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/*
* OpenPGP Codec
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/openpgp.h>
#include <botan/filters.h>
#include <botan/basefilt.h>
#include <botan/charset.h>
#include <botan/crc24.h>
namespace Botan {
/*
* OpenPGP Base64 encoding
*/
std::string PGP_encode(
const byte input[], size_t length,
const std::string& label,
const std::map<std::string, std::string>& headers)
{
const std::string PGP_HEADER = "-----BEGIN PGP " + label + "-----\n";
const std::string PGP_TRAILER = "-----END PGP " + label + "-----\n";
const size_t PGP_WIDTH = 64;
std::string pgp_encoded = PGP_HEADER;
if(headers.find("Version") != headers.end())
pgp_encoded += "Version: " + headers.find("Version")->second + '\n';
std::map<std::string, std::string>::const_iterator i = headers.begin();
while(i != headers.end())
{
if(i->first != "Version")
pgp_encoded += i->first + ": " + i->second + '\n';
++i;
}
pgp_encoded += '\n';
Pipe pipe(new Fork(
new Base64_Encoder(true, PGP_WIDTH),
new Chain(new Hash_Filter(new CRC24), new Base64_Encoder)
)
);
pipe.process_msg(input, length);
pgp_encoded += pipe.read_all_as_string(0);
pgp_encoded += '=' + pipe.read_all_as_string(1) + '\n';
pgp_encoded += PGP_TRAILER;
return pgp_encoded;
}
/*
* OpenPGP Base64 encoding
*/
std::string PGP_encode(const byte input[], size_t length,
const std::string& type)
{
std::map<std::string, std::string> empty;
return PGP_encode(input, length, type, empty);
}
/*
* OpenPGP Base64 decoding
*/
secure_vector<byte> PGP_decode(DataSource& source,
std::string& label,
std::map<std::string, std::string>& headers)
{
const size_t RANDOM_CHAR_LIMIT = 5;
const std::string PGP_HEADER1 = "-----BEGIN PGP ";
const std::string PGP_HEADER2 = "-----";
size_t position = 0;
while(position != PGP_HEADER1.length())
{
byte b;
if(!source.read_byte(b))
throw Decoding_Error("PGP: No PGP header found");
if(b == PGP_HEADER1[position])
++position;
else if(position >= RANDOM_CHAR_LIMIT)
throw Decoding_Error("PGP: Malformed PGP header");
else
position = 0;
}
position = 0;
while(position != PGP_HEADER2.length())
{
byte b;
if(!source.read_byte(b))
throw Decoding_Error("PGP: No PGP header found");
if(b == PGP_HEADER2[position])
++position;
else if(position)
throw Decoding_Error("PGP: Malformed PGP header");
if(position == 0)
label += static_cast<char>(b);
}
headers.clear();
bool end_of_headers = false;
while(!end_of_headers)
{
std::string this_header;
byte b = 0;
while(b != '\n')
{
if(!source.read_byte(b))
throw Decoding_Error("PGP: Bad armor header");
if(b != '\n')
this_header += static_cast<char>(b);
}
end_of_headers = true;
for(size_t j = 0; j != this_header.length(); ++j)
if(!Charset::is_space(this_header[j]))
end_of_headers = false;
if(!end_of_headers)
{
std::string::size_type pos = this_header.find(": ");
if(pos == std::string::npos)
throw Decoding_Error("OpenPGP: Bad headers");
std::string key = this_header.substr(0, pos);
std::string value = this_header.substr(pos + 2, std::string::npos);
headers[key] = value;
}
}
Pipe base64(new Base64_Decoder,
new Fork(nullptr,
new Chain(new Hash_Filter(new CRC24),
new Base64_Encoder)
)
);
base64.start_msg();
const std::string PGP_TRAILER = "-----END PGP " + label + "-----";
position = 0;
bool newline_seen = 0;
std::string crc;
while(position != PGP_TRAILER.length())
{
byte b;
if(!source.read_byte(b))
throw Decoding_Error("PGP: No PGP trailer found");
if(b == PGP_TRAILER[position])
++position;
else if(position)
throw Decoding_Error("PGP: Malformed PGP trailer");
if(b == '=' && newline_seen)
{
while(b != '\n')
{
if(!source.read_byte(b))
throw Decoding_Error("PGP: Bad CRC tail");
if(b != '\n')
crc += static_cast<char>(b);
}
}
else if(b == '\n')
newline_seen = true;
else if(position == 0)
{
base64.write(b);
newline_seen = false;
}
}
base64.end_msg();
if(crc != "" && crc != base64.read_all_as_string(1))
throw Decoding_Error("PGP: Corrupt CRC");
return base64.read_all();
}
/*
* OpenPGP Base64 decoding
*/
secure_vector<byte> PGP_decode(DataSource& source, std::string& label)
{
std::map<std::string, std::string> ignored;
return PGP_decode(source, label, ignored);
}
}
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