1/*
2 * Copyright 2010-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <string.h>
11#include <openssl/crypto.h>
12#include "internal/cryptlib.h"
13#include "crypto/modes.h"
14
15#if defined(BSWAP4) && defined(STRICT_ALIGNMENT)
16/* redefine, because alignment is ensured */
17# undef GETU32
18# define GETU32(p) BSWAP4(*(const u32 *)(p))
19# undef PUTU32
20# define PUTU32(p,v) *(u32 *)(p) = BSWAP4(v)
21#endif
22
23#define PACK(s) ((size_t)(s)<<(sizeof(size_t)*8-16))
24#define REDUCE1BIT(V) do { \
25 if (sizeof(size_t)==8) { \
26 u64 T = U64(0xe100000000000000) & (0-(V.lo&1)); \
27 V.lo = (V.hi<<63)|(V.lo>>1); \
28 V.hi = (V.hi>>1 )^T; \
29 } \
30 else { \
31 u32 T = 0xe1000000U & (0-(u32)(V.lo&1)); \
32 V.lo = (V.hi<<63)|(V.lo>>1); \
33 V.hi = (V.hi>>1 )^((u64)T<<32); \
34 } \
35} while(0)
36
37/*-
38 * Even though permitted values for TABLE_BITS are 8, 4 and 1, it should
39 * never be set to 8. 8 is effectively reserved for testing purposes.
40 * TABLE_BITS>1 are lookup-table-driven implementations referred to as
41 * "Shoup's" in GCM specification. In other words OpenSSL does not cover
42 * whole spectrum of possible table driven implementations. Why? In
43 * non-"Shoup's" case memory access pattern is segmented in such manner,
44 * that it's trivial to see that cache timing information can reveal
45 * fair portion of intermediate hash value. Given that ciphertext is
46 * always available to attacker, it's possible for him to attempt to
47 * deduce secret parameter H and if successful, tamper with messages
48 * [which is nothing but trivial in CTR mode]. In "Shoup's" case it's
49 * not as trivial, but there is no reason to believe that it's resistant
50 * to cache-timing attack. And the thing about "8-bit" implementation is
51 * that it consumes 16 (sixteen) times more memory, 4KB per individual
52 * key + 1KB shared. Well, on pros side it should be twice as fast as
53 * "4-bit" version. And for gcc-generated x86[_64] code, "8-bit" version
54 * was observed to run ~75% faster, closer to 100% for commercial
55 * compilers... Yet "4-bit" procedure is preferred, because it's
56 * believed to provide better security-performance balance and adequate
57 * all-round performance. "All-round" refers to things like:
58 *
59 * - shorter setup time effectively improves overall timing for
60 * handling short messages;
61 * - larger table allocation can become unbearable because of VM
62 * subsystem penalties (for example on Windows large enough free
63 * results in VM working set trimming, meaning that consequent
64 * malloc would immediately incur working set expansion);
65 * - larger table has larger cache footprint, which can affect
66 * performance of other code paths (not necessarily even from same
67 * thread in Hyper-Threading world);
68 *
69 * Value of 1 is not appropriate for performance reasons.
70 */
71#if TABLE_BITS==8
72
73static void gcm_init_8bit(u128 Htable[256], u64 H[2])
74{
75 int i, j;
76 u128 V;
77
78 Htable[0].hi = 0;
79 Htable[0].lo = 0;
80 V.hi = H[0];
81 V.lo = H[1];
82
83 for (Htable[128] = V, i = 64; i > 0; i >>= 1) {
84 REDUCE1BIT(V);
85 Htable[i] = V;
86 }
87
88 for (i = 2; i < 256; i <<= 1) {
89 u128 *Hi = Htable + i, H0 = *Hi;
90 for (j = 1; j < i; ++j) {
91 Hi[j].hi = H0.hi ^ Htable[j].hi;
92 Hi[j].lo = H0.lo ^ Htable[j].lo;
93 }
94 }
95}
96
97static void gcm_gmult_8bit(u64 Xi[2], const u128 Htable[256])
98{
99 u128 Z = { 0, 0 };
100 const u8 *xi = (const u8 *)Xi + 15;
101 size_t rem, n = *xi;
102 const union {
103 long one;
104 char little;
105 } is_endian = { 1 };
106 static const size_t rem_8bit[256] = {
107 PACK(0x0000), PACK(0x01C2), PACK(0x0384), PACK(0x0246),
108 PACK(0x0708), PACK(0x06CA), PACK(0x048C), PACK(0x054E),
109 PACK(0x0E10), PACK(0x0FD2), PACK(0x0D94), PACK(0x0C56),
110 PACK(0x0918), PACK(0x08DA), PACK(0x0A9C), PACK(0x0B5E),
111 PACK(0x1C20), PACK(0x1DE2), PACK(0x1FA4), PACK(0x1E66),
112 PACK(0x1B28), PACK(0x1AEA), PACK(0x18AC), PACK(0x196E),
113 PACK(0x1230), PACK(0x13F2), PACK(0x11B4), PACK(0x1076),
114 PACK(0x1538), PACK(0x14FA), PACK(0x16BC), PACK(0x177E),
115 PACK(0x3840), PACK(0x3982), PACK(0x3BC4), PACK(0x3A06),
116 PACK(0x3F48), PACK(0x3E8A), PACK(0x3CCC), PACK(0x3D0E),
117 PACK(0x3650), PACK(0x3792), PACK(0x35D4), PACK(0x3416),
118 PACK(0x3158), PACK(0x309A), PACK(0x32DC), PACK(0x331E),
119 PACK(0x2460), PACK(0x25A2), PACK(0x27E4), PACK(0x2626),
120 PACK(0x2368), PACK(0x22AA), PACK(0x20EC), PACK(0x212E),
121 PACK(0x2A70), PACK(0x2BB2), PACK(0x29F4), PACK(0x2836),
122 PACK(0x2D78), PACK(0x2CBA), PACK(0x2EFC), PACK(0x2F3E),
123 PACK(0x7080), PACK(0x7142), PACK(0x7304), PACK(0x72C6),
124 PACK(0x7788), PACK(0x764A), PACK(0x740C), PACK(0x75CE),
125 PACK(0x7E90), PACK(0x7F52), PACK(0x7D14), PACK(0x7CD6),
126 PACK(0x7998), PACK(0x785A), PACK(0x7A1C), PACK(0x7BDE),
127 PACK(0x6CA0), PACK(0x6D62), PACK(0x6F24), PACK(0x6EE6),
128 PACK(0x6BA8), PACK(0x6A6A), PACK(0x682C), PACK(0x69EE),
129 PACK(0x62B0), PACK(0x6372), PACK(0x6134), PACK(0x60F6),
130 PACK(0x65B8), PACK(0x647A), PACK(0x663C), PACK(0x67FE),
131 PACK(0x48C0), PACK(0x4902), PACK(0x4B44), PACK(0x4A86),
132 PACK(0x4FC8), PACK(0x4E0A), PACK(0x4C4C), PACK(0x4D8E),
133 PACK(0x46D0), PACK(0x4712), PACK(0x4554), PACK(0x4496),
134 PACK(0x41D8), PACK(0x401A), PACK(0x425C), PACK(0x439E),
135 PACK(0x54E0), PACK(0x5522), PACK(0x5764), PACK(0x56A6),
136 PACK(0x53E8), PACK(0x522A), PACK(0x506C), PACK(0x51AE),
137 PACK(0x5AF0), PACK(0x5B32), PACK(0x5974), PACK(0x58B6),
138 PACK(0x5DF8), PACK(0x5C3A), PACK(0x5E7C), PACK(0x5FBE),
139 PACK(0xE100), PACK(0xE0C2), PACK(0xE284), PACK(0xE346),
140 PACK(0xE608), PACK(0xE7CA), PACK(0xE58C), PACK(0xE44E),
141 PACK(0xEF10), PACK(0xEED2), PACK(0xEC94), PACK(0xED56),
142 PACK(0xE818), PACK(0xE9DA), PACK(0xEB9C), PACK(0xEA5E),
143 PACK(0xFD20), PACK(0xFCE2), PACK(0xFEA4), PACK(0xFF66),
144 PACK(0xFA28), PACK(0xFBEA), PACK(0xF9AC), PACK(0xF86E),
145 PACK(0xF330), PACK(0xF2F2), PACK(0xF0B4), PACK(0xF176),
146 PACK(0xF438), PACK(0xF5FA), PACK(0xF7BC), PACK(0xF67E),
147 PACK(0xD940), PACK(0xD882), PACK(0xDAC4), PACK(0xDB06),
148 PACK(0xDE48), PACK(0xDF8A), PACK(0xDDCC), PACK(0xDC0E),
149 PACK(0xD750), PACK(0xD692), PACK(0xD4D4), PACK(0xD516),
150 PACK(0xD058), PACK(0xD19A), PACK(0xD3DC), PACK(0xD21E),
