8#include <botan/der_enc.h>
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>
25void encode_tag(std::vector<uint8_t>& encoded_tag,
ASN1_Type type_tag_e,
ASN1_Class class_tag_e) {
26 const uint32_t type_tag =
static_cast<uint32_t
>(type_tag_e);
27 const uint32_t class_tag =
static_cast<uint32_t
>(class_tag_e);
29 if((class_tag | 0xE0) != 0xE0) {
30 throw Encoding_Error(
fmt(
"DER_Encoder: Invalid class tag {}", std::to_string(class_tag)));
34 encoded_tag.push_back(
static_cast<uint8_t
>(type_tag | class_tag));
36 size_t blocks =
high_bit(
static_cast<uint32_t
>(type_tag)) + 6;
37 blocks = (blocks - (blocks % 7)) / 7;
41 encoded_tag.push_back(
static_cast<uint8_t
>(class_tag | 0x1F));
42 for(
size_t i = 0; i != blocks - 1; ++i) {
43 encoded_tag.push_back(0x80 | ((type_tag >> 7 * (blocks - i - 1)) & 0x7F));
45 encoded_tag.push_back(type_tag & 0x7F);
52void encode_length(std::vector<uint8_t>& encoded_length,
size_t length) {
54 encoded_length.push_back(
static_cast<uint8_t
>(length));
58 encoded_length.push_back(
static_cast<uint8_t
>(0x80 | bytes_needed));
60 for(
size_t i =
sizeof(length) - bytes_needed; i <
sizeof(length); ++i) {
69 m_append_output = [&vec](
const uint8_t b[],
size_t l) { vec.insert(vec.end(), b, b + l); };
73 m_append_output = [&vec](
const uint8_t b[],
size_t l) { vec.insert(vec.end(), b, b + l); };
79void DER_Encoder::DER_Sequence::push_contents(
DER_Encoder& der) {
83 std::sort(m_set_contents.begin(), m_set_contents.end());
84 for(
const auto& set_elem : m_set_contents) {
85 m_contents += set_elem;
87 m_set_contents.clear();
90 der.
add_object(m_type_tag, real_class_tag, m_contents.data(), m_contents.size());
97void DER_Encoder::DER_Sequence::add_bytes(
const uint8_t data[],
size_t length) {
101 m_contents += std::make_pair(data, length);
105void DER_Encoder::DER_Sequence::add_bytes(
const uint8_t hdr[],
size_t hdr_len,
const uint8_t val[],
size_t val_len) {
108 m.reserve(hdr_len + val_len);
109 m += std::make_pair(hdr, hdr_len);
110 m += std::make_pair(val, val_len);
111 m_set_contents.push_back(std::move(m));
113 m_contents += std::make_pair(hdr, hdr_len);
114 m_contents += std::make_pair(val, val_len);
121uint32_t DER_Encoder::DER_Sequence::tag_of()
const {
122 return m_type_tag | m_class_tag;
129 m_type_tag(type_tag), m_class_tag(class_tag) {}
135 if(!m_subsequences.empty()) {
136 throw Invalid_State(
"DER_Encoder: Sequence hasn't been marked done");
139 if(m_append_output) {
140 throw Invalid_State(
"DER_Encoder Cannot get contents when using output vector");
144 std::swap(output, m_default_outbuf);
149 if(!m_subsequences.empty()) {
150 throw Invalid_State(
"DER_Encoder: Sequence hasn't been marked done");
153 if(m_append_output) {
154 throw Invalid_State(
"DER_Encoder Cannot get contents when using output vector");
157 std::vector<uint8_t> output(m_default_outbuf.begin(), m_default_outbuf.end());
158 m_default_outbuf.clear();
166 m_subsequences.push_back(DER_Sequence(type_tag, class_tag));
174 if(m_subsequences.empty()) {
175 throw Invalid_State(
"DER_Encoder::end_cons: No such sequence");
178 DER_Sequence last_seq = std::move(m_subsequences[m_subsequences.size() - 1]);
179 m_subsequences.pop_back();
180 last_seq.push_contents(*
this);
193 throw Internal_Error(
"DER_Encoder.start_explicit(SET) not supported");
210 if(!m_subsequences.empty()) {
211 m_subsequences[m_subsequences.size() - 1].add_bytes(bytes, length);
212 }
else if(m_append_output) {
213 m_append_output(bytes, length);
215 m_default_outbuf += std::make_pair(bytes, length);
225 std::vector<uint8_t> hdr;
226 encode_tag(hdr, type_tag, class_tag);
227 encode_length(hdr, length);
229 if(!m_subsequences.empty()) {
230 m_subsequences[m_subsequences.size() - 1].add_bytes(hdr.data(), hdr.size(), rep, length);
231 }
else if(m_append_output) {
232 m_append_output(hdr.data(), hdr.size());
233 m_append_output(rep, length);
235 m_default_outbuf += hdr;
236 m_default_outbuf += std::make_pair(rep, length);
281 uint8_t val = is_true ? 0xFF : 0x00;
282 return add_object(type_tag, class_tag, &val, 1);
300 const size_t extra_zero = (n.
bits() % 8 == 0) ? 1 : 0;
304 for(
unsigned char& content : contents) {
307 for(
size_t i = contents.size(); i > 0; --i) {
308 contents[i - 1] += 1;
309 if(contents[i - 1] != 0) {
315 return add_object(type_tag, class_tag, contents);
329 encoded.push_back(0);
330 encoded += std::make_pair(bytes, length);
331 return add_object(type_tag, class_tag, encoded);
333 return add_object(type_tag, class_tag, bytes, length);
353 return add_object(type_tag, class_tag, std::span<const uint8_t>{&rep, 1});
#define BOTAN_ASSERT_NOMSG(expr)
virtual void encode_into(DER_Encoder &to) const =0
static BigInt from_u64(uint64_t n)
T serialize(size_t len) const
DER_Encoder & add_object(ASN1_Type type_tag, ASN1_Class class_tag, const uint8_t rep[], size_t length)
secure_vector< uint8_t > get_contents()
DER_Encoder & end_explicit()
DER_Encoder & start_explicit(uint16_t type_tag)
DER_Encoder & start_cons(ASN1_Type type_tag, ASN1_Class class_tag)
DER_Encoder & raw_bytes(const uint8_t val[], size_t len)
DER_Encoder & encode_null()
std::vector< uint8_t > get_contents_unlocked()
DER_Encoder & encode(bool b)
std::span< const uint8_t > as_span_of_bytes(const char *s, size_t len)
std::string fmt(std::string_view format, const T &... args)
BOTAN_FORCE_INLINE constexpr size_t significant_bytes(T n)
BOTAN_FORCE_INLINE constexpr size_t high_bit(T n)
std::vector< T, secure_allocator< T > > secure_vector
constexpr uint8_t get_byte_var(size_t byte_num, T input)