1 /* $KAME: rijndael-api-fst.c,v 1.10 2001/05/27 09:34:18 itojun Exp $ */
4 * rijndael-api-fst.c v2.3 April '2000
6 * Optimised ANSI C code
8 * authors: v1.0: Antoon Bosselaers
10 * v2.1: Vincent Rijmen
11 * v2.2: Vincent Rijmen
13 * v2.4: Vincent Rijmen
15 * This code is placed in the public domain.
18 #include <sys/cdefs.h>
19 __FBSDID("$FreeBSD$");
21 #include <sys/param.h>
23 #include <sys/systm.h>
28 #include <crypto/rijndael/rijndael_local.h>
29 #include <crypto/rijndael/rijndael-api-fst.h>
35 typedef u_int8_t BYTE;
37 int rijndael_makeKey(keyInstance *key, BYTE direction, int keyLen,
38 const char *keyMaterial) {
39 u_int8_t cipherKey[RIJNDAEL_MAXKB];
42 return BAD_KEY_INSTANCE;
45 if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) {
46 key->direction = direction;
51 if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) {
57 if (keyMaterial != NULL) {
58 memcpy(key->keyMaterial, keyMaterial, keyLen/8);
61 /* initialize key schedule: */
62 memcpy(cipherKey, key->keyMaterial, keyLen/8);
63 if (direction == DIR_ENCRYPT) {
64 key->Nr = rijndaelKeySetupEnc(key->rk, cipherKey, keyLen);
66 key->Nr = rijndaelKeySetupDec(key->rk, cipherKey, keyLen);
68 rijndaelKeySetupEnc(key->ek, cipherKey, keyLen);
72 int rijndael_cipherInit(cipherInstance *cipher, BYTE mode, char *IV) {
73 if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) {
76 return BAD_CIPHER_MODE;
79 memcpy(cipher->IV, IV, RIJNDAEL_MAX_IV_SIZE);
81 memset(cipher->IV, 0, RIJNDAEL_MAX_IV_SIZE);
86 int rijndael_blockEncrypt(cipherInstance *cipher, keyInstance *key,
87 const BYTE *input, int inputLen, BYTE *outBuffer) {
89 u_int8_t block[16], iv[4][4];
93 key->direction == DIR_DECRYPT) {
94 return BAD_CIPHER_STATE;
96 if (input == NULL || inputLen <= 0) {
97 return 0; /* nothing to do */
100 numBlocks = inputLen/128;
102 switch (cipher->mode) {
104 for (i = numBlocks; i > 0; i--) {
105 rijndaelEncrypt(key->rk, key->Nr, input, outBuffer);
112 #if 1 /*STRICT_ALIGN*/
113 memcpy(block, cipher->IV, 16);
114 memcpy(iv, input, 16);
115 ((u_int32_t*)block)[0] ^= ((u_int32_t*)iv)[0];
116 ((u_int32_t*)block)[1] ^= ((u_int32_t*)iv)[1];
117 ((u_int32_t*)block)[2] ^= ((u_int32_t*)iv)[2];
118 ((u_int32_t*)block)[3] ^= ((u_int32_t*)iv)[3];
120 ((u_int32_t*)block)[0] = ((u_int32_t*)cipher->IV)[0] ^ ((u_int32_t*)input)[0];
121 ((u_int32_t*)block)[1] = ((u_int32_t*)cipher->IV)[1] ^ ((u_int32_t*)input)[1];
122 ((u_int32_t*)block)[2] = ((u_int32_t*)cipher->IV)[2] ^ ((u_int32_t*)input)[2];
123 ((u_int32_t*)block)[3] = ((u_int32_t*)cipher->IV)[3] ^ ((u_int32_t*)input)[3];
125 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
127 for (i = numBlocks - 1; i > 0; i--) {
128 #if 1 /*STRICT_ALIGN*/
129 memcpy(block, outBuffer, 16);
130 memcpy(iv, input, 16);
131 ((u_int32_t*)block)[0] ^= ((u_int32_t*)iv)[0];
132 ((u_int32_t*)block)[1] ^= ((u_int32_t*)iv)[1];
133 ((u_int32_t*)block)[2] ^= ((u_int32_t*)iv)[2];
134 ((u_int32_t*)block)[3] ^= ((u_int32_t*)iv)[3];
136 ((u_int32_t*)block)[0] = ((u_int32_t*)outBuffer)[0] ^ ((u_int32_t*)input)[0];
137 ((u_int32_t*)block)[1] = ((u_int32_t*)outBuffer)[1] ^ ((u_int32_t*)input)[1];
138 ((u_int32_t*)block)[2] = ((u_int32_t*)outBuffer)[2] ^ ((u_int32_t*)input)[2];
139 ((u_int32_t*)block)[3] = ((u_int32_t*)outBuffer)[3] ^ ((u_int32_t*)input)[3];
142 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
148 #if 1 /*STRICT_ALIGN*/
149 memcpy(iv, cipher->IV, 16);
150 #else /* !STRICT_ALIGN */
151 *((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV ));
152 *((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
153 *((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
154 *((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
155 #endif /* ?STRICT_ALIGN */
156 for (i = numBlocks; i > 0; i--) {
157 for (k = 0; k < 128; k++) {
158 *((u_int32_t*) block ) = *((u_int32_t*)iv[0]);
159 *((u_int32_t*)(block+ 4)) = *((u_int32_t*)iv[1]);
160 *((u_int32_t*)(block+ 8)) = *((u_int32_t*)iv[2]);