151 PACK(0xC560), PACK(0xC4A2), PACK(0xC6E4), PACK(0xC726),
152 PACK(0xC268), PACK(0xC3AA), PACK(0xC1EC), PACK(0xC02E),
153 PACK(0xCB70), PACK(0xCAB2), PACK(0xC8F4), PACK(0xC936),
154 PACK(0xCC78), PACK(0xCDBA), PACK(0xCFFC), PACK(0xCE3E),
155 PACK(0x9180), PACK(0x9042), PACK(0x9204), PACK(0x93C6),
156 PACK(0x9688), PACK(0x974A), PACK(0x950C), PACK(0x94CE),
157 PACK(0x9F90), PACK(0x9E52), PACK(0x9C14), PACK(0x9DD6),
158 PACK(0x9898), PACK(0x995A), PACK(0x9B1C), PACK(0x9ADE),
159 PACK(0x8DA0), PACK(0x8C62), PACK(0x8E24), PACK(0x8FE6),
160 PACK(0x8AA8), PACK(0x8B6A), PACK(0x892C), PACK(0x88EE),
161 PACK(0x83B0), PACK(0x8272), PACK(0x8034), PACK(0x81F6),
162 PACK(0x84B8), PACK(0x857A), PACK(0x873C), PACK(0x86FE),
163 PACK(0xA9C0), PACK(0xA802), PACK(0xAA44), PACK(0xAB86),
164 PACK(0xAEC8), PACK(0xAF0A), PACK(0xAD4C), PACK(0xAC8E),
165 PACK(0xA7D0), PACK(0xA612), PACK(0xA454), PACK(0xA596),
166 PACK(0xA0D8), PACK(0xA11A), PACK(0xA35C), PACK(0xA29E),
167 PACK(0xB5E0), PACK(0xB422), PACK(0xB664), PACK(0xB7A6),
168 PACK(0xB2E8), PACK(0xB32A), PACK(0xB16C), PACK(0xB0AE),
169 PACK(0xBBF0), PACK(0xBA32), PACK(0xB874), PACK(0xB9B6),
170 PACK(0xBCF8), PACK(0xBD3A), PACK(0xBF7C), PACK(0xBEBE)
171 };
172
173 while (1) {
174 Z.hi ^= Htable[n].hi;
175 Z.lo ^= Htable[n].lo;
176
177 if ((u8 *)Xi == xi)
178 break;
179
180 n = *(--xi);
181
182 rem = (size_t)Z.lo & 0xff;
183 Z.lo = (Z.hi << 56) | (Z.lo >> 8);
184 Z.hi = (Z.hi >> 8);
185 if (sizeof(size_t) == 8)
186 Z.hi ^= rem_8bit[rem];
187 else
188 Z.hi ^= (u64)rem_8bit[rem] << 32;
189 }
190
191 if (is_endian.little) {
192# ifdef BSWAP8
193 Xi[0] = BSWAP8(Z.hi);
194 Xi[1] = BSWAP8(Z.lo);
195# else
196 u8 *p = (u8 *)Xi;
197 u32 v;
198 v = (u32)(Z.hi >> 32);
199 PUTU32(p, v);
200 v = (u32)(Z.hi);
201 PUTU32(p + 4, v);
202 v = (u32)(Z.lo >> 32);
203 PUTU32(p + 8, v);
204 v = (u32)(Z.lo);
205 PUTU32(p + 12, v);
206# endif
207 } else {
208 Xi[0] = Z.hi;
209 Xi[1] = Z.lo;
210 }
211}
212
213# define GCM_MUL(ctx) gcm_gmult_8bit(ctx->Xi.u,ctx->Htable)
214
215#elif TABLE_BITS==4
216
217static void gcm_init_4bit(u128 Htable[16], u64 H[2])
218{
219 u128 V;
220# if defined(OPENSSL_SMALL_FOOTPRINT)
221 int i;
222# endif
223
224 Htable[0].hi = 0;
225 Htable[0].lo = 0;
226 V.hi = H[0];
227 V.lo = H[1];
228
229# if defined(OPENSSL_SMALL_FOOTPRINT)
230 for (Htable[8] = V, i = 4; i > 0; i >>= 1) {
231 REDUCE1BIT(V);
232 Htable[i] = V;
233 }
234
235 for (i = 2; i < 16; i <<= 1) {
236 u128 *Hi = Htable + i;
237 int j;
238 for (V = *Hi, j = 1; j < i; ++j) {
239 Hi[j].hi = V.hi ^ Htable[j].hi;
240 Hi[j].lo = V.lo ^ Htable[j].lo;
241 }
242 }
243# else
244 Htable[8] = V;
245 REDUCE1BIT(V);
246 Htable[4] = V;
247 REDUCE1BIT(V);
248 Htable[2] = V;
249 REDUCE1BIT(V);
250 Htable[1] = V;
251 Htable[3].hi = V.hi ^ Htable[2].hi, Htable[3].lo = V.lo ^ Htable[2].lo;
252 V = Htable[4];
253 Htable[5].hi = V.hi ^ Htable[1].hi, Htable[5].lo = V.lo ^ Htable[1].lo;
254 Htable[6].hi = V.hi ^ Htable[2].hi, Htable[6].lo = V.lo ^ Htable[2].lo;
255 Htable[7].hi = V.hi ^ Htable[3].hi, Htable[7].lo = V.lo ^ Htable[3].lo;
256 V = Htable[8];
257 Htable[9].hi = V.hi ^ Htable[1].hi, Htable[9].lo = V.lo ^ Htable[1].lo;
258 Htable[10].hi = V.hi ^ Htable[2].hi, Htable[10].lo = V.lo ^ Htable[2].lo;
259 Htable[11].hi = V.hi ^ Htable[3].hi, Htable[11].lo = V.lo ^ Htable[3].lo;
260 Htable[12].hi = V.hi ^ Htable[4].hi, Htable[12].lo = V.lo ^ Htable[4].lo;
261 Htable[13].hi = V.hi ^ Htable[5].hi, Htable[13].lo = V.lo ^ Htable[5].lo;
262 Htable[14].hi = V.hi ^ Htable[6].hi, Htable[14].lo = V.lo ^ Htable[6].lo;
263 Htable[15].hi = V.hi ^ Htable[7].hi, Htable[15].lo = V.lo ^ Htable[7].lo;
264# endif
265# if defined(GHASH_ASM) && (defined(__arm__) || defined(__arm))
266 /*
267 * ARM assembler expects specific dword order in Htable.
268 */
269 {
270 int j;
271 const union {
272 long one;
273 char little;
274 } is_endian = { 1 };
275
276 if (is_endian.little)
277 for (j = 0; j < 16; ++j) {
278 V = Htable[j];
279 Htable[j].hi = V.lo;
280 Htable[j].lo = V.hi;
281 } else
282 for (j = 0; j < 16; ++j) {
283 V = Htable[j];
284 Htable[j].hi = V.lo << 32 | V.lo >> 32;
285 Htable[j].lo = V.hi << 32 | V.hi >> 32;
286 }
287 }
288# endif
289}
290
291# ifndef GHASH_ASM
292static const size_t rem_4bit[16] = {
293 PACK(0x0000), PACK(0x1C20), PACK(0x3840), PACK(0x2460),
294 PACK(0x7080), PACK(0x6CA0), PACK(0x48C0), PACK(0x54E0),
295 PACK(0xE100), PACK(0xFD20), PACK(0xD940), PACK(0xC560),
296 PACK(0x9180), PACK(0x8DA0), PACK(0xA9C0), PACK(0xB5E0)
297};
298
299static void gcm_gmult_4bit(u64 Xi[2], const u128 Htable[16])
300{
301 u128 Z;
302 int cnt = 15;
303 size_t rem, nlo, nhi;
304 const union {
305 long one;
306 char little;
307 } is_endian = { 1 };
308
309 nlo = ((const u8 *)Xi)[15];
310 nhi = nlo >> 4;
311 nlo &= 0xf;
312
313 Z.hi = Htable[nlo].hi;
314 Z.lo = Htable[nlo].lo;
315
316 while (1) {
317 rem = (size_t)Z.lo & 0xf;
318 Z.lo = (Z.hi << 60) | (Z.lo >> 4);
319 Z.hi = (Z.hi >> 4);
320 if (sizeof(size_t) == 8)
321 Z.hi ^= rem_4bit[rem];
322 else
323 Z.hi ^= (u64)rem_4bit[rem] << 32;
324
325 Z.hi ^= Htable[nhi].hi;
326 Z.lo ^= Htable[nhi].lo;
327
328 if (--cnt < 0)
329 break;
330
331 nlo = ((const u8 *)Xi)[cnt];
332 nhi = nlo >> 4;
333 nlo &= 0xf;
334
335 rem = (size_t)Z.lo & 0xf;
336 Z.lo = (Z.hi << 60) | (Z.lo >> 4);
337 Z.hi = (Z.hi >> 4);
338 if (sizeof(size_t) == 8)
339 Z.hi ^= rem_4bit[rem];
340 else
341 Z.hi ^= (u64)rem_4bit[rem] << 32;
342
343 Z.hi ^= Htable[nlo].hi;
344 Z.lo ^= Htable[nlo].lo;
345 }
346
347 if (is_endian.little) {
348# ifdef BSWAP8
349 Xi[0] = BSWAP8(Z.hi);
350 Xi[1] = BSWAP8(Z.lo);
351# else
352 u8 *p = (u8 *)Xi;
353 u32 v;
354 v = (u32)(Z.hi >> 32);
355 PUTU32(p, v);
356 v = (u32)(Z.hi);
357 PUTU32(p + 4, v);
358 v = (u32)(Z.lo >> 32);
359 PUTU32(p + 8, v);
360 v = (u32)(Z.lo);
361 PUTU32(p + 12, v);
362# endif
363 } else {
364 Xi[0] = Z.hi;
365 Xi[1] = Z.lo;
366 }
367}
368
369# if !defined(OPENSSL_SMALL_FOOTPRINT)
370/*
371 * Streamed gcm_mult_4bit, see CRYPTO_gcm128_[en|de]crypt for
372 * details... Compiler-generated code doesn't seem to give any
373 * performance improvement, at least not on x86[_64]. It's here
374 * mostly as reference and a placeholder for possible future
375 * non-trivial optimization[s]...
