File size: 10,648 Bytes
258fb37 |
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 |
/*---------------------------------------------
* ZUC / EEA3 / EIA3 : LTE security algorithm
*--------------------------------------------*/
#include "zuc.h"
u32 AddM(u32 a, u32 b);
void LFSRWithInitialisationMode(u32 u);
void LFSRWithWorkMode(void);
void BitReorganization(void);
u32 L1(u32 X);
u32 L2(u32 X);
u32 F(void);
void ZUC(u8* k, u8* iv, u32* ks, u32 len);
u32 GET_WORD(u32 * DATA, u32 i);
u8 GET_BIT(u8 * DATA, u32 i);
/*--------------------------------------------
* ZUC keystream generator algorithm
*------------------------------------------*/
/* the state registers of LFSR */
static u32 LFSR_S0;
static u32 LFSR_S1;
static u32 LFSR_S2;
static u32 LFSR_S3;
static u32 LFSR_S4;
static u32 LFSR_S5;
static u32 LFSR_S6;
static u32 LFSR_S7;
static u32 LFSR_S8;
static u32 LFSR_S9;
static u32 LFSR_S10;
static u32 LFSR_S11;
static u32 LFSR_S12;
static u32 LFSR_S13;
static u32 LFSR_S14;
static u32 LFSR_S15;
/* the registers of F */
static u32 F_R1;
static u32 F_R2;
/* the outputs of BitReorganization */
static u32 BRC_X0;
static u32 BRC_X1;
static u32 BRC_X2;
static u32 BRC_X3;
/* the s-boxes */
static u8 S0[256] = {
0x3e,0x72,0x5b,0x47,0xca,0xe0,0x00,0x33,0x04,0xd1,0x54,0x98,0x09,0xb9,0x6d,0xcb,
0x7b,0x1b,0xf9,0x32,0xaf,0x9d,0x6a,0xa5,0xb8,0x2d,0xfc,0x1d,0x08,0x53,0x03,0x90,
0x4d,0x4e,0x84,0x99,0xe4,0xce,0xd9,0x91,0xdd,0xb6,0x85,0x48,0x8b,0x29,0x6e,0xac,
0xcd,0xc1,0xf8,0x1e,0x73,0x43,0x69,0xc6,0xb5,0xbd,0xfd,0x39,0x63,0x20,0xd4,0x38,
0x76,0x7d,0xb2,0xa7,0xcf,0xed,0x57,0xc5,0xf3,0x2c,0xbb,0x14,0x21,0x06,0x55,0x9b,
0xe3,0xef,0x5e,0x31,0x4f,0x7f,0x5a,0xa4,0x0d,0x82,0x51,0x49,0x5f,0xba,0x58,0x1c,
0x4a,0x16,0xd5,0x17,0xa8,0x92,0x24,0x1f,0x8c,0xff,0xd8,0xae,0x2e,0x01,0xd3,0xad,
0x3b,0x4b,0xda,0x46,0xeb,0xc9,0xde,0x9a,0x8f,0x87,0xd7,0x3a,0x80,0x6f,0x2f,0xc8,
0xb1,0xb4,0x37,0xf7,0x0a,0x22,0x13,0x28,0x7c,0xcc,0x3c,0x89,0xc7,0xc3,0x96,0x56,
0x07,0xbf,0x7e,0xf0,0x0b,0x2b,0x97,0x52,0x35,0x41,0x79,0x61,0xa6,0x4c,0x10,0xfe,
0xbc,0x26,0x95,0x88,0x8a,0xb0,0xa3,0xfb,0xc0,0x18,0x94,0xf2,0xe1,0xe5,0xe9,0x5d,
0xd0,0xdc,0x11,0x66,0x64,0x5c,0xec,0x59,0x42,0x75,0x12,0xf5,0x74,0x9c,0xaa,0x23,
0x0e,0x86,0xab,0xbe,0x2a,0x02,0xe7,0x67,0xe6,0x44,0xa2,0x6c,0xc2,0x93,0x9f,0xf1,
0xf6,0xfa,0x36,0xd2,0x50,0x68,0x9e,0x62,0x71,0x15,0x3d,0xd6,0x40,0xc4,0xe2,0x0f,
0x8e,0x83,0x77,0x6b,0x25,0x05,0x3f,0x0c,0x30,0xea,0x70,0xb7,0xa1,0xe8,0xa9,0x65,
0x8d,0x27,0x1a,0xdb,0x81,0xb3,0xa0,0xf4,0x45,0x7a,0x19,0xdf,0xee,0x78,0x34,0x60
};
static u8 S1[256] = {
0x55,0xc2,0x63,0x71,0x3b,0xc8,0x47,0x86,0x9f,0x3c,0xda,0x5b,0x29,0xaa,0xfd,0x77,
