16091978769

Committed 05 Jul 2025 08:56PM UTC coverage: 90.571% (+0.001%) from 90.57%

Build # 16091978769

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Pull #4959

github

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web-flow

Commit Message

Merge 4fb822b02 into c4f937d19

Pull Request Pull Request #4959: Enable and fix clang-tidy warning cppcoreguidelines-init-variables

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95.82

/src/lib/asn1/ber_dec.cpp

/*
* BER Decoder
* (C) 1999-2008,2015,2017,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/ber_dec.h>

#include <botan/bigint.h>
#include <botan/internal/int_utils.h>
#include <botan/internal/loadstor.h>
#include <memory>

namespace Botan {

namespace {

/*
* This value is somewhat arbitrary. OpenSSL allows up to 128 nested
* indefinite length sequences. If you increase this, also increase the
* limit in the test in test_asn1.cpp
*/
const size_t ALLOWED_EOC_NESTINGS = 16;

/*
* BER decode an ASN.1 type tag
*/
size_t decode_tag(DataSource* ber, ASN1_Type& type_tag, ASN1_Class& class_tag) {
   auto b = ber->read_byte();

   if(!b) {
      type_tag = ASN1_Type::NoObject;
      class_tag = ASN1_Class::NoObject;
      return 0;
   }

   if((*b & 0x1F) != 0x1F) {
      type_tag = ASN1_Type(*b & 0x1F);
      class_tag = ASN1_Class(*b & 0xE0);
      return 1;
   }

   size_t tag_bytes = 1;
   class_tag = ASN1_Class(*b & 0xE0);

   size_t tag_buf = 0;
   while(true) {
      b = ber->read_byte();
      if(!b) {
         throw BER_Decoding_Error("Long-form tag truncated");
      }
      if((tag_buf >> 24) != 0) {
         throw BER_Decoding_Error("Long-form tag overflowed 32 bits");
      }
      // This is required even by BER (see X.690 section 8.1.2.4.2 sentence c)
      if(tag_bytes == 0 && b == 0x80) {
         throw BER_Decoding_Error("Long form tag with leading zero");
      }
      ++tag_bytes;
      tag_buf = (tag_buf << 7) | (*b & 0x7F);
      if((*b & 0x80) == 0) {
         break;
      }
   }
   type_tag = ASN1_Type(tag_buf);
   return tag_bytes;
}

/*
* Find the EOC marker
*/
size_t find_eoc(DataSource* src, size_t allow_indef);

/*
* BER decode an ASN.1 length field
*/
size_t decode_length(DataSource* ber, size_t& field_size, size_t allow_indef) {
   uint8_t b = 0;
   if(ber->read_byte(b) == 0) {
      throw BER_Decoding_Error("Length field not found");
   }
   field_size = 1;
   if((b & 0x80) == 0) {
      return b;
   }

   field_size += (b & 0x7F);
   if(field_size > 5) {
      throw BER_Decoding_Error("Length field is too large");
   }

   if(field_size == 1) {
      if(allow_indef == 0) {
         throw BER_Decoding_Error("Nested EOC markers too deep, rejecting to avoid stack exhaustion");
      } else {
         return find_eoc(ber, allow_indef - 1);
      }
   }

   size_t length = 0;

   for(size_t i = 0; i != field_size - 1; ++i) {
      if(get_byte<0>(length) != 0) {
         throw BER_Decoding_Error("Field length overflow");
      }
      if(ber->read_byte(b) == 0) {
         throw BER_Decoding_Error("Corrupted length field");
      }
      length = (length << 8) | b;
   }
   return length;
}

/*
* Find the EOC marker
*/
size_t find_eoc(DataSource* ber, size_t allow_indef) {
   secure_vector<uint8_t> buffer(DefaultBufferSize), data;

   while(true) {
      const size_t got = ber->peek(buffer.data(), buffer.size(), data.size());
      if(got == 0) {
         break;
      }

      data += std::make_pair(buffer.data(), got);
   }

   DataSource_Memory source(data);
   data.clear();

   size_t length = 0;
   while(true) {
      ASN1_Type type_tag = ASN1_Type::NoObject;
      ASN1_Class class_tag = ASN1_Class::NoObject;
      const size_t tag_size = decode_tag(&source, type_tag, class_tag);
      if(type_tag == ASN1_Type::NoObject) {
         break;
      }

      size_t length_size = 0;
      const size_t item_size = decode_length(&source, length_size, allow_indef);
      source.discard_next(item_size);

      if(auto new_len = checked_add(length, item_size, tag_size, length_size)) {
         length = new_len.value();
      } else {
         throw Decoding_Error("Integer overflow while decoding DER");
      }

      if(type_tag == ASN1_Type::Eoc && class_tag == ASN1_Class::Universal) {
         break;
      }
   }
   return length;
}