161 *((u_int32_t*)(block+12)) = *((u_int32_t*)iv[3]);
162 rijndaelEncrypt(key->ek, key->Nr, block,
164 outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
165 iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
166 iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
167 iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
168 iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
169 iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
170 iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
171 iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
172 iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
173 iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
174 iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
175 iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
176 iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
177 iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
178 iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
179 iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
180 iv[3][3] = (iv[3][3] << 1) | ((outBuffer[k/8] >> (7-(k&7))) & 1);
186 return BAD_CIPHER_STATE;
189 return 128*numBlocks;
193 * Encrypt data partitioned in octets, using RFC 2040-like padding.
195 * @param input data to be encrypted (octet sequence)
196 * @param inputOctets input length in octets (not bits)
197 * @param outBuffer encrypted output data
199 * @return length in octets (not bits) of the encrypted output buffer.
201 int rijndael_padEncrypt(cipherInstance *cipher, keyInstance *key,
202 const BYTE *input, int inputOctets, BYTE *outBuffer) {
203 int i, numBlocks, padLen;
204 u_int8_t block[16], *iv, *cp;
206 if (cipher == NULL ||
208 key->direction == DIR_DECRYPT) {
209 return BAD_CIPHER_STATE;
211 if (input == NULL || inputOctets <= 0) {
212 return 0; /* nothing to do */
215 numBlocks = inputOctets/16;
217 switch (cipher->mode) {
219 for (i = numBlocks; i > 0; i--) {
220 rijndaelEncrypt(key->rk, key->Nr, input, outBuffer);
224 padLen = 16 - (inputOctets - 16*numBlocks);
225 if (padLen <= 0 || padLen > 16)
226 return BAD_CIPHER_STATE;
227 memcpy(block, input, 16 - padLen);
228 for (cp = block + 16 - padLen; cp < block + 16; cp++)
230 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
235 for (i = numBlocks; i > 0; i--) {
236 ((u_int32_t*)block)[0] = ((const u_int32_t*)input)[0] ^ ((u_int32_t*)iv)[0];
237 ((u_int32_t*)block)[1] = ((const u_int32_t*)input)[1] ^ ((u_int32_t*)iv)[1];
238 ((u_int32_t*)block)[2] = ((const u_int32_t*)input)[2] ^ ((u_int32_t*)iv)[2];
239 ((u_int32_t*)block)[3] = ((const u_int32_t*)input)[3] ^ ((u_int32_t*)iv)[3];
240 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
245 padLen = 16 - (inputOctets - 16*numBlocks);
246 if (padLen <= 0 || padLen > 16)
247 return BAD_CIPHER_STATE;
248 for (i = 0; i < 16 - padLen; i++) {
249 block[i] = input[i] ^ iv[i];
251 for (i = 16 - padLen; i < 16; i++) {
252 block[i] = (BYTE)padLen ^ iv[i];
254 rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
258 return BAD_CIPHER_STATE;
261 return 16*(numBlocks + 1);
264 int rijndael_blockDecrypt(cipherInstance *cipher, keyInstance *key,
265 const BYTE *input, int inputLen, BYTE *outBuffer) {
267 u_int8_t block[16], iv[4][4];
269 if (cipher == NULL ||
271 (cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT)) {
272 return BAD_CIPHER_STATE;
274 if (input == NULL || inputLen <= 0) {
275 return 0; /* nothing to do */
278 numBlocks = inputLen/128;
280 switch (cipher->mode) {
282 for (i = numBlocks; i > 0; i--) {
283 rijndaelDecrypt(key->rk, key->Nr, input, outBuffer);
290 #if 1 /*STRICT_ALIGN */
291 memcpy(iv, cipher->IV, 16);
293 *((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV ));
294 *((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
295 *((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
296 *((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
298 for (i = numBlocks; i > 0; i--) {
