Make rsaenh_crosstest.exe loadable on NT 4.0.

dlls/rsaenh/tests/rsaenh.c

@@ -31,6 +31,8 @@ static const char szContainer[] = "winetest";
 static const unsigned char pbData[] = "Wine rocks totally!";
 static const char szProvider[] = MS_ENHANCED_PROV_A;
 
+static BOOL (WINAPI *pCryptDuplicateHash) (HCRYPTHASH, DWORD*, DWORD, HCRYPTHASH*);
+
 /*
 static void trace_hex(BYTE *pbData, DWORD dwLen) {
     char szTemp[256];
@@ -54,6 +56,8 @@ static int init_environment(void)
     HCRYPTKEY hKey;
     BOOL result;
         
+    pCryptDuplicateHash = (void *)GetProcAddress(GetModuleHandleA("advapi32.dll"), "CryptDuplicateHash");
+        
     hProv = (HCRYPTPROV)INVALID_HANDLE_VALUE;
 
     result = CryptAcquireContext(&hProv, szContainer, szProvider, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
@@ -246,7 +250,8 @@ static void test_hashes(void)
     result = CryptHashData(hHash, (BYTE*)pbData, 5, 0);
     ok(result, "%08lx\n", GetLastError());
 
-    result = CryptDuplicateHash(hHash, 0, 0, &hHashClone);
+    if(pCryptDuplicateHash) {
+        result = pCryptDuplicateHash(hHash, 0, 0, &hHashClone);
         ok(result, "%08lx\n", GetLastError());
 
         result = CryptHashData(hHashClone, (BYTE*)pbData+5, sizeof(pbData)-5, 0);
@@ -264,6 +269,7 @@ static void test_hashes(void)
 
         result = CryptDestroyHash(hHashClone);
         ok(result, "%08lx\n", GetLastError());
+    }
 
     result = CryptDestroyHash(hHash);
     ok(result, "%08lx\n", GetLastError());