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/*
* ASN.1 Internals
* (C) 1999-2007,2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ASN1_H_
#define BOTAN_ASN1_H_
#include <botan/secmem.h>
#include <botan/exceptn.h>
namespace Botan {
class BER_Decoder;
class DER_Encoder;
/**
* ASN.1 Type and Class Tags
*/
enum ASN1_Tag : uint32_t {
UNIVERSAL = 0x00,
APPLICATION = 0x40,
CONTEXT_SPECIFIC = 0x80,
CONSTRUCTED = 0x20,
PRIVATE = CONSTRUCTED | CONTEXT_SPECIFIC,
EOC = 0x00,
BOOLEAN = 0x01,
INTEGER = 0x02,
BIT_STRING = 0x03,
OCTET_STRING = 0x04,
NULL_TAG = 0x05,
OBJECT_ID = 0x06,
ENUMERATED = 0x0A,
SEQUENCE = 0x10,
SET = 0x11,
UTF8_STRING = 0x0C,
NUMERIC_STRING = 0x12,
PRINTABLE_STRING = 0x13,
T61_STRING = 0x14,
IA5_STRING = 0x16,
VISIBLE_STRING = 0x1A,
UNIVERSAL_STRING = 0x1C,
BMP_STRING = 0x1E,
UTC_TIME = 0x17,
GENERALIZED_TIME = 0x18,
UTC_OR_GENERALIZED_TIME = 0x19,
NO_OBJECT = 0xFF00,
DIRECTORY_STRING = 0xFF01
};
std::string BOTAN_DLL asn1_tag_to_string(ASN1_Tag type);
/**
* Basic ASN.1 Object Interface
*/
class BOTAN_PUBLIC_API(2,0) ASN1_Object
{
public:
/**
* Encode whatever this object is into to
* @param to the DER_Encoder that will be written to
*/
virtual void encode_into(DER_Encoder& to) const = 0;
/**
* Decode whatever this object is from from
* @param from the BER_Decoder that will be read from
*/
virtual void decode_from(BER_Decoder& from) = 0;
/**
* Return the encoding of this object. This is a convenience
* method when just one object needs to be serialized. Use
* DER_Encoder for complicated encodings.
*/
std::vector<uint8_t> BER_encode() const;
ASN1_Object() = default;
ASN1_Object(const ASN1_Object&) = default;
ASN1_Object & operator=(const ASN1_Object&) = default;
virtual ~ASN1_Object() = default;
};
/**
* BER Encoded Object
*/
class BOTAN_PUBLIC_API(2,0) BER_Object final
{
public:
BER_Object() : type_tag(NO_OBJECT), class_tag(UNIVERSAL) {}
bool is_set() const { return type_tag != NO_OBJECT; }
ASN1_Tag tagging() const { return ASN1_Tag(type() | get_class()); }
ASN1_Tag type() const { return type_tag; }
ASN1_Tag get_class() const { return class_tag; }
const uint8_t* bits() const { return value.data(); }
size_t length() const { return value.size(); }
void assert_is_a(ASN1_Tag type_tag, ASN1_Tag class_tag,
const std::string& descr = "object") const;
bool is_a(ASN1_Tag type_tag, ASN1_Tag class_tag) const;
bool is_a(int type_tag, ASN1_Tag class_tag) const;
BOTAN_DEPRECATED_PUBLIC_MEMBER_VARIABLES:
/*
* The following member variables are public for historical reasons, but
* will be made private in a future major release. Use the accessor
* functions above.
*/
ASN1_Tag type_tag, class_tag;
secure_vector<uint8_t> value;
private:
friend class BER_Decoder;
void set_tagging(ASN1_Tag type_tag, ASN1_Tag class_tag);
uint8_t* mutable_bits(size_t length)
{
value.resize(length);
return value.data();
}
};
/*
* ASN.1 Utility Functions
*/
class DataSource;
namespace ASN1 {
std::vector<uint8_t> put_in_sequence(const std::vector<uint8_t>& val);
std::vector<uint8_t> put_in_sequence(const uint8_t bits[], size_t len);
std::string to_string(const BER_Object& obj);
/**
* Heuristics tests; is this object possibly BER?
* @param src a data source that will be peeked at but not modified
*/
bool maybe_BER(DataSource& src);
}
/**
* General BER Decoding Error Exception
*/
class BOTAN_PUBLIC_API(2,0) BER_Decoding_Error : public Decoding_Error
{
public:
explicit BER_Decoding_Error(const std::string&);
};
/**
* Exception For Incorrect BER Taggings
*/
class BOTAN_PUBLIC_API(2,0) BER_Bad_Tag final : public BER_Decoding_Error
{
public:
BER_Bad_Tag(const std::string& msg, ASN1_Tag tag);
BER_Bad_Tag(const std::string& msg, ASN1_Tag tag1, ASN1_Tag tag2);
};
}
#endif
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