376 */
377static void gcm_ghash_4bit(u64 Xi[2], const u128 Htable[16],
378 const u8 *inp, size_t len)
379{
380 u128 Z;
381 int cnt;
382 size_t rem, nlo, nhi;
383 const union {
384 long one;
385 char little;
386 } is_endian = { 1 };
387
388# if 1
389 do {
390 cnt = 15;
391 nlo = ((const u8 *)Xi)[15];
392 nlo ^= inp[15];
393 nhi = nlo >> 4;
394 nlo &= 0xf;
395
396 Z.hi = Htable[nlo].hi;
397 Z.lo = Htable[nlo].lo;
398
399 while (1) {
400 rem = (size_t)Z.lo & 0xf;
401 Z.lo = (Z.hi << 60) | (Z.lo >> 4);
402 Z.hi = (Z.hi >> 4);
403 if (sizeof(size_t) == 8)
404 Z.hi ^= rem_4bit[rem];
405 else
406 Z.hi ^= (u64)rem_4bit[rem] << 32;
407
408 Z.hi ^= Htable[nhi].hi;
409 Z.lo ^= Htable[nhi].lo;
410
411 if (--cnt < 0)
412 break;
413
414 nlo = ((const u8 *)Xi)[cnt];
415 nlo ^= inp[cnt];
416 nhi = nlo >> 4;
417 nlo &= 0xf;
418
419 rem = (size_t)Z.lo & 0xf;
420 Z.lo = (Z.hi << 60) | (Z.lo >> 4);
421 Z.hi = (Z.hi >> 4);
422 if (sizeof(size_t) == 8)
423 Z.hi ^= rem_4bit[rem];
424 else
425 Z.hi ^= (u64)rem_4bit[rem] << 32;
426
427 Z.hi ^= Htable[nlo].hi;
428 Z.lo ^= Htable[nlo].lo;
429 }
430# else
431 /*
432 * Extra 256+16 bytes per-key plus 512 bytes shared tables
433 * [should] give ~50% improvement... One could have PACK()-ed
434 * the rem_8bit even here, but the priority is to minimize
435 * cache footprint...
436 */
437 u128 Hshr4[16]; /* Htable shifted right by 4 bits */
438 u8 Hshl4[16]; /* Htable shifted left by 4 bits */
439 static const unsigned short rem_8bit[256] = {
440 0x0000, 0x01C2, 0x0384, 0x0246, 0x0708, 0x06CA, 0x048C, 0x054E,
441 0x0E10, 0x0FD2, 0x0D94, 0x0C56, 0x0918, 0x08DA, 0x0A9C, 0x0B5E,
442 0x1C20, 0x1DE2, 0x1FA4, 0x1E66, 0x1B28, 0x1AEA, 0x18AC, 0x196E,
443 0x1230, 0x13F2, 0x11B4, 0x1076, 0x1538, 0x14FA, 0x16BC, 0x177E,
444 0x3840, 0x3982, 0x3BC4, 0x3A06, 0x3F48, 0x3E8A, 0x3CCC, 0x3D0E,
445 0x3650, 0x3792, 0x35D4, 0x3416, 0x3158, 0x309A, 0x32DC, 0x331E,
446 0x2460, 0x25A2, 0x27E4, 0x2626, 0x2368, 0x22AA, 0x20EC, 0x212E,
447 0x2A70, 0x2BB2, 0x29F4, 0x2836, 0x2D78, 0x2CBA, 0x2EFC, 0x2F3E,
448 0x7080, 0x7142, 0x7304, 0x72C6, 0x7788, 0x764A, 0x740C, 0x75CE,
449 0x7E90, 0x7F52, 0x7D14, 0x7CD6, 0x7998, 0x785A, 0x7A1C, 0x7BDE,
450 0x6CA0, 0x6D62, 0x6F24, 0x6EE6, 0x6BA8, 0x6A6A, 0x682C, 0x69EE,
451 0x62B0, 0x6372, 0x6134, 0x60F6, 0x65B8, 0x647A, 0x663C, 0x67FE,
452 0x48C0, 0x4902, 0x4B44, 0x4A86, 0x4FC8, 0x4E0A, 0x4C4C, 0x4D8E,
453 0x46D0, 0x4712, 0x4554, 0x4496, 0x41D8, 0x401A, 0x425C, 0x439E,
454 0x54E0, 0x5522, 0x5764, 0x56A6, 0x53E8, 0x522A, 0x506C, 0x51AE,
455 0x5AF0, 0x5B32, 0x5974, 0x58B6, 0x5DF8, 0x5C3A, 0x5E7C, 0x5FBE,
456 0xE100, 0xE0C2, 0xE284, 0xE346, 0xE608, 0xE7CA, 0xE58C, 0xE44E,
457 0xEF10, 0xEED2, 0xEC94, 0xED56, 0xE818, 0xE9DA, 0xEB9C, 0xEA5E,
458 0xFD20, 0xFCE2, 0xFEA4, 0xFF66, 0xFA28, 0xFBEA, 0xF9AC, 0xF86E,
459 0xF330, 0xF2F2, 0xF0B4, 0xF176, 0xF438, 0xF5FA, 0xF7BC, 0xF67E,
460 0xD940, 0xD882, 0xDAC4, 0xDB06, 0xDE48, 0xDF8A, 0xDDCC, 0xDC0E,
461 0xD750, 0xD692, 0xD4D4, 0xD516, 0xD058, 0xD19A, 0xD3DC, 0xD21E,
462 0xC560, 0xC4A2, 0xC6E4, 0xC726, 0xC268, 0xC3AA, 0xC1EC, 0xC02E,
463 0xCB70, 0xCAB2, 0xC8F4, 0xC936, 0xCC78, 0xCDBA, 0xCFFC, 0xCE3E,
464 0x9180, 0x9042, 0x9204, 0x93C6, 0x9688, 0x974A, 0x950C, 0x94CE,
465 0x9F90, 0x9E52, 0x9C14, 0x9DD6, 0x9898, 0x995A, 0x9B1C, 0x9ADE,
466 0x8DA0, 0x8C62, 0x8E24, 0x8FE6, 0x8AA8, 0x8B6A, 0x892C, 0x88EE,
467 0x83B0, 0x8272, 0x8034, 0x81F6, 0x84B8, 0x857A, 0x873C, 0x86FE,
468 0xA9C0, 0xA802, 0xAA44, 0xAB86, 0xAEC8, 0xAF0A, 0xAD4C, 0xAC8E,
469 0xA7D0, 0xA612, 0xA454, 0xA596, 0xA0D8, 0xA11A, 0xA35C, 0xA29E,
470 0xB5E0, 0xB422, 0xB664, 0xB7A6, 0xB2E8, 0xB32A, 0xB16C, 0xB0AE,
471 0xBBF0, 0xBA32, 0xB874, 0xB9B6, 0xBCF8, 0xBD3A, 0xBF7C, 0xBEBE
472 };
473 /*
474 * This pre-processing phase slows down procedure by approximately
475 * same time as it makes each loop spin faster. In other words
476 * single block performance is approximately same as straightforward
477 * "4-bit" implementation, and then it goes only faster...
478 */
479 for (cnt = 0; cnt < 16; ++cnt) {
480 Z.hi = Htable[cnt].hi;
481 Z.lo = Htable[cnt].lo;
482 Hshr4[cnt].lo = (Z.hi << 60) | (Z.lo >> 4);
483 Hshr4[cnt].hi = (Z.hi >> 4);
484 Hshl4[cnt] = (u8)(Z.lo << 4);
485 }
486
487 do {
488 for (Z.lo = 0, Z.hi = 0, cnt = 15; cnt; --cnt) {
489 nlo = ((const u8 *)Xi)[cnt];
490 nlo ^= inp[cnt];
491 nhi = nlo >> 4;
492 nlo &= 0xf;
493
494 Z.hi ^= Htable[nlo].hi;
495 Z.lo ^= Htable[nlo].lo;
496
497 rem = (size_t)Z.lo & 0xff;
498
499 Z.lo = (Z.hi << 56) | (Z.lo >> 8);
500 Z.hi = (Z.hi >> 8);
501
502 Z.hi ^= Hshr4[nhi].hi;
503 Z.lo ^= Hshr4[nhi].lo;
504 Z.hi ^= (u64)rem_8bit[rem ^ Hshl4[nhi]] << 48;
505 }
506
507 nlo = ((const u8 *)Xi)[0];
508 nlo ^= inp[0];
509 nhi = nlo >> 4;
510 nlo &= 0xf;
511
512 Z.hi ^= Htable[nlo].hi;
513 Z.lo ^= Htable[nlo].lo;
514
515 rem = (size_t)Z.lo & 0xf;
516
517 Z.lo = (Z.hi << 60) | (Z.lo >> 4);
518 Z.hi = (Z.hi >> 4);
519
520 Z.hi ^= Htable[nhi].hi;
521 Z.lo ^= Htable[nhi].lo;
522 Z.hi ^= ((u64)rem_8bit[rem << 4]) << 48;
523# endif
524
525 if (is_endian.little) {
526# ifdef BSWAP8
527 Xi[0] = BSWAP8(Z.hi);
528 Xi[1] = BSWAP8(Z.lo);
529# else
530 u8 *p = (u8 *)Xi;
531 u32 v;
532 v = (u32)(Z.hi >> 32);
533 PUTU32(p, v);
534 v = (u32)(Z.hi);
535 PUTU32(p + 4, v);
536 v = (u32)(Z.lo >> 32);
537 PUTU32(p + 8, v);
538 v = (u32)(Z.lo);
539 PUTU32(p + 12, v);
540# endif
541 } else {
542 Xi[0] = Z.hi;
543 Xi[1] = Z.lo;
544 }
545 } while (inp += 16, len -= 16);
546}
547# endif
548# else
549void gcm_gmult_4bit(u64 Xi[2], const u128 Htable[16]);
550void gcm_ghash_4bit(u64 Xi[2], const u128 Htable[16], const u8 *inp,
551 size_t len);
552# endif
553
554# define GCM_MUL(ctx) gcm_gmult_4bit(ctx->Xi.u,ctx->Htable)
555# if defined(GHASH_ASM) || !defined(OPENSSL_SMALL_FOOTPRINT)
556# define GHASH(ctx,in,len) gcm_ghash_4bit((ctx)->Xi.u,(ctx)->Htable,in,len)
557/*
558 * GHASH_CHUNK is "stride parameter" missioned to mitigate cache trashing
559 * effect. In other words idea is to hash data while it's still in L1 cache
560 * after encryption pass...
