crypt32: Improve undocumented functions.

- Test and implement I_CryptGetDefaultCryptProv (and correct its
  parameter list)
- I_CryptReadTrustedPublisherDWORDValueFromRegistry always initializes
  its out parameter, correct and show with a test.

dlls/crypt32/crypt32.spec

@@ -186,7 +186,7 @@
 @ stdcall I_CryptFlushLruCache(ptr long long)
 @ stdcall I_CryptFreeLruCache(ptr long long)
 @ stdcall I_CryptFreeTls(long long)
-@ stdcall I_CryptGetDefaultCryptProv(long long long)
+@ stdcall I_CryptGetDefaultCryptProv(long)
 @ stub I_CryptGetDefaultCryptProvForEncrypt
 @ stdcall I_CryptGetOssGlobal(long)
 @ stdcall I_CryptGetTls(long)

dlls/crypt32/main.c

@@ -271,10 +271,20 @@ BOOL WINAPI I_CryptGetOssGlobal(DWORD x)
     return FALSE;
 }
 
-BOOL WINAPI I_CryptGetDefaultCryptProv(DWORD x, DWORD y, DWORD z)
+HCRYPTPROV WINAPI I_CryptGetDefaultCryptProv(DWORD reserved)
 {
-    FIXME("%08lx %08lx %08lx\n", x, y, z);
-    return FALSE;
+    HCRYPTPROV ret;
+
+    TRACE("(%08lx)\n", reserved);
+
+    if (reserved)
+    {
+        SetLastError(E_INVALIDARG);
+        return (HCRYPTPROV)0;
+    }
+    ret = CRYPT_GetDefaultProvider();
+    CryptContextAddRef(ret, NULL, 0);
+    return ret;
 }
 
 BOOL WINAPI I_CryptReadTrustedPublisherDWORDValueFromRegistry(LPCWSTR name,
@@ -292,6 +302,7 @@ BOOL WINAPI I_CryptReadTrustedPublisherDWORDValueFromRegistry(LPCWSTR name,
 
     TRACE("(%s, %p)\n", debugstr_w(name), value);
 
+    *value = 0;
     rc = RegCreateKeyW(HKEY_LOCAL_MACHINE, safer, &key);
     if (rc == ERROR_SUCCESS)
     {

dlls/crypt32/tests/main.c

@@ -295,7 +295,7 @@ static void test_readTrustedPublisherDWORD(void)
         static const WCHAR authenticodeFlags[] = { 'A','u','t','h','e','n',
          't','i','c','o','d','e','F','l','a','g','s',0 };
         BOOL ret, exists = FALSE;
-        DWORD size, readFlags, returnedFlags;
+        DWORD size, readFlags = 0, returnedFlags;
         HKEY key;
         LONG rc;
 
@@ -308,14 +308,41 @@ static void test_readTrustedPublisherDWORD(void)
             if (rc == ERROR_SUCCESS)
                 exists = TRUE;
         }
+        returnedFlags = 0xdeadbeef;
         ret = pReadDWORD(authenticodeFlags, &returnedFlags);
         ok(ret == exists, "Unexpected return value\n");
-        if (exists)
         ok(readFlags == returnedFlags,
          "Expected flags %08lx, got %08lx\n", readFlags, returnedFlags);
     }
 }
 
+typedef HCRYPTPROV (WINAPI *I_CryptGetDefaultCryptProvFunc)(DWORD w);
+
+static void test_getDefaultCryptProv(void)
+{
+    I_CryptGetDefaultCryptProvFunc pI_CryptGetDefaultCryptProv;
+    HCRYPTPROV prov;
+
+    if (!hCrypt) return;
+
+    pI_CryptGetDefaultCryptProv = (I_CryptGetDefaultCryptProvFunc)
+     GetProcAddress(hCrypt, "I_CryptGetDefaultCryptProv");
+    if (!pI_CryptGetDefaultCryptProv) return;
+
+    prov = pI_CryptGetDefaultCryptProv(0xdeadbeef);
+    ok(prov == 0 && GetLastError() == E_INVALIDARG,
+     "Expected E_INVALIDARG, got %08lx\n", GetLastError());
+    prov = pI_CryptGetDefaultCryptProv(PROV_RSA_FULL);
+    ok(prov == 0 && GetLastError() == E_INVALIDARG,
+     "Expected E_INVALIDARG, got %08lx\n", GetLastError());
+    prov = pI_CryptGetDefaultCryptProv(1);
+    ok(prov == 0 && GetLastError() == E_INVALIDARG,
+     "Expected E_INVALIDARG, got %08lx\n", GetLastError());
+    prov = pI_CryptGetDefaultCryptProv(0);
+    ok(prov != 0, "I_CryptGetDefaultCryptProv failed: %08lx\n", GetLastError());
+    CryptReleaseContext(prov, 0);
+}
+
 START_TEST(main)
 {
     hCrypt = LoadLibraryA("crypt32.dll");
@@ -326,4 +353,5 @@ START_TEST(main)
     test_cryptAllocate();
     test_cryptTls();
     test_readTrustedPublisherDWORD();
+    test_getDefaultCryptProv();
 }