0x8c,0xc5,0x94,0x0c,0xa6,0x1a,0x13,0x00,0xe3,0xa8,0x16,0x72,0x40,0xf9,0xf8,0x42,
0x44,0x26,0x68,0x96,0x81,0xd9,0x45,0x3e,0x10,0x76,0xc6,0xa7,0x8b,0x39,0x43,0xe1,
0x3a,0xb5,0x56,0x2a,0xc0,0x6d,0xb3,0x05,0x22,0x66,0xbf,0xdc,0x0b,0xfa,0x62,0x48,
0xdd,0x20,0x11,0x06,0x36,0xc9,0xc1,0xcf,0xf6,0x27,0x52,0xbb,0x69,0xf5,0xd4,0x87,
0x7f,0x84,0x4c,0xd2,0x9c,0x57,0xa4,0xbc,0x4f,0x9a,0xdf,0xfe,0xd6,0x8d,0x7a,0xeb,
0x2b,0x53,0xd8,0x5c,0xa1,0x14,0x17,0xfb,0x23,0xd5,0x7d,0x30,0x67,0x73,0x08,0x09,
0xee,0xb7,0x70,0x3f,0x61,0xb2,0x19,0x8e,0x4e,0xe5,0x4b,0x93,0x8f,0x5d,0xdb,0xa9,
0xad,0xf1,0xae,0x2e,0xcb,0x0d,0xfc,0xf4,0x2d,0x46,0x6e,0x1d,0x97,0xe8,0xd1,0xe9,
0x4d,0x37,0xa5,0x75,0x5e,0x83,0x9e,0xab,0x82,0x9d,0xb9,0x1c,0xe0,0xcd,0x49,0x89,
0x01,0xb6,0xbd,0x58,0x24,0xa2,0x5f,0x38,0x78,0x99,0x15,0x90,0x50,0xb8,0x95,0xe4,
0xd0,0x91,0xc7,0xce,0xed,0x0f,0xb4,0x6f,0xa0,0xcc,0xf0,0x02,0x4a,0x79,0xc3,0xde,
0xa3,0xef,0xea,0x51,0xe6,0x6b,0x18,0xec,0x1b,0x2c,0x80,0xf7,0x74,0xe7,0xff,0x21,
0x5a,0x6a,0x54,0x1e,0x41,0x31,0x92,0x35,0xc4,0x33,0x07,0x0a,0xba,0x7e,0x0e,0x34,
0x88,0xb1,0x98,0x7c,0xf3,0x3d,0x60,0x6c,0x7b,0xca,0xd3,0x1f,0x32,0x65,0x04,0x28,
0x64,0xbe,0x85,0x9b,0x2f,0x59,0x8a,0xd7,0xb0,0x25,0xac,0xaf,0x12,0x03,0xe2,0xf2
};
/* the constants D */
static u32 EK_d[16] = {
0x44D7, 0x26BC, 0x626B, 0x135E, 0x5789, 0x35E2, 0x7135, 0x09AF,
0x4D78, 0x2F13, 0x6BC4, 0x1AF1, 0x5E26, 0x3C4D, 0x789A, 0x47AC
};
/* c = a + b mod (2^31 - 1) */
u32 AddM(u32 a, u32 b)
{
u32 c = a + b;
return (c & 0x7FFFFFFF) + (c >> 31);
}
/* LFSR with initialization mode */
#define MulByPow2(x, k) ((((x) << k) | ((x) >> (31 - k))) & 0x7FFFFFFF)
void LFSRWithInitialisationMode(u32 u)
{
u32 f, v;
f = LFSR_S0;
v = MulByPow2(LFSR_S0, 8);
f = AddM(f, v);
v = MulByPow2(LFSR_S4, 20);
f = AddM(f, v);
v = MulByPow2(LFSR_S10, 21);
f = AddM(f, v);
v = MulByPow2(LFSR_S13, 17);
f = AddM(f, v);
v = MulByPow2(LFSR_S15, 15);
f = AddM(f, v);
f = AddM(f, u);
/* update the state */
LFSR_S0 = LFSR_S1;
LFSR_S1 = LFSR_S2;
LFSR_S2 = LFSR_S3;
LFSR_S3 = LFSR_S4;
LFSR_S4 = LFSR_S5;
LFSR_S5 = LFSR_S6;
LFSR_S6 = LFSR_S7;
LFSR_S7 = LFSR_S8;
LFSR_S8 = LFSR_S9;
LFSR_S9 = LFSR_S10;
LFSR_S10 = LFSR_S11;
LFSR_S11 = LFSR_S12;
LFSR_S12 = LFSR_S13;
LFSR_S13 = LFSR_S14;
LFSR_S14 = LFSR_S15;
LFSR_S15 = f;
}
/* LFSR with work mode */
void LFSRWithWorkMode(void)
{
u32 f, v;
f = LFSR_S0;
v = MulByPow2(LFSR_S0, 8);
f = AddM(f, v);
v = MulByPow2(LFSR_S4, 20);
f = AddM(f, v);
v = MulByPow2(LFSR_S10, 21);
f = AddM(f, v);
v = MulByPow2(LFSR_S13, 17);
f = AddM(f, v);
v = MulByPow2(LFSR_S15, 15);
f = AddM(f, v);
/* update the state */
