVal.Substring(0, 8) : ivVal) };
 var desencrypt = des.CreateDecryptor();
 byte[] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
 return Encoding.UTF8.GetString(result);
 }
 catch { return "解密出错！"; }
 }

 #endregion

 #region TripleDES 加密解密

 /// <summary>
 /// DES3 加密
 /// </summary>
 public static string Des3(this string source, string keyVal)
 {
 try
 {
 TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider
 {
 Key = keyVal.FormatByte(Encoding.UTF8),
 Mode = CipherMode.ECB,
 Padding = PaddingMode.PKCS7
 };
 using (MemoryStream ms = new MemoryStream())
 {
 byte[] btArray = Encoding.UTF8.GetBytes(source);
 try
 {
 using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
 {
 cs.Write(btArray, 0, btArray.Length);
 cs.FlushFinalBlock();
 }
 return ms.ToArray().Bytes2Str();
 }
 catch { return source; }
 }
 }
 catch
 {
 return "TripleDES加密出现错误";
 }
 }

 /// <summary>
 /// DES3 解密
 /// </summary>
 public static string UnDes3(this string source, string keyVal)
 {
 try
 {
 byte[] byArray = source.Str2Bytes();
 TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider
 {
 Key = keyVal.FormatByte(Encoding.UTF8),
 Mode = CipherMode.ECB,
 Padding = PaddingMode.PKCS7
 };
 using (MemoryStream ms = new MemoryStream())
 {
 using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
 {
 cs.Write(byArray, 0, byArray.Length);
 cs.FlushFinalBlock();
 cs.Close();
 ms.Close();
 return Encoding.UTF8.GetString(ms.ToArray());
 }
 }
 }
 catch
 {
 return "TripleDES解密出现错误";
 }
 }

 #endregion

 #region BASE 加密解密

 /// <summary>
 /// BASE 加密
 /// </summary>
 /// <param name="source">待加密字段</param>
 /// <returns></returns>
 public static string Base(this string source)
 {
 var btArray = Encoding.UTF8.GetBytes(source);
 return Convert.ToBaseString(btArray, 0, btArray.Length);
 }

 /// <summary>
 /// BASE 解密
 /// </summary>
 /// <param name="source">待解密字段</param>
 /// <returns></returns>
 public static string UnBase(this string source)
 {
 var btArray = Convert.FromBaseString(source);
 return Encoding.UTF8.GetString(btArray);
 }

 #endregion

 #region 内部方法

 /// <summary>
 /// 转成数组
 /// </summary>
 private static byte[] Str2Bytes(this string source)
 {
 source = source.Replace(" ", "");
 byte[] buffer = new byte[source.Length / 2];
 for (int i = 0; i < source.Length; i += 2) buffer[i / 2] = Convert.ToByte(source.Substring(i, 2), 16);
 return buffer;
 }

 /// <summary>
 /// 转换成字符串
 /// </summary>
 private static string Bytes2Str(this IEnumerable<byte> source, string formatStr = "{0:X2}")
 {
 StringBuilder pwd = new StringBuilder();
 foreach (byte btStr in source) { pwd.AppendFormat(formatStr, btStr); }
 return pwd.ToString();
 }

 private static byte[] FormatByte(this string strVal, Encoding encoding)
 {
 return encoding.GetBytes(strVal.Base().Substring(0, 16).ToUpper());
 }

 /// <summary>
 /// HashAlgorithm 加密统一方法
 /// </summary>
 private static string HashAlgorithmBase(HashAlgorithm hashAlgorithmObj, string source, Encoding encoding)
 {
 byte[] btStr = encoding.GetBytes(source);
 byte[] hashStr = hashAlgorithmObj.ComputeHash(btStr);
 return hashStr.Bytes2Str();
 }

 #endregion
 }
}

Program.cs代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Test
{
 class Program
 {
 static void Main(string[] args)
 {

 string plainText = "这是一条被和谐的消息！";
 //加密明文，获得密文
 string EncryptText= Utils.PassWordHelper.Rsa(plainText);
 Console.WriteLine(EncryptText);

 //解密密文，获得明文
 string DecryptText = Utils.PassWordHelper.UnRsa(EncryptText);
 Console.WriteLine(DecryptText);
 Console.ReadKey();

 }
 }
}

运行结果如图：