如何在 RSA 加密 C#（.net 标准 2.0）中使用 public 密钥
How to use public key in RSA encryption C# (.net standard 2.0)
我正在开发一个 .net 标准（.net 标准 2.0）库。
我有一个 public 密钥，它是在服务器端创建的，我通过 api 调用收到了它。
现在我有一个要使用 RSA 算法加密的字符串。此外，我必须在加密我拥有的字符串时使用此 public 密钥。
我检查了各种样本，但没有任何帮助。
试过这个RSA public key encryption in C#
但出现错误“此平台不支持操作。” .
尝试了 this 一个，但找不到使用我从服务器收到的 public 密钥的方法。
这是我试过的最新代码。我不确定如何以及在何处使用我的 public 密钥字符串。
static public byte[] Encryption(byte[] Data, RSAParameters RSAKey, bool DoOAEPPadding)
{
try
{
byte[] encryptedData;
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
RSA.ImportParameters(RSAKey);
encryptedData = RSA.Encrypt(Data, DoOAEPPadding);
}
return encryptedData;
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] Decryption(byte[] Data, RSAParameters RSAKey, bool DoOAEPPadding)
{
try
{
byte[] decryptedData;
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
RSA.ImportParameters(RSAKey);
decryptedData = RSA.Decrypt(Data, DoOAEPPadding);
}
return decryptedData;
}
catch (CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
在这里我可以看到RSAKey但是它不接受字符串输入。
任何人都可以指导我一些示例，通过这些示例我可以使用我拥有的 public 加密和解密简单的文本。
谢谢，
努鲁
下面是一个完整的工作代码，它使用 XML 中的 RSA public 密钥加密字符串，并使用 RSA 私钥解密密文（以及 XML编码）。密文以 base64 编码。这里给一个在线编译器link看代码运行：https://repl.it/@javacrypto/CpcCsharpRsaEncryptionOaepSha1String#main.cs
输出：
RSA 2048 encryption OAEP SHA-1 string
plaintext: The quick brown fox jumps over the lazy dog
* * * encrypt the plaintext with the RSA public key * * *
ciphertextBase64: lFZwBN5SnlqAKEYktjjTmDUyIAFA86CDIrOyPeRLVXLIManP6wTUgZ3NBSYynfgwXTmVzhPQL3wZ6kngWIgVbl1sMOSiTt6BOvop5HwEU6ejUOrhgDzuxSnA4e8txNG0X8NZ4kt1bzE42gHlbjxHG+CYawAVYECPMyZ4Jc/n7qH8McsUh3n/KUOB2h5R6DULjf2Qfl4aQHppbEeECNmpSFJFUSu3iGBI7hacHbb+1myyLteS1o3FiBuSVbG+L7h8DEokbhE5yVTwamFF+qM+/HTWeGfE+CGC6Kb8cAucP7Zoov6e+Gr7aFYMvhrWjTvApzMBu5XD0j3JzxQD9OmA8g==
* * * decrypt the ciphertext with the RSA private key * * *
ciphertextReceivedBase64: lFZwBN5SnlqAKEYktjjTmDUyIAFA86CDIrOyPeRLVXLIManP6wTUgZ3NBSYynfgwXTmVzhPQL3wZ6kngWIgVbl1sMOSiTt6BOvop5HwEU6ejUOrhgDzuxSnA4e8txNG0X8NZ4kt1bzE42gHlbjxHG+CYawAVYECPMyZ4Jc/n7qH8McsUh3n/KUOB2h5R6DULjf2Qfl4aQHppbEeECNmpSFJFUSu3iGBI7hacHbb+1myyLteS1o3FiBuSVbG+L7h8DEokbhE5yVTwamFF+qM+/HTWeGfE+CGC6Kb8cAucP7Zoov6e+Gr7aFYMvhrWjTvApzMBu5XD0j3JzxQD9OmA8g==
decryptedData: The quick brown fox jumps over the lazy dog
安全警告：代码使用硬编码RSA [示例]密钥仅用于演示。该代码没有异常处理，仅用于教育目的。
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
class RsaEncryptionOaepSha1 {
static void Main() {