LFSR_S0 = LFSR_S1;
LFSR_S1 = LFSR_S2;
LFSR_S2 = LFSR_S3;
LFSR_S3 = LFSR_S4;
LFSR_S4 = LFSR_S5;
LFSR_S5 = LFSR_S6;
LFSR_S6 = LFSR_S7;
LFSR_S7 = LFSR_S8;
LFSR_S8 = LFSR_S9;
LFSR_S9 = LFSR_S10;
LFSR_S10 = LFSR_S11;
LFSR_S11 = LFSR_S12;
LFSR_S12 = LFSR_S13;
LFSR_S13 = LFSR_S14;
LFSR_S14 = LFSR_S15;
LFSR_S15 = f;
}
/* BitReorganization */
void BitReorganization(void)
{
BRC_X0 = ((LFSR_S15 & 0x7FFF8000) << 1) | (LFSR_S14 & 0xFFFF);
BRC_X1 = ((LFSR_S11 & 0xFFFF) << 16) | (LFSR_S9 >> 15);
BRC_X2 = ((LFSR_S7 & 0xFFFF) << 16) | (LFSR_S5 >> 15);
BRC_X3 = ((LFSR_S2 & 0xFFFF) << 16) | (LFSR_S0 >> 15);
}
#define ROT(a, k) (((a) << k) | ((a) >> (32 - k)))
/* L1 */
u32 L1(u32 X)
{
return (X ^ ROT(X, 2) ^ ROT(X, 10) ^ ROT(X, 18) ^ ROT(X, 24));
}
/* L2 */
u32 L2(u32 X)
{
return (X ^ ROT(X, 8) ^ ROT(X, 14) ^ ROT(X, 22) ^ ROT(X, 30));
}
#define MAKEU32(a, b, c, d) (((u32)(a) << 24) | ((u32)(b) << 16) | ((u32)(c) << 8) | ((u32)(d)))
/* F */
u32 F(void)
{
u32 W, W1, W2, u, v;
W = (BRC_X0 ^ F_R1) + F_R2;
W1 = F_R1 + BRC_X1;
W2 = F_R2 ^ BRC_X2;
u = L1((W1 << 16) | (W2 >> 16));
v = L2((W2 << 16) | (W1 >> 16));
F_R1 = MAKEU32(S0[u >> 24], S1[(u >> 16) & 0xFF],
S0[(u >> 8) & 0xFF], S1[u & 0xFF]);
F_R2 = MAKEU32(S0[v >> 24], S1[(v >> 16) & 0xFF],
S0[(v >> 8) & 0xFF], S1[v & 0xFF]);
return W;
}
#define MAKEU31(a, b, c) (((u32)(a) << 23) | ((u32)(b) << 8) | (u32)(c))
/* initialize */
void zuc_initialize(u8* k, u8* iv)
{
u32 w, nCount;
/* expand key */
LFSR_S0 = MAKEU31(k[0], EK_d[0], iv[0]);
LFSR_S1 = MAKEU31(k[1], EK_d[1], iv[1]);
LFSR_S2 = MAKEU31(k[2], EK_d[2], iv[2]);
LFSR_S3 = MAKEU31(k[3], EK_d[3], iv[3]);
LFSR_S4 = MAKEU31(k[4], EK_d[4], iv[4]);
LFSR_S5 = MAKEU31(k[5], EK_d[5], iv[5]);
LFSR_S6 = MAKEU31(k[6], EK_d[6], iv[6]);
LFSR_S7 = MAKEU31(k[7], EK_d[7], iv[7]);
LFSR_S8 = MAKEU31(k[8], EK_d[8], iv[8]);
LFSR_S9 = MAKEU31(k[9], EK_d[9], iv[9]);
LFSR_S10 = MAKEU31(k[10], EK_d[10], iv[10]);
LFSR_S11 = MAKEU31(k[11], EK_d[11], iv[11]);
LFSR_S12 = MAKEU31(k[12], EK_d[12], iv[12]);
LFSR_S13 = MAKEU31(k[13], EK_d[13], iv[13]);
LFSR_S14 = MAKEU31(k[14], EK_d[14], iv[14]);
LFSR_S15 = MAKEU31(k[15], EK_d[15], iv[15]);
/* set F_R1 and F_R2 to zero */
F_R1 = 0;
F_R2 = 0;
nCount = 32;
while (nCount > 0)
{
BitReorganization();
w = F();
LFSRWithInitialisationMode(w >> 1);
nCount --;
}
}
void zuc_generate_key_stream(u32* pKeystream, u32 KeystreamLen)
{
int i;
BitReorganization();
F(); /* discard the output of F */
LFSRWithWorkMode();
for (i = 0; i < KeystreamLen; i ++)
{
BitReorganization();
pKeystream[i] = F() ^ BRC_X3;
LFSRWithWorkMode();
}
}
/* The ZUC algorithm, see ref. [3]*/
