/src/botan/src/lib/asn1/der_enc.cpp

Source
/*
* DER Encoder
* (C) 1999-2007,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/der_enc.h>

#include <botan/asn1_obj.h>
#include <botan/bigint.h>
#include <botan/internal/bit_ops.h>
#include <botan/internal/fmt.h>
#include <botan/internal/loadstor.h>
#include <botan/internal/mem_utils.h>
#include <algorithm>

namespace Botan {

namespace {

/*
* DER encode an ASN.1 type tag
*/
void encode_tag(std::vector<uint8_t>& encoded_tag, ASN1_Type type_tag_e, ASN1_Class class_tag_e) {
   const uint32_t type_tag = static_cast<uint32_t>(type_tag_e);
   const uint32_t class_tag = static_cast<uint32_t>(class_tag_e);

   if((class_tag | 0xE0) != 0xE0) {
      throw Encoding_Error(fmt("DER_Encoder: Invalid class tag {}", std::to_string(class_tag)));
   }

   if(type_tag <= 30) {
      encoded_tag.push_back(static_cast<uint8_t>(type_tag | class_tag));
   } else {
      size_t blocks = high_bit(static_cast<uint32_t>(type_tag)) + 6;
      blocks = (blocks - (blocks % 7)) / 7;

      BOTAN_ASSERT_NOMSG(blocks > 0);

      encoded_tag.push_back(static_cast<uint8_t>(class_tag | 0x1F));
      for(size_t i = 0; i != blocks - 1; ++i) {
         encoded_tag.push_back(0x80 | ((type_tag >> 7 * (blocks - i - 1)) & 0x7F));
      }
      encoded_tag.push_back(type_tag & 0x7F);
   }
}

/*
* DER encode an ASN.1 length field
*/
void encode_length(std::vector<uint8_t>& encoded_length, size_t length) {
   if(length <= 127) {
      encoded_length.push_back(static_cast<uint8_t>(length));
   } else {
      const size_t bytes_needed = significant_bytes(length);

      encoded_length.push_back(static_cast<uint8_t>(0x80 | bytes_needed));

      for(size_t i = sizeof(length) - bytes_needed; i < sizeof(length); ++i) {
         encoded_length.push_back(get_byte_var(i, length));
      }
   }
}

}  // namespace

DER_Encoder::DER_Encoder(secure_vector<uint8_t>& vec) {
   m_append_output = [&vec](const uint8_t b[], size_t l) { vec.insert(vec.end(), b, b + l); };
}

DER_Encoder::DER_Encoder(std::vector<uint8_t>& vec) {
   m_append_output = [&vec](const uint8_t b[], size_t l) { vec.insert(vec.end(), b, b + l); };
}

/*
* Push the encoded SEQUENCE/SET to the encoder stream
*/
void DER_Encoder::DER_Sequence::push_contents(DER_Encoder& der) {
   const auto real_class_tag = m_class_tag | ASN1_Class::Constructed;

   if(m_type_tag == ASN1_Type::Set) {
      std::sort(m_set_contents.begin(), m_set_contents.end());
      for(const auto& set_elem : m_set_contents) {
         m_contents += set_elem;
      }
      m_set_contents.clear();
   }

   der.add_object(m_type_tag, real_class_tag, m_contents.data(), m_contents.size());
   m_contents.clear();
}

/*
* Add an encoded value to the SEQUENCE/SET
*/
void DER_Encoder::DER_Sequence::add_bytes(const uint8_t data[], size_t length) {
   if(m_type_tag == ASN1_Type::Set) {
      m_set_contents.push_back(secure_vector<uint8_t>(data, data + length));
   } else {
      m_contents += std::make_pair(data, length);
   }
}

void DER_Encoder::DER_Sequence::add_bytes(const uint8_t hdr[], size_t hdr_len, const uint8_t val[], size_t val_len) {
   if(m_type_tag == ASN1_Type::Set) {
      secure_vector<uint8_t> m;
      m.reserve(hdr_len + val_len);
      m += std::make_pair(hdr, hdr_len);
      m += std::make_pair(val, val_len);
      m_set_contents.push_back(std::move(m));
   } else {
      m_contents += std::make_pair(hdr, hdr_len);
      m_contents += std::make_pair(val, val_len);
   }
}

/*
* Return the type and class taggings
*/
uint32_t DER_Encoder::DER_Sequence::tag_of() const {
   return m_type_tag | m_class_tag;
}

