3 * Common definitions for block ciphers
5 * (c) 1999 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Catacomb.
12 * Catacomb is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * Catacomb is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with Catacomb; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 #ifndef CATACOMB_BLKC_H
29 #define CATACOMB_BLKC_H
35 /*----- Header files ------------------------------------------------------*/
39 #include <mLib/bits.h>
41 /*----- Theory of operation -----------------------------------------------*
43 * A block cipher has associated with it a triple, called PRE_CLASS, of the
44 * form `(TYPE, ENDIAN, BITS)', where TYPE is either `N' (representing an
45 * implemented bit size) or `X' (representing an unimplemented bit size,
46 * causing loops to be compiled rather than unrolled code), ENDIAN is `B'
47 * (big) or `L' (little), and BITS is the block size of the cipher in bits.
50 /*----- Data movement macros ----------------------------------------------*/
53 * `The C preprocessor. You will never find a more wretched hive of bogus
54 * hackery. We must be cautious.'
57 /* --- General dispatch macros --- */
59 #define BLKC_DOGLUE(x, y) x ## y
60 #define BLKC_GLUE(x, y) BLKC_DOGLUE(x, y)
61 #define BLKC_APPLY(f, x) f x
62 #define BLKC_FIRST(x, y, z) x
63 #define BLKC_SECOND(x, y, z) y
64 #define BLKC_THIRD(x, y, z) z
65 #define BLKC_TYPE(PRE) BLKC_APPLY(BLKC_FIRST, PRE##_CLASS)
66 #define BLKC_ENDIAN(PRE) BLKC_APPLY(BLKC_SECOND, PRE##_CLASS)
67 #define BLKC_BITS(PRE) BLKC_APPLY(BLKC_THIRD, PRE##_CLASS)
69 #define BLKC_STORE_E(PRE) BLKC_GLUE(STORE32_, BLKC_ENDIAN(PRE))
70 #define BLKC_LOAD_E(PRE) BLKC_GLUE(LOAD32_, BLKC_ENDIAN(PRE))
72 /* --- Interface macros --- */
74 #define BLKC_STORE(PRE, b, w) \
75 BLKC_GLUE(BLKC_STORE_, BLKC_TYPE(PRE)) \
76 (PRE, b, w, BLKC_STORE_E(PRE), BLKC_BITS(PRE))
78 #define BLKC_XSTORE(PRE, b, w, wx) \
79 BLKC_GLUE(BLKC_XSTORE_, BLKC_TYPE(PRE)) \
80 (PRE, b, w, wx, BLKC_STORE_E(PRE), BLKC_BITS(PRE))
82 #define BLKC_LOAD(PRE, w, b) \
83 BLKC_GLUE(BLKC_LOAD_, BLKC_TYPE(PRE)) \
84 (PRE, w, b, BLKC_LOAD_E(PRE), BLKC_BITS(PRE))
86 #define BLKC_XLOAD(PRE, w, b) \
87 BLKC_GLUE(BLKC_XLOAD_, BLKC_TYPE(PRE)) \
88 (PRE, w, b, BLKC_LOAD_E(PRE), BLKC_BITS(PRE))
90 #define BLKC_MOVE(PRE, w, wx) \
91 BLKC_GLUE(BLKC_MOVE_, BLKC_TYPE(PRE)) \
92 (PRE, w, wx, BLKC_BITS(PRE))
94 #define BLKC_XMOVE(PRE, w, wx) \
95 BLKC_GLUE(BLKC_XMOVE_, BLKC_TYPE(PRE)) \
96 (PRE, w, wx, BLKC_BITS(PRE))
98 #define BLKC_STEP(PRE, w) \
99 BLKC_GLUE(BLKC_STEP_X_, BLKC_ENDIAN(PRE)) \
102 #define BLKC_ZERO(PRE, w) \
103 BLKC_GLUE(BLKC_ZERO_, BLKC_TYPE(PRE)) \
104 (PRE, w, BLKC_BITS(PRE))
106 #define BLKC_SET(PRE, w, x) \
107 BLKC_GLUE(BLKC_SET_X_, BLKC_ENDIAN(PRE)) \
110 #define BLKC_SHOW(PRE, tag, w) do { \
111 fputs(tag ": ", stdout); \
112 BLKC_SKEL_X(PRE, BLKC_W(w);, printf("%08x ", *_w++);); \
113 fputc('\n', stdout); \
116 /* --- General implementation skeleton --- */
118 #define BLKC_SKEL(PRE, decl, guts) do { \
123 #define BLKC_P(p) register octet *_p = (octet *)(p)
124 #define BLKC_W(w) register uint32 *_w = (w)
125 #define BLKC_WX(wx) register uint32 *_wx = (wx)