561 */
562# define GHASH_CHUNK (3*1024)
563# endif
564
565#else /* TABLE_BITS */
566
567static void gcm_gmult_1bit(u64 Xi[2], const u64 H[2])
568{
569 u128 V, Z = { 0, 0 };
570 long X;
571 int i, j;
572 const long *xi = (const long *)Xi;
573 const union {
574 long one;
575 char little;
576 } is_endian = { 1 };
577
578 V.hi = H[0]; /* H is in host byte order, no byte swapping */
579 V.lo = H[1];
580
581 for (j = 0; j < 16 / sizeof(long); ++j) {
582 if (is_endian.little) {
583 if (sizeof(long) == 8) {
584# ifdef BSWAP8
585 X = (long)(BSWAP8(xi[j]));
586# else
587 const u8 *p = (const u8 *)(xi + j);
588 X = (long)((u64)GETU32(p) << 32 | GETU32(p + 4));
589# endif
590 } else {
591 const u8 *p = (const u8 *)(xi + j);
592 X = (long)GETU32(p);
593 }
594 } else
595 X = xi[j];
596
597 for (i = 0; i < 8 * sizeof(long); ++i, X <<= 1) {
598 u64 M = (u64)(X >> (8 * sizeof(long) - 1));
599 Z.hi ^= V.hi & M;
600 Z.lo ^= V.lo & M;
601
602 REDUCE1BIT(V);
603 }
604 }
605
606 if (is_endian.little) {
607# ifdef BSWAP8
608 Xi[0] = BSWAP8(Z.hi);
609 Xi[1] = BSWAP8(Z.lo);
610# else
611 u8 *p = (u8 *)Xi;
612 u32 v;
613 v = (u32)(Z.hi >> 32);
614 PUTU32(p, v);
615 v = (u32)(Z.hi);
616 PUTU32(p + 4, v);
617 v = (u32)(Z.lo >> 32);
618 PUTU32(p + 8, v);
619 v = (u32)(Z.lo);
620 PUTU32(p + 12, v);
621# endif
622 } else {
623 Xi[0] = Z.hi;
624 Xi[1] = Z.lo;
625 }
626}
627
628# define GCM_MUL(ctx) gcm_gmult_1bit(ctx->Xi.u,ctx->H.u)
629
630#endif
631
632#if TABLE_BITS==4 && (defined(GHASH_ASM) || defined(OPENSSL_CPUID_OBJ))
633# if !defined(I386_ONLY) && \
634 (defined(__i386) || defined(__i386__) || \
635 defined(__x86_64) || defined(__x86_64__) || \
636 defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64))
637# define GHASH_ASM_X86_OR_64
638# define GCM_FUNCREF_4BIT
639
640void gcm_init_clmul(u128 Htable[16], const u64 Xi[2]);
641void gcm_gmult_clmul(u64 Xi[2], const u128 Htable[16]);
642void gcm_ghash_clmul(u64 Xi[2], const u128 Htable[16], const u8 *inp,
643 size_t len);
644
645# if defined(__i386) || defined(__i386__) || defined(_M_IX86)
646# define gcm_init_avx gcm_init_clmul
647# define gcm_gmult_avx gcm_gmult_clmul
648# define gcm_ghash_avx gcm_ghash_clmul
649# else
650void gcm_init_avx(u128 Htable[16], const u64 Xi[2]);
651void gcm_gmult_avx(u64 Xi[2], const u128 Htable[16]);
652void gcm_ghash_avx(u64 Xi[2], const u128 Htable[16], const u8 *inp,
653 size_t len);
654# endif
655
656# if defined(__i386) || defined(__i386__) || defined(_M_IX86)
657# define GHASH_ASM_X86
658void gcm_gmult_4bit_mmx(u64 Xi[2], const u128 Htable[16]);
659void gcm_ghash_4bit_mmx(u64 Xi[2], const u128 Htable[16], const u8 *inp,
660 size_t len);
661
662void gcm_gmult_4bit_x86(u64 Xi[2], const u128 Htable[16]);
663void gcm_ghash_4bit_x86(u64 Xi[2], const u128 Htable[16], const u8 *inp,
664 size_t len);
665# endif
666# elif defined(__arm__) || defined(__arm) || defined(__aarch64__)
667# include "arm_arch.h"
668# if __ARM_MAX_ARCH__>=7
669# define GHASH_ASM_ARM
670# define GCM_FUNCREF_4BIT
671# define PMULL_CAPABLE (OPENSSL_armcap_P & ARMV8_PMULL)
672# if defined(__arm__) || defined(__arm)
673# define NEON_CAPABLE (OPENSSL_armcap_P & ARMV7_NEON)
674# endif
675void gcm_init_neon(u128 Htable[16], const u64 Xi[2]);
676void gcm_gmult_neon(u64 Xi[2], const u128 Htable[16]);
677void gcm_ghash_neon(u64 Xi[2], const u128 Htable[16], const u8 *inp,
678 size_t len);
679void gcm_init_v8(u128 Htable[16], const u64 Xi[2]);
680void gcm_gmult_v8(u64 Xi[2], const u128 Htable[16]);
681void gcm_ghash_v8(u64 Xi[2], const u128 Htable[16], const u8 *inp,
682 size_t len);
683# endif
684# elif defined(__sparc__) || defined(__sparc)
685# include "sparc_arch.h"
686# define GHASH_ASM_SPARC
687# define GCM_FUNCREF_4BIT
688extern unsigned int OPENSSL_sparcv9cap_P[];
689void gcm_init_vis3(u128 Htable[16], const u64 Xi[2]);
690void gcm_gmult_vis3(u64 Xi[2], const u128 Htable[16]);
691void gcm_ghash_vis3(u64 Xi[2], const u128 Htable[16], const u8 *inp,
692 size_t len);
693# elif defined(OPENSSL_CPUID_OBJ) && (defined(__powerpc__) || defined(__ppc__) || defined(_ARCH_PPC))
694# include "ppc_arch.h"
695# define GHASH_ASM_PPC
696# define GCM_FUNCREF_4BIT
697void gcm_init_p8(u128 Htable[16], const u64 Xi[2]);
698void gcm_gmult_p8(u64 Xi[2], const u128 Htable[16]);
699void gcm_ghash_p8(u64 Xi[2], const u128 Htable[16], const u8 *inp,
700 size_t len);
701# endif
702#endif
703
704#ifdef GCM_FUNCREF_4BIT
705# undef GCM_MUL
706# define GCM_MUL(ctx) (*gcm_gmult_p)(ctx->Xi.u,ctx->Htable)
707# ifdef GHASH
708# undef GHASH
709# define GHASH(ctx,in,len) (*gcm_ghash_p)(ctx->Xi.u,ctx->Htable,in,len)
710# endif
711#endif
712
713void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx, void *key, block128_f block)
714{
715 const union {
716 long one;
717 char little;
718 } is_endian = { 1 };
719
720 memset(ctx, 0, sizeof(*ctx));
721 ctx->block = block;
722 ctx->key = key;
723
724 (*block) (ctx->H.c, ctx->H.c, key);
725
726 if (is_endian.little) {
727 /* H is stored in host byte order */
728#ifdef BSWAP8
729 ctx->H.u[0] = BSWAP8(ctx->H.u[0]);
730 ctx->H.u[1] = BSWAP8(ctx->H.u[1]);
731#else
732 u8 *p = ctx->H.c;
733 u64 hi, lo;
734 hi = (u64)GETU32(p) << 32 | GETU32(p + 4);
735 lo = (u64)GETU32(p + 8) << 32 | GETU32(p + 12);
736 ctx->H.u[0] = hi;
737 ctx->H.u[1] = lo;
738#endif
739 }
740#if TABLE_BITS==8
741 gcm_init_8bit(ctx->Htable, ctx->H.u);
742#elif TABLE_BITS==4
743# if defined(GHASH)
744# define CTX__GHASH(f) (ctx->ghash = (f))
745# else
746# define CTX__GHASH(f) (ctx->ghash = NULL)
747# endif
748# if defined(GHASH_ASM_X86_OR_64)
749# if !defined(GHASH_ASM_X86) || defined(OPENSSL_IA32_SSE2)
750 if (OPENSSL_ia32cap_P[1] & (1 << 1)) { /* check PCLMULQDQ bit */
751 if (((OPENSSL_ia32cap_P[1] >> 22) & 0x41) == 0x41) { /* AVX+MOVBE */
752 gcm_init_avx(ctx->Htable, ctx->H.u);
753 ctx->gmult = gcm_gmult_avx;
754 CTX__GHASH(gcm_ghash_avx);
755 } else {
756 gcm_init_clmul(ctx->Htable, ctx->H.u);
757 ctx->gmult = gcm_gmult_clmul;
758 CTX__GHASH(gcm_ghash_clmul);
759 }
760 return;
761 }
762# endif
763 gcm_init_4bit(ctx->Htable, ctx->H.u);
764# if defined(GHASH_ASM_X86) /* x86 only */
765# if defined(OPENSSL_IA32_SSE2)
766 if (OPENSSL_ia32cap_P[0] & (1 << 25)) { /* check SSE bit */
767# else
768 if (OPENSSL_ia32cap_P[0] & (1 << 23)) { /* check MMX bit */
769# endif
770 ctx->gmult = gcm_gmult_4bit_mmx;
771 CTX__GHASH(gcm_ghash_4bit_mmx);