/*
* DER_Sequence Constructor
*/
DER_Encoder::DER_Sequence::DER_Sequence(ASN1_Type type_tag, ASN1_Class class_tag) :
      m_type_tag(type_tag), m_class_tag(class_tag) {}

/*
* Return the encoded contents
*/
secure_vector<uint8_t> DER_Encoder::get_contents() {
   if(!m_subsequences.empty()) {
      throw Invalid_State("DER_Encoder: Sequence hasn't been marked done");
   }

   if(m_append_output) {
      throw Invalid_State("DER_Encoder Cannot get contents when using output vector");
   }

   secure_vector<uint8_t> output;
   std::swap(output, m_default_outbuf);
   return output;
}

std::vector<uint8_t> DER_Encoder::get_contents_unlocked() {
   if(!m_subsequences.empty()) {
      throw Invalid_State("DER_Encoder: Sequence hasn't been marked done");
   }

   if(m_append_output) {
      throw Invalid_State("DER_Encoder Cannot get contents when using output vector");
   }

   std::vector<uint8_t> output(m_default_outbuf.begin(), m_default_outbuf.end());
   m_default_outbuf.clear();
   return output;
}

/*
* Start a new ASN.1 SEQUENCE/SET/EXPLICIT
*/
DER_Encoder& DER_Encoder::start_cons(ASN1_Type type_tag, ASN1_Class class_tag) {
   m_subsequences.push_back(DER_Sequence(type_tag, class_tag));
   return (*this);
}

/*
* Finish the current ASN.1 SEQUENCE/SET/EXPLICIT
*/
DER_Encoder& DER_Encoder::end_cons() {
   if(m_subsequences.empty()) {
      throw Invalid_State("DER_Encoder::end_cons: No such sequence");
   }

   DER_Sequence last_seq = std::move(m_subsequences[m_subsequences.size() - 1]);
   m_subsequences.pop_back();
   last_seq.push_contents(*this);

   return (*this);
}

/*
* Start a new ASN.1 EXPLICIT encoding
*/
DER_Encoder& DER_Encoder::start_explicit(uint16_t type_no) {
   ASN1_Type type_tag = static_cast<ASN1_Type>(type_no);

   // This would confuse DER_Sequence
   if(type_tag == ASN1_Type::Set) {
      throw Internal_Error("DER_Encoder.start_explicit(SET) not supported");
   }

   return start_cons(type_tag, ASN1_Class::ContextSpecific);
}

/*
* Finish the current ASN.1 EXPLICIT encoding
*/
DER_Encoder& DER_Encoder::end_explicit() {
   return end_cons();
}

/*
* Write raw bytes into the stream
*/
DER_Encoder& DER_Encoder::raw_bytes(const uint8_t bytes[], size_t length) {
   if(!m_subsequences.empty()) {
      m_subsequences[m_subsequences.size() - 1].add_bytes(bytes, length);
   } else if(m_append_output) {
      m_append_output(bytes, length);
   } else {
      m_default_outbuf += std::make_pair(bytes, length);
   }

   return (*this);
}

/*
* Write the encoding of the byte(s)
*/
DER_Encoder& DER_Encoder::add_object(ASN1_Type type_tag, ASN1_Class class_tag, const uint8_t rep[], size_t length) {
   std::vector<uint8_t> hdr;
   encode_tag(hdr, type_tag, class_tag);
   encode_length(hdr, length);

   if(!m_subsequences.empty()) {
      m_subsequences[m_subsequences.size() - 1].add_bytes(hdr.data(), hdr.size(), rep, length);
   } else if(m_append_output) {
      m_append_output(hdr.data(), hdr.size());
      m_append_output(rep, length);
   } else {
      m_default_outbuf += hdr;
      m_default_outbuf += std::make_pair(rep, length);
   }

   return (*this);
}

/*
* Encode a NULL object
*/
DER_Encoder& DER_Encoder::encode_null() {
   return add_object(ASN1_Type::Null, ASN1_Class::Universal, nullptr, 0);
}

/*
* DER encode a BOOLEAN
*/
DER_Encoder& DER_Encoder::encode(bool is_true) {
   return encode(is_true, ASN1_Type::Boolean, ASN1_Class::Universal);
}

/*
* DER encode a small INTEGER
*/
DER_Encoder& DER_Encoder::encode(size_t n) {
   return encode(BigInt::from_u64(n), ASN1_Type::Integer, ASN1_Class::Universal);
}