127 /* --- Implementation for unusual block sizes --- */
129 #define BLKC_SKEL_X(PRE, decl, guts) \
130 BLKC_SKEL(PRE, unsigned _i; decl, \
131 for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) { \
135 #define BLKC_STORE_X(PRE, b, w, op, n) \
136 BLKC_SKEL_X(PRE, BLKC_P(b); const BLKC_W(w);, \
137 op(_p, *_w); _p += 4; _w++; )
139 #define BLKC_XSTORE_X(PRE, b, w, wx, op, n) \
140 BLKC_SKEL_X(PRE, BLKC_P(b); const BLKC_W(w); const BLKC_WX(wx);, \
141 op(_p, *_w ^ *_wx); _p += 4; _w++; _wx++; )
143 #define BLKC_LOAD_X(PRE, w, b, op, n) \
144 BLKC_SKEL_X(PRE, const BLKC_P(b); BLKC_W(w);, \
145 *_w = op(_p); _p += 4; _w++; )
147 #define BLKC_XLOAD_X(PRE, w, b, op, n) \
148 BLKC_SKEL_X(PRE, const BLKC_P(b); BLKC_W(w);, \
149 *_w ^= op(_p); _p += 4; _w++; )
151 #define BLKC_MOVE_X(PRE, w, wx, n) \
152 BLKC_SKEL_X(PRE, BLKC_W(w); const BLKC_WX(wx);, \
153 *_w = *_wx; _w++; _wx++; ) \
155 #define BLKC_XMOVE_X(PRE, w, wx, n) \
156 BLKC_SKEL_X(PRE, BLKC_W(w); const BLKC_WX(wx);, \
157 *_w ^= *_wx; _w++; _wx++; ) \
159 #define BLKC_ZERO_X(PRE, w, n) \
160 BLKC_SKEL_X(PRE, BLKC_W(w);, *_w++ = 0;)
162 #define BLKC_STEP_X_B(PRE, w) do { \
163 unsigned _i = PRE##_BLKSZ / 4; BLKC_W(w); uint32 _x = 0; \
164 while (_i && !_x) { _i--; _w[_i] = _x = U32(_w[_i] + 1); } \
167 #define BLKC_STEP_X_L(PRE, w) do { \
168 unsigned _i = 0; BLKC_W(w); uint32 _x = 0; \
169 while (_i < PRE##_BLKSZ / 4 && !_x) \
170 { _w[_i] = _x = U32(_w[_i] + 1); _i++; } \
173 #define BLKC_SET_X_B(PRE, w, x) do { \
174 unsigned _i; BLKC_W(w); unsigned long _x = x; \
175 for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) { \
177 _x = ((_x & ~(unsigned long)MASK32) >> 16) >> 16; \
181 #define BLKC_SET_X_L(PRE, w, x) do { \
182 unsigned _i; BLKC_W(w); unsigned long _x = x; _w += PRE##_BLKSZ / 4; \
183 for (_i = 0; _i < PRE##_BLKSZ / 4; _i++) { \
185 _x = ((_x & ~(unsigned long)MASK32) >> 16) >> 16; \
189 /* --- Implementation for known block sizes --- */
191 #define BLKC_SKEL_64(PRE, decl, op, guts) \
192 BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1);)
194 #define BLKC_SKEL_96(PRE, decl, op, guts) \
195 BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1); guts(op, 2);)
197 #define BLKC_SKEL_128(PRE, decl, op, guts) \
198 BLKC_SKEL(PRE, decl, guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3);)
200 #define BLKC_SKEL_192(PRE, decl, op, guts) \
201 BLKC_SKEL(PRE, decl, \
202 guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3); \
203 guts(op, 4); guts(op, 5);)
205 #define BLKC_SKEL_256(PRE, decl, op, guts) \
206 BLKC_SKEL(PRE, decl, \
207 guts(op, 0); guts(op, 1); guts(op, 2); guts(op, 3); \
208 guts(op, 4); guts(op, 5); guts(op, 6); guts(op, 7);)
210 #define BLKC_STORE_GUTS(op, i) op(_p + 4 * i, _w[i])
211 #define BLKC_XSTORE_GUTS(op, i) op(_p + 4 * i, _w[i] ^ _wx[i])
212 #define BLKC_LOAD_GUTS(op, i) _w[i] = op(_p + 4 * i)
213 #define BLKC_XLOAD_GUTS(op, i) _w[i] ^= op(_p + 4 * i)
214 #define BLKC_MOVE_GUTS(op, i) _w[i] = _wx[i]
215 #define BLKC_XMOVE_GUTS(op, i) _w[i] ^= _wx[i]
216 #define BLKC_ZERO_GUTS(op, i) _w[i] = 0
218 #define BLKC_STORE_N(PRE, b, w, op, n) \
219 BLKC_GLUE(BLKC_SKEL_, n) \