772 } else {
773 ctx->gmult = gcm_gmult_4bit_x86;
774 CTX__GHASH(gcm_ghash_4bit_x86);
775 }
776# else
777 ctx->gmult = gcm_gmult_4bit;
778 CTX__GHASH(gcm_ghash_4bit);
779# endif
780# elif defined(GHASH_ASM_ARM)
781# ifdef PMULL_CAPABLE
782 if (PMULL_CAPABLE) {
783 gcm_init_v8(ctx->Htable, ctx->H.u);
784 ctx->gmult = gcm_gmult_v8;
785 CTX__GHASH(gcm_ghash_v8);
786 } else
787# endif
788# ifdef NEON_CAPABLE
789 if (NEON_CAPABLE) {
790 gcm_init_neon(ctx->Htable, ctx->H.u);
791 ctx->gmult = gcm_gmult_neon;
792 CTX__GHASH(gcm_ghash_neon);
793 } else
794# endif
795 {
796 gcm_init_4bit(ctx->Htable, ctx->H.u);
797 ctx->gmult = gcm_gmult_4bit;
798 CTX__GHASH(gcm_ghash_4bit);
799 }
800# elif defined(GHASH_ASM_SPARC)
801 if (OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3) {
802 gcm_init_vis3(ctx->Htable, ctx->H.u);
803 ctx->gmult = gcm_gmult_vis3;
804 CTX__GHASH(gcm_ghash_vis3);
805 } else {
806 gcm_init_4bit(ctx->Htable, ctx->H.u);
807 ctx->gmult = gcm_gmult_4bit;
808 CTX__GHASH(gcm_ghash_4bit);
809 }
810# elif defined(GHASH_ASM_PPC)
811 if (OPENSSL_ppccap_P & PPC_CRYPTO207) {
812 gcm_init_p8(ctx->Htable, ctx->H.u);
813 ctx->gmult = gcm_gmult_p8;
814 CTX__GHASH(gcm_ghash_p8);
815 } else {
816 gcm_init_4bit(ctx->Htable, ctx->H.u);
817 ctx->gmult = gcm_gmult_4bit;
818 CTX__GHASH(gcm_ghash_4bit);
819 }
820# else
821 gcm_init_4bit(ctx->Htable, ctx->H.u);
822# endif
823# undef CTX__GHASH
824#endif
825}
826
827void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx, const unsigned char *iv,
828 size_t len)
829{
830 const union {
831 long one;
832 char little;
833 } is_endian = { 1 };
834 unsigned int ctr;
835#ifdef GCM_FUNCREF_4BIT
836 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
837#endif
838
839 ctx->len.u[0] = 0; /* AAD length */
840 ctx->len.u[1] = 0; /* message length */
841 ctx->ares = 0;
842 ctx->mres = 0;
843
844 if (len == 12) {
845 memcpy(ctx->Yi.c, iv, 12);
846 ctx->Yi.c[12] = 0;
847 ctx->Yi.c[13] = 0;
848 ctx->Yi.c[14] = 0;
849 ctx->Yi.c[15] = 1;
850 ctr = 1;
851 } else {
852 size_t i;
853 u64 len0 = len;
854
855 /* Borrow ctx->Xi to calculate initial Yi */
856 ctx->Xi.u[0] = 0;
857 ctx->Xi.u[1] = 0;
858
859 while (len >= 16) {
860 for (i = 0; i < 16; ++i)
861 ctx->Xi.c[i] ^= iv[i];
862 GCM_MUL(ctx);
863 iv += 16;
864 len -= 16;
865 }
866 if (len) {
867 for (i = 0; i < len; ++i)
868 ctx->Xi.c[i] ^= iv[i];
869 GCM_MUL(ctx);
870 }
871 len0 <<= 3;
872 if (is_endian.little) {
873#ifdef BSWAP8
874 ctx->Xi.u[1] ^= BSWAP8(len0);
875#else
876 ctx->Xi.c[8] ^= (u8)(len0 >> 56);
877 ctx->Xi.c[9] ^= (u8)(len0 >> 48);
878 ctx->Xi.c[10] ^= (u8)(len0 >> 40);
879 ctx->Xi.c[11] ^= (u8)(len0 >> 32);
880 ctx->Xi.c[12] ^= (u8)(len0 >> 24);
881 ctx->Xi.c[13] ^= (u8)(len0 >> 16);
882 ctx->Xi.c[14] ^= (u8)(len0 >> 8);
883 ctx->Xi.c[15] ^= (u8)(len0);
884#endif
885 } else {
886 ctx->Xi.u[1] ^= len0;
887 }
888
889 GCM_MUL(ctx);
890
891 if (is_endian.little)
892#ifdef BSWAP4
893 ctr = BSWAP4(ctx->Xi.d[3]);
894#else
895 ctr = GETU32(ctx->Xi.c + 12);
896#endif
897 else
898 ctr = ctx->Xi.d[3];
899
900 /* Copy borrowed Xi to Yi */
901 ctx->Yi.u[0] = ctx->Xi.u[0];
902 ctx->Yi.u[1] = ctx->Xi.u[1];
903 }
904
905 ctx->Xi.u[0] = 0;
906 ctx->Xi.u[1] = 0;
907
908 (*ctx->block) (ctx->Yi.c, ctx->EK0.c, ctx->key);
909 ++ctr;
910 if (is_endian.little)
911#ifdef BSWAP4
912 ctx->Yi.d[3] = BSWAP4(ctr);
913#else
914 PUTU32(ctx->Yi.c + 12, ctr);
915#endif
916 else
917 ctx->Yi.d[3] = ctr;
918}
919
920int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx, const unsigned char *aad,
921 size_t len)
922{
923 size_t i;
924 unsigned int n;
925 u64 alen = ctx->len.u[0];
926#ifdef GCM_FUNCREF_4BIT
927 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
928# ifdef GHASH
929 void (*gcm_ghash_p) (u64 Xi[2], const u128 Htable[16],
930 const u8 *inp, size_t len) = ctx->ghash;
931# endif
932#endif
933
934 if (ctx->len.u[1])
935 return -2;
936
937 alen += len;
938 if (alen > (U64(1) << 61) || (sizeof(len) == 8 && alen < len))
939 return -1;
940 ctx->len.u[0] = alen;
941
942 n = ctx->ares;
943 if (n) {
944 while (n && len) {
945 ctx->Xi.c[n] ^= *(aad++);
946 --len;
947 n = (n + 1) % 16;
948 }
949 if (n == 0)
950 GCM_MUL(ctx);
951 else {
952 ctx->ares = n;
953 return 0;
954 }
955 }
956#ifdef GHASH
957 if ((i = (len & (size_t)-16))) {
958 GHASH(ctx, aad, i);
959 aad += i;
960 len -= i;
961 }
962#else
963 while (len >= 16) {
964 for (i = 0; i < 16; ++i)
965 ctx->Xi.c[i] ^= aad[i];
966 GCM_MUL(ctx);
967 aad += 16;
968 len -= 16;
969 }
970#endif
971 if (len) {
972 n = (unsigned int)len;
973 for (i = 0; i < len; ++i)
974 ctx->Xi.c[i] ^= aad[i];
975 }
976
977 ctx->ares = n;
978 return 0;
979}
980
981int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
982 const unsigned char *in, unsigned char *out,
983 size_t len)
984{
985 const union {
986 long one;
987 char little;
988 } is_endian = { 1 };
989 unsigned int n, ctr, mres;
990 size_t i;
991 u64 mlen = ctx->len.u[1];
992 block128_f block = ctx->block;
993 void *key = ctx->key;
994#ifdef GCM_FUNCREF_4BIT
995 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
996# if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
997 void (*gcm_ghash_p) (u64 Xi[2], const u128 Htable[16],
998 const u8 *inp, size_t len) = ctx->ghash;
999# endif
1000#endif
1001
1002 mlen += len;
1003 if (mlen > ((U64(1) << 36) - 32) || (sizeof(len) == 8 && mlen < len))
1004 return -1;
1005 ctx->len.u[1] = mlen;
1006
1007 mres = ctx->mres;
1008
1009 if (ctx->ares) {
1010 /* First call to encrypt finalizes GHASH(AAD) */
1011#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1012 if (len == 0) {
1013 GCM_MUL(ctx);
1014 ctx->ares = 0;
1015 return 0;
1016 }
1017 memcpy(ctx->Xn, ctx->Xi.c, sizeof(ctx->Xi));
1018 ctx->Xi.u[0] = 0;
1019 ctx->Xi.u[1] = 0;
1020 mres = sizeof(ctx->Xi);
1021#else
1022 GCM_MUL(ctx);
1023#endif
1024 ctx->ares = 0;
1025 }
1026
1027 if (is_endian.little)
1028#ifdef BSWAP4
1029 ctr = BSWAP4(ctx->Yi.d[3]);
1030#else
1031 ctr = GETU32(ctx->Yi.c + 12);
1032#endif
1033 else
1034 ctr = ctx->Yi.d[3];
1035
1036 n = mres % 16;
1037#if !defined(OPENSSL_SMALL_FOOTPRINT)
1038 if (16 % sizeof(size_t) == 0) { /* always true actually */
1039 do {
1040 if (n) {
1041# if defined(GHASH)
1042 while (n && len) {
1043 ctx->Xn[mres++] = *(out++) = *(in++) ^ ctx->EKi.c[n];
1044 --len;
1045 n = (n + 1) % 16;
1046 }
1047 if (n == 0) {