Console.WriteLine("RSA 2048 encryption OAEP SHA-1 string");
string dataToEncryptString = "The quick brown fox jumps over the lazy dog";
Console.WriteLine("plaintext: " + dataToEncryptString);
// # # # usually we would load the private and public key from a file or keystore # # #
// # # # here we use hardcoded keys for demonstration - don't do this in real programs # # #
string filenamePrivateKeyXml = "privatekey2048.xml";
string filenamePublicKeyXml = "publickey2048.xml";
try {
// encryption
Console.WriteLine("\n* * * encrypt the plaintext with the RSA public key * * *");
//string publicKeyLoad = loadRsaPublicKeyPem();
// use this in production
string publicKeyLoad = File.ReadAllText(filenamePublicKeyXml);
byte[] dataToEncrypt = Encoding.UTF8.GetBytes(dataToEncryptString);
string ciphertextBase64 = Base64Encoding(rsaEncryptionOaepSha1(publicKeyLoad, dataToEncrypt));
//string ciphertextBase64 = "";
Console.WriteLine("ciphertextBase64: " + ciphertextBase64);
// transport the encrypted data to recipient
// receiving the encrypted data, decryption
Console.WriteLine("\n* * * decrypt the ciphertext with the RSA private key * * *");
string ciphertextReceivedBase64 = ciphertextBase64;
Console.WriteLine("ciphertextReceivedBase64: " + ciphertextReceivedBase64);
//string privateKeyLoad = loadRsaPrivateKeyPem();
// use this in production
string privateKeyLoad = File.ReadAllText(filenamePrivateKeyXml);
byte[] ciphertextReceived = Base64Decoding(ciphertextReceivedBase64);
byte[] decryptedtextByte = rsaDecryptionOaepSha1(privateKeyLoad, ciphertextReceived);
Console.WriteLine("decryptedData: " + Encoding.UTF8.GetString(decryptedtextByte, 0, decryptedtextByte.Length));
}
catch(ArgumentNullException) {
Console.WriteLine("The data was not RSA encrypted");
}
}
public static byte[] rsaEncryptionOaepSha1(string publicKeyXml, byte[] plaintext) {
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider(2048);
RSAalg.PersistKeyInCsp = false;
RSAalg.FromXmlString(publicKeyXml);
return RSAalg.Encrypt(plaintext, true);
}
public static byte[] rsaDecryptionOaepSha1(string privateKeyXml, byte[] ciphertext) {
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider(2048);
RSAalg.PersistKeyInCsp = false;
RSAalg.FromXmlString(privateKeyXml);
return RSAalg.Decrypt(ciphertext, true);
}
static string Base64Encoding(byte[] input) {
return Convert.ToBase64String(input);
}
static byte[] Base64Decoding(String input) {