class DataSource_BERObject final : public DataSource {
   public:
      size_t read(uint8_t out[], size_t length) override {
         BOTAN_ASSERT_NOMSG(m_offset <= m_obj.length());
         const size_t got = std::min<size_t>(m_obj.length() - m_offset, length);
         copy_mem(out, m_obj.bits() + m_offset, got);
         m_offset += got;
         return got;
      }

      size_t peek(uint8_t out[], size_t length, size_t peek_offset) const override {
         BOTAN_ASSERT_NOMSG(m_offset <= m_obj.length());
         const size_t bytes_left = m_obj.length() - m_offset;

         if(peek_offset >= bytes_left) {
            return 0;
         }

         const size_t got = std::min(bytes_left - peek_offset, length);
         copy_mem(out, m_obj.bits() + m_offset + peek_offset, got);
         return got;
      }

      bool check_available(size_t n) override {
         BOTAN_ASSERT_NOMSG(m_offset <= m_obj.length());
         return (n <= (m_obj.length() - m_offset));
      }

      bool end_of_data() const override { return get_bytes_read() == m_obj.length(); }

      size_t get_bytes_read() const override { return m_offset; }

      explicit DataSource_BERObject(BER_Object&& obj) : m_obj(std::move(obj)) {}

   private:
      BER_Object m_obj;
      size_t m_offset = 0;
};

}  // namespace

/*
* Check if more objects are there
*/
bool BER_Decoder::more_items() const {
   if(m_source->end_of_data() && !m_pushed.is_set()) {
      return false;
   }
   return true;
}

/*
* Verify that no bytes remain in the source
*/
BER_Decoder& BER_Decoder::verify_end() {
   return verify_end("BER_Decoder::verify_end called, but data remains");
}

/*
* Verify that no bytes remain in the source
*/
BER_Decoder& BER_Decoder::verify_end(std::string_view err) {
   if(!m_source->end_of_data() || m_pushed.is_set()) {
      throw Decoding_Error(err);
   }
   return (*this);
}

/*
* Discard all the bytes remaining in the source
*/
BER_Decoder& BER_Decoder::discard_remaining() {
   uint8_t buf = 0;
   while(m_source->read_byte(buf) != 0) {}
   return (*this);
}

const BER_Object& BER_Decoder::peek_next_object() {
   if(!m_pushed.is_set()) {
      m_pushed = get_next_object();
   }

   return m_pushed;
}

/*
* Return the BER encoding of the next object
*/
BER_Object BER_Decoder::get_next_object() {
   BER_Object next;

   if(m_pushed.is_set()) {
      std::swap(next, m_pushed);
      return next;
   }

   for(;;) {
      ASN1_Type type_tag = ASN1_Type::NoObject;
      ASN1_Class class_tag = ASN1_Class::NoObject;
      decode_tag(m_source, type_tag, class_tag);
      next.set_tagging(type_tag, class_tag);
      if(next.is_set() == false) {  // no more objects
         return next;
      }

      size_t field_size = 0;
      const size_t length = decode_length(m_source, field_size, ALLOWED_EOC_NESTINGS);
      if(!m_source->check_available(length)) {
         throw BER_Decoding_Error("Value truncated");
      }

      uint8_t* out = next.mutable_bits(length);
      if(m_source->read(out, length) != length) {
         throw BER_Decoding_Error("Value truncated");
      }

      if(next.tagging() == static_cast<uint32_t>(ASN1_Type::Eoc)) {
         continue;
      } else {
         break;
      }
   }

   return next;
}

/*
* Push a object back into the stream
*/
void BER_Decoder::push_back(const BER_Object& obj) {
   if(m_pushed.is_set()) {
      throw Invalid_State("BER_Decoder: Only one push back is allowed");
   }
   m_pushed = obj;
}

void BER_Decoder::push_back(BER_Object&& obj) {
   if(m_pushed.is_set()) {
      throw Invalid_State("BER_Decoder: Only one push back is allowed");
   }
   m_pushed = std::move(obj);
}

BER_Decoder BER_Decoder::start_cons(ASN1_Type type_tag, ASN1_Class class_tag) {
   BER_Object obj = get_next_object();
   obj.assert_is_a(type_tag, class_tag | ASN1_Class::Constructed);
   return BER_Decoder(std::move(obj), this);
}

/*
* Finish decoding a CONSTRUCTED type
*/
BER_Decoder& BER_Decoder::end_cons() {
   if(m_parent == nullptr) {
      throw Invalid_State("BER_Decoder::end_cons called with null parent");
   }
   if(!m_source->end_of_data()) {
      throw Decoding_Error("BER_Decoder::end_cons called with data left");
   }
   return (*m_parent);
}

BER_Decoder::BER_Decoder(BER_Object&& obj, BER_Decoder* parent) {
   m_data_src = std::make_unique<DataSource_BERObject>(std::move(obj));
   m_source = m_data_src.get();
   m_parent = parent;
}

