AusweisApp2
ASN1TemplateUtil.h
gehe zur Dokumentation dieser Datei
1 
7 #pragma once
8 
9 #include <openssl/asn1t.h>
10 #include <openssl/err.h>
11 
12 #include <QByteArray>
13 #include <QLoggingCategory>
14 #include <QScopeGuard>
15 #include <QSharedPointer>
16 
17 Q_DECLARE_LOGGING_CATEGORY(card)
18 
19 namespace governikus
20 {
21 
22 QByteArray getOpenSslError();
23 
27 template<typename T>
29 {
30  static_assert(std::is_void_v<T>, "Implement specialization of newAsn1Object");
31  return 0;
32 }
33 
34 
38 template<typename T>
39 QSharedPointer<T> newObject(T* pObject = newAsn1Object<T>())
40 {
41  static auto deleter = [](T* pObjectToDelete)
42  {
43  freeAsn1Object(pObjectToDelete);
44  };
45  return QSharedPointer<T>(pObject, deleter);
46 }
47 
48 
52 template<typename T>
53 int encodeAsn1Object(T*, uchar**)
54 {
55  static_assert(std::is_void_v<T>, "Implement specialization of encodeObject");
56  return 0;
57 }
58 
59 
63 template<typename T>
64 QByteArray encodeObject(T* pObject)
65 {
66  if (!pObject)
67  {
68  return QByteArray();
69  }
70 
71  ERR_clear_error();
72  uchar* encoded = nullptr;
73  const int length = encodeAsn1Object(pObject, &encoded);
74  const auto guard = qScopeGuard([encoded] {
75  OPENSSL_free(encoded);
76  });
77  if (length < 0)
78  {
79  qCWarning(card) << "Cannot encode ASN.1 object:" << getOpenSslError();
80  return QByteArray();
81  }
82 
83  return QByteArray(reinterpret_cast<char*>(encoded), length);
84 }
85 
86 
90 template<typename T>
91 T* decodeAsn1Object(T**, const uchar**, long)
92 {
93  static_assert(std::is_void_v<T>, "Implement specialization of decodeObject");
94  return 0;
95 }
96 
97 
101 template<typename T>
103 {
104  static_assert(std::is_void_v<T>, "Implement specialization of freeObject");
105 }
106 
107 
111 template<typename T>
112 QSharedPointer<T> decodeObject(const QByteArray& pData, bool pLogging = true)
113 {
114  ERR_clear_error();
115  const char* tmp = pData.constData();
116  const auto** dataPointer = reinterpret_cast<unsigned const char**>(&tmp);
117 
118  T* object = nullptr;
119  if (!decodeAsn1Object(&object, dataPointer, pData.length()) && pLogging)
120  {
121  qCWarning(card) << "Cannot decode ASN.1 object:" << getOpenSslError();
122  }
123 
124  static auto deleter = [](T* pTypeObject)
125  {
126  freeAsn1Object(pTypeObject);
127  };
128  return QSharedPointer<T>(object, deleter);
129 }
130 
131 
135 static const int CB_SUCCESS = 1;
136 
137 
141 static const int CB_ERROR = 0;
142 
143 
144 #define IMPLEMENT_ASN1_OBJECT(name)\
145  template<>\
146  name * newAsn1Object<name>()\
147  {\
148  return name##_new();\
149  }\
150 \
151  template<>\
152  int encodeAsn1Object<name>(name * pObject, uchar** encoded)\
153  {\
154  return i2d_##name(pObject, encoded);\
155  }\
156 \
157  template<>\
158  name * decodeAsn1Object<name>(name** pObject, const uchar** pData, long pDataLen)\
159  {\
160  return d2i_##name(pObject, pData, pDataLen);\
161  }\
162 \
163  template<>\
164  void freeAsn1Object<name>(name * pObject)\
165  {\
166  name##_free(pObject);\
167  }
168 
169 #define DECLARE_ASN1_OBJECT(name)\
170  template<> name * newAsn1Object<name>();\
171  template<> int encodeAsn1Object<name>(name * pObject, uchar** encoded);\
172  template<> name * decodeAsn1Object<name>(name** pObject, const uchar** pData, long pDataLen);\
173  template<> void freeAsn1Object<name>(name * pObject);
174 
175 
176 } // namespace governikus
#define T(v)
Definition: http_parser.cpp:237
A simple template renderer.
Definition: ActivationContext.h:15
int encodeAsn1Object(T *, uchar **)
Default template function for encoding an OpenSSL type.
Definition: ASN1TemplateUtil.h:53
QSharedPointer< T > decodeObject(const QByteArray &pData, bool pLogging=true)
Template function for decoding an OpenSSL type from DER encoded QByteArray.
Definition: ASN1TemplateUtil.h:112
T * newAsn1Object()
Default template function for creating an OpenSSL type.
Definition: ASN1TemplateUtil.h:28
QByteArray getOpenSslError()
Definition: ASN1TemplateUtil.cpp:7
QByteArray encodeObject(T *pObject)
Template function for encoding an OpenSSL type as DER encoded QByteArray.
Definition: ASN1TemplateUtil.h:64
QSharedPointer< T > newObject(T *pObject=newAsn1Object< T >())
Template function for creating a SharedPointer holding an ASN.1 OpenSSL type.
Definition: ASN1TemplateUtil.h:39
T * decodeAsn1Object(T **, const uchar **, long)
Default template function for decoding an OpenSSL type.
Definition: ASN1TemplateUtil.h:91
void freeAsn1Object(T *)
Default template function for freeing an OpenSSL type.
Definition: ASN1TemplateUtil.h:102