1048 GHASH(ctx, ctx->Xn, mres);
1049 mres = 0;
1050 } else {
1051 ctx->mres = mres;
1052 return 0;
1053 }
1054# else
1055 while (n && len) {
1056 ctx->Xi.c[n] ^= *(out++) = *(in++) ^ ctx->EKi.c[n];
1057 --len;
1058 n = (n + 1) % 16;
1059 }
1060 if (n == 0) {
1061 GCM_MUL(ctx);
1062 mres = 0;
1063 } else {
1064 ctx->mres = n;
1065 return 0;
1066 }
1067# endif
1068 }
1069# if defined(STRICT_ALIGNMENT)
1070 if (((size_t)in | (size_t)out) % sizeof(size_t) != 0)
1071 break;
1072# endif
1073# if defined(GHASH)
1074 if (len >= 16 && mres) {
1075 GHASH(ctx, ctx->Xn, mres);
1076 mres = 0;
1077 }
1078# if defined(GHASH_CHUNK)
1079 while (len >= GHASH_CHUNK) {
1080 size_t j = GHASH_CHUNK;
1081
1082 while (j) {
1083 size_t *out_t = (size_t *)out;
1084 const size_t *in_t = (const size_t *)in;
1085
1086 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1087 ++ctr;
1088 if (is_endian.little)
1089# ifdef BSWAP4
1090 ctx->Yi.d[3] = BSWAP4(ctr);
1091# else
1092 PUTU32(ctx->Yi.c + 12, ctr);
1093# endif
1094 else
1095 ctx->Yi.d[3] = ctr;
1096 for (i = 0; i < 16 / sizeof(size_t); ++i)
1097 out_t[i] = in_t[i] ^ ctx->EKi.t[i];
1098 out += 16;
1099 in += 16;
1100 j -= 16;
1101 }
1102 GHASH(ctx, out - GHASH_CHUNK, GHASH_CHUNK);
1103 len -= GHASH_CHUNK;
1104 }
1105# endif
1106 if ((i = (len & (size_t)-16))) {
1107 size_t j = i;
1108
1109 while (len >= 16) {
1110 size_t *out_t = (size_t *)out;
1111 const size_t *in_t = (const size_t *)in;
1112
1113 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1114 ++ctr;
1115 if (is_endian.little)
1116# ifdef BSWAP4
1117 ctx->Yi.d[3] = BSWAP4(ctr);
1118# else
1119 PUTU32(ctx->Yi.c + 12, ctr);
1120# endif
1121 else
1122 ctx->Yi.d[3] = ctr;
1123 for (i = 0; i < 16 / sizeof(size_t); ++i)
1124 out_t[i] = in_t[i] ^ ctx->EKi.t[i];
1125 out += 16;
1126 in += 16;
1127 len -= 16;
1128 }
1129 GHASH(ctx, out - j, j);
1130 }
1131# else
1132 while (len >= 16) {
1133 size_t *out_t = (size_t *)out;
1134 const size_t *in_t = (const size_t *)in;
1135
1136 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1137 ++ctr;
1138 if (is_endian.little)
1139# ifdef BSWAP4
1140 ctx->Yi.d[3] = BSWAP4(ctr);
1141# else
1142 PUTU32(ctx->Yi.c + 12, ctr);
1143# endif
1144 else
1145 ctx->Yi.d[3] = ctr;
1146 for (i = 0; i < 16 / sizeof(size_t); ++i)
1147 ctx->Xi.t[i] ^= out_t[i] = in_t[i] ^ ctx->EKi.t[i];
1148 GCM_MUL(ctx);
1149 out += 16;
1150 in += 16;
1151 len -= 16;
1152 }
1153# endif
1154 if (len) {
1155 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1156 ++ctr;
1157 if (is_endian.little)
1158# ifdef BSWAP4
1159 ctx->Yi.d[3] = BSWAP4(ctr);
1160# else
1161 PUTU32(ctx->Yi.c + 12, ctr);
1162# endif
1163 else
1164 ctx->Yi.d[3] = ctr;
1165# if defined(GHASH)
1166 while (len--) {
1167 ctx->Xn[mres++] = out[n] = in[n] ^ ctx->EKi.c[n];
1168 ++n;
1169 }
1170# else
1171 while (len--) {
1172 ctx->Xi.c[n] ^= out[n] = in[n] ^ ctx->EKi.c[n];
1173 ++n;
1174 }
1175 mres = n;
1176# endif
1177 }
1178
1179 ctx->mres = mres;
1180 return 0;
1181 } while (0);
1182 }
1183#endif
1184 for (i = 0; i < len; ++i) {
1185 if (n == 0) {
1186 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1187 ++ctr;
1188 if (is_endian.little)
1189#ifdef BSWAP4
1190 ctx->Yi.d[3] = BSWAP4(ctr);
1191#else
1192 PUTU32(ctx->Yi.c + 12, ctr);
1193#endif
1194 else
1195 ctx->Yi.d[3] = ctr;
1196 }
1197#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1198 ctx->Xn[mres++] = out[i] = in[i] ^ ctx->EKi.c[n];
1199 n = (n + 1) % 16;
1200 if (mres == sizeof(ctx->Xn)) {
1201 GHASH(ctx,ctx->Xn,sizeof(ctx->Xn));
1202 mres = 0;
1203 }
1204#else
1205 ctx->Xi.c[n] ^= out[i] = in[i] ^ ctx->EKi.c[n];
1206 mres = n = (n + 1) % 16;
1207 if (n == 0)
1208 GCM_MUL(ctx);
1209#endif
1210 }
1211
1212 ctx->mres = mres;
1213 return 0;
1214}
1215
1216int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
1217 const unsigned char *in, unsigned char *out,
1218 size_t len)
1219{
1220 const union {
1221 long one;
1222 char little;
1223 } is_endian = { 1 };
1224 unsigned int n, ctr, mres;
1225 size_t i;
1226 u64 mlen = ctx->len.u[1];
1227 block128_f block = ctx->block;
1228 void *key = ctx->key;
1229#ifdef GCM_FUNCREF_4BIT
1230 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
1231# if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1232 void (*gcm_ghash_p) (u64 Xi[2], const u128 Htable[16],
1233 const u8 *inp, size_t len) = ctx->ghash;
1234# endif
1235#endif
1236
1237 mlen += len;
1238 if (mlen > ((U64(1) << 36) - 32) || (sizeof(len) == 8 && mlen < len))
1239 return -1;
1240 ctx->len.u[1] = mlen;
1241
1242 mres = ctx->mres;
1243
1244 if (ctx->ares) {
1245 /* First call to decrypt finalizes GHASH(AAD) */
1246#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1247 if (len == 0) {
1248 GCM_MUL(ctx);
1249 ctx->ares = 0;
1250 return 0;
1251 }
1252 memcpy(ctx->Xn, ctx->Xi.c, sizeof(ctx->Xi));
1253 ctx->Xi.u[0] = 0;
1254 ctx->Xi.u[1] = 0;
1255 mres = sizeof(ctx->Xi);
1256#else
1257 GCM_MUL(ctx);
1258#endif
1259 ctx->ares = 0;
1260 }
1261
1262 if (is_endian.little)
1263#ifdef BSWAP4
1264 ctr = BSWAP4(ctx->Yi.d[3]);
1265#else
1266 ctr = GETU32(ctx->Yi.c + 12);
1267#endif
1268 else
1269 ctr = ctx->Yi.d[3];
1270
1271 n = mres % 16;
1272#if !defined(OPENSSL_SMALL_FOOTPRINT)
1273 if (16 % sizeof(size_t) == 0) { /* always true actually */
1274 do {
1275 if (n) {
1276# if defined(GHASH)
1277 while (n && len) {
1278 *(out++) = (ctx->Xn[mres++] = *(in++)) ^ ctx->EKi.c[n];
1279 --len;
1280 n = (n + 1) % 16;
1281 }
1282 if (n == 0) {
1283 GHASH(ctx, ctx->Xn, mres);
1284 mres = 0;
1285 } else {
1286 ctx->mres = mres;
1287 return 0;
1288 }
1289# else
1290 while (n && len) {
1291 u8 c = *(in++);
1292 *(out++) = c ^ ctx->EKi.c[n];
1293 ctx->Xi.c[n] ^= c;
1294 --len;
1295 n = (n + 1) % 16;
1296 }
1297 if (n == 0) {
1298 GCM_MUL(ctx);
1299 mres = 0;
1300 } else {
1301 ctx->mres = n;
1302 return 0;
1303 }
1304# endif
1305 }
1306# if defined(STRICT_ALIGNMENT)
1307 if (((size_t)in | (size_t)out) % sizeof(size_t) != 0)
1308 break;
1309# endif
1310# if defined(GHASH)
1311 if (len >= 16 && mres) {
1312 GHASH(ctx, ctx->Xn, mres);
1313 mres = 0;
1314 }
1315# if defined(GHASH_CHUNK)
1316 while (len >= GHASH_CHUNK) {
1317 size_t j = GHASH_CHUNK;
1318
1319 GHASH(ctx, in, GHASH_CHUNK);
1320 while (j) {
1321 size_t *out_t = (size_t *)out;
1322 const size_t *in_t = (const size_t *)in;
1323
1324 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1325 ++ctr;