return Convert.FromBase64String(input);
}
public static string loadRsaPublicKeyPem() {
return "<RSAKeyValue><Modulus>8EmWJUZ/Osz4vXtUU2S+0M4BP9+s423gjMjoX+qP1iCnlcRcFWxthQGN2CWSMZwR/vY9V0un/nsIxhZSWOH9iKzqUtZD4jt35jqOTeJ3PCSr48JirVDNLet7hRT37Ovfu5iieMN7ZNpkjeIG/CfT/QQl7R+kO/EnTmL3QjLKQNV/HhEbHS2/44x7PPoHqSqkOvl8GW0qtL39gTLWgAe801/w5PmcQ38CKG0oT2gdJmJqIxNmAEHkatYGHcMDtXRBpOhOSdraFj6SmPyHEmLBishaq7Jm8NPPNK9QcEQ3q+ERa5M6eM72PpF93g2p5cjKgyzzfoIV09Zb/LJ2aW2gQw==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
}
public static string loadRsaPrivateKeyPem() {
return "<RSAKeyValue><Modulus>8EmWJUZ/Osz4vXtUU2S+0M4BP9+s423gjMjoX+qP1iCnlcRcFWxthQGN2CWSMZwR/vY9V0un/nsIxhZSWOH9iKzqUtZD4jt35jqOTeJ3PCSr48JirVDNLet7hRT37Ovfu5iieMN7ZNpkjeIG/CfT/QQl7R+kO/EnTmL3QjLKQNV/HhEbHS2/44x7PPoHqSqkOvl8GW0qtL39gTLWgAe801/w5PmcQ38CKG0oT2gdJmJqIxNmAEHkatYGHcMDtXRBpOhOSdraFj6SmPyHEmLBishaq7Jm8NPPNK9QcEQ3q+ERa5M6eM72PpF93g2p5cjKgyzzfoIV09Zb/LJ2aW2gQw==</Modulus><Exponent>AQAB</Exponent><P>/8atV5DmNxFrxF1PODDjdJPNb9pzNrDF03TiFBZWS4Q+2JazyLGjZzhg5Vv9RJ7VcIjPAbMy2Cy5BUffEFE+8ryKVWfdpPxpPYOwHCJSw4Bqqdj0Pmp/xw928ebrnUoCzdkUqYYpRWx0T7YVRoA9RiBfQiVHhuJBSDPYJPoP34k=</P><Q>8H9wLE5L8raUn4NYYRuUVMa+1k4Q1N3XBixm5cccc/Ja4LVvrnWqmFOmfFgpVd8BcTGaPSsqfA4j/oEQp7tmjZqggVFqiM2mJ2YEv18cY/5kiDUVYR7VWSkpqVOkgiX3lK3UkIngnVMGGFnoIBlfBFF9uo02rZpC5o5zebaDIms=</Q><DP>BPXecL9Pp6u/0kwY+DcCgkVHi67J4zqka4htxgP04nwLF/o8PF0tlRfj0S7qh4UpEIimsxq9lrGvWOne6psYxG5hpGxiQQvgIqBGLxV/U2lPKEIb4oYAOmUTYnefBCrmSQW3v93pOP50dwNKAFcGWTDRiB/e9j+3EmZm/7iVzDk=</DP><DQ>rBWkAC/uLDf01Ma5AJMpahfkCZhGdupdp68x2YzFkTmDSXLJ/P15GhIQ+Lxkp2swrvwdL1OpzKaZnsxfTIXNddmEq8PEBSuRjnNzRjQaLnqjGMtTBvF3G5tWkjClb/MW2q4fgWUG8cusetQqQn2k/YQKAOh2jXXqFOstOZQc9Q0=</DQ><InverseQ>BtiIiTnpBkd6hkqJnHLh6JxBLSxUopFvbhlR37Thw1JN94i65dmtgnjwluvR/OMgzcR8e8uCH2sBn5od78vzgiDXsqITF76rJgeO639ILTA4MO3Mz+O2umrJhrkmgSk8hpRKA+5Mf9aE7dwOzHrc8hbj8J102zyYJIE6pOehrGE=</InverseQ><D>hXGYfOMFzXX/vds8HYQZpISDlSF3NmbTCdyZkIsHjndcGoSOTyeEOxV93MggxIRUSjAeKNjPVzikyr2ixdHbp4fAKnjsAjvcfnOOjBp09WW4QCi3/GCfUh0w39uhRGZKPjiqIj8NzBitN06LaoYD6MPg/CtSXiezGIlFn/Hs+MuEzNFu8PFDj9DhOFhfCgQaIgEEr+IHdnl5HuUVrwTnIBrEzZA/08Q0Gv86qQZctZWoD9hPGzeAC+RSMyGVJw6Ls8zBFf0eysB4spsu4LUom/WnZMdS1ls4eqsAX+7AdqPKBRuUVpr8FNyRM3s8pJUiGns6KFsPThtJGuH6c6KVwQ==</D></RSAKeyValue>";
}
}
我正在开发一个 .net 标准（.net 标准 2.0）库。
我有一个 public 密钥，它是在服务器端创建的，我通过 api 调用收到了它。
现在我有一个要使用 RSA 算法加密的字符串。此外，我必须在加密我拥有的字符串时使用此 public 密钥。
我检查了各种样本，但没有任何帮助。
试过这个RSA public key encryption in C#
但出现错误“此平台不支持操作。” .