/*
* BER_Decoder Constructor
*/
BER_Decoder::BER_Decoder(DataSource& src) {
   m_source = &src;
}

/*
* BER_Decoder Constructor
 */
BER_Decoder::BER_Decoder(const uint8_t data[], size_t length) {
   m_data_src = std::make_unique<DataSource_Memory>(data, length);
   m_source = m_data_src.get();
}

/*
* BER_Decoder Constructor
*/
BER_Decoder::BER_Decoder(const secure_vector<uint8_t>& data) {
   m_data_src = std::make_unique<DataSource_Memory>(data);
   m_source = m_data_src.get();
}

/*
* BER_Decoder Constructor
*/
BER_Decoder::BER_Decoder(const std::vector<uint8_t>& data) {
   m_data_src = std::make_unique<DataSource_Memory>(data.data(), data.size());
   m_source = m_data_src.get();
}

/*
* BER_Decoder Copy Constructor
*/
BER_Decoder::BER_Decoder(const BER_Decoder& other) {
   m_source = other.m_source;

   // take ownership
   std::swap(m_data_src, other.m_data_src);
   m_parent = other.m_parent;
}

/*
* Request for an object to decode itself
*/
BER_Decoder& BER_Decoder::decode(ASN1_Object& obj, ASN1_Type /*unused*/, ASN1_Class /*unused*/) {
   obj.decode_from(*this);
   return (*this);
}

/*
* Decode a BER encoded NULL
*/
BER_Decoder& BER_Decoder::decode_null() {
   BER_Object obj = get_next_object();
   obj.assert_is_a(ASN1_Type::Null, ASN1_Class::Universal);
   if(obj.length() > 0) {
      throw BER_Decoding_Error("NULL object had nonzero size");
   }
   return (*this);
}

BER_Decoder& BER_Decoder::decode_octet_string_bigint(BigInt& out) {
   secure_vector<uint8_t> out_vec;
   decode(out_vec, ASN1_Type::OctetString);
   out = BigInt::from_bytes(out_vec);
   return (*this);
}

/*
* Decode a BER encoded BOOLEAN
*/
BER_Decoder& BER_Decoder::decode(bool& out, ASN1_Type type_tag, ASN1_Class class_tag) {
   BER_Object obj = get_next_object();
   obj.assert_is_a(type_tag, class_tag);

   if(obj.length() != 1) {
      throw BER_Decoding_Error("BER boolean value had invalid size");
   }

   const uint8_t val = obj.bits()[0];

   // TODO if decoding DER we should reject non-canonical booleans
   out = (val != 0) ? true : false;

   return (*this);
}

/*
* Decode a small BER encoded INTEGER
*/
BER_Decoder& BER_Decoder::decode(size_t& out, ASN1_Type type_tag, ASN1_Class class_tag) {
   BigInt integer;
   decode(integer, type_tag, class_tag);

   if(integer.is_negative()) {
      throw BER_Decoding_Error("Decoded small integer value was negative");
   }

   if(integer.bits() > 32) {
      throw BER_Decoding_Error("Decoded integer value larger than expected");
   }

   out = 0;
   for(size_t i = 0; i != 4; ++i) {
      out = (out << 8) | integer.byte_at(3 - i);
   }

   return (*this);
}

/*
* Decode a small BER encoded INTEGER
*/
uint64_t BER_Decoder::decode_constrained_integer(ASN1_Type type_tag, ASN1_Class class_tag, size_t T_bytes) {
   if(T_bytes > 8) {
      throw BER_Decoding_Error("Can't decode small integer over 8 bytes");
   }

   BigInt integer;
   decode(integer, type_tag, class_tag);

   if(integer.bits() > 8 * T_bytes) {
      throw BER_Decoding_Error("Decoded integer value larger than expected");
   }

   uint64_t out = 0;
   for(size_t i = 0; i != 8; ++i) {
      out = (out << 8) | integer.byte_at(7 - i);
   }

   return out;
}

/*
* Decode a BER encoded INTEGER
*/
BER_Decoder& BER_Decoder::decode(BigInt& out, ASN1_Type type_tag, ASN1_Class class_tag) {
   BER_Object obj = get_next_object();
   obj.assert_is_a(type_tag, class_tag);

   if(obj.length() == 0) {
      out.clear();
   } else {
      const uint8_t first = obj.bits()[0];
      const bool negative = (first & 0x80) == 0x80;

      if(negative) {
         secure_vector<uint8_t> vec(obj.bits(), obj.bits() + obj.length());
         for(size_t i = obj.length(); i > 0; --i) {
            if(vec[i - 1]--) {
               break;
            }
         }
         for(size_t i = 0; i != obj.length(); ++i) {
            vec[i] = ~vec[i];
         }
         out._assign_from_bytes(vec);
         out.flip_sign();
      } else {
         out._assign_from_bytes(obj.data());
      }
   }

