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/*
* Base64 Encoding and Decoding
* (C) 2010,2015,2020 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/base64.h>
#include <botan/internal/codec_base.h>
#include <botan/exceptn.h>
#include <botan/internal/rounding.h>
#include <botan/internal/ct_utils.h>
namespace Botan {
namespace {
class Base64 final
{
public:
static inline std::string name() noexcept
{
return "base64";
}
static inline size_t encoding_bytes_in() noexcept
{
return m_encoding_bytes_in;
}
static inline size_t encoding_bytes_out() noexcept
{
return m_encoding_bytes_out;
}
static inline size_t decoding_bytes_in() noexcept
{
return m_encoding_bytes_out;
}
static inline size_t decoding_bytes_out() noexcept
{
return m_encoding_bytes_in;
}
static inline size_t bits_consumed() noexcept
{
return m_encoding_bits;
}
static inline size_t remaining_bits_before_padding() 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]) noexcept;
static uint8_t lookup_binary_value(char input) noexcept;
static bool check_bad_char(uint8_t bin, char input, bool ignore_ws);
static void decode(uint8_t* out_ptr, const uint8_t decode_buf[4])
{
out_ptr[0] = (decode_buf[0] << 2) | (decode_buf[1] >> 4);
out_ptr[1] = (decode_buf[1] << 4) | (decode_buf[2] >> 2);
out_ptr[2] = (decode_buf[2] << 6) | decode_buf[3];
}
static inline size_t bytes_to_remove(size_t final_truncate)
{
return final_truncate;
}
private:
static const size_t m_encoding_bits = 6;
static const size_t m_remaining_bits_before_padding = 8;
static const size_t m_encoding_bytes_in = 3;
static const size_t m_encoding_bytes_out = 4;
};
//static
void Base64::encode(char out[8], const uint8_t in[5]) noexcept
{
alignas(64) static const uint8_t BIN_TO_BASE64[64] = {
'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',
'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',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
const uint8_t b0 = (in[0] & 0xFC) >> 2;
const uint8_t b1 = ((in[0] & 0x03) << 4) | (in[1] >> 4);
const uint8_t b2 = ((in[1] & 0x0F) << 2) | (in[2] >> 6);
const uint8_t b3 = in[2] & 0x3F;
out[0] = BIN_TO_BASE64[b0];
out[1] = BIN_TO_BASE64[b1];
out[2] = BIN_TO_BASE64[b2];
out[3] = BIN_TO_BASE64[b3];
}
//static
uint8_t Base64::lookup_binary_value(char input) noexcept
{
const uint8_t c = static_cast<uint8_t>(input);
const auto is_alpha_upper = CT::Mask<uint8_t>::is_within_range(c, uint8_t('A'), uint8_t('Z'));
const auto is_alpha_lower = CT::Mask<uint8_t>::is_within_range(c, uint8_t('a'), uint8_t('z'));
const auto is_decimal = CT::Mask<uint8_t>::is_within_range(c, uint8_t('0'), uint8_t('9'));
const auto is_plus = CT::Mask<uint8_t>::is_equal(c, uint8_t('+'));
const auto is_slash = CT::Mask<uint8_t>::is_equal(c, uint8_t('/'));
const auto is_equal = CT::Mask<uint8_t>::is_equal(c, uint8_t('='));
const auto is_whitespace = CT::Mask<uint8_t>::is_any_of(c, {
uint8_t(' '), uint8_t('\t'), uint8_t('\n'), uint8_t('\r')
});
const uint8_t c_upper = c - uint8_t('A');
const uint8_t c_lower = c - uint8_t('a') + 26;
const uint8_t c_decim = c - uint8_t('0') + 2*26;
uint8_t ret = 0xFF; // default value
ret = is_alpha_upper.select(c_upper, ret);
ret = is_alpha_lower.select(c_lower, ret);
ret = is_decimal.select(c_decim, ret);
ret = is_plus.select(62, ret);
ret = is_slash.select(63, ret);
ret = is_equal.select(0x81, ret);
ret = is_whitespace.select(0x80, ret);
return ret;
}
//static
bool Base64::check_bad_char(uint8_t bin, char input, bool ignore_ws)
{
if(bin <= 0x3F)
{
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("base64_decode: invalid base64 character '") +
bad_char + "'");
}
return false;
}
}
size_t base64_encode(char out[],
const uint8_t in[],
size_t input_length,
size_t& input_consumed,
bool final_inputs)
{
return base_encode(Base64(), out, in, input_length, input_consumed, final_inputs);
}
std::string base64_encode(const uint8_t input[],
size_t input_length)
{
return base_encode_to_string(Base64(), input, input_length);
}
size_t base64_decode(uint8_t out[],
const char in[],
size_t input_length,
size_t& input_consumed,
bool final_inputs,
bool ignore_ws)
{
return base_decode(Base64(), out, in, input_length, input_consumed, final_inputs, ignore_ws);
}
size_t base64_decode(uint8_t output[],
const char input[],
size_t input_length,
bool ignore_ws)
{
return base_decode_full(Base64(), output, input, input_length, ignore_ws);
}
size_t base64_decode(uint8_t output[],
const std::string& input,
bool ignore_ws)
{
return base64_decode(output, input.data(), input.length(), ignore_ws);
}
secure_vector<uint8_t> base64_decode(const char input[],
size_t input_length,
bool ignore_ws)
{
return base_decode_to_vec<secure_vector<uint8_t>>(Base64(), input, input_length, ignore_ws);
}
secure_vector<uint8_t> base64_decode(const std::string& input,
bool ignore_ws)
{
return base64_decode(input.data(), input.size(), ignore_ws);
}
size_t base64_encode_max_output(size_t input_length)
{
return Base64::encode_max_output(input_length);
}
size_t base64_decode_max_output(size_t input_length)
{
return Base64::decode_max_output(input_length);
}
}
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