这几乎无法得到任何答案，但是还是让我们尝试一下。另外我可能只是做了一些非常基本的事情而已...但是无论如何:
我必须使用一些OpenSSL函数通过PHP对AES/RSA进行加密/解密(只是告诉您，以便您知道一些省时的方法，就可以知道...)。由于OpenSSL.NET首先无法与Mono配合使用，其次它不再获得支持，因此我不得不将我需要的功能直接从C OpenSSL移植到DLL，然后从C#调用这些功能，痛苦本身。
您可能会注意到，加密/解密功能是直接从the wiki.中盗取的AHEM
.h文件是:
#pragma once
#include <comdef.h>
#include <comutil.h>
#include <tchar.h>
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/applink.c>
#define EXPORT __declspec(dllexport)
namespace OpenSSL
{
extern "C" { EXPORT int NumericTest(int a, int b); }
extern "C" { EXPORT BSTR StringTest(); }
extern "C" { EXPORT BSTR StringTestReturn(char *toReturn); }
extern "C" { EXPORT int Encrypt_AES_256_CBC(unsigned char *plaintext,
int plaintext_len,
unsigned char *key,
unsigned char *iv,
unsigned char *ciphertext); }
extern "C" { EXPORT int Decrypt_AES_256_CBC(unsigned char *ciphertext,
int ciphertext_len,
unsigned char *key,
unsigned char *iv,
unsigned char *plaintext); }
extern "C" { EXPORT void HandleErrors(); }
}
.cpp文件是:
#include "OpenSSL.h"
namespace OpenSSL
{
void HandleErrors()
{
ERR_print_errors_fp(stderr);
abort();
}
void InitOpenSSL()
{
ERR_load_crypto_strings();
OpenSSL_add_all_algorithms();
OPENSSL_config(NULL);
}
int NumericTest(int a, int b)
{
return a + b;
}
BSTR StringTest()
{
return ::SysAllocString(L"StringTest successful!");
}
BSTR StringTestReturn(char *toReturn)
{
_bstr_t bstrt(toReturn);
bstrt += " (StringTestReturn)";
strcpy_s(toReturn, 256, "StringTestReturn");
return bstrt;
}
int Encrypt_AES_256_CBC(unsigned char *plaintext, int plaintext_len, unsigned char *key, unsigned char *iv, unsigned char *ciphertext)
{
InitOpenSSL();
EVP_CIPHER_CTX *ctx;
int len;
int ciphertext_len;
/* Create and initialise the context */
if (!(ctx = EVP_CIPHER_CTX_new())) HandleErrors();
/* Initialise the encryption operation. IMPORTANT - ensure you use a key
* and IV size appropriate for your cipher
* In this example we are using 256 bit AES (i.e. a 256 bit key). The
* IV size for *most* modes is the same as the block size. For AES this
* is 128 bits */
if (1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv))
HandleErrors();
/* Provide the message to be encrypted, and obtain the encrypted output.
* EVP_EncryptUpdate can be called multiple times if necessary
*/
if (1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
HandleErrors();
ciphertext_len = len;
/* Finalise the encryption. Further ciphertext bytes may be written at
* this stage.
*/
if (1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len)) HandleErrors();
ciphertext_len += len;
/* Clean up */
EVP_CIPHER_CTX_free(ctx);
return ciphertext_len;
}
int Decrypt_AES_256_CBC(unsigned char *ciphertext, int ciphertext_len, unsigned char *key,
unsigned char *iv, unsigned char *plaintext)
{
InitOpenSSL();
EVP_CIPHER_CTX *ctx;
int len;
int plaintext_len;
/* Create and initialise the context */
if (!(ctx = EVP_CIPHER_CTX_new())) HandleErrors();
/* Initialise the decryption operation. IMPORTANT - ensure you use a key
* and IV size appropriate for your cipher
* In this example we are using 256 bit AES (i.e. a 256 bit key). The
* IV size for *most* modes is the same as the block size. For AES this
* is 128 bits */
if (1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv))
HandleErrors();
/* Provide the message to be decrypted, and obtain the plaintext output.
* EVP_DecryptUpdate can be called multiple times if necessary
*/
if (1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
HandleErrors();
plaintext_len = len;
/* Finalise the decryption. Further plaintext bytes may be written at
* this stage.
