C# 如何将RSA公钥从.NET导入OpenSSL

我有一个.NET程序和一个Borland Win32程序，需要传递一些加密安全信息。目前的计划是让.NET应用程序创建一个公钥/私钥对，将公钥存储在磁盘上，并在.NET程序运行期间将私钥保留在内存中

Borland应用程序将从磁盘读取公钥，并使用OpenSSL库用公钥加密数据，然后将结果写入磁盘

最后，.NET应用程序将读取加密数据并使用私钥对其解密

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从.NET导出密钥并将其导入OpenSSL库的最佳方法是什么？

在.NET程序中创建一个新的

RSACryptServiceProvider

。将公钥导出为

rsapameters

，并将

模数

和

指数

值写入磁盘。像这样：

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(4096); //4096 bit key
RSAParameters par = rsa.ExportParameters(false); // export the public key

File.WriteAllBytes(@"C:\modulus.bin", par.Modulus); // write the modulus and the exponent to disk
File.WriteAllBytes(@"C:\exponent.bin", par.Exponent);

RSA * key;

unsigned char *modulus; 
unsigned char *exp; 

FILE * fp = fopen("c:\\modulus.bin", "rb"); // Read the modulus from disk
modulus = new unsigned char[512];
memset(modulus, 0, 512);
fread(modulus, 512, 1, fp);
fclose(fp);

fp = fopen("c:\\exponent.bin", "rb"); // Read the exponent from disk
exp = new unsigned char[3];
memset(exp, 0, 3);
fread(exp, 3, 1, fp);
fclose(fp);

BIGNUM * bn_mod = NULL;
BIGNUM * bn_exp = NULL;

bn_mod = BN_bin2bn(modulus, 512, NULL); // Convert both values to BIGNUM
bn_exp = BN_bin2bn(exp, 3, NULL);

key = RSA_new(); // Create a new RSA key
key->n = bn_mod; // Assign in the values
key->e = bn_exp;
key->d = NULL;
key->p = NULL;
key->q = NULL;

int maxSize = RSA_size(key); // Find the length of the cipher text

cipher = new char[valid];
memset(cipher, 0, valid);
RSA_public_encrypt(strlen(plain), plain, cipher, key, RSA_PKCS1_PADDING); // Encrypt plaintext

fp = fopen("C:\\cipher.bin", "wb"); // write ciphertext to disk
fwrite(cipher, 512, 1, fp);
fclose(fp);

在C++侧，你需要读取磁盘的模数和指数值，将它们转换成<代码> Biguni值。这些值将被加载到RSA密钥中，然后您可以加密纯文本并将密码文本写入磁盘。像这样：

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(4096); //4096 bit key
RSAParameters par = rsa.ExportParameters(false); // export the public key

File.WriteAllBytes(@"C:\modulus.bin", par.Modulus); // write the modulus and the exponent to disk
File.WriteAllBytes(@"C:\exponent.bin", par.Exponent);

RSA * key;

unsigned char *modulus; 
unsigned char *exp; 

FILE * fp = fopen("c:\\modulus.bin", "rb"); // Read the modulus from disk
modulus = new unsigned char[512];
memset(modulus, 0, 512);
fread(modulus, 512, 1, fp);
fclose(fp);

fp = fopen("c:\\exponent.bin", "rb"); // Read the exponent from disk
exp = new unsigned char[3];
memset(exp, 0, 3);
fread(exp, 3, 1, fp);
fclose(fp);

BIGNUM * bn_mod = NULL;
BIGNUM * bn_exp = NULL;

bn_mod = BN_bin2bn(modulus, 512, NULL); // Convert both values to BIGNUM
bn_exp = BN_bin2bn(exp, 3, NULL);

key = RSA_new(); // Create a new RSA key
key->n = bn_mod; // Assign in the values
key->e = bn_exp;
key->d = NULL;
key->p = NULL;
key->q = NULL;

int maxSize = RSA_size(key); // Find the length of the cipher text

cipher = new char[valid];
memset(cipher, 0, valid);
RSA_public_encrypt(strlen(plain), plain, cipher, key, RSA_PKCS1_PADDING); // Encrypt plaintext

fp = fopen("C:\\cipher.bin", "wb"); // write ciphertext to disk
fwrite(cipher, 512, 1, fp);
fclose(fp);

最后，你可以毫不费力地把密文用C#解密

byte[] cipher = File.ReadAllBytes(@"c:\cipher.bin"); // Read ciphertext from file
byte[] plain = rsa.Decrypt(cipher, false); // Decrypt ciphertext

Console.WriteLine(ASCIIEncoding.ASCII.GetString(plain)); // Decode and display plain text

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您可以直接在C#中使用带有包装器的OpenSSL

这是一个伟大的项目，我已经在一两个项目中使用过它。我很高兴看到开发人员自从上次检查以来更新了V1.0.0D：（嗨），如何用私钥对C++进行解密？非常感谢。