1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/*
* 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 <botan/internal/assert.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, "Did not consume all input");
BOTAN_ASSERT_EQUAL(produced, output.size(), "Did not produce right amount");
return output;
}
std::string base64_encode(const MemoryRegion<byte>& input)
{
return base64_encode(&input[0], input.size());
}
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, 0xFF, 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;
bool seen_pad = false;
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(seen_pad && bin != 0x81)
throw std::invalid_argument("base64_decode: invalid padding");
if(bin <= 0x3F)
{
decode_buf[decode_buf_pos] = bin;
decode_buf_pos += 1;
}
else if(!(final_inputs && bin == 0x81))
{
if(bin == 0x80 && ignore_ws)
continue;
std::string bad_char(1, input[i]);
if(bad_char == "\t")
bad_char = "\\t";
else if(bad_char == "\n")
bad_char = "\\n";
throw std::invalid_argument(
std::string("base64_decode: invalid base64 character '") +
bad_char + "'");
}
/*
* If we either see a pad character, or we are the the end
* of the input
*/
if(final_inputs && (bin == 0x81 || i == input_length - 1))
{
seen_pad = true;
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 = input_length - decode_buf_pos;
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);
}
SecureVector<byte> base64_decode(const char input[],
size_t input_length,
bool ignore_ws)
{
SecureVector<byte> bin(1 + (input_length * 3) / 4);
size_t written = base64_decode(&bin[0],
input,
input_length,
ignore_ws);
bin.resize(written);
return bin;
}
SecureVector<byte> base64_decode(const std::string& input,
bool ignore_ws)
{
return base64_decode(&input[0], input.size(), ignore_ws);
}
}
|
