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/*
* DER Encoder
* (C) 1999-2007,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_DER_ENCODER_H_
#define BOTAN_DER_ENCODER_H_
#include <botan/asn1_obj.h>
#include <vector>
#include <functional>
namespace Botan {
class BigInt;
class ASN1_Object;
/**
* General DER Encoding Object
*/
class BOTAN_PUBLIC_API(2,0) DER_Encoder final
{
public:
typedef std::function<void (const uint8_t[], size_t)> append_fn;
/**
* DER encode, writing to an internal buffer
* Use get_contents or get_contents_unlocked to read the results
* after all encoding is completed.
*/
DER_Encoder() = default;
/**
* DER encode, writing to @param vec
* If this constructor is used, get_contents* may not be called.
*/
DER_Encoder(secure_vector<uint8_t>& vec);
/**
* DER encode, writing to @param vec
* If this constructor is used, get_contents* may not be called.
*/
DER_Encoder(std::vector<uint8_t>& vec);
/**
* DER encode, calling append to write output
* If this constructor is used, get_contents* may not be called.
*/
DER_Encoder(append_fn append) : m_append_output(append) {}
secure_vector<uint8_t> get_contents();
std::vector<uint8_t> get_contents_unlocked();
DER_Encoder& start_cons(ASN1_Tag type_tag,
ASN1_Tag class_tag = UNIVERSAL);
DER_Encoder& end_cons();
DER_Encoder& start_explicit(uint16_t type_tag);
DER_Encoder& end_explicit();
/**
* Insert raw bytes directly into the output stream
*/
DER_Encoder& raw_bytes(const uint8_t val[], size_t len);
template<typename Alloc>
DER_Encoder& raw_bytes(const std::vector<uint8_t, Alloc>& val)
{
return raw_bytes(val.data(), val.size());
}
DER_Encoder& encode_null();
DER_Encoder& encode(bool b);
DER_Encoder& encode(size_t s);
DER_Encoder& encode(const BigInt& n);
DER_Encoder& encode(const uint8_t val[], size_t len, ASN1_Tag real_type);
template<typename Alloc>
DER_Encoder& encode(const std::vector<uint8_t, Alloc>& vec, ASN1_Tag real_type)
{
return encode(vec.data(), vec.size(), real_type);
}
DER_Encoder& encode(bool b,
ASN1_Tag type_tag,
ASN1_Tag class_tag = CONTEXT_SPECIFIC);
DER_Encoder& encode(size_t s,
ASN1_Tag type_tag,
ASN1_Tag class_tag = CONTEXT_SPECIFIC);
DER_Encoder& encode(const BigInt& n,
ASN1_Tag type_tag,
ASN1_Tag class_tag = CONTEXT_SPECIFIC);
DER_Encoder& encode(const uint8_t v[], size_t len,
ASN1_Tag real_type,
ASN1_Tag type_tag,
ASN1_Tag class_tag = CONTEXT_SPECIFIC);
template<typename Alloc>
DER_Encoder& encode(const std::vector<uint8_t, Alloc>& bytes,
ASN1_Tag real_type,
ASN1_Tag type_tag, ASN1_Tag class_tag)
{
return encode(bytes.data(), bytes.size(),
real_type, type_tag, class_tag);
}
template<typename T>
DER_Encoder& encode_optional(const T& value, const T& default_value)
{
if(value != default_value)
encode(value);
return (*this);
}
template<typename T>
DER_Encoder& encode_list(const std::vector<T>& values)
{
for(size_t i = 0; i != values.size(); ++i)
encode(values[i]);
return (*this);
}
/*
* Request for an object to encode itself to this stream
*/
DER_Encoder& encode(const ASN1_Object& obj);
/*
* Conditionally write some values to the stream
*/
DER_Encoder& encode_if(bool pred, DER_Encoder& enc)
{
if(pred)
return raw_bytes(enc.get_contents());
return (*this);
}
DER_Encoder& encode_if(bool pred, const ASN1_Object& obj)
{
if(pred)
encode(obj);
return (*this);
}
DER_Encoder& add_object(ASN1_Tag type_tag, ASN1_Tag class_tag,
const uint8_t rep[], size_t length);
DER_Encoder& add_object(ASN1_Tag type_tag, ASN1_Tag class_tag,
const std::vector<uint8_t>& rep)
{
return add_object(type_tag, class_tag, rep.data(), rep.size());
}
DER_Encoder& add_object(ASN1_Tag type_tag, ASN1_Tag class_tag,
const secure_vector<uint8_t>& rep)
{
return add_object(type_tag, class_tag, rep.data(), rep.size());
}
DER_Encoder& add_object(ASN1_Tag type_tag, ASN1_Tag class_tag,
const std::string& str);
DER_Encoder& add_object(ASN1_Tag type_tag, ASN1_Tag class_tag,
uint8_t val);
private:
class DER_Sequence final
{
public:
ASN1_Tag tag_of() const;
void push_contents(DER_Encoder& der);
void add_bytes(const uint8_t val[], size_t len);
void add_bytes(const uint8_t hdr[], size_t hdr_len,
const uint8_t val[], size_t val_len);
DER_Sequence(ASN1_Tag, ASN1_Tag);
DER_Sequence(DER_Sequence&& seq)
{
std::swap(m_type_tag, seq.m_type_tag);
std::swap(m_class_tag, seq.m_class_tag);
std::swap(m_contents, seq.m_contents);
std::swap(m_set_contents, seq.m_set_contents);
}
DER_Sequence& operator=(DER_Sequence&& seq)
{
std::swap(m_type_tag, seq.m_type_tag);
std::swap(m_class_tag, seq.m_class_tag);
std::swap(m_contents, seq.m_contents);
std::swap(m_set_contents, seq.m_set_contents);
return (*this);
}
DER_Sequence(const DER_Sequence& seq) = default;
DER_Sequence& operator=(const DER_Sequence& seq) = default;
private:
ASN1_Tag m_type_tag, m_class_tag;
secure_vector<uint8_t> m_contents;
std::vector< secure_vector<uint8_t> > m_set_contents;
};
append_fn m_append_output;
secure_vector<uint8_t> m_default_outbuf;
std::vector<DER_Sequence> m_subsequences;
};
}
#endif
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