299 rijndaelDecrypt(key->rk, key->Nr, input, block);
300 ((u_int32_t*)block)[0] ^= *((u_int32_t*)iv[0]);
301 ((u_int32_t*)block)[1] ^= *((u_int32_t*)iv[1]);
302 ((u_int32_t*)block)[2] ^= *((u_int32_t*)iv[2]);
303 ((u_int32_t*)block)[3] ^= *((u_int32_t*)iv[3]);
304 #if 1 /*STRICT_ALIGN*/
305 memcpy(iv, input, 16);
306 memcpy(outBuffer, block, 16);
308 *((u_int32_t*)iv[0]) = ((u_int32_t*)input)[0]; ((u_int32_t*)outBuffer)[0] = ((u_int32_t*)block)[0];
309 *((u_int32_t*)iv[1]) = ((u_int32_t*)input)[1]; ((u_int32_t*)outBuffer)[1] = ((u_int32_t*)block)[1];
310 *((u_int32_t*)iv[2]) = ((u_int32_t*)input)[2]; ((u_int32_t*)outBuffer)[2] = ((u_int32_t*)block)[2];
311 *((u_int32_t*)iv[3]) = ((u_int32_t*)input)[3]; ((u_int32_t*)outBuffer)[3] = ((u_int32_t*)block)[3];
319 #if 1 /*STRICT_ALIGN */
320 memcpy(iv, cipher->IV, 16);
322 *((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV));
323 *((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
324 *((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
325 *((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
327 for (i = numBlocks; i > 0; i--) {
328 for (k = 0; k < 128; k++) {
329 *((u_int32_t*) block ) = *((u_int32_t*)iv[0]);
330 *((u_int32_t*)(block+ 4)) = *((u_int32_t*)iv[1]);
331 *((u_int32_t*)(block+ 8)) = *((u_int32_t*)iv[2]);
332 *((u_int32_t*)(block+12)) = *((u_int32_t*)iv[3]);
333 rijndaelEncrypt(key->ek, key->Nr, block,
335 iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
336 iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
337 iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
338 iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
339 iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
340 iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
341 iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
342 iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
343 iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
344 iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
345 iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
346 iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
347 iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
348 iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
349 iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
350 iv[3][3] = (iv[3][3] << 1) | ((input[k/8] >> (7-(k&7))) & 1);
351 outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
357 return BAD_CIPHER_STATE;
360 return 128*numBlocks;
363 int rijndael_padDecrypt(cipherInstance *cipher, keyInstance *key,
364 const BYTE *input, int inputOctets, BYTE *outBuffer) {
365 int i, numBlocks, padLen;
369 if (cipher == NULL ||
371 key->direction == DIR_ENCRYPT) {
372 return BAD_CIPHER_STATE;
374 if (input == NULL || inputOctets <= 0) {
375 return 0; /* nothing to do */
377 if (inputOctets % 16 != 0) {
381 numBlocks = inputOctets/16;
383 switch (cipher->mode) {
385 /* all blocks but last */
386 for (i = numBlocks - 1; i > 0; i--) {
387 rijndaelDecrypt(key->rk, key->Nr, input, outBuffer);
392 rijndaelDecrypt(key->rk, key->Nr, input, block);
397 for (i = 16 - padLen; i < 16; i++) {
398 if (block[i] != padLen) {
402 memcpy(outBuffer, block, 16 - padLen);
406 memcpy(iv, cipher->IV, 16);
407 /* all blocks but last */
408 for (i = numBlocks - 1; i > 0; i--) {
409 rijndaelDecrypt(key->rk, key->Nr, input, block);
410 ((u_int32_t*)block)[0] ^= iv[0];
411 ((u_int32_t*)block)[1] ^= iv[1];
412 ((u_int32_t*)block)[2] ^= iv[2];
413 ((u_int32_t*)block)[3] ^= iv[3];
414 memcpy(iv, input, 16);
415 memcpy(outBuffer, block, 16);
420 rijndaelDecrypt(key->rk, key->Nr, input, block);
421 ((u_int32_t*)block)[0] ^= iv[0];
422 ((u_int32_t*)block)[1] ^= iv[1];
423 ((u_int32_t*)block)[2] ^= iv[2];
424 ((u_int32_t*)block)[3] ^= iv[3];
426 if (padLen <= 0 || padLen > 16) {
429 for (i = 16 - padLen; i < 16; i++) {
430 if (block[i] != padLen) {
434 memcpy(outBuffer, block, 16 - padLen);
438 return BAD_CIPHER_STATE;
441 return 16*numBlocks - padLen;