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
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
|
/*
* Load/Store Operators
* (C) 1999-2007 Jack Lloyd
* 2007 Yves Jerschow
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_LOAD_STORE_H__
#define BOTAN_LOAD_STORE_H__
#include <botan/types.h>
#include <botan/bswap.h>
#include <cstring>
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
#if defined(BOTAN_TARGET_CPU_IS_BIG_ENDIAN)
#define BOTAN_ENDIAN_N2B(x) (x)
#define BOTAN_ENDIAN_B2N(x) (x)
#define BOTAN_ENDIAN_N2L(x) reverse_bytes(x)
#define BOTAN_ENDIAN_L2N(x) reverse_bytes(x)
#elif defined(BOTAN_TARGET_CPU_IS_LITTLE_ENDIAN)
#define BOTAN_ENDIAN_N2L(x) (x)
#define BOTAN_ENDIAN_L2N(x) (x)
#define BOTAN_ENDIAN_N2B(x) reverse_bytes(x)
#define BOTAN_ENDIAN_B2N(x) reverse_bytes(x)
#endif
#endif
namespace Botan {
/*
* Byte Extraction Function
*/
template<typename T> inline byte get_byte(u32bit byte_num, T input)
{
return (input >> ((sizeof(T)-1-(byte_num&(sizeof(T)-1))) << 3));
}
/*
* Byte to Word Conversions
*/
inline u16bit make_u16bit(byte i0, byte i1)
{
return ((static_cast<u16bit>(i0) << 8) | i1);
}
inline u32bit make_u32bit(byte i0, byte i1, byte i2, byte i3)
{
return ((static_cast<u32bit>(i0) << 24) |
(static_cast<u32bit>(i1) << 16) |
(static_cast<u32bit>(i2) << 8) |
(static_cast<u32bit>(i3)));
}
inline u64bit make_u64bit(byte i0, byte i1, byte i2, byte i3,
byte i4, byte i5, byte i6, byte i7)
{
return ((static_cast<u64bit>(i0) << 56) |
(static_cast<u64bit>(i1) << 48) |
(static_cast<u64bit>(i2) << 40) |
(static_cast<u64bit>(i3) << 32) |
(static_cast<u64bit>(i4) << 24) |
(static_cast<u64bit>(i5) << 16) |
(static_cast<u64bit>(i6) << 8) |
(static_cast<u64bit>(i7)));
}
/*
* Endian-Specific Word Loading Operations
*/
template<typename T>
inline T load_be(const byte in[], u32bit off)
{
in += off * sizeof(T);
T out = 0;
for(u32bit j = 0; j != sizeof(T); j++)
out = (out << 8) | in[j];
return out;
}
template<typename T>
inline T load_le(const byte in[], u32bit off)
{
in += off * sizeof(T);
T out = 0;
for(u32bit j = 0; j != sizeof(T); j++)
out = (out << 8) | in[sizeof(T)-1-j];
return out;
}
template<>
inline u16bit load_be<u16bit>(const byte in[], u32bit off)
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
return BOTAN_ENDIAN_N2B(*(reinterpret_cast<const u16bit*>(in) + off));
#else
in += off * sizeof(u16bit);
return make_u16bit(in[0], in[1]);
#endif
}
template<>
inline u16bit load_le<u16bit>(const byte in[], u32bit off)
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
return BOTAN_ENDIAN_N2L(*(reinterpret_cast<const u16bit*>(in) + off));
#else
in += off * sizeof(u16bit);
return make_u16bit(in[1], in[0]);
#endif
}
template<>
inline u32bit load_be<u32bit>(const byte in[], u32bit off)
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
return BOTAN_ENDIAN_N2B(*(reinterpret_cast<const u32bit*>(in) + off));
#else
in += off * sizeof(u32bit);
return make_u32bit(in[0], in[1], in[2], in[3]);
#endif
}
template<>
inline u32bit load_le<u32bit>(const byte in[], u32bit off)
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
return BOTAN_ENDIAN_N2L(*(reinterpret_cast<const u32bit*>(in) + off));
#else