/*
* DER encode a small INTEGER
*/
DER_Encoder& DER_Encoder::encode(const BigInt& n) {
   return encode(n, ASN1_Type::Integer, ASN1_Class::Universal);
}

/*
* Encode this object
*/
DER_Encoder& DER_Encoder::encode(const uint8_t bytes[], size_t length, ASN1_Type real_type) {
   return encode(bytes, length, real_type, real_type, ASN1_Class::Universal);
}

/*
* DER encode a BOOLEAN
*/
DER_Encoder& DER_Encoder::encode(bool is_true, ASN1_Type type_tag, ASN1_Class class_tag) {
   uint8_t val = is_true ? 0xFF : 0x00;
   return add_object(type_tag, class_tag, &val, 1);
}

/*
* DER encode a small INTEGER
*/
DER_Encoder& DER_Encoder::encode(size_t n, ASN1_Type type_tag, ASN1_Class class_tag) {
   return encode(BigInt::from_u64(n), type_tag, class_tag);
}

/*
* DER encode an INTEGER
*/
DER_Encoder& DER_Encoder::encode(const BigInt& n, ASN1_Type type_tag, ASN1_Class class_tag) {
   if(n == 0) {
      return add_object(type_tag, class_tag, 0);
   }

   const size_t extra_zero = (n.bits() % 8 == 0) ? 1 : 0;

   auto contents = n.serialize(n.bytes() + extra_zero);
   if(n < 0) {
      for(unsigned char& content : contents) {
         content = ~content;
      }
      for(size_t i = contents.size(); i > 0; --i) {
         contents[i - 1] += 1;
         if(contents[i - 1] != 0) {
            break;
         }
      }
   }

   return add_object(type_tag, class_tag, contents);
}

/*
* DER encode an OCTET STRING or BIT STRING
*/
DER_Encoder& DER_Encoder::encode(
   const uint8_t bytes[], size_t length, ASN1_Type real_type, ASN1_Type type_tag, ASN1_Class class_tag) {
   if(real_type != ASN1_Type::OctetString && real_type != ASN1_Type::BitString) {
      throw Invalid_Argument("DER_Encoder: Invalid tag for byte/bit string");
   }

   if(real_type == ASN1_Type::BitString) {
      secure_vector<uint8_t> encoded;
      encoded.push_back(0);
      encoded += std::make_pair(bytes, length);
      return add_object(type_tag, class_tag, encoded);
   } else {
      return add_object(type_tag, class_tag, bytes, length);
   }
}

DER_Encoder& DER_Encoder::encode(const ASN1_Object& obj) {
   obj.encode_into(*this);
   return (*this);
}

/*
* Write the encoding of the byte(s)
*/
DER_Encoder& DER_Encoder::add_object(ASN1_Type type_tag, ASN1_Class class_tag, std::string_view rep_str) {
   return add_object(type_tag, class_tag, as_span_of_bytes(rep_str));
}

/*
* Write the encoding of the byte
*/
DER_Encoder& DER_Encoder::add_object(ASN1_Type type_tag, ASN1_Class class_tag, uint8_t rep) {
   return add_object(type_tag, class_tag, std::span<const uint8_t>{&rep, 1});
}