尝试了 this 一个，但找不到使用我从服务器收到的 public 密钥的方法。
这是我试过的最新代码。我不确定如何以及在何处使用我的 public 密钥字符串。
static public byte[] Encryption(byte[] Data, RSAParameters RSAKey, bool DoOAEPPadding)
{
try
{
byte[] encryptedData;
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
RSA.ImportParameters(RSAKey);
encryptedData = RSA.Encrypt(Data, DoOAEPPadding);
}
return encryptedData;
}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] Decryption(byte[] Data, RSAParameters RSAKey, bool DoOAEPPadding)
{
try
{
byte[] decryptedData;
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider())
{
RSA.ImportParameters(RSAKey);
decryptedData = RSA.Decrypt(Data, DoOAEPPadding);
}
return decryptedData;
}
catch (CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
在这里我可以看到RSAKey但是它不接受字符串输入。
任何人都可以指导我一些示例，通过这些示例我可以使用我拥有的 public 加密和解密简单的文本。
谢谢， 努鲁
下面是一个完整的工作代码，它使用 XML 中的 RSA public 密钥加密字符串，并使用 RSA 私钥解密密文（以及 XML编码）。密文以 base64 编码。这里给一个在线编译器link看代码运行：https://repl.it/@javacrypto/CpcCsharpRsaEncryptionOaepSha1String#main.cs
输出：
RSA 2048 encryption OAEP SHA-1 string
plaintext: The quick brown fox jumps over the lazy dog
* * * encrypt the plaintext with the RSA public key * * *
ciphertextBase64: lFZwBN5SnlqAKEYktjjTmDUyIAFA86CDIrOyPeRLVXLIManP6wTUgZ3NBSYynfgwXTmVzhPQL3wZ6kngWIgVbl1sMOSiTt6BOvop5HwEU6ejUOrhgDzuxSnA4e8txNG0X8NZ4kt1bzE42gHlbjxHG+CYawAVYECPMyZ4Jc/n7qH8McsUh3n/KUOB2h5R6DULjf2Qfl4aQHppbEeECNmpSFJFUSu3iGBI7hacHbb+1myyLteS1o3FiBuSVbG+L7h8DEokbhE5yVTwamFF+qM+/HTWeGfE+CGC6Kb8cAucP7Zoov6e+Gr7aFYMvhrWjTvApzMBu5XD0j3JzxQD9OmA8g==
* * * decrypt the ciphertext with the RSA private key * * *
ciphertextReceivedBase64: lFZwBN5SnlqAKEYktjjTmDUyIAFA86CDIrOyPeRLVXLIManP6wTUgZ3NBSYynfgwXTmVzhPQL3wZ6kngWIgVbl1sMOSiTt6BOvop5HwEU6ejUOrhgDzuxSnA4e8txNG0X8NZ4kt1bzE42gHlbjxHG+CYawAVYECPMyZ4Jc/n7qH8McsUh3n/KUOB2h5R6DULjf2Qfl4aQHppbEeECNmpSFJFUSu3iGBI7hacHbb+1myyLteS1o3FiBuSVbG+L7h8DEokbhE5yVTwamFF+qM+/HTWeGfE+CGC6Kb8cAucP7Zoov6e+Gr7aFYMvhrWjTvApzMBu5XD0j3JzxQD9OmA8g==
decryptedData: The quick brown fox jumps over the lazy dog
安全警告：代码使用硬编码RSA [示例]密钥仅用于演示。该代码没有异常处理，仅用于教育目的。
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
class RsaEncryptionOaepSha1 {
static void Main() {
Console.WriteLine("RSA 2048 encryption OAEP SHA-1 string");
string dataToEncryptString = "The quick brown fox jumps over the lazy dog";