   return (*this);
}

namespace {

template <typename Alloc>
void asn1_decode_binary_string(std::vector<uint8_t, Alloc>& buffer,
                               const BER_Object& obj,
                               ASN1_Type real_type,
                               ASN1_Type type_tag,
                               ASN1_Class class_tag) {
   obj.assert_is_a(type_tag, class_tag);

   if(real_type == ASN1_Type::OctetString) {
      buffer.assign(obj.bits(), obj.bits() + obj.length());
   } else {
      if(obj.length() == 0) {
         throw BER_Decoding_Error("Invalid BIT STRING");
      }
      if(obj.bits()[0] >= 8) {
         throw BER_Decoding_Error("Bad number of unused bits in BIT STRING");
      }

      buffer.resize(obj.length() - 1);

      if(obj.length() > 1) {
         copy_mem(buffer.data(), obj.bits() + 1, obj.length() - 1);
      }
   }
}

}  // namespace

/*
* BER decode a BIT STRING or OCTET STRING
*/
BER_Decoder& BER_Decoder::decode(secure_vector<uint8_t>& buffer,
                                 ASN1_Type real_type,
                                 ASN1_Type type_tag,
                                 ASN1_Class class_tag) {
   if(real_type != ASN1_Type::OctetString && real_type != ASN1_Type::BitString) {
      throw BER_Bad_Tag("Bad tag for {BIT,OCTET} STRING", static_cast<uint32_t>(real_type));
   }

   asn1_decode_binary_string(buffer, get_next_object(), real_type, type_tag, class_tag);
   return (*this);
}

BER_Decoder& BER_Decoder::decode(std::vector<uint8_t>& buffer,
                                 ASN1_Type real_type,
                                 ASN1_Type type_tag,
                                 ASN1_Class class_tag) {
   if(real_type != ASN1_Type::OctetString && real_type != ASN1_Type::BitString) {
      throw BER_Bad_Tag("Bad tag for {BIT,OCTET} STRING", static_cast<uint32_t>(real_type));
   }

   asn1_decode_binary_string(buffer, get_next_object(), real_type, type_tag, class_tag);
   return (*this);
}

