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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 | /* * The GOST 28147-89 cipher * * This is based on the 25 Movember 1993 draft translation * by Aleksandr Malchik, with Whitfield Diffie, of the Government * Standard of the U.S.S.R. GOST 28149-89, "Cryptographic Transformation * Algorithm", effective 1 July 1990. (Whitfield.Diffie@eng.sun.com) * * That is a draft, and may contain errors, which will be faithfully * reflected here, along with possible exciting new bugs. * * Some details have been cleared up by the paper "Soviet Encryption * Algorithm" by Josef Pieprzyk and Leonid Tombak of the University * of Wollongong, New South Wales. (josef/leo@cs.adfa.oz.au) * * The standard is written by A. Zabotin (project leader), G.P. Glazkov, * and V.B. Isaeva. It was accepted and introduced into use by the * action of the State Standards Committee of the USSR on 2 June 89 as * No. 1409. It was to be reviewed in 1993, but whether anyone wishes * to take on this obligation from the USSR is questionable. * * This code is placed in the public domain. */ /* * If you read the standard, it belabors the point of copying corresponding * bits from point A to point B quite a bit. It helps to understand that * the standard is uniformly little-endian, although it numbers bits from * 1 rather than 0, so bit n has value 2^(n-1). The least significant bit * of the 32-bit words that are manipulated in the algorithm is the first, * lowest-numbered, in the bit string. */ /* A 32-bit data type */ #ifdef __alpha /* Any other 64-bit machines? */ typedef unsigned int word32; #else typedef unsigned long word32; #endif /* * The standard does not specify the contents of the 8 4 bit->4 bit * substitution boxes, saying they're a parameter of the network * being set up. For illustration purposes here, I have used * the first rows of the 8 S-boxes from the DES. (Note that the * DES S-boxes are numbered starting from 1 at the msb. In keeping * with the rest of the GOST, I have used little-endian numbering. * Thus, k8 is S-box 1. * * Obviously, a careful look at the cryptographic properties of the cipher * must be undertaken before "production" substitution boxes are defined. * * The standard also does not specify a standard bit-string representation * for the contents of these blocks. */ static unsigned char const k8[16] = { 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7 }; static unsigned char const k7[16] = { 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10 }; static unsigned char const k6[16] = { 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8 }; static unsigned char const k5[16] = { 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15 }; static unsigned char const k4[16] = { 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9 }; static unsigned char const k3[16] = { 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11 }; static unsigned char const k2[16] = { 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1 }; static unsigned char const k1[16] = { 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7 }; /* Byte-at-a-time substitution boxes */ static unsigned char k87[256]; static unsigned char k65[256]; static unsigned char k43[256]; static unsigned char k21[256]; /* * Build byte-at-a-time subtitution tables. * This must be called once for global setup. */ void kboxinit(void) { int i; for (i = 0; i < 256; i++) { k87[i] = k8[i >> 4] << 4 | k7[i & 15]; k65[i] = k6[i >> 4] << 4 | k5[i & 15]; k43[i] = k4[i >> 4] << 4 | k3[i & 15]; k21[i] = k2[i >> 4] << 4 | k1[i & 15]; } } /* * Do the substitution and rotation that are the core of the operation, * like the expansion, substitution and permutation of the DES. * It would be possible to perform DES-like optimisations and store * the table entries as 32-bit words, already rotated, but the * efficiency gain is questionable. * * This should be inlined for maximum speed */ #if __GNUC__ __inline__ #endif static word32 f(word32 x) { /* Do substitutions */ #if 0 /* This is annoyingly slow */ x = k8[x>>28 & 15] << 28 | k7[x>>24 & 15] << 24 | k6[x>>20 & 15] << 20 | k5[x>>16 & 15] << 16 | k4[x>>12 & 15] << 12 | k3[x>> 8 & 15] << 8 | k2[x>> 4 & 15] << 4 | k1[x & 15]; #else /* This is faster */ x = k87[x>>24 & 255] << 24 | k65[x>>16 & 255] << 16 | k43[x>> 8 & 255] << 8 | k21[x & 255]; #endif /* Rotate left 11 bits */ return x<<11 | x>>(32-11); } /* * The GOST standard defines the input in terms of bits 1..64, with * bit 1 being the lsb of in[0] and bit 64 being the msb of in[1]. * * The keys are defined similarly, with bit 256 being the msb of key[7]. */ void gostcrypt(word32 const in[2], word32 out[2], word32 const key[8]) { register word32 n1, n2; /* As named in the GOST */ n1 = in[0]; n2 = in[1]; /* Instead of swapping halves, swap names each round */ n2 ^= f(n1+key[0]); n1 ^= f(n2+key[1]); n2 ^= f(n1+key[2]); n1 ^= f(n2+key[3]); n2 ^= f(n1+key[4]); n1 ^= f(n2+key[5]); n2 ^= f(n1+key[6]); n1 ^= f(n2+key[7]); n2 ^= f(n1+key[0]); n1 ^= f(n2+key[1]); n2 ^= f(n1+key[2]); n1 ^= f(n2+key[3]); n2 ^= f(n1+key[4]); n1 ^= f(n2+key[5]); n2 ^= f(n1+key[6]); n1 ^= f(n2+key[7]); n2 ^= f(n1+key[0]); n1 ^= f(n2+key[1]); n2 ^= f(n1+key[2]); n1 ^= f(n2+key[3]); n2 ^= f(n1+key[4]); n1 ^= f(n2+key[5]); n2 ^= f(n1+key[6]); n1 ^= f(n2+key[7]); n2 ^= f(n1+key[7]); n1 ^= f(n2+key[6]); n2 ^= f(n1+key[5]); n1 ^= f(n2+key[4]); n2 ^= f(n1+key[3]); n1 ^= f(n2+key[2]); n2 ^= f(n1+key[1]); n1 ^= f(n2+key[0]); /* There is no swap after the last round */ out[0] = n2; out[1] = n1; } /* * The key schedule is somewhat different for decryption. * (The key table is used once forward and three times backward.) * You could define an expanded key, or just write the code twice, * as done here. */ void gostdecrypt(word32 const in[2], word32 out[2], word32 const key[8]) { register word32 n1, n2; /* As named in the GOST */ n1 = in[0]; n2 = in[1]; n2 ^= f(n1+key[0]); n1 ^= f(n2+key[1]); n2 ^= f(n1+key[2]); n1 ^= f(n2+key[3]); n2 ^= f(n1+key[4]); n1 ^= f(n2+key[5]); n2 ^= f(n1+key[6]); n1 ^= f(n2+key[7]); n2 ^= f(n1+key[7]); n1 ^= f(n2+key[6]); n2 ^= f(n1+key[5]); n1 ^= f(n2+key[4]); n2 ^= f(n1+key[3]); n1 ^= f(n2+key[2]); n2 ^= f(n1+key[1]); n1 ^= f(n2+key[0]); n2 ^= f(n1+key[7]); n1 ^= f(n2+key[6]); n2 ^= f(n1+key[5]); n1 ^= f(n2+key[4]); n2 ^= f(n1+key[3]); n1 ^= f(n2+key[2]); n2 ^= f(n1+key[1]); n1 ^= f(n2+key[0]); n2 ^= f(n1+key[7]); n1 ^= f(n2+key[6]); n2 ^= f(n1+key[5]); n1 ^= f(n2+key[4]); n2 ^= f(n1+key[3]); n1 ^= f(n2+key[2]); n2 ^= f(n1+key[1]); n1 ^= f(n2+key[0]); out[0] = n2; out[1] = n1; } /* * The GOST "Output feedback" standard. It seems closer morally * to the counter feedback mode some people have proposed for DES. * The avoidance of the short cycles that are possible in OFB seems * like a Good Thing. * * Calling it the stream mode makes more sense. * * The IV is encrypted with the key to produce the initial counter value. * Then, for each output block, a constant is added, modulo 2^32-1 * (0 is represented as all-ones, not all-zeros), to each half of * the counter, and the counter is encrypted to produce the value * to XOR with the output. * * Len is the number of blocks. Sub-block encryption is * left as an exercise for the user. Remember that the * standard defines everything in a little-endian manner, * so you want to use the low bit of gamma[0] first. * * OFB is, of course, self-inverse, so there is only one function. */ /* The constants for addition */ #define C1 0x01010104 #define C2 0x01010101 void gostofb(word32 const *in, word32 *out, int len, word32 const iv[2], word32 const