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/*
* Base64 Encoding and Decoding
* (C) 2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/base64.h>
#include <botan/mem_ops.h>
#include <botan/internal/rounding.h>
#include <stdexcept>
namespace Botan {
namespace {
static const byte 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', '+', '/'
};
void do_base64_encode(char out[4], const byte in[3])
{
out[0] = BIN_TO_BASE64[((in[0] & 0xFC) >> 2)];
out[1] = BIN_TO_BASE64[((in[0] & 0x03) << 4) | (in[1] >> 4)];
out[2] = BIN_TO_BASE64[((in[1] & 0x0F) << 2) | (in[2] >> 6)];
out[3] = BIN_TO_BASE64[((in[2] & 0x3F) )];
}
}
size_t base64_encode(char out[],
const byte in[],
size_t input_length,
size_t& input_consumed,
bool final_inputs)
{
input_consumed = 0;
size_t input_remaining = input_length;
size_t output_produced = 0;
while(input_remaining >= 3)
{
do_base64_encode(out + output_produced, in + input_consumed);
input_consumed += 3;
output_produced += 4;
input_remaining -= 3;
}
if(final_inputs && input_remaining)
{
byte remainder[3] = { 0 };
for(size_t i = 0; i != input_remaining; ++i)
remainder[i] = in[input_consumed + i];
do_base64_encode(out + output_produced, remainder);
size_t empty_bits = 8 * (3 - input_remaining);
size_t index = output_produced + 4 - 1;
while(empty_bits >= 8)
{
out[index--] = '=';
empty_bits -= 6;
}
input_consumed += input_remaining;
output_produced += 4;
}
return output_produced;
}
std::string base64_encode(const byte input[],
size_t input_length)
{
std::string output((round_up<size_t>(input_length, 3) / 3) * 4, 0);
size_t consumed = 0;
size_t produced = base64_encode(&output[0],
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 base64_decode(byte output[],
const char input[],
size_t input_length,
size_t& input_consumed,
bool final_inputs,
bool ignore_ws)
{
/*
* Base64 Decoder Lookup Table
* Warning: assumes ASCII encodings
*/
static const byte BASE64_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, 0x3E, 0xFF, 0xFF, 0xFF, 0x3F, 0x34, 0x35,
0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 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, 0x1A, 0x1B, 0x1C,
0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26,
0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30,
0x31, 0x32, 0x33, 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 };
byte* out_ptr = output;
byte decode_buf[4];
size_t decode_buf_pos = 0;
size_t final_truncate = 0;
clear_mem(output, input_length * 3 / 4);
for(size_t i = 0; i != input_length; ++i)
{
const byte bin = BASE64_TO_BIN[static_cast<byte>(input[i])];
if(bin <= 0x3F)
{
decode_buf[decode_buf_pos] = bin;
decode_buf_pos += 1;
}
else if(!(bin == 0x81 || (bin == 0x80 && ignore_ws)))
{
std::string bad_char(1, input[i]);
if(bad_char == "\t")
bad_char = "\\t";
else if(bad_char == "\n")
bad_char = "\\n";
else if(bad_char == "\r")
bad_char = "\\r";
throw std::invalid_argument(
std::string("base64_decode: invalid base64 character '") +
bad_char + "'");
}
/*
* If we're at the end of the input, pad with 0s and truncate
*/
if(final_inputs && (i == input_length - 1))
{
if(decode_buf_pos)
{
for(size_t i = decode_buf_pos; i != 4; ++i)
decode_buf[i] = 0;
final_truncate = (4 - decode_buf_pos);
decode_buf_pos = 4;
}
}
if(decode_buf_pos == 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];
out_ptr += 3;
decode_buf_pos = 0;
input_consumed = i+1;
}
}
while(input_consumed < input_length &&
BASE64_TO_BIN[static_cast<byte>(input[input_consumed])] == 0x80)
{
++input_consumed;
}
size_t written = (out_ptr - output) - final_truncate;
return written;
}
size_t base64_decode(byte output[],
const char input[],
size_t input_length,
bool ignore_ws)
{
size_t consumed = 0;
size_t written = base64_decode(output, input, input_length,
consumed, true, ignore_ws);
if(consumed != input_length)
throw std::invalid_argument("base64_decode: input did not have full bytes");
return written;
}
size_t base64_decode(byte output[],
const std::string& input,
bool ignore_ws)
{
return base64_decode(output, &input[0], input.length(), ignore_ws);
}
secure_vector<byte> base64_decode(const char input[],
size_t input_length,
bool ignore_ws)
{
secure_vector<byte> bin((round_up<size_t>(input_length, 4) * 3) / 4);
size_t written = base64_decode(&bin[0],
input,
input_length,
ignore_ws);
bin.resize(written);
return bin;
}
secure_vector<byte> base64_decode(const std::string& input,
bool ignore_ws)
{
return base64_decode(&input[0], input.size(), ignore_ws);
}
}
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