}  // namespace Botan

1	/*
2	* BER Decoder
3	* (C) 1999-2008,2015,2017,2018 Jack Lloyd
4	*
5	* Botan is released under the Simplified BSD License (see license.txt)
6	*/
7
8	#include <botan/ber_dec.h>
9
10	#include <botan/bigint.h>
11	#include <botan/internal/int_utils.h>
12	#include <botan/internal/loadstor.h>
13	#include <memory>
14
15	namespace Botan {
16
17	namespace {
18
19	/*
20	* This value is somewhat arbitrary. OpenSSL allows up to 128 nested
21	* indefinite length sequences. If you increase this, also increase the
22	* limit in the test in test_asn1.cpp
23	*/
24	const size_t ALLOWED_EOC_NESTINGS = 16;
25
26	/*
27	* BER decode an ASN.1 type tag
28	*/
29	size_t decode_tag(DataSource* ber, ASN1_Type& type_tag, ASN1_Class& class_tag) {	8,129,630✔
30	auto b = ber->read_byte();	8,129,630✔
31
32	if(!b) {	8,129,630✔
33	type_tag = ASN1_Type::NoObject;	124,081✔
34	class_tag = ASN1_Class::NoObject;	124,081✔
35	return 0;	124,081✔
36	}
37
38	if((*b & 0x1F) != 0x1F) {	8,005,549✔
39	type_tag = ASN1_Type(*b & 0x1F);	8,000,649✔
40	class_tag = ASN1_Class(*b & 0xE0);	8,000,649✔
41	return 1;	8,000,649✔
42	}
43
44	size_t tag_bytes = 1;	4,900✔
45	class_tag = ASN1_Class(*b & 0xE0);	4,900✔
46
47	size_t tag_buf = 0;	4,900✔
48	while(true) {	9,901✔
49	b = ber->read_byte();	9,901✔
50	if(!b) {	9,901✔
51	throw BER_Decoding_Error("Long-form tag truncated");	87✔
52	}
53	if((tag_buf >> 24) != 0) {	9,814✔
54	throw BER_Decoding_Error("Long-form tag overflowed 32 bits");	14✔
55	}
56	// This is required even by BER (see X.690 section 8.1.2.4.2 sentence c)
57	if(tag_bytes == 0 && b == 0x80) {	9,800✔
58	throw BER_Decoding_Error("Long form tag with leading zero");	×
59	}
60	++tag_bytes;	9,800✔
61	tag_buf = (tag_buf << 7) \| (*b & 0x7F);	9,800✔
62	if((*b & 0x80) == 0) {	9,800✔
63	break;
64	}
65	}
66	type_tag = ASN1_Type(tag_buf);	4,799✔
67	return tag_bytes;	4,799✔
68	}
69
70	/*
71	* Find the EOC marker
72	*/
73	size_t find_eoc(DataSource* src, size_t allow_indef);
74
75	/*
76	* BER decode an ASN.1 length field
77	*/
78	size_t decode_length(DataSource* ber, size_t& field_size, size_t allow_indef) {	8,005,353✔
79	uint8_t b = 0;	8,005,353✔
80	if(ber->read_byte(b) == 0) {	8,005,353✔
81	throw BER_Decoding_Error("Length field not found");	708✔
82	}
83	field_size = 1;	8,004,645✔
84	if((b & 0x80) == 0) {	8,004,645✔
85	return b;	7,510,497✔
86	}
87
88	field_size += (b & 0x7F);	494,148✔
89	if(field_size > 5) {	494,148✔
90	throw BER_Decoding_Error("Length field is too large");	1,014✔
91	}
92
93	if(field_size == 1) {	493,134✔
94	if(allow_indef == 0) {	273,122✔
95	throw BER_Decoding_Error("Nested EOC markers too deep, rejecting to avoid stack exhaustion");	231✔
96	} else {
97	return find_eoc(ber, allow_indef - 1);	272,891✔
98	}
99	}
100
101	size_t length = 0;
102
103	for(size_t i = 0; i != field_size - 1; ++i) {	610,133✔
104	if(get_byte<0>(length) != 0) {	390,185✔
105	throw BER_Decoding_Error("Field length overflow");	×
106	}
107	if(ber->read_byte(b) == 0) {	390,185✔
108	throw BER_Decoding_Error("Corrupted length field");	64✔
109	}
110	length = (length << 8) \| b;	390,121✔
111	}
112	return length;
113	}
114
115	/*
116	* Find the EOC marker
117	*/
118	size_t find_eoc(DataSource* ber, size_t allow_indef) {	272,891✔
119	secure_vector<uint8_t> buffer(DefaultBufferSize), data;	272,891✔
120
121	while(true) {	548,167✔
122	const size_t got = ber->peek(buffer.data(), buffer.size(), data.size());	1,096,334✔
123	if(got == 0) {	548,167✔
124	break;
125	}
126
127	data += std::make_pair(buffer.data(), got);	823,443✔
128	}
129
130	DataSource_Memory source(data);	277,838✔
131	data.clear();	272,891✔
132
133	size_t length = 0;
134	while(true) {	1,724,243✔
135	ASN1_Type type_tag = ASN1_Type::NoObject;	998,567✔
136	ASN1_Class class_tag = ASN1_Class::NoObject;	998,567✔
137	const size_t tag_size = decode_tag(&source, type_tag, class_tag);	998,567✔
138	if(type_tag == ASN1_Type::NoObject) {	998,545✔
139	break;
140	}
141
142	size_t length_size = 0;	937,478✔
143	const size_t item_size = decode_length(&source, length_size, allow_indef);	937,478✔
144	source.discard_next(item_size);	932,553✔
145
146	if(auto new_len = checked_add(length, item_size, tag_size, length_size)) {	1,865,106✔