1326 if (is_endian.little)
1327# ifdef BSWAP4
1328 ctx->Yi.d[3] = BSWAP4(ctr);
1329# else
1330 PUTU32(ctx->Yi.c + 12, ctr);
1331# endif
1332 else
1333 ctx->Yi.d[3] = ctr;
1334 for (i = 0; i < 16 / sizeof(size_t); ++i)
1335 out_t[i] = in_t[i] ^ ctx->EKi.t[i];
1336 out += 16;
1337 in += 16;
1338 j -= 16;
1339 }
1340 len -= GHASH_CHUNK;
1341 }
1342# endif
1343 if ((i = (len & (size_t)-16))) {
1344 GHASH(ctx, in, i);
1345 while (len >= 16) {
1346 size_t *out_t = (size_t *)out;
1347 const size_t *in_t = (const size_t *)in;
1348
1349 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1350 ++ctr;
1351 if (is_endian.little)
1352# ifdef BSWAP4
1353 ctx->Yi.d[3] = BSWAP4(ctr);
1354# else
1355 PUTU32(ctx->Yi.c + 12, ctr);
1356# endif
1357 else
1358 ctx->Yi.d[3] = ctr;
1359 for (i = 0; i < 16 / sizeof(size_t); ++i)
1360 out_t[i] = in_t[i] ^ ctx->EKi.t[i];
1361 out += 16;
1362 in += 16;
1363 len -= 16;
1364 }
1365 }
1366# else
1367 while (len >= 16) {
1368 size_t *out_t = (size_t *)out;
1369 const size_t *in_t = (const size_t *)in;
1370
1371 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1372 ++ctr;
1373 if (is_endian.little)
1374# ifdef BSWAP4
1375 ctx->Yi.d[3] = BSWAP4(ctr);
1376# else
1377 PUTU32(ctx->Yi.c + 12, ctr);
1378# endif
1379 else
1380 ctx->Yi.d[3] = ctr;
1381 for (i = 0; i < 16 / sizeof(size_t); ++i) {
1382 size_t c = in[i];
1383 out[i] = c ^ ctx->EKi.t[i];
1384 ctx->Xi.t[i] ^= c;
1385 }
1386 GCM_MUL(ctx);
1387 out += 16;
1388 in += 16;
1389 len -= 16;
1390 }
1391# endif
1392 if (len) {
1393 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1394 ++ctr;
1395 if (is_endian.little)
1396# ifdef BSWAP4
1397 ctx->Yi.d[3] = BSWAP4(ctr);
1398# else
1399 PUTU32(ctx->Yi.c + 12, ctr);
1400# endif
1401 else
1402 ctx->Yi.d[3] = ctr;
1403# if defined(GHASH)
1404 while (len--) {
1405 out[n] = (ctx->Xn[mres++] = in[n]) ^ ctx->EKi.c[n];
1406 ++n;
1407 }
1408# else
1409 while (len--) {
1410 u8 c = in[n];
1411 ctx->Xi.c[n] ^= c;
1412 out[n] = c ^ ctx->EKi.c[n];
1413 ++n;
1414 }
1415 mres = n;
1416# endif
1417 }
1418
1419 ctx->mres = mres;
1420 return 0;
1421 } while (0);
1422 }
1423#endif
1424 for (i = 0; i < len; ++i) {
1425 u8 c;
1426 if (n == 0) {
1427 (*block) (ctx->Yi.c, ctx->EKi.c, key);
1428 ++ctr;
1429 if (is_endian.little)
1430#ifdef BSWAP4
1431 ctx->Yi.d[3] = BSWAP4(ctr);
1432#else
1433 PUTU32(ctx->Yi.c + 12, ctr);
1434#endif
1435 else
1436 ctx->Yi.d[3] = ctr;
1437 }
1438#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1439 out[i] = (ctx->Xn[mres++] = c = in[i]) ^ ctx->EKi.c[n];
1440 n = (n + 1) % 16;
1441 if (mres == sizeof(ctx->Xn)) {
1442 GHASH(ctx,ctx->Xn,sizeof(ctx->Xn));
1443 mres = 0;
1444 }
1445#else
1446 c = in[i];
1447 out[i] = c ^ ctx->EKi.c[n];
1448 ctx->Xi.c[n] ^= c;
1449 mres = n = (n + 1) % 16;
1450 if (n == 0)
1451 GCM_MUL(ctx);
1452#endif
1453 }
1454
1455 ctx->mres = mres;
1456 return 0;
1457}
1458
1459int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
1460 const unsigned char *in, unsigned char *out,
1461 size_t len, ctr128_f stream)
1462{
1463#if defined(OPENSSL_SMALL_FOOTPRINT)
1464 return CRYPTO_gcm128_encrypt(ctx, in, out, len);
1465#else
1466 const union {
1467 long one;
1468 char little;
1469 } is_endian = { 1 };
1470 unsigned int n, ctr, mres;
1471 size_t i;
1472 u64 mlen = ctx->len.u[1];
1473 void *key = ctx->key;
1474# ifdef GCM_FUNCREF_4BIT
1475 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
1476# ifdef GHASH
1477 void (*gcm_ghash_p) (u64 Xi[2], const u128 Htable[16],
1478 const u8 *inp, size_t len) = ctx->ghash;
1479# endif
1480# endif
1481
1482 mlen += len;
1483 if (mlen > ((U64(1) << 36) - 32) || (sizeof(len) == 8 && mlen < len))
1484 return -1;
1485 ctx->len.u[1] = mlen;
1486
1487 mres = ctx->mres;
1488
1489 if (ctx->ares) {
1490 /* First call to encrypt finalizes GHASH(AAD) */
1491#if defined(GHASH)
1492 if (len == 0) {
1493 GCM_MUL(ctx);
1494 ctx->ares = 0;
1495 return 0;
1496 }
1497 memcpy(ctx->Xn, ctx->Xi.c, sizeof(ctx->Xi));
1498 ctx->Xi.u[0] = 0;
1499 ctx->Xi.u[1] = 0;
1500 mres = sizeof(ctx->Xi);
1501#else
1502 GCM_MUL(ctx);
1503#endif
1504 ctx->ares = 0;
1505 }
1506
1507 if (is_endian.little)
1508# ifdef BSWAP4
1509 ctr = BSWAP4(ctx->Yi.d[3]);
1510# else
1511 ctr = GETU32(ctx->Yi.c + 12);
1512# endif
1513 else
1514 ctr = ctx->Yi.d[3];
1515
1516 n = mres % 16;
1517 if (n) {
1518# if defined(GHASH)
1519 while (n && len) {
1520 ctx->Xn[mres++] = *(out++) = *(in++) ^ ctx->EKi.c[n];
1521 --len;
1522 n = (n + 1) % 16;
1523 }
1524 if (n == 0) {
1525 GHASH(ctx, ctx->Xn, mres);
1526 mres = 0;
1527 } else {
1528 ctx->mres = mres;
1529 return 0;
1530 }
1531# else
1532 while (n && len) {
1533 ctx->Xi.c[n] ^= *(out++) = *(in++) ^ ctx->EKi.c[n];
1534 --len;
1535 n = (n + 1) % 16;
1536 }
1537 if (n == 0) {
1538 GCM_MUL(ctx);
1539 mres = 0;
1540 } else {
1541 ctx->mres = n;
1542 return 0;
1543 }
1544# endif
1545 }
1546# if defined(GHASH)
1547 if (len >= 16 && mres) {
1548 GHASH(ctx, ctx->Xn, mres);
1549 mres = 0;
1550 }
1551# if defined(GHASH_CHUNK)
1552 while (len >= GHASH_CHUNK) {
1553 (*stream) (in, out, GHASH_CHUNK / 16, key, ctx->Yi.c);
1554 ctr += GHASH_CHUNK / 16;
1555 if (is_endian.little)
1556# ifdef BSWAP4
1557 ctx->Yi.d[3] = BSWAP4(ctr);
1558# else
1559 PUTU32(ctx->Yi.c + 12, ctr);
1560# endif
1561 else
1562 ctx->Yi.d[3] = ctr;
1563 GHASH(ctx, out, GHASH_CHUNK);
1564 out += GHASH_CHUNK;
1565 in += GHASH_CHUNK;
1566 len -= GHASH_CHUNK;
1567 }
1568# endif
1569# endif
1570 if ((i = (len & (size_t)-16))) {
1571 size_t j = i / 16;
1572
1573 (*stream) (in, out, j, key, ctx->Yi.c);
1574 ctr += (unsigned int)j;
1575 if (is_endian.little)
1576# ifdef BSWAP4
1577 ctx->Yi.d[3] = BSWAP4(ctr);
1578# else
1579 PUTU32(ctx->Yi.c + 12, ctr);
1580# endif
1581 else
1582 ctx->Yi.d[3] = ctr;
1583 in += i;
1584 len -= i;
1585# if defined(GHASH)
1586 GHASH(ctx, out, i);
1587 out += i;
1588# else
1589 while (j--) {
1590 for (i = 0; i < 16; ++i)
1591 ctx->Xi.c[i] ^= out[i];
1592 GCM_MUL(ctx);
1593 out += 16;
1594 }
1595# endif
1596 }
1597 if (len) {
1598 (*ctx->block) (ctx->Yi.c, ctx->EKi.c, key);
1599 ++ctr;
1600 if (is_endian.little)
1601# ifdef BSWAP4
1602 ctx->Yi.d[3] = BSWAP4(ctr);
1603# else
1604 PUTU32(ctx->Yi.c + 12, ctr);
1605# endif
1606 else
1607 ctx->Yi.d[3] = ctr;
1608 while (len--) {
1609# if defined(GHASH)
1610 ctx->Xn[mres++] = out[n] = in[n] ^ ctx->EKi.c[n];