in += off * sizeof(u32bit);
return make_u32bit(in[3], in[2], in[1], in[0]);
#endif
}
template<>
inline u64bit load_be<u64bit>(const byte in[], u32bit off)
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
return BOTAN_ENDIAN_N2B(*(reinterpret_cast<const u64bit*>(in) + off));
#else
in += off * sizeof(u64bit);
return make_u64bit(in[0], in[1], in[2], in[3],
in[4], in[5], in[6], in[7]);
#endif
}
template<>
inline u64bit load_le<u64bit>(const byte in[], u32bit off)
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
return BOTAN_ENDIAN_N2L(*(reinterpret_cast<const u64bit*>(in) + off));
#else
in += off * sizeof(u64bit);
return make_u64bit(in[7], in[6], in[5], in[4],
in[3], in[2], in[1], in[0]);
#endif
}
template<typename T>
inline void load_le(const byte in[], T& x0, T& x1)
{
x0 = load_le<T>(in, 0);
x1 = load_le<T>(in, 1);
}
template<typename T>
inline void load_le(const byte in[],
T& x0, T& x1, T& x2, T& x3)
{
x0 = load_le<T>(in, 0);
x1 = load_le<T>(in, 1);
x2 = load_le<T>(in, 2);
x3 = load_le<T>(in, 3);
}
template<typename T>
inline void load_le(const byte in[],
T& x0, T& x1, T& x2, T& x3,
T& x4, T& x5, T& x6, T& x7)
{
x0 = load_le<T>(in, 0);
x1 = load_le<T>(in, 1);
x2 = load_le<T>(in, 2);
x3 = load_le<T>(in, 3);
x4 = load_le<T>(in, 4);
x5 = load_le<T>(in, 5);
x6 = load_le<T>(in, 6);
x7 = load_le<T>(in, 7);
}
template<typename T>
inline void load_le(T out[],
const byte in[],
u32bit count)
{
#if defined(BOTAN_TARGET_CPU_HAS_KNOWN_ENDIANNESS)
std::memcpy(out, in, sizeof(T)*count);
#if defined(BOTAN_TARGET_CPU_IS_BIG_ENDIAN)
const u32bit blocks = count - (count % 4);
const u32bit left = count - blocks;
for(u32bit i = 0; i != blocks; i += 4)
bswap_4(out + i);
for(u32bit i = 0; i != left; ++i)
out[blocks+i] = reverse_bytes(out[blocks+i]);
#endif
#else
for(u32bit i = 0; i != count; ++i)
out[i] = load_le<T>(in, i);
#endif
}
template<typename T>
inline void load_be(const byte in[], T& x0, T& x1)
{
x0 = load_be<T>(in, 0);
x1 = load_be<T>(in, 1);
}
template<typename T>
inline void load_be(const byte in[],
T& x0, T& x1, T& x2, T& x3)
{
x0 = load_be<T>(in, 0);
x1 = load_be<T>(in, 1);
x2 = load_be<T>(in, 2);
x3 = load_be<T>(in, 3);
}
template<typename T>
inline void load_be(const byte in[],
T& x0, T& x1, T& x2, T& x3,
T& x4, T& x5, T& x6, T& x7)
{
x0 = load_be<T>(in, 0);
x1 = load_be<T>(in, 1);
x2 = load_be<T>(in, 2);
x3 = load_be<T>(in, 3);
x4 = load_be<T>(in, 4);
x5 = load_be<T>(in, 5);
x6 = load_be<T>(in, 6);
x7 = load_be<T>(in, 7);
}
template<typename T>
inline void load_be(T out[],
const byte in[],
u32bit count)
{
#if defined(BOTAN_TARGET_CPU_HAS_KNOWN_ENDIANNESS)
std::memcpy(out, in, sizeof(T)*count);
#if defined(BOTAN_TARGET_CPU_IS_LITTLE_ENDIAN)
const u32bit blocks = count - (count % 4);
const u32bit left = count - blocks;
for(u32bit i = 0; i != blocks; i += 4)
bswap_4(out + i);
for(u32bit i = 0; i != left; ++i)
out[blocks+i] = reverse_bytes(out[blocks+i]);
#endif
#else
for(u32bit i = 0; i != count; ++i)
out[i] = load_be<T>(in, i);
#endif
}
/*
* Endian-Specific Word Storing Operations
*/
inline void store_be(u16bit in, byte out[2])
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
*reinterpret_cast<u16bit*>(out) = BOTAN_ENDIAN_B2N(in);