Console.WriteLine("plaintext: " + dataToEncryptString);
// # # # usually we would load the private and public key from a file or keystore # # #
// # # # here we use hardcoded keys for demonstration - don't do this in real programs # # #
string filenamePrivateKeyXml = "privatekey2048.xml";
string filenamePublicKeyXml = "publickey2048.xml";
try {
// encryption
Console.WriteLine("\n* * * encrypt the plaintext with the RSA public key * * *");
//string publicKeyLoad = loadRsaPublicKeyPem();
// use this in production
string publicKeyLoad = File.ReadAllText(filenamePublicKeyXml);
byte[] dataToEncrypt = Encoding.UTF8.GetBytes(dataToEncryptString);
string ciphertextBase64 = Base64Encoding(rsaEncryptionOaepSha1(publicKeyLoad, dataToEncrypt));
//string ciphertextBase64 = "";
Console.WriteLine("ciphertextBase64: " + ciphertextBase64);
// transport the encrypted data to recipient
// receiving the encrypted data, decryption
Console.WriteLine("\n* * * decrypt the ciphertext with the RSA private key * * *");
string ciphertextReceivedBase64 = ciphertextBase64;
Console.WriteLine("ciphertextReceivedBase64: " + ciphertextReceivedBase64);
//string privateKeyLoad = loadRsaPrivateKeyPem();
// use this in production
string privateKeyLoad = File.ReadAllText(filenamePrivateKeyXml);
byte[] ciphertextReceived = Base64Decoding(ciphertextReceivedBase64);
byte[] decryptedtextByte = rsaDecryptionOaepSha1(privateKeyLoad, ciphertextReceived);
Console.WriteLine("decryptedData: " + Encoding.UTF8.GetString(decryptedtextByte, 0, decryptedtextByte.Length));
}
catch(ArgumentNullException) {
Console.WriteLine("The data was not RSA encrypted");
}
}
public static byte[] rsaEncryptionOaepSha1(string publicKeyXml, byte[] plaintext) {
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider(2048);
RSAalg.PersistKeyInCsp = false;
RSAalg.FromXmlString(publicKeyXml);
return RSAalg.Encrypt(plaintext, true);
}
public static byte[] rsaDecryptionOaepSha1(string privateKeyXml, byte[] ciphertext) {
RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider(2048);
RSAalg.PersistKeyInCsp = false;
RSAalg.FromXmlString(privateKeyXml);
return RSAalg.Decrypt(ciphertext, true);
}
static string Base64Encoding(byte[] input) {
return Convert.ToBase64String(input);
}
static byte[] Base64Decoding(String input) {
