/*

* ASN.1 Internals

* (C) 1999-2007,2018 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/asn1_obj.h>

#include <botan/data_src.h>

#include <botan/der_enc.h>

#include <botan/internal/fmt.h>

#include <botan/internal/stl_util.h>

#include <sstream>

namespace Botan {

std::vector<uint8_t> ASN1_Object::BER_encode() const {

   std::vector<uint8_t> output;

   DER_Encoder der(output);

   this->encode_into(der);

   return output;

}

/*

* Check a type invariant on BER data

*/

void BER_Object::assert_is_a(ASN1_Type expected_type_tag, ASN1_Class expected_class_tag, std::string_view descr) const {

   if(this->is_a(expected_type_tag, expected_class_tag) == false) {

      std::stringstream msg;

      msg << "Tag mismatch when decoding " << descr << " got ";

      if(m_class_tag == ASN1_Class::NoObject && m_type_tag == ASN1_Type::NoObject) {

         msg << "EOF";

      } else {

         if(m_class_tag == ASN1_Class::Universal || m_class_tag == ASN1_Class::Constructed) {

            msg << asn1_tag_to_string(m_type_tag);

         } else {

            msg << std::to_string(static_cast<uint32_t>(m_type_tag));

         }

         msg << "/" << asn1_class_to_string(m_class_tag);

      }

      msg << " expected ";

      if(expected_class_tag == ASN1_Class::Universal || expected_class_tag == ASN1_Class::Constructed) {

         msg << asn1_tag_to_string(expected_type_tag);

      } else {

         msg << std::to_string(static_cast<uint32_t>(expected_type_tag));

      }

      msg << "/" << asn1_class_to_string(expected_class_tag);

      throw BER_Decoding_Error(msg.str());

   }

}

bool BER_Object::is_a(ASN1_Type expected_type_tag, ASN1_Class expected_class_tag) const {

   return (m_type_tag == expected_type_tag && m_class_tag == expected_class_tag);

}

bool BER_Object::is_a(int expected_type_tag, ASN1_Class expected_class_tag) const {

   return is_a(ASN1_Type(expected_type_tag), expected_class_tag);

}

void BER_Object::set_tagging(ASN1_Type type_tag, ASN1_Class class_tag) {

   m_type_tag = type_tag;

   m_class_tag = class_tag;

}

std::string asn1_class_to_string(ASN1_Class type) {

   switch(type) {

      case ASN1_Class::Universal:

         return "UNIVERSAL";

      case ASN1_Class::Constructed:

         return "CONSTRUCTED";

      case ASN1_Class::ContextSpecific:

         return "CONTEXT_SPECIFIC";

      case ASN1_Class::Application:

         return "APPLICATION";

      case ASN1_Class::Private:

         return "PRIVATE";

      case ASN1_Class::NoObject:

         return "NO_OBJECT";

      default:

         return "CLASS(" + std::to_string(static_cast<size_t>(type)) + ")";

   }

}

std::string asn1_tag_to_string(ASN1_Type type) {

   switch(type) {

      case ASN1_Type::Sequence:

         return "SEQUENCE";

      case ASN1_Type::Set:

         return "SET";

      case ASN1_Type::PrintableString:

         return "PRINTABLE STRING";

      case ASN1_Type::NumericString:

         return "NUMERIC STRING";

      case ASN1_Type::Ia5String:

         return "IA5 STRING";

      case ASN1_Type::TeletexString:

         return "T61 STRING";

      case ASN1_Type::Utf8String:

         return "UTF8 STRING";

      case ASN1_Type::VisibleString:

         return "VISIBLE STRING";

      case ASN1_Type::BmpString:

         return "BMP STRING";

      case ASN1_Type::UniversalString:

         return "UNIVERSAL STRING";

      case ASN1_Type::UtcTime:

         return "UTC TIME";

      case ASN1_Type::GeneralizedTime:

         return "GENERALIZED TIME";

      case ASN1_Type::OctetString:

         return "OCTET STRING";

      case ASN1_Type::BitString:

         return "BIT STRING";

      case ASN1_Type::Enumerated:

         return "ENUMERATED";

      case ASN1_Type::Integer:

         return "INTEGER";

      case ASN1_Type::Null:

         return "NULL";

      case ASN1_Type::ObjectId:

         return "OBJECT";

      case ASN1_Type::Boolean:

         return "BOOLEAN";

      case ASN1_Type::NoObject:

         return "NO_OBJECT";

      default:

         return "TAG(" + std::to_string(static_cast<uint32_t>(type)) + ")";

   }

}

/*

* BER Decoding Exceptions

*/

BER_Decoding_Error::BER_Decoding_Error(std::string_view str) : Decoding_Error(fmt("BER: {}", str)) {}

BER_Bad_Tag::BER_Bad_Tag(std::string_view str, uint32_t tagging) : BER_Decoding_Error(fmt("{}: {}", str, tagging)) {}

namespace ASN1 {

/*

* Put some arbitrary bytes into a SEQUENCE

*/

std::vector<uint8_t> put_in_sequence(const std::vector<uint8_t>& contents) {

   return ASN1::put_in_sequence(contents.data(), contents.size());

}

std::vector<uint8_t> put_in_sequence(const uint8_t bits[], size_t len) {

   std::vector<uint8_t> output;

   DER_Encoder(output).start_sequence().raw_bytes(bits, len).end_cons();

   return output;

}

/*

* Convert a BER object into a string object

*/

std::string to_string(const BER_Object& obj) { return std::string(cast_uint8_ptr_to_char(obj.bits()), obj.length()); }

/*

* Do heuristic tests for BER data

*/

bool maybe_BER(DataSource& source) {

   uint8_t first_u8;

   if(!source.peek_byte(first_u8)) {

      BOTAN_ASSERT_EQUAL(source.read_byte(first_u8), 0, "Expected EOF");

      throw Stream_IO_Error("ASN1::maybe_BER: Source was empty");

   }

   const auto cons_seq = static_cast<uint8_t>(ASN1_Class::Constructed) | static_cast<uint8_t>(ASN1_Type::Sequence);

   if(first_u8 == cons_seq) {

      return true;

   }

   return false;

}

}  // namespace ASN1

}  // namespace Botan