.Net Core下使用 RSA
.Net Core 下,以前的RSA加密解密的API有较大的改变,这里记录下 使用过程中的一些区别.
要进行.Net Core下的RSA相关操作, 要用到以下几个包:
<ItemGroup> <PackageReferenceInclude="System.Security.Cryptography.Csp"Version="4.3.0"/> <PackageReferenceInclude="System.Security.Cryptography.Algorithms"Version="4.3.0"/> </ItemGroup>
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RSACryptoServiceProvider
在Windows 环境下依然可以使用RSACryptoServiceProvider, 但在Linux 环境下编译不过. 参考 dudu 的文章 .net core中使用openssl的公钥私钥进行加解密 -
FromXmlString方法和ToXmlString
由于不在使用RSACryptoServiceProvider这两个方法不在提供,我们可以通过扩展方法来添加这两个方法,以处理C#生成的密钥.
相关代码:
using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Xml;
namespace libs
{
public class RsaHelper
{
#region Fields
private const string PubKeyXML="<RSAKeyValue><Modulus>yuW8mDcb1+n/fIKqNaT3LQ3qsKNBg4GC7ZD2KXEJqMOyk5x8JOgwgg3mwnie1LfqryzYHSIJLjxR35WznjrCBT+p07IkitGCPY6JuNI/w1KmaoPueb8V/j8YvPQEs6UIXgj/PJdsw1xPgzIxZj9fyxnXOTqbIee4bTOkT28610yKjiq/90dGvWFRmFWPhjTlet02Dt4Qe0nrK/DMCw2dIIcBqrAJyQCMa8dKObbx0Q7+32X71MB3IyzCWZWou8xMBNAxbIYF3Yu6zjLmcBjWpLAAud3tHp72XJ27sNSfZNR1x4Liqo9NnjOivuRnxIxwCpexBh42Qsfx7JSm3aKeZQ==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
private const string PrivKeyXml="<RSAKeyValue><Modulus>yuW8mDcb1+n/fIKqNaT3LQ3qsKNBg4GC7ZD2KXEJqMOyk5x8JOgwgg3mwnie1LfqryzYHSIJLjxR35WznjrCBT+p07IkitGCPY6JuNI/w1KmaoPueb8V/j8YvPQEs6UIXgj/PJdsw1xPgzIxZj9fyxnXOTqbIee4bTOkT28610yKjiq/90dGvWFRmFWPhjTlet02Dt4Qe0nrK/DMCw2dIIcBqrAJyQCMa8dKObbx0Q7+32X71MB3IyzCWZWou8xMBNAxbIYF3Yu6zjLmcBjWpLAAud3tHp72XJ27sNSfZNR1x4Liqo9NnjOivuRnxIxwCpexBh42Qsfx7JSm3aKeZQ==</Modulus><Exponent>AQAB</Exponent><P>5LPiWxYbwHe/i/IRKJ84B5PrSPdtPqn1Uj/FUu+4ZMpNw3UEyt0u73MLgXLjwCrx7A484cLS4el5z0eOBAnjw2d1Hm6E/jh8sH5zQHv7u1rFefUMYRMYXSqirTVlj226ccFRE9OZ3lKPuXrodappqNstjlprV1AMDxfLHA1aUXs=</P><Q>4x1cWbomvGv8JKlginM9GN0sTcM2BeO961dE2K/zBN5CnmW3um7PvDHyb+ntYYoOaW1lx8V/TB3X5w6ywsMiZhe5uXmqiSWaj8vGAyJ+NM+K2AgHDcEqLFUiyTJ/XkqV2k7iMcSLuRO738OECeC/bEu3HGoGGryJWuEC+fEvGZ8=</Q><DP>B0Bk5vp2es3RNwC/5ofV4PehuDiQMDJ3Yto+yXhsYlW/zXjCZCRLPrBpJvubmRZDgXaaG5Zv1VXv1NCyAhLGNAXtwr9CXEUyPu5jfSHxQ2mHZWyNre5LEXkum0tcIwYZqU214mkNMe1wPTNWd5SlsQLyGNdpG+Wf3EKm4AbUXE0=</DP><DQ>Ea8klLwA7iT+YiBqKv2kIT5/h6KOn1DHZf7KlpDEvHlN+KV08+hS9pVxCjPNzw1/58ej6DVBnzynpg8n7jBhik+In5+QntM1wMKeLXpPF2+doQqm+fQzg3Yxmjb7Ye0u0+vWgweJ1aRquZawvlAot5cBsA21YfmSPGhO4gVcpIM=</DQ><InverseQ>bSssYm1rAcXrZ3G9gDki8Qj0HUUXRrjNJCK2QTHhU5cGY5yiyQE+JVkHOkteKDEaGhaMbGj9cn4D6x22FVV6F9zx+L1RFfrtJpdD9/iYKll6nD3HzpSQ+3AoSE8R8e6bQEWlioW8dICm4A1Acaj7kJyJw1JpJKfjnRrsr05dnQI=</InverseQ><D>KB+GTBOZzfjYLScpwbH9r0sxPf0K15ak7ZXdGBTidB0/EzG+2w2Piih1mb+AqVA1eK7Fjf1NE3eaOTzBaGj2NVOBoft4fnsv5jxpv8LUGSwe/LFaV3kSQFT572PSCjR4kx/0WWcYewmmL6udWTrvFprllMuiIfJQ5kdwFsVIPYrrN7D2A6FOyVuXmmr1DW6+6E/MUjvOWA2UBf4VeybQRsjekaD2ckIM0UK/7+8CWIoNtUzK2ZJ1oqyOk5oVk8Ja0VI3AZSZL1s5Xx/estVZfpmtVGg20T21yXZ7PREpcZQxK67ywNFm12dreZw8sByVvLGKazJfGtijSfHadEPngQ==</D></RSAKeyValue>";
