1 /* SHA256-based Unix crypt implementation.
2 Released into the Public Domain by Ulrich Drepper <drepper@redhat.com>. */
3 /* Windows VC++ port by Pierre Joye <pierre@php.net> */
4
5 #include "php.h"
6 #include "php_main.h"
7
8 #include <errno.h>
9 #include <limits.h>
10
11 #ifdef PHP_WIN32
12 # define __alignof__ __alignof
13 # define alloca _alloca
14 #else
15 # ifndef HAVE_ALIGNOF
16 # include <stddef.h>
17 # define __alignof__(type) offsetof (struct { char c; type member;}, member)
18 # endif
19 #endif
20
21 #include <stdio.h>
22 #include <stdlib.h>
23
24 #ifdef PHP_WIN32
25 # include <string.h>
26 #else
27 # include <sys/param.h>
28 # include <sys/types.h>
29 # include <string.h>
30 #endif
31
__php_stpncpy(char * dst,const char * src,size_t len)32 char * __php_stpncpy(char *dst, const char *src, size_t len)
33 {
34 size_t n = strlen(src);
35 if (n > len) {
36 n = len;
37 }
38 return strncpy(dst, src, len) + n;
39 }
40
__php_mempcpy(void * dst,const void * src,size_t len)41 void * __php_mempcpy(void * dst, const void * src, size_t len)
42 {
43 return (((char *)memcpy(dst, src, len)) + len);
44 }
45
46 #ifndef MIN
47 # define MIN(a, b) (((a) < (b)) ? (a) : (b))
48 #endif
49 #ifndef MAX
50 # define MAX(a, b) (((a) > (b)) ? (a) : (b))
51 #endif
52
53 /* Structure to save state of computation between the single steps. */
54 struct sha256_ctx {
55 uint32_t H[8];
56
57 uint32_t total[2];
58 uint32_t buflen;
59 char buffer[128]; /* NB: always correctly aligned for uint32_t. */
60 };
61
62 #if defined(PHP_WIN32) || (!defined(WORDS_BIGENDIAN))
63 # define SWAP(n) \
64 (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
65 #else
66 # define SWAP(n) (n)
67 #endif
68
69 /* This array contains the bytes used to pad the buffer to the next
70 64-byte boundary. (FIPS 180-2:5.1.1) */
71 static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
72
73
74 /* Constants for SHA256 from FIPS 180-2:4.2.2. */
75 static const uint32_t K[64] = {
76 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
77 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
78 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
79 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
80 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
81 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
82 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
83 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
84 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
85 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
86 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
87 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
88 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
89 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
90 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
91 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
92 };
93
94
95 /* Process LEN bytes of BUFFER, accumulating context into CTX.
96 It is assumed that LEN % 64 == 0. */
sha256_process_block(const void * buffer,size_t len,struct sha256_ctx * ctx)97 static void sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx) {
98 const uint32_t *words = buffer;
99 size_t nwords = len / sizeof (uint32_t);
100 unsigned int t;
101
102 uint32_t a = ctx->H[0];
103 uint32_t b = ctx->H[1];
104 uint32_t c = ctx->H[2];
105 uint32_t d = ctx->H[3];
106 uint32_t e = ctx->H[4];
107 uint32_t f = ctx->H[5];
108 uint32_t g = ctx->H[6];
109 uint32_t h = ctx->H[7];
110
111 /* First increment the byte count. FIPS 180-2 specifies the possible
112 length of the file up to 2^64 bits. Here we only compute the
113 number of bytes. Do a double word increment. */
114 ctx->total[0] += (uint32_t)len;
115 if (ctx->total[0] < len) {
116 ++ctx->total[1];