147	length = new_len.value();	932,553✔
148	} else {
149	throw Decoding_Error("Integer overflow while decoding DER");	×
150	}
151
152	if(type_tag == ASN1_Type::Eoc && class_tag == ASN1_Class::Universal) {	932,553✔
153	break;
154	}
155	}	725,676✔
156	return length;	267,944✔
157	}	807,430✔
158
159	class DataSource_BERObject final : public DataSource {
160	public:
161	size_t read(uint8_t out[], size_t length) override {	27,294,126✔
162	BOTAN_ASSERT_NOMSG(m_offset <= m_obj.length());	27,294,126✔
163	const size_t got = std::min<size_t>(m_obj.length() - m_offset, length);	27,294,126✔
164	copy_mem(out, m_obj.bits() + m_offset, got);	27,294,126✔
165	m_offset += got;	27,294,126✔
166	return got;	27,294,126✔
167	}
168
169	size_t peek(uint8_t out[], size_t length, size_t peek_offset) const override {	44,245✔
170	BOTAN_ASSERT_NOMSG(m_offset <= m_obj.length());	44,245✔
171	const size_t bytes_left = m_obj.length() - m_offset;	44,245✔
172
173	if(peek_offset >= bytes_left) {	44,245✔
174	return 0;
175	}
176
177	const size_t got = std::min(bytes_left - peek_offset, length);	22,051✔
178	copy_mem(out, m_obj.bits() + m_offset + peek_offset, got);	22,051✔
179	return got;	22,051✔
180	}
181
182	bool check_available(size_t n) override {	1,332,460✔
183	BOTAN_ASSERT_NOMSG(m_offset <= m_obj.length());	1,332,460✔
184	return (n <= (m_obj.length() - m_offset));	1,332,460✔
185	}
186
187	bool end_of_data() const override { return get_bytes_read() == m_obj.length(); }	1,173,026✔
188
189	size_t get_bytes_read() const override { return m_offset; }	1,173,026✔
190
191	explicit DataSource_BERObject(BER_Object&& obj) : m_obj(std::move(obj)) {}	851,601✔
192
193	private:
194	BER_Object m_obj;
195	size_t m_offset = 0;
196	};
197
198	} // namespace
199
200	/*
201	* Check if more objects are there
202	*/
203	bool BER_Decoder::more_items() const {	756,099✔
204	if(m_source->end_of_data() && !m_pushed.is_set()) {	756,099✔
205	return false;	268,204✔
206	}
207	return true;
208	}
209
210	/*
211	* Verify that no bytes remain in the source
212	*/
213	BER_Decoder& BER_Decoder::verify_end() {	99,306✔
214	return verify_end("BER_Decoder::verify_end called, but data remains");	99,306✔
215	}
216
217	/*
218	* Verify that no bytes remain in the source
219	*/
220	BER_Decoder& BER_Decoder::verify_end(std::string_view err) {	120,849✔
221	if(!m_source->end_of_data() \|\| m_pushed.is_set()) {	120,849✔
222	throw Decoding_Error(err);	154✔
223	}
224	return (*this);	120,695✔
225	}
226
227	/*
228	* Discard all the bytes remaining in the source
229	*/
230	BER_Decoder& BER_Decoder::discard_remaining() {	6,818✔
231	uint8_t buf = 0;	6,818✔
232	while(m_source->read_byte(buf) != 0) {}	99,232✔
233	return (*this);	6,818✔
234	}
235
236	const BER_Object& BER_Decoder::peek_next_object() {	18,388✔
237	if(!m_pushed.is_set()) {	18,388✔
238	m_pushed = get_next_object();	18,152✔
239	}
240
241	return m_pushed;	18,375✔
242	}
243
244	/*
245	* Return the BER encoding of the next object
246	*/
247	BER_Object BER_Decoder::get_next_object() {	2,256,958✔
248	BER_Object next;	2,256,958✔
249
250	if(m_pushed.is_set()) {	2,256,958✔
251	std::swap(next, m_pushed);	174,946✔
252	return next;	174,946✔
253	}
254
255	for(;;) {	12,180,114✔
256	ASN1_Type type_tag = ASN1_Type::NoObject;	7,131,063✔
257	ASN1_Class class_tag = ASN1_Class::NoObject;	7,131,063✔
258	decode_tag(m_source, type_tag, class_tag);	7,131,063✔
259	next.set_tagging(type_tag, class_tag);	7,130,984✔
260	if(next.is_set() == false) { // no more objects	7,130,984✔
261	return next;	63,109✔
262	}
263
264	size_t field_size = 0;	7,067,875✔
265	const size_t length = decode_length(m_source, field_size, ALLOWED_EOC_NESTINGS);	7,067,875✔
266	if(!m_source->check_available(length)) {	7,065,836✔
267	throw BER_Decoding_Error("Value truncated");	3,822✔
268	}
269
270	uint8_t* out = next.mutable_bits(length);	7,062,014✔
271	if(m_source->read(out, length) != length) {	7,062,014✔
272	throw BER_Decoding_Error("Value truncated");	×
273	}
274
275	if(next.tagging() == static_cast<uint32_t>(ASN1_Type::Eoc)) {	7,062,014✔
276	continue;	5,049,051✔
277	} else {
278	break;
279	}
280	}
281
282	return next;	2,012,963✔
283	}	5,940✔
284
285	/*
