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/*
* Base32 Encoding and Decoding
* (C) 2018 Erwan Chaussy
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/base32.h>
#include <botan/internal/codec_base.h>
#include <botan/exceptn.h>
#include <botan/internal/rounding.h>
namespace Botan {
namespace {
class Base32 final
{
public:
static inline size_t encoding_bytes_in() BOTAN_NOEXCEPT
{
return m_encoding_bytes_in;
}
static inline size_t encoding_bytes_out() BOTAN_NOEXCEPT
{
return m_encoding_bytes_out;
}
static inline size_t decoding_bytes_in() BOTAN_NOEXCEPT
{
return m_encoding_bytes_out;
}
static inline size_t decoding_bytes_out() BOTAN_NOEXCEPT
{
return m_encoding_bytes_in;
}
static inline size_t bits_consumed() BOTAN_NOEXCEPT
{
return m_encoding_bits;
}
static inline size_t remaining_bits_before_padding() BOTAN_NOEXCEPT
{
return m_remaining_bits_before_padding;
}
static inline size_t encode_max_output(size_t input_length)
{
return (round_up(input_length, m_encoding_bytes_in) / m_encoding_bytes_in) * m_encoding_bytes_out;
}
static inline size_t decode_max_output(size_t input_length)
{
return (round_up(input_length, m_encoding_bytes_out) * m_encoding_bytes_in) / m_encoding_bytes_out;
}
static void encode(char out[8], const uint8_t in[5]) BOTAN_NOEXCEPT
{
out[0] = Base32::m_bin_to_base32[(in[0] & 0xF8) >> 3];
out[1] = Base32::m_bin_to_base32[((in[0] & 0x07) << 2) | (in[1] >> 6)];
out[2] = Base32::m_bin_to_base32[((in[1] & 0x3E) >> 1)];
out[3] = Base32::m_bin_to_base32[((in[1] & 0x01) << 4) | (in[2] >> 4)];
out[4] = Base32::m_bin_to_base32[((in[2] & 0x0F) << 1) | (in[3] >> 7)];
out[5] = Base32::m_bin_to_base32[((in[3] & 0x7C) >> 2)];
out[6] = Base32::m_bin_to_base32[((in[3] & 0x03) << 3) | (in[4] >> 5)];
out[7] = Base32::m_bin_to_base32[in[4] & 0x1F];
}
static inline uint8_t lookup_binary_value(char input) BOTAN_NOEXCEPT
{
return Base32::m_base32_to_bin[static_cast<uint8_t>(input)];
}
static inline bool check_bad_char(uint8_t bin, char input, bool ignore_ws)
{
if(bin <= 0x1F)
{
return true;
}
else if(!(bin == 0x81 || (bin == 0x80 && ignore_ws)))
{
std::string bad_char(1, input);
if(bad_char == "\t")
{ bad_char = "\\t"; }
else if(bad_char == "\n")
{ bad_char = "\\n"; }
else if(bad_char == "\r")
{ bad_char = "\\r"; }
throw Invalid_Argument(
std::string("base32_decode: invalid base32 character '") +
bad_char + "'");
}
return false;
}
static void decode(uint8_t* out_ptr, const uint8_t decode_buf[8])
{
out_ptr[0] = (decode_buf[0] << 3) | (decode_buf[1] >> 2);
out_ptr[1] = (decode_buf[1] << 6) | (decode_buf[2] << 1) | (decode_buf[3] >> 4);
out_ptr[2] = (decode_buf[3] << 4) | (decode_buf[4] >> 1);
out_ptr[3] = (decode_buf[4] << 7) | (decode_buf[5] << 2) | (decode_buf[6] >> 3);
out_ptr[4] = (decode_buf[6] << 5) | decode_buf[7];
}
static inline size_t bytes_to_remove(size_t final_truncate)
{
return final_truncate ? (final_truncate / 2) + 1 : 0;
}
private:
static const size_t m_encoding_bits = 5;
static const size_t m_remaining_bits_before_padding = 6;
static const size_t m_encoding_bytes_in = 5;
static const size_t m_encoding_bytes_out = 8;
static const uint8_t m_bin_to_base32[32];
static const uint8_t m_base32_to_bin[256];
};
const uint8_t Base32::m_bin_to_base32[32] =
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'2', '3', '4', '5', '6', '7'
};
/*
* base32 Decoder Lookup Table
* Warning: assumes ASCII encodings
*/
const uint8_t Base32::m_base32_to_bin[256] =
{
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80,
0x80, 0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x81, 0xFF, 0xFF, 0xFF, 0x00, 0x01, 0x02, 0x03, 0x04,
0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E,
0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
}
size_t base32_encode(char out[],
const uint8_t in[],
size_t input_length,
size_t& input_consumed,
bool final_inputs)
{
return base_encode(Base32(), out, in, input_length, input_consumed, final_inputs);
}
std::string base32_encode(const uint8_t input[],
size_t input_length)
{
const size_t output_length = Base32::encode_max_output(input_length);
std::string output(output_length, 0);
size_t consumed = 0;
size_t produced = 0;
if(output_length > 0)
{
produced = base32_encode(&output.front(),
input, input_length,
consumed, true);
}
BOTAN_ASSERT_EQUAL(consumed, input_length, "Consumed the entire input");
BOTAN_ASSERT_EQUAL(produced, output.size(), "Produced expected size");
return output;
}
size_t base32_decode(uint8_t out[],
const char in[],
size_t input_length,
size_t& input_consumed,
bool final_inputs,
bool ignore_ws)
{
return base_decode(Base32(), out, in, input_length, input_consumed, final_inputs, ignore_ws);
}
size_t base32_decode(uint8_t output[],
const char input[],
size_t input_length,
bool ignore_ws)
{
size_t consumed = 0;
size_t written = base32_decode(output, input, input_length,
consumed, true, ignore_ws);
if(consumed != input_length)
{ throw Invalid_Argument("base32_decode: input did not have full bytes"); }
return written;
}
size_t base32_decode(uint8_t output[],
const std::string& input,
bool ignore_ws)
{
return base32_decode(output, input.data(), input.length(), ignore_ws);
}
secure_vector<uint8_t> base32_decode(const char input[],
size_t input_length,
bool ignore_ws)
{
const size_t output_length = Base32::decode_max_output(input_length);
secure_vector<uint8_t> bin(output_length);
size_t written = base32_decode(bin.data(),
input,
input_length,
ignore_ws);
bin.resize(written);
return bin;
}
secure_vector<uint8_t> base32_decode(const std::string& input,
bool ignore_ws)
{
return base32_decode(input.data(), input.size(), ignore_ws);
}
}
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