}  // namespace Botan

Coverage Report

Created: 2025-11-16 06:56

Line	Count	Source
1		/*
2		* DER Encoder
3		* (C) 1999-2007,2018 Jack Lloyd
4		*
5		* Botan is released under the Simplified BSD License (see license.txt)
6		*/
7
8		#include <botan/der_enc.h>
9
10		#include <botan/asn1_obj.h>
11		#include <botan/bigint.h>
12		#include <botan/internal/bit_ops.h>
13		#include <botan/internal/fmt.h>
14		#include <botan/internal/loadstor.h>
15		#include <botan/internal/mem_utils.h>
16		#include <algorithm>
17
18		namespace Botan {
19
20		namespace {
21
22		/*
23		* DER encode an ASN.1 type tag
24		*/
25	9	void encode_tag(std::vector<uint8_t>& encoded_tag, ASN1_Type type_tag_e, ASN1_Class class_tag_e) {
26	9	const uint32_t type_tag = static_cast<uint32_t>(type_tag_e);
27	9	const uint32_t class_tag = static_cast<uint32_t>(class_tag_e);
28
29	9	if((class_tag \| 0xE0) != 0xE0) {
30	0	throw Encoding_Error(fmt("DER_Encoder: Invalid class tag {}", std::to_string(class_tag)));
31	0	}
32
33	9	if(type_tag <= 30) {
34	9	encoded_tag.push_back(static_cast<uint8_t>(type_tag \| class_tag));
35	9	} else {
36	0	size_t blocks = high_bit(static_cast<uint32_t>(type_tag)) + 6;
37	0	blocks = (blocks - (blocks % 7)) / 7;
38
39	0	BOTAN_ASSERT_NOMSG(blocks > 0);
40
41	0	encoded_tag.push_back(static_cast<uint8_t>(class_tag \| 0x1F));
42	0	for(size_t i = 0; i != blocks - 1; ++i) {
43	0	encoded_tag.push_back(0x80 \| ((type_tag >> 7 * (blocks - i - 1)) & 0x7F));
44	0	}
45	0	encoded_tag.push_back(type_tag & 0x7F);
46	0	}
47	9	}
48
49		/*
50		* DER encode an ASN.1 length field
51		*/
52	9	void encode_length(std::vector<uint8_t>& encoded_length, size_t length) {
53	9	if(length <= 127) {
54	9	encoded_length.push_back(static_cast<uint8_t>(length));
55	9	} else {
56	0	const size_t bytes_needed = significant_bytes(length);
57
58	0	encoded_length.push_back(static_cast<uint8_t>(0x80 \| bytes_needed));
59
60	0	for(size_t i = sizeof(length) - bytes_needed; i < sizeof(length); ++i) {
61	0	encoded_length.push_back(get_byte_var(i, length));
62	0	}
63	0	}
64	9	}
65
66		} // namespace
67
68	0	DER_Encoder::DER_Encoder(secure_vector<uint8_t>& vec) {
69	0	m_append_output = [&vec](const uint8_t b[], size_t l) { vec.insert(vec.end(), b, b + l); };
70	0	}
71
72	9	DER_Encoder::DER_Encoder(std::vector<uint8_t>& vec) {
73	18	m_append_output = [&vec](const uint8_t b[], size_t l) { vec.insert(vec.end(), b, b + l); };
74	9	}
75
76		/*
77		* Push the encoded SEQUENCE/SET to the encoder stream
78		*/
79	0	void DER_Encoder::DER_Sequence::push_contents(DER_Encoder& der) {
80	0	const auto real_class_tag = m_class_tag \| ASN1_Class::Constructed;
81
82	0	if(m_type_tag == ASN1_Type::Set) {
83	0	std::sort(m_set_contents.begin(), m_set_contents.end());
84	0	for(const auto& set_elem : m_set_contents) {
85	0	m_contents += set_elem;
86	0	}
87	0	m_set_contents.clear();
88	0	}
89
90	0	der.add_object(m_type_tag, real_class_tag, m_contents.data(), m_contents.size());
91	0	m_contents.clear();
92	0	}
93
94		/*
95		* Add an encoded value to the SEQUENCE/SET
96		*/
97	0	void DER_Encoder::DER_Sequence::add_bytes(const uint8_t data[], size_t length) {
98	0	if(m_type_tag == ASN1_Type::Set) {
99	0	m_set_contents.push_back(secure_vector<uint8_t>(data, data + length));
100	0	} else {
101	0	m_contents += std::make_pair(data, length);
102	0	}
103	0	}
104
105	0	void DER_Encoder::DER_Sequence::add_bytes(const uint8_t hdr[], size_t hdr_len, const uint8_t val[], size_t val_len) {
106	0	if(m_type_tag == ASN1_Type::Set) {
107	0	secure_vector<uint8_t> m;
108	0	m.reserve(hdr_len + val_len);
109	0	m += std::make_pair(hdr, hdr_len);
110	0	m += std::make_pair(val, val_len);
111	0	m_set_contents.push_back(std::move(m));