*/
if (1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len)) HandleErrors();
plaintext_len += len;
/* Clean up */
EVP_CIPHER_CTX_free(ctx);
return plaintext_len;
}
}
请注意，这些功能如何经过测试并在C++控制台应用程序上完美运行
最后但并非最不重要的一点是，我一直用于测试目的的C#代码:
using System;
using System.Text;
using System.Runtime.InteropServices;
namespace OpenSSLTests
{
[StructLayout(LayoutKind.Sequential)]
class OpenSSL
{
const string OPENSSL_PATH = "(here i putted my dll file path (of course in the program i putted the real path, but not here))";
[DllImport(OPENSSL_PATH, CallingConvention = CallingConvention.Cdecl)]
public static extern int NumericTest(int a, int b);
[DllImport(OPENSSL_PATH, CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.BStr)]
public static extern string StringTest();
[DllImport(OPENSSL_PATH, EntryPoint = "StringTestReturn", CallingConvention = CallingConvention.Cdecl)]
[return: MarshalAs(UnmanagedType.BStr)]
public static extern string StringTestReturn(StringBuilder toReturn);
[DllImport(OPENSSL_PATH, CallingConvention = CallingConvention.Cdecl)]
public static extern int Encrypt_AES_256_CBC(StringBuilder plainText,
int plaintext_len,
StringBuilder key,
StringBuilder iv,
StringBuilder ciphertext);
[DllImport(OPENSSL_PATH, CallingConvention = CallingConvention.Cdecl)]
public static extern int Decrypt_AES_256_CBC(StringBuilder cipherText,
int ciphertext_len,
StringBuilder key,
StringBuilder iv,
StringBuilder plaintext);
static void Main(string[] args)
{
Console.WriteLine("the numeric test result is: " + NumericTest(1, 2));
Console.WriteLine();
Console.WriteLine("the string test result is: " + StringTest());
Console.WriteLine();
StringBuilder test = new StringBuilder(256);
test.Append("test");
Console.WriteLine("test is: " + test);
Console.WriteLine();
Console.WriteLine("Calling StringTestReturn...");
string newTest = StringTestReturn(test);
Console.WriteLine("test is now: " + test);
Console.WriteLine("newTest is: " + newTest);
Console.WriteLine();
StringBuilder plainText = new StringBuilder(1024);
plainText.Append("this is a really crashy test plz halp");
StringBuilder key = new StringBuilder(1024);
StringBuilder IV = new StringBuilder(1024);
key.Append("randomkey12345asdafsEWFAWEFAERGERUGHERUIGHAEIRUGHOAEGHSD");
IV.Append("ivtoUse1248235fdghapeorughèaerjèaeribyvgnèaervgjer0vriono");
StringBuilder ciphredText = new StringBuilder(1024);
int plainTextLength = Encrypt_AES_256_CBC(plainText, plainText.Length, key, IV, ciphredText);
if (plainTextLength != -1)
{
Console.WriteLine("encrypted text length: " + plainTextLength);
Console.WriteLine("the encrypted text content is: " + ciphredText);
}
else
{
Console.WriteLine("error encrypting\n");
}
StringBuilder decryptedText = new StringBuilder(1024);
int decryptedTextLength = -1;
try
{
decryptedTextLength = Decrypt_AES_256_CBC(ciphredText, ciphredText.Length, key, IV, decryptedText);
}
catch (Exception e)
{
Console.WriteLine("error during decryption");
}
if (decryptedTextLength != -1)
{
decryptedText[decryptedTextLength] = '\0';
Console.WriteLine("decrypted text length: " + decryptedTextLength);
try
{
//here it crashes without even giving you the courtesy of printing anything. It just closes
Console.WriteLine("decrypted text is: " + decryptedText);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
else
{
Console.WriteLine("error after decryption");
}
Console.ReadLine();
}
}
}
如您所料，它不起作用。 不完全是。或更好:它不起作用，但奇怪的是它不起作用:与我曾经写过或听过的任何其他程序不同，当该程序运行Visual Studio时，它只是打开一个控制台窗口，而只是打开一个窗口，然后它就自动关闭甚至不抛出错误。您知道吗，就像当您学习C#并编写Hello World一样，但是忘记在最后添加Console.ReadLine()或在c++中添加system(“PAUSE”)时，它会在一秒钟内关闭吗？同样的事情。
但是，如果我通过按ctrl + F5来运行它，则会得到控制台，输出将是:
the numeric test result is: 3
the string test result is: StringTest successful!
test is: test
Calling StringTestReturn...
test is now: StringTestReturn
newTest is: test (StringTestReturn)
encrypted text length: 48
the encrypted text content is: 9ïÅèSðdC1¦æÌ?
OPENSSL_Uplink(00007FFFFB388000,08): no OPENSSL_Applink
Premere un tasto per continuare . . . (press a key to finish in italian)
因此，错误应该是OPENSSL_Uplink(00007FFFFB388000,08):没有OPENSSL_Applink并在我尝试编写解密文本时将其抛出。
根据documentation of the website的说法，如果您忘记在代码中包含applink.c，就会发生这种情况，但是正如您所看到的，它就位于.h文件中。
那我该如何摆脱呢？包含applink.c无效。
如果您能让我摆脱这个永恒的 hell ，我会把我的灵魂卖给您。
问候。
最佳答案
只需将applink.c包含在main.c中，不要将其包含在任何其他文件中!