/// <summary>
/// 使用RSA实现解密
/// </summary>
/// <param name="privateKey">RSA私钥</param>
/// <param name="data">解密数据</param>
/// <returns></returns>
public static string RSADecrypt(string privateKey, string data)
{
////C#默认只能使用[私钥]进行解密(想使用[私钥加密]可使用第三方组件BouncyCastle来实现)
////创建RSA对象并载入[私钥]
//RSACryptoServiceProvider rsaPrivate = new RSACryptoServiceProvider();
//RSAExtension.FromXmlString(rsaPrivate, privateKey);
////对数据进行解密
//byte[] privateValue = rsaPrivate.Decrypt(Convert.FromBase64String(data), false);//使用Base64将string转换为byte
//string privateStr = Encoding.UTF8.GetString(privateValue);
//return privateStr;
using (RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider())
{
var inputBytes = Convert.FromBase64String(data);
RSAExtension.FromXmlString(rsaProvider, privateKey);
int bufferSize = rsaProvider.KeySize / 8;
var buffer = new byte[bufferSize];
using (MemoryStream inputStream = new MemoryStream(inputBytes),
outputStream = new MemoryStream())
{
while (true)
{
int readSize = inputStream.Read(buffer, 0, bufferSize);
if (readSize <= 0)
{
break;
}
var temp = new byte[readSize];
Array.Copy(buffer, 0, temp, 0, readSize);
var rawBytes = rsaProvider.Decrypt(temp, false);
outputStream.Write(rawBytes, 0, rawBytes.Length);
}
return(Encoding.UTF8.GetString(outputStream.ToArray()));
}
}
}
/// <summary>
/// 使用RSA实现加密
/// </summary>
/// <param name="publicKey">RSA公钥</param>
/// <param name="data">加密数据</param>
/// <returns></returns>
public static string RSAEncrypt(string publicKey, string data)
{
////创建RSA对象并载入[公钥]
//RSACryptoServiceProvider rsaPublic = new RSACryptoServiceProvider();
//RSAExtension.FromXmlString(rsaPublic, publicKey);
////对数据进行加密
//byte[] publicValue = rsaPublic.Encrypt(Encoding.UTF8.GetBytes(data), false);
//string publicStr = Convert.ToBase64String(publicValue);//使用Base64将byte转换为string
//return publicStr;
using (var rsaProvider = new RSACryptoServiceProvider())
{
var inputBytes = Encoding.UTF8.GetBytes(data); //有含义的字符串转化为字节流
RSAExtension.FromXmlString(rsaProvider, publicKey); //载入公钥
int bufferSize = (rsaProvider.KeySize / 8) - 11; //单块最大长度
var buffer = new byte[bufferSize];
using (MemoryStream inputStream = new MemoryStream(inputBytes),
outputStream = new MemoryStream())
{
while (true)
{ //分段加密
int readSize = inputStream.Read(buffer, 0, bufferSize);
if (readSize <= 0)
{
break;
}
var temp = new byte[readSize];
Array.Copy(buffer, 0, temp, 0, readSize);
var encryptedBytes = rsaProvider.Encrypt(temp, false);
outputStream.Write(encryptedBytes, 0, encryptedBytes.Length);
}
return(Convert.ToBase64String(outputStream.ToArray()));//转化为字节流方便传输
}
}
}