286	* Push a object back into the stream
287	*/
288	void BER_Decoder::push_back(const BER_Object& obj) {	324✔
289	if(m_pushed.is_set()) {	324✔
290	throw Invalid_State("BER_Decoder: Only one push back is allowed");	×
291	}
292	m_pushed = obj;	324✔
293	}	324✔
294
295	void BER_Decoder::push_back(BER_Object&& obj) {	186,357✔
296	if(m_pushed.is_set()) {	186,357✔
297	throw Invalid_State("BER_Decoder: Only one push back is allowed");	×
298	}
299	m_pushed = std::move(obj);	186,357✔
300	}	186,357✔
301
302	BER_Decoder BER_Decoder::start_cons(ASN1_Type type_tag, ASN1_Class class_tag) {	827,917✔
303	BER_Object obj = get_next_object();	827,917✔
304	obj.assert_is_a(type_tag, class_tag \| ASN1_Class::Constructed);	826,523✔
305	return BER_Decoder(std::move(obj), this);	824,597✔
306	}	824,597✔
307
308	/*
309	* Finish decoding a CONSTRUCTED type
310	*/
311	BER_Decoder& BER_Decoder::end_cons() {	584,006✔
312	if(m_parent == nullptr) {	584,006✔
313	throw Invalid_State("BER_Decoder::end_cons called with null parent");	×
314	}
315	if(!m_source->end_of_data()) {	584,006✔
316	throw Decoding_Error("BER_Decoder::end_cons called with data left");	370✔
317	}
318	return (*m_parent);	583,636✔
319	}
320
321	BER_Decoder::BER_Decoder(BER_Object&& obj, BER_Decoder* parent) {	851,601✔
322	m_data_src = std::make_unique<DataSource_BERObject>(std::move(obj));	851,601✔
323	m_source = m_data_src.get();	851,601✔
324	m_parent = parent;	851,601✔
325	}	851,601✔
326
327	/*
328	* BER_Decoder Constructor
329	*/
330	BER_Decoder::BER_Decoder(DataSource& src) {	53,271✔
331	m_source = &src;	53,271✔
332	}	53,271✔
333
334	/*
335	* BER_Decoder Constructor
336	*/
337	BER_Decoder::BER_Decoder(const uint8_t data[], size_t length) {	99,382✔
338	m_data_src = std::make_unique<DataSource_Memory>(data, length);	99,382✔
339	m_source = m_data_src.get();	99,382✔
340	}	99,382✔
341
342	/*
343	* BER_Decoder Constructor
344	*/
345	BER_Decoder::BER_Decoder(const secure_vector<uint8_t>& data) {	4,695✔
346	m_data_src = std::make_unique<DataSource_Memory>(data);	4,695✔
347	m_source = m_data_src.get();	4,695✔
348	}	4,695✔
349
350	/*
351	* BER_Decoder Constructor
352	*/
353	BER_Decoder::BER_Decoder(const std::vector<uint8_t>& data) {	250,179✔
354	m_data_src = std::make_unique<DataSource_Memory>(data.data(), data.size());	250,179✔
355	m_source = m_data_src.get();	250,179✔
356	}	250,179✔
357
358	/*
359	* BER_Decoder Copy Constructor
360	*/
361	BER_Decoder::BER_Decoder(const BER_Decoder& other) {	178✔
362	m_source = other.m_source;	178✔
363
364	// take ownership
365	std::swap(m_data_src, other.m_data_src);	178✔
366	m_parent = other.m_parent;	178✔
367	}	178✔
368
369	/*
370	* Request for an object to decode itself
371	*/
372	BER_Decoder& BER_Decoder::decode(ASN1_Object& obj, ASN1_Type /unused/, ASN1_Class /unused/) {	819,373✔
373	obj.decode_from(*this);	819,373✔
374	return (*this);	806,318✔
375	}
376
377	/*
378	* Decode a BER encoded NULL
379	*/
380	BER_Decoder& BER_Decoder::decode_null() {	89✔
381	BER_Object obj = get_next_object();	89✔
382	obj.assert_is_a(ASN1_Type::Null, ASN1_Class::Universal);	89✔
383	if(obj.length() > 0) {	89✔
384	throw BER_Decoding_Error("NULL object had nonzero size");	×
385	}
386	return (*this);	89✔
387	}	89✔
388
389	BER_Decoder& BER_Decoder::decode_octet_string_bigint(BigInt& out) {	617✔
390	secure_vector<uint8_t> out_vec;	617✔
391	decode(out_vec, ASN1_Type::OctetString);	617✔
392	out = BigInt::from_bytes(out_vec);	617✔
393	return (*this);	615✔
394	}	615✔
395
396	/*
397	* Decode a BER encoded BOOLEAN
398	*/
399	BER_Decoder& BER_Decoder::decode(bool& out, ASN1_Type type_tag, ASN1_Class class_tag) {	47,228✔
400	BER_Object obj = get_next_object();	47,228✔
401	obj.assert_is_a(type_tag, class_tag);	47,297✔
402
403	if(obj.length() != 1) {	47,228✔
404	throw BER_Decoding_Error("BER boolean value had invalid size");	69✔
405	}
406
407	const uint8_t val = obj.bits()[0];	47,159✔
408
409	// TODO if decoding DER we should reject non-canonical booleans
410	out = (val != 0) ? true : false;	47,159✔
411
412	return (*this);	47,159✔
413	}	47,159✔
414
415	/*
416	* Decode a small BER encoded INTEGER
417	*/
418	BER_Decoder& BER_Decoder::decode(size_t& out, ASN1_Type type_tag, ASN1_Class class_tag) {	42,565✔
