crypt32: Implement getting content of a data message.

dlls/crypt32/msg.c

@@ -743,6 +743,13 @@ static BOOL CDecodeMsg_GetParam(HCRYPTMSG hCryptMsg, DWORD dwParamType,
         ret = CRYPT_CopyParam(pvData, pcbData, (const BYTE *)&msg->type,
          sizeof(msg->type));
         break;
+    case CMSG_CONTENT_PARAM:
+        if (msg->data)
+            ret = CRYPT_CopyParam(pvData, pcbData, msg->data->pbData,
+             msg->data->cbData);
+        else
+            SetLastError(CRYPT_E_INVALID_MSG_TYPE);
+        break;
     default:
         FIXME("unimplemented for parameter %d\n", dwParamType);
         SetLastError(CRYPT_E_INVALID_MSG_TYPE);

dlls/crypt32/tests/msg.c

@@ -1208,10 +1208,14 @@ static void test_decode_msg_get_param(void)
 {
     HCRYPTMSG msg;
     BOOL ret;
+    DWORD size = 0;
 
     msg = CryptMsgOpenToDecode(PKCS_7_ASN_ENCODING, 0, 0, 0, NULL, NULL);
+    SetLastError(0xdeadbeef);
+    ret = CryptMsgGetParam(msg, CMSG_CONTENT_PARAM, 0, NULL, &size);
+    ok(!ret && GetLastError() == CRYPT_E_INVALID_MSG_TYPE,
+     "Expected CRYPT_E_INVALID_MSG_TYPE, got %x\n", GetLastError());
     ret = CryptMsgUpdate(msg, dataContent, sizeof(dataContent), TRUE);
-    todo_wine
     check_param("data content", msg, CMSG_CONTENT_PARAM, msgData,
      sizeof(msgData));
     CryptMsgClose(msg);