return Convert.FromBase64String(input);
}
public static string loadRsaPublicKeyPem() {
return "<RSAKeyValue><Modulus>8EmWJUZ/Osz4vXtUU2S+0M4BP9+s423gjMjoX+qP1iCnlcRcFWxthQGN2CWSMZwR/vY9V0un/nsIxhZSWOH9iKzqUtZD4jt35jqOTeJ3PCSr48JirVDNLet7hRT37Ovfu5iieMN7ZNpkjeIG/CfT/QQl7R+kO/EnTmL3QjLKQNV/HhEbHS2/44x7PPoHqSqkOvl8GW0qtL39gTLWgAe801/w5PmcQ38CKG0oT2gdJmJqIxNmAEHkatYGHcMDtXRBpOhOSdraFj6SmPyHEmLBishaq7Jm8NPPNK9QcEQ3q+ERa5M6eM72PpF93g2p5cjKgyzzfoIV09Zb/LJ2aW2gQw==</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
}
public static string loadRsaPrivateKeyPem() {
return "<RSAKeyValue><Modulus>8EmWJUZ/Osz4vXtUU2S+0M4BP9+s423gjMjoX+qP1iCnlcRcFWxthQGN2CWSMZwR/vY9V0un/nsIxhZSWOH9iKzqUtZD4jt35jqOTeJ3PCSr48JirVDNLet7hRT37Ovfu5iieMN7ZNpkjeIG/CfT/QQl7R+kO/EnTmL3QjLKQNV/HhEbHS2/44x7PPoHqSqkOvl8GW0qtL39gTLWgAe801/w5PmcQ38CKG0oT2gdJmJqIxNmAEHkatYGHcMDtXRBpOhOSdraFj6SmPyHEmLBishaq7Jm8NPPNK9QcEQ3q+ERa5M6eM72PpF93g2p5cjKgyzzfoIV09Zb/LJ2aW2gQw==</Modulus><Exponent>AQAB</Exponent><P>/8atV5DmNxFrxF1PODDjdJPNb9pzNrDF03TiFBZWS4Q+2JazyLGjZzhg5Vv9RJ7VcIjPAbMy2Cy5BUffEFE+8ryKVWfdpPxpPYOwHCJSw4Bqqdj0Pmp/xw928ebrnUoCzdkUqYYpRWx0T7YVRoA9RiBfQiVHhuJBSDPYJPoP34k=</P><Q>8H9wLE5L8raUn4NYYRuUVMa+1k4Q1N3XBixm5cccc/Ja4LVvrnWqmFOmfFgpVd8BcTGaPSsqfA4j/oEQp7tmjZqggVFqiM2mJ2YEv18cY/5kiDUVYR7VWSkpqVOkgiX3lK3UkIngnVMGGFnoIBlfBFF9uo02rZpC5o5zebaDIms=</Q><DP>BPXecL9Pp6u/0kwY+DcCgkVHi67J4zqka4htxgP04nwLF/o8PF0tlRfj0S7qh4UpEIimsxq9lrGvWOne6psYxG5hpGxiQQvgIqBGLxV/U2lPKEIb4oYAOmUTYnefBCrmSQW3v93pOP50dwNKAFcGWTDRiB/e9j+3EmZm/7iVzDk=</DP><DQ>rBWkAC/uLDf01Ma5AJMpahfkCZhGdupdp68x2YzFkTmDSXLJ/P15GhIQ+Lxkp2swrvwdL1OpzKaZnsxfTIXNddmEq8PEBSuRjnNzRjQaLnqjGMtTBvF3G5tWkjClb/MW2q4fgWUG8cusetQqQn2k/YQKAOh2jXXqFOstOZQc9Q0=</DQ><InverseQ>BtiIiTnpBkd6hkqJnHLh6JxBLSxUopFvbhlR37Thw1JN94i65dmtgnjwluvR/OMgzcR8e8uCH2sBn5od78vzgiDXsqITF76rJgeO639ILTA4MO3Mz+O2umrJhrkmgSk8hpRKA+5Mf9aE7dwOzHrc8hbj8J102zyYJIE6pOehrGE=</InverseQ><D>hXGYfOMFzXX/vds8HYQZpISDlSF3NmbTCdyZkIsHjndcGoSOTyeEOxV93MggxIRUSjAeKNjPVzikyr2ixdHbp4fAKnjsAjvcfnOOjBp09WW4QCi3/GCfUh0w39uhRGZKPjiqIj8NzBitN06LaoYD6MPg/CtSXiezGIlFn/Hs+MuEzNFu8PFDj9DhOFhfCgQaIgEEr+IHdnl5HuUVrwTnIBrEzZA/08Q0Gv86qQZctZWoD9hPGzeAC+RSMyGVJw6Ls8zBFf0eysB4spsu4LUom/WnZMdS1ls4eqsAX+7AdqPKBRuUVpr8FNyRM3s8pJUiGns6KFsPThtJGuH6c6KVwQ==</D></RSAKeyValue>";
}
}