112	0	} else {
113	0	m_contents += std::make_pair(hdr, hdr_len);
114	0	m_contents += std::make_pair(val, val_len);
115	0	}
116	0	}
117
118		/*
119		* Return the type and class taggings
120		*/
121	0	uint32_t DER_Encoder::DER_Sequence::tag_of() const {
122	0	return m_type_tag \| m_class_tag;
123	0	}
124
125		/*
126		* DER_Sequence Constructor
127		*/
128		DER_Encoder::DER_Sequence::DER_Sequence(ASN1_Type type_tag, ASN1_Class class_tag) :
129	0	m_type_tag(type_tag), m_class_tag(class_tag) {}
130
131		/*
132		* Return the encoded contents
133		*/
134	0	secure_vector<uint8_t> DER_Encoder::get_contents() {
135	0	if(!m_subsequences.empty()) {
136	0	throw Invalid_State("DER_Encoder: Sequence hasn't been marked done");
137	0	}
138
139	0	if(m_append_output) {
140	0	throw Invalid_State("DER_Encoder Cannot get contents when using output vector");
141	0	}
142
143	0	secure_vector<uint8_t> output;
144	0	std::swap(output, m_default_outbuf);
145	0	return output;
146	0	}
147
148	0	std::vector<uint8_t> DER_Encoder::get_contents_unlocked() {
149	0	if(!m_subsequences.empty()) {
150	0	throw Invalid_State("DER_Encoder: Sequence hasn't been marked done");
151	0	}
152
153	0	if(m_append_output) {
154	0	throw Invalid_State("DER_Encoder Cannot get contents when using output vector");
155	0	}
156
157	0	std::vector<uint8_t> output(m_default_outbuf.begin(), m_default_outbuf.end());
158	0	m_default_outbuf.clear();
159	0	return output;
160	0	}
161
162		/*
163		* Start a new ASN.1 SEQUENCE/SET/EXPLICIT
164		*/
165	0	DER_Encoder& DER_Encoder::start_cons(ASN1_Type type_tag, ASN1_Class class_tag) {
166	0	m_subsequences.push_back(DER_Sequence(type_tag, class_tag));
167	0	return (*this);
168	0	}
169
170		/*
171		* Finish the current ASN.1 SEQUENCE/SET/EXPLICIT
172		*/
173	0	DER_Encoder& DER_Encoder::end_cons() {
174	0	if(m_subsequences.empty()) {
175	0	throw Invalid_State("DER_Encoder::end_cons: No such sequence");
176	0	}
177
178	0	DER_Sequence last_seq = std::move(m_subsequences[m_subsequences.size() - 1]);
179	0	m_subsequences.pop_back();
180	0	last_seq.push_contents(*this);
181
182	0	return (*this);
183	0	}
184
185		/*
186		* Start a new ASN.1 EXPLICIT encoding
187		*/
188	0	DER_Encoder& DER_Encoder::start_explicit(uint16_t type_no) {
189	0	ASN1_Type type_tag = static_cast<ASN1_Type>(type_no);
190
191		// This would confuse DER_Sequence
192	0	if(type_tag == ASN1_Type::Set) {
193	0	throw Internal_Error("DER_Encoder.start_explicit(SET) not supported");
194	0	}
195
196	0	return start_cons(type_tag, ASN1_Class::ContextSpecific);
197	0	}
198
199		/*
200		* Finish the current ASN.1 EXPLICIT encoding
201		*/
202	0	DER_Encoder& DER_Encoder::end_explicit() {
203	0	return end_cons();
204	0	}
205
206		/*
207		* Write raw bytes into the stream
208		*/
209	0	DER_Encoder& DER_Encoder::raw_bytes(const uint8_t bytes[], size_t length) {
210	0	if(!m_subsequences.empty()) {
211	0	m_subsequences[m_subsequences.size() - 1].add_bytes(bytes, length);
212	0	} else if(m_append_output) {
213	0	m_append_output(bytes, length);
214	0	} else {
215	0	m_default_outbuf += std::make_pair(bytes, length);
216	0	}
217
218	0	return (*this);
219	0	}
220
221		/*
222		* Write the encoding of the byte(s)
223		*/
224	9	DER_Encoder& DER_Encoder::add_object(ASN1_Type type_tag, ASN1_Class class_tag, const uint8_t rep[], size_t length) {
225	9	std::vector<uint8_t> hdr;
226	9	encode_tag(hdr, type_tag, class_tag);
227	9	encode_length(hdr, length);
228
229	9	if(!m_subsequences.empty()) {
230	0	m_subsequences[m_subsequences.size() - 1].add_bytes(hdr.data(), hdr.size(), rep, length);
231	9	} else if(m_append_output) {
232	9	m_append_output(hdr.data(), hdr.size());