1611# else
1612 ctx->Xi.c[mres++] ^= out[n] = in[n] ^ ctx->EKi.c[n];
1613# endif
1614 ++n;
1615 }
1616 }
1617
1618 ctx->mres = mres;
1619 return 0;
1620#endif
1621}
1622
1623int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
1624 const unsigned char *in, unsigned char *out,
1625 size_t len, ctr128_f stream)
1626{
1627#if defined(OPENSSL_SMALL_FOOTPRINT)
1628 return CRYPTO_gcm128_decrypt(ctx, in, out, len);
1629#else
1630 const union {
1631 long one;
1632 char little;
1633 } is_endian = { 1 };
1634 unsigned int n, ctr, mres;
1635 size_t i;
1636 u64 mlen = ctx->len.u[1];
1637 void *key = ctx->key;
1638# ifdef GCM_FUNCREF_4BIT
1639 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
1640# ifdef GHASH
1641 void (*gcm_ghash_p) (u64 Xi[2], const u128 Htable[16],
1642 const u8 *inp, size_t len) = ctx->ghash;
1643# endif
1644# endif
1645
1646 mlen += len;
1647 if (mlen > ((U64(1) << 36) - 32) || (sizeof(len) == 8 && mlen < len))
1648 return -1;
1649 ctx->len.u[1] = mlen;
1650
1651 mres = ctx->mres;
1652
1653 if (ctx->ares) {
1654 /* First call to decrypt finalizes GHASH(AAD) */
1655# if defined(GHASH)
1656 if (len == 0) {
1657 GCM_MUL(ctx);
1658 ctx->ares = 0;
1659 return 0;
1660 }
1661 memcpy(ctx->Xn, ctx->Xi.c, sizeof(ctx->Xi));
1662 ctx->Xi.u[0] = 0;
1663 ctx->Xi.u[1] = 0;
1664 mres = sizeof(ctx->Xi);
1665# else
1666 GCM_MUL(ctx);
1667# endif
1668 ctx->ares = 0;
1669 }
1670
1671 if (is_endian.little)
1672# ifdef BSWAP4
1673 ctr = BSWAP4(ctx->Yi.d[3]);
1674# else
1675 ctr = GETU32(ctx->Yi.c + 12);
1676# endif
1677 else
1678 ctr = ctx->Yi.d[3];
1679
1680 n = mres % 16;
1681 if (n) {
1682# if defined(GHASH)
1683 while (n && len) {
1684 *(out++) = (ctx->Xn[mres++] = *(in++)) ^ ctx->EKi.c[n];
1685 --len;
1686 n = (n + 1) % 16;
1687 }
1688 if (n == 0) {
1689 GHASH(ctx, ctx->Xn, mres);
1690 mres = 0;
1691 } else {
1692 ctx->mres = mres;
1693 return 0;
1694 }
1695# else
1696 while (n && len) {
1697 u8 c = *(in++);
1698 *(out++) = c ^ ctx->EKi.c[n];
1699 ctx->Xi.c[n] ^= c;
1700 --len;
1701 n = (n + 1) % 16;
1702 }
1703 if (n == 0) {
1704 GCM_MUL(ctx);
1705 mres = 0;
1706 } else {
1707 ctx->mres = n;
1708 return 0;
1709 }
1710# endif
1711 }
1712# if defined(GHASH)
1713 if (len >= 16 && mres) {
1714 GHASH(ctx, ctx->Xn, mres);
1715 mres = 0;
1716 }
1717# if defined(GHASH_CHUNK)
1718 while (len >= GHASH_CHUNK) {
1719 GHASH(ctx, in, GHASH_CHUNK);
1720 (*stream) (in, out, GHASH_CHUNK / 16, key, ctx->Yi.c);
1721 ctr += GHASH_CHUNK / 16;
1722 if (is_endian.little)
1723# ifdef BSWAP4
1724 ctx->Yi.d[3] = BSWAP4(ctr);
1725# else
1726 PUTU32(ctx->Yi.c + 12, ctr);
1727# endif
1728 else
1729 ctx->Yi.d[3] = ctr;
1730 out += GHASH_CHUNK;
1731 in += GHASH_CHUNK;
1732 len -= GHASH_CHUNK;
1733 }
1734# endif
1735# endif
1736 if ((i = (len & (size_t)-16))) {
1737 size_t j = i / 16;
1738
1739# if defined(GHASH)
1740 GHASH(ctx, in, i);
1741# else
1742 while (j--) {
1743 size_t k;
1744 for (k = 0; k < 16; ++k)
1745 ctx->Xi.c[k] ^= in[k];
1746 GCM_MUL(ctx);
1747 in += 16;
1748 }
1749 j = i / 16;
1750 in -= i;
1751# endif
1752 (*stream) (in, out, j, key, ctx->Yi.c);
1753 ctr += (unsigned int)j;
1754 if (is_endian.little)
1755# ifdef BSWAP4
1756 ctx->Yi.d[3] = BSWAP4(ctr);
1757# else
1758 PUTU32(ctx->Yi.c + 12, ctr);
1759# endif
1760 else
1761 ctx->Yi.d[3] = ctr;
1762 out += i;
1763 in += i;
1764 len -= i;
1765 }
1766 if (len) {
1767 (*ctx->block) (ctx->Yi.c, ctx->EKi.c, key);
1768 ++ctr;
1769 if (is_endian.little)
1770# ifdef BSWAP4
1771 ctx->Yi.d[3] = BSWAP4(ctr);
1772# else
1773 PUTU32(ctx->Yi.c + 12, ctr);
1774# endif
1775 else
1776 ctx->Yi.d[3] = ctr;
1777 while (len--) {
1778# if defined(GHASH)
1779 out[n] = (ctx->Xn[mres++] = in[n]) ^ ctx->EKi.c[n];
1780# else
1781 u8 c = in[n];
1782 ctx->Xi.c[mres++] ^= c;
1783 out[n] = c ^ ctx->EKi.c[n];
1784# endif
1785 ++n;
1786 }
1787 }
1788
1789 ctx->mres = mres;
1790 return 0;
1791#endif
1792}
1793
1794int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx, const unsigned char *tag,
1795 size_t len)
1796{
1797 const union {
1798 long one;
1799 char little;
1800 } is_endian = { 1 };
1801 u64 alen = ctx->len.u[0] << 3;
1802 u64 clen = ctx->len.u[1] << 3;
1803#ifdef GCM_FUNCREF_4BIT
1804 void (*gcm_gmult_p) (u64 Xi[2], const u128 Htable[16]) = ctx->gmult;
1805# if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1806 void (*gcm_ghash_p) (u64 Xi[2], const u128 Htable[16],
1807 const u8 *inp, size_t len) = ctx->ghash;
1808# endif
1809#endif
1810
1811#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1812 u128 bitlen;
1813 unsigned int mres = ctx->mres;
1814
1815 if (mres) {
1816 unsigned blocks = (mres + 15) & -16;
1817
1818 memset(ctx->Xn + mres, 0, blocks - mres);
1819 mres = blocks;
1820 if (mres == sizeof(ctx->Xn)) {
1821 GHASH(ctx, ctx->Xn, mres);
1822 mres = 0;
1823 }
1824 } else if (ctx->ares) {
1825 GCM_MUL(ctx);
1826 }
1827#else
1828 if (ctx->mres || ctx->ares)
1829 GCM_MUL(ctx);
1830#endif
1831
1832 if (is_endian.little) {
1833#ifdef BSWAP8
1834 alen = BSWAP8(alen);
1835 clen = BSWAP8(clen);
1836#else
1837 u8 *p = ctx->len.c;
1838
1839 ctx->len.u[0] = alen;
1840 ctx->len.u[1] = clen;
1841
1842 alen = (u64)GETU32(p) << 32 | GETU32(p + 4);
1843 clen = (u64)GETU32(p + 8) << 32 | GETU32(p + 12);
1844#endif
1845 }
1846
1847#if defined(GHASH) && !defined(OPENSSL_SMALL_FOOTPRINT)
1848 bitlen.hi = alen;
1849 bitlen.lo = clen;
1850 memcpy(ctx->Xn + mres, &bitlen, sizeof(bitlen));
1851 mres += sizeof(bitlen);
1852 GHASH(ctx, ctx->Xn, mres);
1853#else
1854 ctx->Xi.u[0] ^= alen;
1855 ctx->Xi.u[1] ^= clen;
1856 GCM_MUL(ctx);
1857#endif
1858
1859 ctx->Xi.u[0] ^= ctx->EK0.u[0];
1860 ctx->Xi.u[1] ^= ctx->EK0.u[1];
1861
1862 if (tag && len <= sizeof(ctx->Xi))
1863 return CRYPTO_memcmp(ctx->Xi.c, tag, len);
1864 else
1865 return -1;
1866}
1867
1868void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, unsigned char *tag, size_t len)
1869{
1870 CRYPTO_gcm128_finish(ctx, NULL, 0);
1871 memcpy(tag, ctx->Xi.c,
1872 len <= sizeof(ctx->Xi.c) ? len : sizeof(ctx->Xi.c));
1873}
1874
1875GCM128_CONTEXT *CRYPTO_gcm128_new(void *key, block128_f block)
1876{
1877 GCM128_CONTEXT *ret;
1878
1879 if ((ret = OPENSSL_malloc(sizeof(*ret))) != NULL)
1880 CRYPTO_gcm128_init(ret, key, block);
1881
1882 return ret;
1883}
1884
1885void CRYPTO_gcm128_release(GCM128_CONTEXT *ctx)
1886{
1887 OPENSSL_clear_free(ctx, sizeof(*ctx));
1888}
1889