220 (PRE, BLKC_P(b); const BLKC_W(w);, op, BLKC_STORE_GUTS)
222 #define BLKC_XSTORE_N(PRE, b, w, wx, op, n) \
223 BLKC_GLUE(BLKC_SKEL_, n) \
224 (PRE, BLKC_P(b); const BLKC_W(w); const BLKC_WX(wx);, \
225 op, BLKC_XSTORE_GUTS)
227 #define BLKC_LOAD_N(PRE, w, b, op, n) \
228 BLKC_GLUE(BLKC_SKEL_, n) \
229 (PRE, const BLKC_P(b); BLKC_W(w);, op, BLKC_LOAD_GUTS)
231 #define BLKC_XLOAD_N(PRE, w, b, op, n) \
232 BLKC_GLUE(BLKC_SKEL_, n) \
233 (PRE, const BLKC_P(b); BLKC_W(w);, op, BLKC_XLOAD_GUTS)
235 #define BLKC_MOVE_N(PRE, w, wx, n) \
236 BLKC_GLUE(BLKC_SKEL_, n) \
237 (PRE, BLKC_W(w); const BLKC_WX(wx);, op, BLKC_MOVE_GUTS)
239 #define BLKC_ZERO_N(PRE, w, n) \
240 BLKC_GLUE(BLKC_SKEL_, n) \
241 (PRE, BLKC_W(w); , op, BLKC_ZERO_GUTS)
243 #define BLKC_XMOVE_N(PRE, w, wx, n) \
244 BLKC_GLUE(BLKC_SKEL_, n) \
245 (PRE, BLKC_W(w); const BLKC_WX(wx);, op, BLKC_XMOVE_GUTS)
247 /*----- Test rig for block ciphers ----------------------------------------*/
249 /* --- @BLKC_TEST@ --- *
251 * Arguments: @PRE@, @pre@ = prefixes for cipher-specific definitions
253 * Use: Standard test rig for block ciphers.
260 #include <mLib/quis.h>
261 #include <mLib/testrig.h>
263 #define BLKC_VERIFY(PRE, pre) BLKC_VERIFYX(PRE, pre, #pre)
265 #define BLKC_VERIFYX(PRE, pre, name) \
267 static int pre##_verify(dstr *v) \
270 uint32 p[PRE##_BLKSZ / 4]; \
271 uint32 c[PRE##_BLKSZ / 4]; \
272 uint32 d[PRE##_BLKSZ / 4]; \
273 dstr b = DSTR_INIT; \
276 /* --- Initialize the key buffer --- */ \
278 dstr_ensure(&b, PRE##_BLKSZ); \
279 b.len = PRE##_BLKSZ; \
280 pre##_init(&k, v[0].buf, v[0].len); \
281 BLKC_LOAD(PRE, p, v[1].buf); \
282 BLKC_LOAD(PRE, c, v[2].buf); \
284 /* --- Test encryption --- */ \
286 BLKC_MOVE(PRE, d, p); \
287 pre##_eblk(&k, d, d); \
288 BLKC_STORE(PRE, b.buf, d); \
289 if (memcmp(b.buf, v[2].buf, PRE##_BLKSZ)) { \
291 printf("\nfail encryption:" \
293 type_hex.dump(&v[0], stdout); \
294 printf("\n\tplaintext = "); type_hex.dump(&v[1], stdout); \
295 printf("\n\texpected = "); type_hex.dump(&v[2], stdout); \
296 printf("\n\tcalculated = "); type_hex.dump(&b, stdout); \
300 /* --- Test decryption --- */ \
302 BLKC_MOVE(PRE, d, c); \
303 pre##_dblk(&k, d, d); \
304 BLKC_STORE(PRE, b.buf, d); \
305 if (memcmp(b.buf, v[1].buf, PRE##_BLKSZ)) { \
307 printf("\nfail decryption:" \
309 type_hex.dump(&v[0], stdout); \
310 printf("\n\tciphertext = "); type_hex.dump(&v[2], stdout); \
311 printf("\n\texpected = "); type_hex.dump(&v[1], stdout); \
312 printf("\n\tcalculated = "); type_hex.dump(&b, stdout); \
316 /* --- Return --- */ \
321 #define BLKC_TESTDEFS(PRE, pre) BLKC_TESTDEFSX(PRE, pre, #pre)
323 #define BLKC_TESTDEFSX(PRE, pre, name) \
324 { name, pre##_verify, { &type_hex, &type_hex, &type_hex, 0 } },
326 #define BLKC_TESTX(PRE, pre, name, fname) \
328 BLKC_VERIFYX(PRE, pre, name) \
330 static const test_chunk defs[] = { \
331 BLKC_TESTDEFSX(PRE, pre, name) \
335 int main(int argc, char *argv[]) \
337 test_run(argc, argv, defs, SRCDIR"/t/" fname); \
342 # define BLKC_TESTX(PRE, pre, name, fname)
345 #define BLKC_TEST(PRE, pre) BLKC_TESTX(PRE, pre, #pre, #pre)
347 /*----- That's all, folks -------------------------------------------------*/