key[8]) { word32 temp[2]; /* Counter */ word32 gamma[2]; /* Output XOR value */ /* Compute starting value for counter */ gostcrypt(iv, temp, key); while (len--) { temp[0] += C2; if (temp[0] < C2) /* Wrap modulo 2^32? */ temp[0]++; /* Make it modulo 2^32-1 */ temp[1] += C1; if (temp[1] < C1) /* Wrap modulo 2^32? */ temp[1]++; /* Make it modulo 2^32-1 */ gostcrypt(temp, gamma, key); *out++ = *in++ ^ gamma[0]; *out++ = *in++ ^ gamma[1]; } } /* * The CFB mode is just what you'd expect. Each block of ciphertext y[] is * derived from the input x[] by the following pseudocode: * y[i] = x[i] ^ gostcrypt(y[i-1]) * x[i] = y[i] ^ gostcrypt(y[i-1]) * Where y[-1] is the IV. * * The IV is modified in place. Again, len is in *blocks*. */ void gostcfbencrypt(word32 const *in, word32 *out, int len, word32 iv[2], word32 const key[8]) { while (len--) { gostcrypt(iv, iv, key); iv[0] = *out++ ^= iv[0]; iv[1] = *out++ ^= iv[1]; } } void gostcfbdecrypt(word32 const *in, word32 *out, int len, word32 iv[2], word32 const key[8]) { word32 t; while (len--) { gostcrypt(iv, iv, key); t = *out; *out++ ^= iv[0]; iv[0] = t; t = *out; *out++ ^= iv[1]; iv[1] = t; } } /* * The message suthetication code uses only 16 of the 32 rounds. * There *is* a swap after the 16th round. * The last block should be padded to 64 bits with zeros. * len is the number of *blocks* in the input. */ void gostmac(word32 const *in, int len, word32 out[2], word32 const key[8]) { register word32 n1, n2; /* As named in the GOST */ n1 = 0; n2 = 0; while (len--) { n1 ^= *in++; n2 = *in++; /* Instead of swapping halves, swap names each round */ n2 ^= f(n1+key[0]); n1 ^= f(n2+key[1]); n2 ^= f(n1+key[2]); n1 ^= f(n2+key[3]); n2 ^= f(n1+key[4]); n1 ^= f(n2+key[5]); n2 ^= f(n1+key[6]); n1 ^= f(n2+key[7]); n2 ^= f(n1+key[0]); n1 ^= f(n2+key[1]); n2 ^= f(n1+key[2]); n1 ^= f(n2+key[3]); n2 ^= f(n1+key[4]); n1 ^= f(n2+key[5]); n2 ^= f(n1+key[6]); n1 ^= f(n2+key[7]); } out[0] = n1; out[1] = n2; } #define TEST 1 #ifdef TEST #include <stdio.h> #include <stdlib.h> /* Designed to cope with 15-bit rand() implementations */ #define RAND32 ((word32)rand() << 17 ^ (word32)rand() << 9 ^ rand()) int main(int argc, char *argv[]) { word32 key[8]; word32 plain[2]; word32 cipher[2]; int i, j; kboxinit(); printf("GOST 21847-89 test driver.\n"); for (i = 0; i < 1000; i++) { for (j = 0; j < 8; j++) key[j] = RAND32; plain[0] = RAND32; plain[1] = RAND32; printf("%3d\r", i); fflush(stdout); gostcrypt(plain, cipher, key); for (j = 0; j < 99; j++) gostcrypt(cipher, cipher, key); for (j = 0; j < 100; j++) gostdecrypt(cipher, cipher, key); if (plain[0] != cipher[0] || plain[1] != cipher[1]) { fprintf(stderr, "\nError! i = %d\n", i); return 1; } } printf("All tests passed.\n"); return 0; } #endif /* TEST */ |
/*
 * The GOST 28147-89 cipher
 *
 * This is based on the 25 Movember 1993 draft translation
 * by Aleksandr Malchik, with Whitfield Diffie, of the Government
 * Standard of the U.S.S.R. GOST 28149-89, "Cryptographic Transformation
 * Algorithm", effective 1 July 1990.  (Whitfield.Diffie@eng.sun.com)
 *
 * That is a draft, and may contain errors, which will be faithfully
 * reflected here, along with possible exciting new bugs.
 *
 * Some details have been cleared up by the paper "Soviet Encryption
 * Algorithm" by Josef Pieprzyk and Leonid Tombak of the University
 * of Wollongong, New South Wales.  (josef/leo@cs.adfa.oz.au)
 *
 * The standard is written by A. Zabotin (project leader), G.P. Glazkov,
 * and V.B. Isaeva.  It was accepted and introduced into use by the
 * action of the State Standards Committee of the USSR on 2 June 89 as
 * No. 1409.  It was to be reviewed in 1993, but whether anyone wishes
 * to take on this obligation from the USSR is questionable.
 *
 * This code is placed in the public domain.
 */