419	BigInt integer;	42,565✔
420	decode(integer, type_tag, class_tag);	42,565✔
421
422	if(integer.is_negative()) {	42,450✔
423	throw BER_Decoding_Error("Decoded small integer value was negative");	112✔
424	}
425
426	if(integer.bits() > 32) {	42,338✔
427	throw BER_Decoding_Error("Decoded integer value larger than expected");	29✔
428	}
429
430	out = 0;	42,309✔
431	for(size_t i = 0; i != 4; ++i) {	211,545✔
432	out = (out << 8) \| integer.byte_at(3 - i);	169,236✔
433	}
434
435	return (*this);	42,309✔
436	}	42,565✔
437
438	/*
439	* Decode a small BER encoded INTEGER
440	*/
441	uint64_t BER_Decoder::decode_constrained_integer(ASN1_Type type_tag, ASN1_Class class_tag, size_t T_bytes) {	3,616✔
442	if(T_bytes > 8) {	3,616✔
443	throw BER_Decoding_Error("Can't decode small integer over 8 bytes");	×
444	}
445
446	BigInt integer;	3,616✔
447	decode(integer, type_tag, class_tag);	3,616✔
448
449	if(integer.bits() > 8 * T_bytes) {	3,616✔
450	throw BER_Decoding_Error("Decoded integer value larger than expected");	×
451	}
452
453	uint64_t out = 0;
454	for(size_t i = 0; i != 8; ++i) {	32,544✔
455	out = (out << 8) \| integer.byte_at(7 - i);	28,928✔
456	}
457
458	return out;	3,616✔
459	}	3,616✔
460
461	/*
462	* Decode a BER encoded INTEGER
463	*/
464	BER_Decoder& BER_Decoder::decode(BigInt& out, ASN1_Type type_tag, ASN1_Class class_tag) {	145,251✔
465	BER_Object obj = get_next_object();	145,251✔
466	obj.assert_is_a(type_tag, class_tag);	144,758✔
467
468	if(obj.length() == 0) {	143,436✔
469	out.clear();	2,275✔
470	} else {
471	const uint8_t first = obj.bits()[0];	141,161✔
472	const bool negative = (first & 0x80) == 0x80;	141,161✔
473
474	if(negative) {	141,161✔
475	secure_vector<uint8_t> vec(obj.bits(), obj.bits() + obj.length());	6,780✔
476	for(size_t i = obj.length(); i > 0; --i) {	11,381✔
477	if(vec[i - 1]--) {	11,381✔
478	break;
479	}
480	}
481	for(size_t i = 0; i != obj.length(); ++i) {	49,512✔
482	vec[i] = ~vec[i];	44,054✔
483	}
484	out._assign_from_bytes(vec);	5,458✔
485	out.flip_sign();	10,916✔
486	} else {	5,458✔
487	out._assign_from_bytes(obj.data());	135,703✔
488	}
489	}
490
491	return (*this);	143,436✔
492	}	143,436✔
493
494	namespace {
495
496	template <typename Alloc>
497	void asn1_decode_binary_string(std::vector<uint8_t, Alloc>& buffer,	210,903✔
498	const BER_Object& obj,
499	ASN1_Type real_type,
500	ASN1_Type type_tag,
501	ASN1_Class class_tag) {
502	obj.assert_is_a(type_tag, class_tag);	210,903✔
503
504	if(real_type == ASN1_Type::OctetString) {	210,596✔
505	buffer.assign(obj.bits(), obj.bits() + obj.length());	134,361✔
506	} else {
507	if(obj.length() == 0) {	76,235✔
508	throw BER_Decoding_Error("Invalid BIT STRING");	20✔
509	}
510	if(obj.bits()[0] >= 8) {	76,215✔
511	throw BER_Decoding_Error("Bad number of unused bits in BIT STRING");	29✔
512	}
513
514	buffer.resize(obj.length() - 1);	76,186✔
515
516	if(obj.length() > 1) {	76,186✔
517	copy_mem(buffer.data(), obj.bits() + 1, obj.length() - 1);	74,568✔
518	}
519	}
520	}	210,547✔
521
522	} // namespace
523
524	/*
525	* BER decode a BIT STRING or OCTET STRING
526	*/
527	BER_Decoder& BER_Decoder::decode(secure_vector<uint8_t>& buffer,	12,896✔
528	ASN1_Type real_type,
529	ASN1_Type type_tag,
530	ASN1_Class class_tag) {
531	if(real_type != ASN1_Type::OctetString && real_type != ASN1_Type::BitString) {	12,896✔
532	throw BER_Bad_Tag("Bad tag for {BIT,OCTET} STRING", static_cast<uint32_t>(real_type));	×
533	}
534
535	asn1_decode_binary_string(buffer, get_next_object(), real_type, type_tag, class_tag);	12,896✔
536	return (*this);	12,857✔
537	}
538
539	BER_Decoder& BER_Decoder::decode(std::vector<uint8_t>& buffer,	200,171✔
540	ASN1_Type real_type,
541	ASN1_Type type_tag,
542	ASN1_Class class_tag) {
543	if(real_type != ASN1_Type::OctetString && real_type != ASN1_Type::BitString) {	200,171✔
544	throw BER_Bad_Tag("Bad tag for {BIT,OCTET} STRING", static_cast<uint32_t>(real_type));	1,802✔
545	}
546
547	asn1_decode_binary_string(buffer, get_next_object(), real_type, type_tag, class_tag);	198,369✔
548	return (*this);	197,690✔
549	}
550
551	} // namespace Botan

randombit / botan / 16091978769

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