Botan::PEM_Code Namespace Reference

Functions
secure_vector< uint8_t >	decode (DataSource &source, std::string &label)
secure_vector< uint8_t >	decode (std::string_view pem, std::string &label)
secure_vector< uint8_t >	decode_check_label (DataSource &source, std::string_view label_want)
secure_vector< uint8_t >	decode_check_label (std::string_view pem, std::string_view label_want)
template<typename Alloc>
std::string	encode (const std::vector< uint8_t, Alloc > &data, std::string_view label, size_t line_width=64)
std::string	encode (const uint8_t der[], size_t length, std::string_view label, size_t width)
bool	matches (DataSource &source, std::string_view extra, size_t search_range)

Function Documentation

decode() [1/2]

secure_vector< uint8_t > Botan::PEM_Code::decode	(	DataSource &	pem,
		std::string &	label )

Decode PEM data

Parameters

pem	a datasource containing PEM encoded data
label	is set to the PEM label found for later inspection

Definition at line 62 of file pem.cpp.

                                                                    {
   const size_t RANDOM_CHAR_LIMIT = 8;
 
   label.clear();
 
   const std::string PEM_HEADER1 = "-----BEGIN ";
   const std::string PEM_HEADER2 = "-----";
   size_t position = 0;
 
   while(position != PEM_HEADER1.length()) {
      auto b = source.read_byte();
 
      if(!b) {
         throw Decoding_Error("PEM: No PEM header found");
      }
      if(static_cast<char>(*b) == PEM_HEADER1[position]) {
         ++position;
      } else if(position >= RANDOM_CHAR_LIMIT) {
         throw Decoding_Error("PEM: Malformed PEM header");
      } else {
         position = 0;
      }
   }
   position = 0;
   while(position != PEM_HEADER2.length()) {
      auto b = source.read_byte();
 
      if(!b) {
         throw Decoding_Error("PEM: No PEM header found");
      }
      if(static_cast<char>(*b) == PEM_HEADER2[position]) {
         ++position;
      } else if(position > 0) {
         throw Decoding_Error("PEM: Malformed PEM header");
      }
 
      if(position == 0) {
         label += static_cast<char>(*b);
      }
   }
 
   std::vector<char> b64;
 
   const std::string PEM_TRAILER = fmt("-----END {}-----", label);
   position = 0;
   while(position != PEM_TRAILER.length()) {
      auto b = source.read_byte();
 
      if(!b) {
         throw Decoding_Error("PEM: No PEM trailer found");
      }
      if(static_cast<char>(*b) == PEM_TRAILER[position]) {
         ++position;
      } else if(position > 0) {
         throw Decoding_Error("PEM: Malformed PEM trailer");
      }
 
      if(position == 0) {
         b64.push_back(*b);
      }
   }
 
   return base64_decode(b64.data(), b64.size());
}

References Botan::base64_decode(), Botan::fmt(), and Botan::DataSource::read_byte().

Referenced by decode(), decode_check_label(), Botan::DL_Group::DL_Group(), Botan::DL_Group::from_PEM(), and Botan::X509_Object::load_data().

decode() [2/2]

secure_vector< uint8_t > Botan::PEM_Code::decode	(	std::string_view	pem,
		std::string &	label )

Decode PEM data

Parameters

pem	a string containing PEM encoded data
label	is set to the PEM label found for later inspection

Definition at line 132 of file pem.cpp.

                                                                    {
   DataSource_Memory src(pem);
   return decode(src, label);
}

References decode().

decode_check_label() [1/2]

secure_vector< uint8_t > Botan::PEM_Code::decode_check_label	(	DataSource &	pem,
		std::string_view	label )

Decode PEM data

Parameters

pem	a datasource containing PEM encoded data
label	is what we expect the label to be

Definition at line 49 of file pem.cpp.

                                                                                         {
   std::string label_got;
   secure_vector<uint8_t> ber = decode(source, label_got);
   if(label_got != label_want) {
      throw Decoding_Error(fmt("PEM: Label mismatch, wanted '{}' got '{}'", label_want, label_got));
   }
 
   return ber;
}

References decode(), and Botan::fmt().

Referenced by decode_check_label(), Botan::CryptoBox::decrypt_bin(), Botan::EC_Group::EC_Group(), Botan::EC_Group::from_PEM(), and Botan::X509::load_key().

decode_check_label() [2/2]

secure_vector< uint8_t > Botan::PEM_Code::decode_check_label	(	std::string_view	pem,
		std::string_view	label )

Decode PEM data

Parameters

pem	a string containing PEM encoded data
label	is what we expect the label to be

Definition at line 127 of file pem.cpp.

                                                                                         {
   DataSource_Memory src(pem);
   return decode_check_label(src, label_want);
}

References decode_check_label().

encode() [1/2]

template<typename Alloc>

std::string Botan::PEM_Code::encode	(	const std::vector< uint8_t, Alloc > &	data,
		std::string_view	label,
		size_t	line_width = 64 )

Encode some binary data in PEM format

Parameters

data	binary data to encode
label	PEM label
line_width	after this many characters, a new line is inserted

Definition at line 38 of file pem.h.

                                                                                                      {
   return encode(data.data(), data.size(), label, line_width);
}

References encode().

encode() [2/2]

std::string Botan::PEM_Code::encode	(	const uint8_t	data[],
		size_t	data_len,
		std::string_view	label,
		size_t	line_width = 64 )

Encode some binary data in PEM format

Parameters

data	binary data to encode
data_len	length of binary data in bytes
label	PEM label put after BEGIN and END
line_width	after this many characters, a new line is inserted

Definition at line 39 of file pem.cpp.

                                                                                         {
   const std::string PEM_HEADER = fmt("-----BEGIN {}-----\n", label);
   const std::string PEM_TRAILER = fmt("-----END {}-----\n", label);
 
   return (PEM_HEADER + linewrap(width, base64_encode(der, length)) + PEM_TRAILER);
}

References Botan::base64_encode(), and Botan::fmt().

Referenced by botan_privkey_rsa_get_privkey(), encode(), Botan::CryptoBox::encrypt(), Botan::DL_Group::PEM_encode(), Botan::EC_Group::PEM_encode(), Botan::PKCS8::PEM_encode(), Botan::PKCS8::PEM_encode(), Botan::TLS::Session::PEM_encode(), Botan::X509::PEM_encode(), Botan::X509_Object::PEM_encode(), Botan::PKCS8::PEM_encode_encrypted_pbkdf_iter(), and Botan::PKCS8::PEM_encode_encrypted_pbkdf_msec().

matches()

bool Botan::PEM_Code::matches	(	DataSource &	source,
		std::string_view	extra = "",
		size_t	search_range = 4096 )

Heuristic test for PEM data.

Definition at line 140 of file pem.cpp.

                                                                            {
   const std::string PEM_HEADER = fmt("-----BEGIN {}", extra);
 
   secure_vector<uint8_t> search_buf(search_range);
   const size_t got = source.peek(search_buf.data(), search_buf.size(), 0);
 
   if(got < PEM_HEADER.length()) {
      return false;
   }
 
   size_t index = 0;
 
   for(size_t j = 0; j != got; ++j) {
      if(static_cast<char>(search_buf[j]) == PEM_HEADER[index]) {
         ++index;
      } else {
         index = 0;
      }
 
      if(index == PEM_HEADER.size()) {
         return true;
      }
   }
 
   return false;
}

References Botan::fmt(), and Botan::DataSource::peek().

Referenced by Botan::X509_Object::load_data(), and Botan::X509::load_key().