/*
 * If you read the standard, it belabors the point of copying corresponding
 * bits from point A to point B quite a bit.  It helps to understand that
 * the standard is uniformly little-endian, although it numbers bits from
 * 1 rather than 0, so bit n has value 2^(n-1).  The least significant bit
 * of the 32-bit words that are manipulated in the algorithm is the first,
 * lowest-numbered, in the bit string.
 */


/* A 32-bit data type */
#ifdef __alpha  /* Any other 64-bit machines? */
typedef unsigned int word32;
#else
typedef unsigned long word32;
#endif

/*
 * The standard does not specify the contents of the 8 4 bit->4 bit
 * substitution boxes, saying they're a parameter of the network
 * being set up.  For illustration purposes here, I have used
 * the first rows of the 8 S-boxes from the DES.  (Note that the
 * DES S-boxes are numbered starting from 1 at the msb.  In keeping
 * with the rest of the GOST, I have used little-endian numbering.
 * Thus, k8 is S-box 1.
 *
 * Obviously, a careful look at the cryptographic properties of the cipher
 * must be undertaken before "production" substitution boxes are defined.
 *
 * The standard also does not specify a standard bit-string representation
 * for the contents of these blocks.
 */
static unsigned char const k8[16] = {
	14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7 };
static unsigned char const k7[16] = {
	15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10 };
static unsigned char const k6[16] = {
	10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8 };
static unsigned char const k5[16] = {
	 7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15 };
static unsigned char const k4[16] = {
	 2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9 };
static unsigned char const k3[16] = {
	12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11 };
static unsigned char const k2[16] = {
	 4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1 };
static unsigned char const k1[16] = {
	13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7 };

/* Byte-at-a-time substitution boxes */
static unsigned char k87[256];
static unsigned char k65[256];
static unsigned char k43[256];
static unsigned char k21[256];

/*
 * Build byte-at-a-time subtitution tables.
 * This must be called once for global setup.
 */
void
kboxinit(void)
{
	int i;
	for (i = 0; i < 256; i++) {
		k87[i] = k8[i >> 4] << 4 | k7[i & 15];
		k65[i] = k6[i >> 4] << 4 | k5[i & 15];
		k43[i] = k4[i >> 4] << 4 | k3[i & 15];
		k21[i] = k2[i >> 4] << 4 | k1[i & 15];
	}
}

/*
 * Do the substitution and rotation that are the core of the operation,
 * like the expansion, substitution and permutation of the DES.
 * It would be possible to perform DES-like optimisations and store
 * the table entries as 32-bit words, already rotated, but the
 * efficiency gain is questionable.
 *
 * This should be inlined for maximum speed
 */
#if __GNUC__
__inline__
#endif
static word32
f(word32 x)
{
	/* Do substitutions */
#if 0
	/* This is annoyingly slow */
	x = k8[x>>28 & 15] << 28 | k7[x>>24 & 15] << 24 |
	    k6[x>>20 & 15] << 20 | k5[x>>16 & 15] << 16 |
	    k4[x>>12 & 15] << 12 | k3[x>> 8 & 15] <<  8 |
	    k2[x>> 4 & 15] <<  4 | k1[x     & 15];
#else
	/* This is faster */
	x = k87[x>>24 & 255] << 24 | k65[x>>16 & 255] << 16 |
	    k43[x>> 8 & 255] <<  8 | k21[x & 255];
#endif

	/* Rotate left 11 bits */
	return x<<11 | x>>(32-11);
}

/*
 * The GOST standard defines the input in terms of bits 1..64, with
 * bit 1 being the lsb of in[0] and bit 64 being the msb of in[1].
 *
 * The keys are defined similarly, with bit 256 being the msb of key[7].
 */
void
gostcrypt(word32 const in[2], word32 out[2], word32 const key[8])
{
	register word32 n1, n2; /* As named in the GOST */

	n1 = in[0];
	n2 = in[1];