#else
out[0] = get_byte(0, in);
out[1] = get_byte(1, in);
#endif
}
inline void store_le(u16bit in, byte out[2])
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
*reinterpret_cast<u16bit*>(out) = BOTAN_ENDIAN_L2N(in);
#else
out[0] = get_byte(1, in);
out[1] = get_byte(0, in);
#endif
}
inline void store_be(u32bit in, byte out[4])
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
*reinterpret_cast<u32bit*>(out) = BOTAN_ENDIAN_B2N(in);
#else
out[0] = get_byte(0, in);
out[1] = get_byte(1, in);
out[2] = get_byte(2, in);
out[3] = get_byte(3, in);
#endif
}
inline void store_le(u32bit in, byte out[4])
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
*reinterpret_cast<u32bit*>(out) = BOTAN_ENDIAN_L2N(in);
#else
out[0] = get_byte(3, in);
out[1] = get_byte(2, in);
out[2] = get_byte(1, in);
out[3] = get_byte(0, in);
#endif
}
inline void store_be(u64bit in, byte out[8])
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
*reinterpret_cast<u64bit*>(out) = BOTAN_ENDIAN_B2N(in);
#else
out[0] = get_byte(0, in);
out[1] = get_byte(1, in);
out[2] = get_byte(2, in);
out[3] = get_byte(3, in);
out[4] = get_byte(4, in);
out[5] = get_byte(5, in);
out[6] = get_byte(6, in);
out[7] = get_byte(7, in);
#endif
}
inline void store_le(u64bit in, byte out[8])
{
#if BOTAN_TARGET_UNALIGNED_MEMORY_ACCESS_OK
*reinterpret_cast<u64bit*>(out) = BOTAN_ENDIAN_L2N(in);
#else
out[0] = get_byte(7, in);
out[1] = get_byte(6, in);
out[2] = get_byte(5, in);
out[3] = get_byte(4, in);
out[4] = get_byte(3, in);
out[5] = get_byte(2, in);
out[6] = get_byte(1, in);
out[7] = get_byte(0, in);
#endif
}
template<typename T>
inline void store_le(byte out[], T x0, T x1)
{
store_le(x0, out + (0 * sizeof(T)));
store_le(x1, out + (1 * sizeof(T)));
}
template<typename T>
inline void store_be(byte out[], T x0, T x1)
{
store_be(x0, out + (0 * sizeof(T)));
store_be(x1, out + (1 * sizeof(T)));
}
template<typename T>
inline void store_le(byte out[], T x0, T x1, T x2, T x3)
{
store_le(x0, out + (0 * sizeof(T)));
store_le(x1, out + (1 * sizeof(T)));
store_le(x2, out + (2 * sizeof(T)));
store_le(x3, out + (3 * sizeof(T)));
}
template<typename T>
inline void store_be(byte out[], T x0, T x1, T x2, T x3)
{
store_be(x0, out + (0 * sizeof(T)));
store_be(x1, out + (1 * sizeof(T)));
store_be(x2, out + (2 * sizeof(T)));
store_be(x3, out + (3 * sizeof(T)));
}
template<typename T>
inline void store_le(byte out[], T x0, T x1, T x2, T x3,
T x4, T x5, T x6, T x7)
{
store_le(x0, out + (0 * sizeof(T)));
store_le(x1, out + (1 * sizeof(T)));
store_le(x2, out + (2 * sizeof(T)));
store_le(x3, out + (3 * sizeof(T)));
store_le(x4, out + (4 * sizeof(T)));
store_le(x5, out + (5 * sizeof(T)));
store_le(x6, out + (6 * sizeof(T)));
store_le(x7, out + (7 * sizeof(T)));
}
template<typename T>
inline void store_be(byte out[], T x0, T x1, T x2, T x3,
T x4, T x5, T x6, T x7)
{
store_be(x0, out + (0 * sizeof(T)));
store_be(x1, out + (1 * sizeof(T)));
store_be(x2, out + (2 * sizeof(T)));
store_be(x3, out + (3 * sizeof(T)));
store_be(x4, out + (4 * sizeof(T)));
store_be(x5, out + (5 * sizeof(T)));
store_be(x6, out + (6 * sizeof(T)));
store_be(x7, out + (7 * sizeof(T)));
}
}
#endif
|
