如何从.NET导入RSA公钥到OpenSSL

I have a .NET program and a Borland Win32 program that need to pass some cryptographically secure information. The plan right now is to have the .NET app create a public/private key pair, store the public key on disk and keep the private key in memory for as long as the .NET program is running.

我有一个.NET程序和Borland Win32程序需要传递一些加密安全信息。现在的计划是让.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程序运行时将私钥保存在内存中。

The Borland app will then read the public key from disk and use the OpenSSL library to encrypt the data with the public key and write that result to disk.

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

Finally the .NET app will read the encrypted data and decrypt it with the private key.

最后,.NET应用程序将读取加密数据并使用私钥对其进行解密。

What is the best way to export the key from .NET and in turn import it into the OpenSSL library?

从.NET导出密钥并将其导入OpenSSL库的最佳方法是什么?

2 个解决方案

#1

In the .NET program create a new RSACryptoServiceProvider. Export the public key as RSAParameters and write the Modulus and Exponent values to disk. Like this:

在.NET程序中创建一个新的RSACryptoServiceProvider。将公钥导出为RSAParameters并将Modulus和Exponent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);

On the C++ side you'll need to read the modulus and exponent values from disk convert them into BIGNUM values. These values will be loaded into an RSA key and then you can encrypt the plain text and write the cipher text to disk. Like this:

在C ++方面,您需要从磁盘读取模数和指数值,将它们转换为BIGNUM值。这些值将加载到RSA密钥中,然后您可以加密纯文本并将密文写入磁盘。像这样:

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);

Finally you can take the ciphertext and decrypt it in C# without any difficulty.

最后你可以使用密文并在C#中解密它没有任何困难。

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

#2

You could use OpenSSL directly in C# with the OpenSSL.NET wrapper!

您可以使用OpenSSL.NET包装器直接在C#中使用OpenSSL!

#1