	/* Instead of swapping halves, swap names each round */
	n2 ^= f(n1+key[0]);
	n1 ^= f(n2+key[1]);
	n2 ^= f(n1+key[2]);
	n1 ^= f(n2+key[3]);
	n2 ^= f(n1+key[4]);
	n1 ^= f(n2+key[5]);
	n2 ^= f(n1+key[6]);
	n1 ^= f(n2+key[7]);

	n2 ^= f(n1+key[0]);
	n1 ^= f(n2+key[1]);
	n2 ^= f(n1+key[2]);
	n1 ^= f(n2+key[3]);
	n2 ^= f(n1+key[4]);
	n1 ^= f(n2+key[5]);
	n2 ^= f(n1+key[6]);
	n1 ^= f(n2+key[7]);

	n2 ^= f(n1+key[0]);
	n1 ^= f(n2+key[1]);
	n2 ^= f(n1+key[2]);
	n1 ^= f(n2+key[3]);
	n2 ^= f(n1+key[4]);
	n1 ^= f(n2+key[5]);
	n2 ^= f(n1+key[6]);
	n1 ^= f(n2+key[7]);

	n2 ^= f(n1+key[7]);
	n1 ^= f(n2+key[6]);
	n2 ^= f(n1+key[5]);
	n1 ^= f(n2+key[4]);
	n2 ^= f(n1+key[3]);
	n1 ^= f(n2+key[2]);
	n2 ^= f(n1+key[1]);
	n1 ^= f(n2+key[0]);

	/* There is no swap after the last round */
	out[0] = n2;
	out[1] = n1;
}


/*
 * The key schedule is somewhat different for decryption.
 * (The key table is used once forward and three times backward.)
 * You could define an expanded key, or just write the code twice,
 * as done here.
 */
void
gostdecrypt(word32 const in[2], word32 out[2], word32 const key[8])
{
	register word32 n1, n2; /* As named in the GOST */

	n1 = in[0];
	n2 = in[1];

	n2 ^= f(n1+key[0]);
	n1 ^= f(n2+key[1]);
	n2 ^= f(n1+key[2]);
	n1 ^= f(n2+key[3]);
	n2 ^= f(n1+key[4]);
	n1 ^= f(n2+key[5]);
	n2 ^= f(n1+key[6]);
	n1 ^= f(n2+key[7]);

	n2 ^= f(n1+key[7]);
	n1 ^= f(n2+key[6]);
	n2 ^= f(n1+key[5]);
	n1 ^= f(n2+key[4]);
	n2 ^= f(n1+key[3]);
	n1 ^= f(n2+key[2]);
	n2 ^= f(n1+key[1]);
	n1 ^= f(n2+key[0]);

	n2 ^= f(n1+key[7]);
	n1 ^= f(n2+key[6]);
	n2 ^= f(n1+key[5]);
	n1 ^= f(n2+key[4]);
	n2 ^= f(n1+key[3]);
	n1 ^= f(n2+key[2]);
	n2 ^= f(n1+key[1]);
	n1 ^= f(n2+key[0]);

	n2 ^= f(n1+key[7]);
	n1 ^= f(n2+key[6]);
	n2 ^= f(n1+key[5]);
	n1 ^= f(n2+key[4]);
	n2 ^= f(n1+key[3]);
	n1 ^= f(n2+key[2]);
	n2 ^= f(n1+key[1]);
	n1 ^= f(n2+key[0]);

	out[0] = n2;
	out[1] = n1;
}

/*
 * The GOST "Output feedback" standard.  It seems closer morally
 * to the counter feedback mode some people have proposed for DES.
 * The avoidance of the short cycles that are possible in OFB seems
 * like a Good Thing.
 *
 * Calling it the stream mode makes more sense.
 *
 * The IV is encrypted with the key to produce the initial counter value.
 * Then, for each output block, a constant is added, modulo 2^32-1
 * (0 is represented as all-ones, not all-zeros), to each half of
 * the counter, and the counter is encrypted to produce the value
 * to XOR with the output.
 *
 * Len is the number of blocks.  Sub-block encryption is
 * left as an exercise for the user.  Remember that the
 * standard defines everything in a little-endian manner,
 * so you want to use the low bit of gamma[0] first.
 *
 * OFB is, of course, self-inverse, so there is only one function.
 */

/* The constants for addition */
#define C1 0x01010104
#define C2 0x01010101

void
gostofb(word32 const *in, word32 *out, int len,
	word32 const iv[2], word32 const key[8])
{
	word32 temp[2];         /* Counter */
	word32 gamma[2];        /* Output XOR value */

