8#include <botan/base64.h>
9#include <botan/internal/codec_base.h>
10#include <botan/exceptn.h>
11#include <botan/internal/rounding.h>
12#include <botan/internal/ct_utils.h>
21 static inline std::string
name() noexcept
26 static inline size_t encoding_bytes_in() noexcept
28 return m_encoding_bytes_in;
30 static inline size_t encoding_bytes_out() noexcept
32 return m_encoding_bytes_out;
35 static inline size_t decoding_bytes_in() noexcept
37 return m_encoding_bytes_out;
39 static inline size_t decoding_bytes_out() noexcept
41 return m_encoding_bytes_in;
44 static inline size_t bits_consumed() noexcept
46 return m_encoding_bits;
48 static inline size_t remaining_bits_before_padding() noexcept
50 return m_remaining_bits_before_padding;
53 static inline size_t encode_max_output(
size_t input_length)
55 return (
round_up(input_length, m_encoding_bytes_in) / m_encoding_bytes_in) * m_encoding_bytes_out;
57 static inline size_t decode_max_output(
size_t input_length)
59 return (
round_up(input_length, m_encoding_bytes_out) * m_encoding_bytes_in) / m_encoding_bytes_out;
62 static void encode(
char out[8],
const uint8_t in[5])
noexcept;
64 static uint8_t lookup_binary_value(
char input)
noexcept;
66 static bool check_bad_char(uint8_t bin,
char input,
bool ignore_ws);
68 static void decode(uint8_t* out_ptr,
const uint8_t decode_buf[4])
70 out_ptr[0] = (decode_buf[0] << 2) | (decode_buf[1] >> 4);
71 out_ptr[1] = (decode_buf[1] << 4) | (decode_buf[2] >> 2);
72 out_ptr[2] = (decode_buf[2] << 6) | decode_buf[3];
75 static inline size_t bytes_to_remove(
size_t final_truncate)
77 return final_truncate;
81 static const size_t m_encoding_bits = 6;
82 static const size_t m_remaining_bits_before_padding = 8;
84 static const size_t m_encoding_bytes_in = 3;
85 static const size_t m_encoding_bytes_out = 4;
88char lookup_base64_char(uint8_t x)
97 const char c_AZ =
'A' + x;
98 const char c_az =
'a' + (x - 26);
99 const char c_09 =
'0' + (x - 2*26);
100 const char c_plus =
'+';
101 const char c_slash =
'/';
104 ret = in_az.select(c_az, ret);
105 ret = in_09.select(c_09, ret);
106 ret = eq_plus.select(c_plus, ret);
107 ret = eq_slash.select(c_slash, ret);
115 const uint8_t b0 = (in[0] & 0xFC) >> 2;
116 const uint8_t b1 = ((in[0] & 0x03) << 4) | (in[1] >> 4);
117 const uint8_t b2 = ((in[1] & 0x0F) << 2) | (in[2] >> 6);
118 const uint8_t b3 = in[2] & 0x3F;
119 out[0] = lookup_base64_char(b0);
120 out[1] = lookup_base64_char(b1);
121 out[2] = lookup_base64_char(b2);
122 out[3] = lookup_base64_char(b3);
126uint8_t Base64::lookup_binary_value(
char input)
noexcept
128 const uint8_t c =
static_cast<uint8_t
>(input);
139 uint8_t(
' '), uint8_t(
'\t'), uint8_t(
'\n'), uint8_t(
'\r')
142 const uint8_t c_upper = c - uint8_t(
'A');
143 const uint8_t c_lower = c - uint8_t(
'a') + 26;
144 const uint8_t c_decim = c - uint8_t(
'0') + 2*26;
148 ret = is_alpha_upper.select(c_upper, ret);
149 ret = is_alpha_lower.select(c_lower, ret);
150 ret = is_decimal.select(c_decim, ret);
151 ret = is_plus.select(62, ret);
152 ret = is_slash.select(63, ret);
153 ret = is_equal.select(0x81, ret);
154 ret = is_whitespace.select(0x80, ret);
160bool Base64::check_bad_char(uint8_t bin,
char input,
bool ignore_ws)
166 else if(!(bin == 0x81 || (bin == 0x80 && ignore_ws)))
168 std::string bad_char(1, input);
170 { bad_char =
"\\t"; }
171 else if(bad_char ==
"\n")
172 { bad_char =
"\\n"; }
173 else if(bad_char ==
"\r")
174 { bad_char =
"\\r"; }
176 throw Invalid_Argument(
177 std::string(
"base64_decode: invalid base64 character '") +
188 size_t& input_consumed,
191 return base_encode(Base64(), out, in, input_length, input_consumed, final_inputs);
203 size_t& input_consumed,
207 return base_decode(Base64(), out, in, input_length, input_consumed, final_inputs, ignore_ws);
219 const std::string& input,
222 return base64_decode(output, input.data(), input.length(), ignore_ws);
229 return base_decode_to_vec<secure_vector<uint8_t>>(Base64(), input, input_length, ignore_ws);
240 return Base64::encode_max_output(input_length);
245 return Base64::decode_max_output(input_length);
#define BOTAN_DEBUG_ASSERT(expr)
static Mask< T > is_equal(T x, T y)
static Mask< T > is_any_of(T v, std::initializer_list< T > accepted)
static Mask< T > is_within_range(T v, T l, T u)
int(* final)(unsigned char *, CTX *)
std::string encode(const uint8_t der[], size_t length, const std::string &label, size_t width)
secure_vector< uint8_t > decode(DataSource &source, std::string &label)
size_t base64_encode(char out[], const uint8_t in[], size_t input_length, size_t &input_consumed, bool final_inputs)
size_t base64_decode(uint8_t out[], const char in[], size_t input_length, size_t &input_consumed, bool final_inputs, bool ignore_ws)
size_t base_encode(Base &&base, char output[], const uint8_t input[], size_t input_length, size_t &input_consumed, bool final_inputs)
size_t base64_encode_max_output(size_t input_length)
size_t base64_decode_max_output(size_t input_length)
size_t base_decode(Base &&base, uint8_t output[], const char input[], size_t input_length, size_t &input_consumed, bool final_inputs, bool ignore_ws=true)
std::string base_encode_to_string(Base &&base, const uint8_t input[], size_t input_length)
std::vector< T, secure_allocator< T > > secure_vector
size_t round_up(size_t n, size_t align_to)
size_t base_decode_full(Base &&base, uint8_t output[], const char input[], size_t input_length, bool ignore_ws)