233	9	m_append_output(rep, length);
234	9	} else {
235	0	m_default_outbuf += hdr;
236	0	m_default_outbuf += std::make_pair(rep, length);
237	0	}
238
239	9	return (*this);
240	9	}
241
242		/*
243		* Encode a NULL object
244		*/
245	0	DER_Encoder& DER_Encoder::encode_null() {
246	0	return add_object(ASN1_Type::Null, ASN1_Class::Universal, nullptr, 0);
247	0	}
248
249		/*
250		* DER encode a BOOLEAN
251		*/
252	0	DER_Encoder& DER_Encoder::encode(bool is_true) {
253	0	return encode(is_true, ASN1_Type::Boolean, ASN1_Class::Universal);
254	0	}
255
256		/*
257		* DER encode a small INTEGER
258		*/
259	0	DER_Encoder& DER_Encoder::encode(size_t n) {
260	0	return encode(BigInt::from_u64(n), ASN1_Type::Integer, ASN1_Class::Universal);
261	0	}
262
263		/*
264		* DER encode a small INTEGER
265		*/
266	0	DER_Encoder& DER_Encoder::encode(const BigInt& n) {
267	0	return encode(n, ASN1_Type::Integer, ASN1_Class::Universal);
268	0	}
269
270		/*
271		* Encode this object
272		*/
273	0	DER_Encoder& DER_Encoder::encode(const uint8_t bytes[], size_t length, ASN1_Type real_type) {
274	0	return encode(bytes, length, real_type, real_type, ASN1_Class::Universal);
275	0	}
276
277		/*
278		* DER encode a BOOLEAN
279		*/
280	0	DER_Encoder& DER_Encoder::encode(bool is_true, ASN1_Type type_tag, ASN1_Class class_tag) {
281	0	uint8_t val = is_true ? 0xFF : 0x00;
282	0	return add_object(type_tag, class_tag, &val, 1);
283	0	}
284
285		/*
286		* DER encode a small INTEGER
287		*/
288	0	DER_Encoder& DER_Encoder::encode(size_t n, ASN1_Type type_tag, ASN1_Class class_tag) {
289	0	return encode(BigInt::from_u64(n), type_tag, class_tag);
290	0	}
291
292		/*
293		* DER encode an INTEGER
294		*/
295	0	DER_Encoder& DER_Encoder::encode(const BigInt& n, ASN1_Type type_tag, ASN1_Class class_tag) {
296	0	if(n == 0) {
297	0	return add_object(type_tag, class_tag, 0);
298	0	}
299
300	0	const size_t extra_zero = (n.bits() % 8 == 0) ? 1 : 0;
301
302	0	auto contents = n.serialize(n.bytes() + extra_zero);
303	0	if(n < 0) {
304	0	for(unsigned char& content : contents) {
305	0	content = ~content;
306	0	}
307	0	for(size_t i = contents.size(); i > 0; --i) {
308	0	contents[i - 1] += 1;
309	0	if(contents[i - 1] != 0) {
310	0	break;
311	0	}
312	0	}
313	0	}
314
315	0	return add_object(type_tag, class_tag, contents);
316	0	}
317
318		/*
319		* DER encode an OCTET STRING or BIT STRING
320		*/
321		DER_Encoder& DER_Encoder::encode(
322	0	const uint8_t bytes[], size_t length, ASN1_Type real_type, ASN1_Type type_tag, ASN1_Class class_tag) {
323	0	if(real_type != ASN1_Type::OctetString && real_type != ASN1_Type::BitString) {
324	0	throw Invalid_Argument("DER_Encoder: Invalid tag for byte/bit string");
325	0	}
326
327	0	if(real_type == ASN1_Type::BitString) {
328	0	secure_vector<uint8_t> encoded;
329	0	encoded.push_back(0);
330	0	encoded += std::make_pair(bytes, length);
331	0	return add_object(type_tag, class_tag, encoded);
332	0	} else {
333	0	return add_object(type_tag, class_tag, bytes, length);
334	0	}
335	0	}
336
337	9	DER_Encoder& DER_Encoder::encode(const ASN1_Object& obj) {
338	9	obj.encode_into(*this);
339	9	return (*this);
340	9	}
341
342		/*
343		* Write the encoding of the byte(s)
344		*/
345	0	DER_Encoder& DER_Encoder::add_object(ASN1_Type type_tag, ASN1_Class class_tag, std::string_view rep_str) {
346	0	return add_object(type_tag, class_tag, as_span_of_bytes(rep_str));
347	0	}
348
349		/*
350		* Write the encoding of the byte
351		*/
352	0	DER_Encoder& DER_Encoder::add_object(ASN1_Type type_tag, ASN1_Class class_tag, uint8_t rep) {
353	0	return add_object(type_tag, class_tag, std::span<const uint8_t>{&rep, 1});
354	0	}
355
356		} // namespace Botan