void ZUC(u8* k, u8* iv, u32* ks, u32 len)
{
/* The initialization of ZUC, see page 17 of ref. [3]*/
zuc_initialize(k, iv);
/* The procedure of generating keystream of ZUC, see page 18 of ref. [3]*/
zuc_generate_key_stream(ks, len);
}
/* end of ZUC.c */
/*-----------------------------------------------------
* EEA3
*---------------------------------------------------*/
/*
* EEA3: LTE Encryption Algorithm 3
* EEA3.c
*/
void zuc_eea3(u8* CK, u32 COUNT, u32 BEARER, u32 DIRECTION,
u32 LENGTH, u8* M, u8* C)
{
u32 *z, L, L8, i;
u8 IV[16];
u32 lastbits = (8-(LENGTH%8))%8;
L = (LENGTH+31)/32;
z = (u32 *) ogs_malloc(L*sizeof(u32));
ogs_assert(z);
L8 = (LENGTH+7)/8;
IV[0] = (COUNT>>24) & 0xFF;
IV[1] = (COUNT>>16) & 0xFF;
IV[2] = (COUNT>>8) & 0xFF;
IV[3] = COUNT & 0xFF;
IV[4] = ((BEARER << 3) | ((DIRECTION&1)<<2)) & 0xFC;
IV[5] = 0;
IV[6] = 0;
IV[7] = 0;
IV[8] = IV[0];
IV[9] = IV[1];
IV[10] = IV[2];
IV[11] = IV[3];
IV[12] = IV[4];
IV[13] = IV[5];
IV[14] = IV[6];
IV[15] = IV[7];
ZUC(CK, IV, z, L);
for (i=0; i<L8; i++)
{
C[i] = M[i] ^ ((z[i/4] >> (3-i%4)*8) & 0xff);
}
/*
* Issues #3349
* Valgrind memcheck: Invalid read & write: Add {}.
*/
/* zero last bits of data in case its length is not word-aligned (32 bits)
this is an addition to the C reference code, which did not handle it */
if (lastbits) {
i--;
C[i] &= 0x100 - (1<<lastbits);
}
ogs_free(z);
}
/* end of EEA3.c */
/*-----------------------------------------------------
* EIA3
*---------------------------------------------------*/
/*
* EIA3: LTE Integrity computation algorithm
* EIA3.c
*/
u32 GET_WORD(u32 * DATA, u32 i)
{
u32 WORD, ti;
ti = i % 32;
if (ti == 0)
WORD = DATA[i/32];
else
WORD = (DATA[i/32]<<ti) | (DATA[i/32+1]>>(32-ti));
return WORD;
}
u8 GET_BIT(u8 * DATA, u32 i)
{
return (DATA[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
}
void zuc_eia3(u8* IK, u32 COUNT, u32 BEARER, u32 DIRECTION,
u32 LENGTH, u8* M, u32* MAC)
{
u32 *z, N, L, T, i;
u8 IV[16];
IV[0] = (COUNT>>24) & 0xFF;
IV[1] = (COUNT>>16) & 0xFF;
IV[2] = (COUNT>>8) & 0xFF;
IV[3] = COUNT & 0xFF;
IV[4] = (BEARER << 3) & 0xF8;
IV[5] = IV[6] = IV[7] = 0;
IV[8] = ((COUNT>>24) & 0xFF) ^ ((DIRECTION&1)<<7);
IV[9] = (COUNT>>16) & 0xFF;
IV[10] = (COUNT>>8) & 0xFF;
IV[11] = COUNT & 0xFF;
IV[12] = IV[4];
IV[13] = IV[5];
IV[14] = IV[6] ^ ((DIRECTION&1)<<7);
IV[15] = IV[7];
N = LENGTH + 64;
L = (N + 31) / 32;
z = (u32 *) ogs_malloc(L*sizeof(u32));
ogs_assert(z);
ZUC(IK, IV, z, L);
T = 0;
for (i=0; i<LENGTH; i++) {
if (GET_BIT(M,i)) {
T ^= GET_WORD(z,i);
}
}
T ^= GET_WORD(z,LENGTH);
*MAC = T ^ z[L-1];
ogs_free(z);
}
/* end of EIA3.c */
|