	/* Compute starting value for counter */
	gostcrypt(iv, temp, key);

	while (len--) {
		temp[0] += C2;
		if (temp[0] < C2)       /* Wrap modulo 2^32? */
			temp[0]++;      /* Make it modulo 2^32-1 */
		temp[1] += C1;
		if (temp[1] < C1)       /* Wrap modulo 2^32? */
			temp[1]++;      /* Make it modulo 2^32-1 */

		gostcrypt(temp, gamma, key);

		*out++ = *in++ ^ gamma[0];
		*out++ = *in++ ^ gamma[1];
	}
}

/*
 * The CFB mode is just what you'd expect.  Each block of ciphertext y[] is
 * derived from the input x[] by the following pseudocode:
 * y[i] = x[i] ^ gostcrypt(y[i-1])
 * x[i] = y[i] ^ gostcrypt(y[i-1])
 * Where y[-1] is the IV.
 *
 * The IV is modified in place.  Again, len is in *blocks*.
 */

void
gostcfbencrypt(word32 const *in, word32 *out, int len,
	       word32 iv[2], word32 const key[8])
{
	while (len--) {
		gostcrypt(iv, iv, key);
		iv[0] = *out++ ^= iv[0];
		iv[1] = *out++ ^= iv[1];
	}
}

void
gostcfbdecrypt(word32 const *in, word32 *out, int len,
	       word32 iv[2], word32 const key[8])
{
	word32 t;
	while (len--) {
		gostcrypt(iv, iv, key);
		t = *out;
		*out++ ^= iv[0];
		iv[0] = t;
		t = *out;
		*out++ ^= iv[1];
		iv[1] = t;
	}
}


/*
 * The message suthetication code uses only 16 of the 32 rounds.
 * There *is* a swap after the 16th round.
 * The last block should be padded to 64 bits with zeros.
 * len is the number of *blocks* in the input.
 */
void
gostmac(word32 const *in, int len, word32 out[2], word32 const key[8])
{
	register word32 n1, n2; /* As named in the GOST */

	n1 = 0;
	n2 = 0;

	while (len--) {
		n1 ^= *in++;
		n2 = *in++;

		/* Instead of swapping halves, swap names each round */
		n2 ^= f(n1+key[0]);
		n1 ^= f(n2+key[1]);
		n2 ^= f(n1+key[2]);
		n1 ^= f(n2+key[3]);
		n2 ^= f(n1+key[4]);
		n1 ^= f(n2+key[5]);
		n2 ^= f(n1+key[6]);
		n1 ^= f(n2+key[7]);

		n2 ^= f(n1+key[0]);
		n1 ^= f(n2+key[1]);
		n2 ^= f(n1+key[2]);
		n1 ^= f(n2+key[3]);
		n2 ^= f(n1+key[4]);
		n1 ^= f(n2+key[5]);
		n2 ^= f(n1+key[6]);
		n1 ^= f(n2+key[7]);
	}

	out[0] = n1;
	out[1] = n2;
}


#define TEST 1
#ifdef TEST

#include <stdio.h>
#include <stdlib.h>

/* Designed to cope with 15-bit rand() implementations */
#define RAND32 ((word32)rand() << 17 ^ (word32)rand() << 9 ^ rand())

int main(int argc, char *argv[])
{
	word32 key[8];
	word32 plain[2];
	word32 cipher[2];
	int i, j;

	kboxinit();

	printf("GOST 21847-89 test driver.\n");

	for (i = 0; i < 1000; i++) {
		for (j = 0; j < 8; j++)
			key[j] = RAND32;
		plain[0] = RAND32;
		plain[1] = RAND32;

		printf("%3d\r", i);
		fflush(stdout);

		gostcrypt(plain, cipher, key);
		for (j = 0; j < 99; j++)
			gostcrypt(cipher, cipher, key);
		for (j = 0; j < 100; j++)
			gostdecrypt(cipher, cipher, key);

		if (plain[0] != cipher[0] || plain[1] != cipher[1]) {
			fprintf(stderr, "\nError! i = %d\n", i);
			return 1;
		}
	}
	printf("All tests passed.\n");
	return 0;
}

#endif /* TEST */

-
upload with new input
-
result: Success time: 0.05s memory: 2732 kB returned value: 0
GOST 21847-89 test driver. 0 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 All tests passed.