#endregion
#region Methods
public byte[] Encrypt(byte[] input)
{
Func<byte[], byte[]> encrypt = sou =>
{
using (var rsa = RSA.Create())
{
rsa.FromXmlString(PubKeyXML);
int maxBlockSize = rsa.KeySize / 8 - 11;
if (sou.Length <= maxBlockSize)
{
return rsa.Encrypt(sou, RSAEncryptionPadding.Pkcs1);
}
using (MemoryStream plaiStream = new MemoryStream(sou))
{
using (MemoryStream crypStream = new MemoryStream())
{
byte[] buffer = new byte[maxBlockSize];
int blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
byte[] toEncrypt = new byte[blockSize];
Array.Copy(buffer, 0, toEncrypt, 0, blockSize);
byte[] cryptograph = rsa.Encrypt(toEncrypt, RSAEncryptionPadding.Pkcs1);
crypStream.Write(cryptograph, 0, cryptograph.Length);
blockSize = plaiStream.Read(buffer, 0, maxBlockSize);
}
return crypStream.ToArray();
}
}
}
};
return MarkData(encrypt(input));
}
public byte[] Decrypt(byte[] input)
{
if (IsEncrypt(input))
{
Func<byte[], byte[]> decrypt = sou =>
{
using (var rsa = RSA.Create())
{
rsa.FromXmlString(PrivKeyXml);
int maxBlockSize = rsa.KeySize / 8;
if (sou.Length <= maxBlockSize)
return rsa.Decrypt(sou, RSAEncryptionPadding.Pkcs1);
using (MemoryStream crypStream = new MemoryStream(sou))
{
using (MemoryStream plaiStream = new MemoryStream())
{
byte[] buffer = new byte[maxBlockSize];
int blockSize = crypStream.Read(buffer, 0, maxBlockSize);
while (blockSize > 0)
{
byte[] toDecrypt = new byte[blockSize];
Array.Copy(buffer, 0, toDecrypt, 0, blockSize);
byte[] plaintext = rsa.Decrypt(toDecrypt, RSAEncryptionPadding.Pkcs1);
plaiStream.Write(plaintext, 0, plaintext.Length);
blockSize = crypStream.Read(buffer, 0, maxBlockSize);
}
return plaiStream.ToArray();
}
}
}
};
return decrypt(ClearDataMark(input));
}
return input;
}
#endregion
#region Utilities
private byte[] MarkData(byte[] input)
{
byte[] newBytes = new byte[input.Length + 200];
for (int i = 0; i < newBytes.Length; i++)
{
if (i < 100 || i > newBytes.Length - 100 - 1)
{
newBytes[i] = 0;
}
else
{
newBytes[i] = input[i - 100];
}
}
return newBytes;
}
private byte[] ClearDataMark(byte[] input)
{
byte[] newBytes = new byte[input.Length - 200];
for (int i = 100; i < input.Length - 100; i++)
{
newBytes[i - 100] = input[i];
}
return newBytes;
}
private bool IsEncrypt(byte[] input)
{
for (int i = 0; i < 100; i++)
{
if (input[i] != 0 || input[input.Length - i - 1] != 0)
{
return false;
}
}
return true;
}
#endregion
}
}
RSA扩展方法:
using System;
using System.IO;
using System.Security.Cryptography;
using System.Xml;
namespace demo
{
public static class RsaExtention
{
public static void FromXmlString(this RSA rsa, string xmlString)
{
RSAParameters parameters = new RSAParameters();
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlString);
if (xmlDoc.DocumentElement.Name.Equals("RSAKeyValue"))
{
foreach (XmlNode node in xmlDoc.DocumentElement.ChildNodes)
{
switch (node.Name)
{
case "Modulus": parameters.Modulus = Convert.FromBase64String(node.InnerText); break;
case "Exponent": parameters.Exponent = Convert.FromBase64String(node.InnerText); break;
case "P": parameters.P = Convert.FromBase64String(node.InnerText); break;
case "Q": parameters.Q = Convert.FromBase64String(node.InnerText); break;
case "DP": parameters.DP = Convert.FromBase64String(node.InnerText); break;
case "DQ": parameters.DQ = Convert.FromBase64String(node.InnerText); break;
case "InverseQ": parameters.InverseQ = Convert.FromBase64String(node.InnerText); break;
case "D": parameters.D = Convert.FromBase64String(node.InnerText); break;
}
}
}
else
{
throw new Exception("Invalid XML RSA key.");
}
rsa.ImportParameters(parameters);
}
public static string ToXmlString(this RSA rsa, bool includePrivateParameters)
{
RSAParameters parameters = rsa.ExportParameters(includePrivateParameters);
if (includePrivateParameters)
{
return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
Convert.ToBase64String(parameters.Modulus),
Convert.ToBase64String(parameters.Exponent),
Convert.ToBase64String(parameters.P),
Convert.ToBase64String(parameters.Q),
Convert.ToBase64String(parameters.DP),
Convert.ToBase64String(parameters.DQ),
Convert.ToBase64String(parameters.InverseQ),
Convert.ToBase64String(parameters.D));
}
return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
Convert.ToBase64String(parameters.Modulus),
Convert.ToBase64String(parameters.Exponent));
}
}
}
- RNGCryptoServiceProvider
如果以前代码使用RNGCryptoServiceProvider来生成随机盐值,.Net Core中不在提供该方法,可以使用RandomNumberGenerator方法替代.
// old publicvirtualstringCreateSaltKey(int size) { //generate a cryptographic random number using(var provider =newRNGCryptoServiceProvider()) { var buff =newbyte[size]; provider.GetBytes(buff); // Return a Base64 string representation of the random number returnConvert.ToBase64String(buff); } } //new publicvirtualstringCreateSaltKey(int size) { //generate a cryptographic random number using(var random =RandomNumberGenerator.Create()) { var buff =newbyte[size]; random.GetBytes(buff); // Return a Base64 string representation of the random number returnConvert.ToBase64String(buff); } }
相关链接