117 }
118
119 /* Process all bytes in the buffer with 64 bytes in each round of
120 the loop. */
121 while (nwords > 0) {
122 uint32_t W[64];
123 uint32_t a_save = a;
124 uint32_t b_save = b;
125 uint32_t c_save = c;
126 uint32_t d_save = d;
127 uint32_t e_save = e;
128 uint32_t f_save = f;
129 uint32_t g_save = g;
130 uint32_t h_save = h;
131
132 /* Operators defined in FIPS 180-2:4.1.2. */
133 #define Ch(x, y, z) ((x & y) ^ (~x & z))
134 #define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
135 #define S0(x) (CYCLIC (x, 2) ^ CYCLIC (x, 13) ^ CYCLIC (x, 22))
136 #define S1(x) (CYCLIC (x, 6) ^ CYCLIC (x, 11) ^ CYCLIC (x, 25))
137 #define R0(x) (CYCLIC (x, 7) ^ CYCLIC (x, 18) ^ (x >> 3))
138 #define R1(x) (CYCLIC (x, 17) ^ CYCLIC (x, 19) ^ (x >> 10))
139
140 /* It is unfortunate that C does not provide an operator for
141 cyclic rotation. Hope the C compiler is smart enough. */
142 #define CYCLIC(w, s) ((w >> s) | (w << (32 - s)))
143
144 /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2. */
145 for (t = 0; t < 16; ++t) {
146 W[t] = SWAP (*words);
147 ++words;
148 }
149 for (t = 16; t < 64; ++t)
150 W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
151
152 /* The actual computation according to FIPS 180-2:6.2.2 step 3. */
153 for (t = 0; t < 64; ++t) {
154 uint32_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
155 uint32_t T2 = S0 (a) + Maj (a, b, c);
156 h = g;
157 g = f;
158 f = e;
159 e = d + T1;
160 d = c;
161 c = b;
162 b = a;
163 a = T1 + T2;
164 }
165
166 /* Add the starting values of the context according to FIPS 180-2:6.2.2
167 step 4. */
168 a += a_save;
169 b += b_save;
170 c += c_save;
171 d += d_save;
172 e += e_save;
173 f += f_save;
174 g += g_save;
175 h += h_save;
176
177 /* Prepare for the next round. */
178 nwords -= 16;
179 }
180
181 /* Put checksum in context given as argument. */
182 ctx->H[0] = a;
183 ctx->H[1] = b;
184 ctx->H[2] = c;
185 ctx->H[3] = d;
186 ctx->H[4] = e;
187 ctx->H[5] = f;
188 ctx->H[6] = g;
189 ctx->H[7] = h;
190 }
191
192
193 /* Initialize structure containing state of computation.
194 (FIPS 180-2:5.3.2) */
sha256_init_ctx(struct sha256_ctx * ctx)195 static void sha256_init_ctx(struct sha256_ctx *ctx) {
196 ctx->H[0] = 0x6a09e667;
197 ctx->H[1] = 0xbb67ae85;
198 ctx->H[2] = 0x3c6ef372;
199 ctx->H[3] = 0xa54ff53a;
200 ctx->H[4] = 0x510e527f;
201 ctx->H[5] = 0x9b05688c;
202 ctx->H[6] = 0x1f83d9ab;
203 ctx->H[7] = 0x5be0cd19;
204
205 ctx->total[0] = ctx->total[1] = 0;
206 ctx->buflen = 0;
207 }
208
209
210 /* Process the remaining bytes in the internal buffer and the usual
211 prolog according to the standard and write the result to RESBUF.
212
213 IMPORTANT: On some systems it is required that RESBUF is correctly
214 aligned for a 32 bits value. */
sha256_finish_ctx(struct sha256_ctx * ctx,void * resbuf)215 static void * sha256_finish_ctx(struct sha256_ctx *ctx, void *resbuf) {
216 /* Take yet unprocessed bytes into account. */
217 uint32_t bytes = ctx->buflen;
218 size_t pad;
219 unsigned int i;
220
221 /* Now count remaining bytes. */
222 ctx->total[0] += bytes;
223 if (ctx->total[0] < bytes) {
224 ++ctx->total[1];
225 }
226
227 pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
228 memcpy(&ctx->buffer[bytes], fillbuf, pad);
229
230 /* Put the 64-bit file length in *bits* at the end of the buffer. */
231 *(uint32_t *) &ctx->buffer[bytes + pad + 4] = SWAP (ctx->total[0] << 3);
232 *(uint32_t *) &ctx->buffer[bytes + pad] = SWAP ((ctx->total[1] << 3) |
233 (ctx->total[0] >> 29));
234
235 /* Process last bytes. */
236 sha256_process_block(ctx->buffer, bytes + pad + 8, ctx);
237
238 /* Put result from CTX in first 32 bytes following RESBUF. */
239 for (i = 0; i < 8; ++i) {
240 ((uint32_t *) resbuf)[i] = SWAP(ctx->H[i]);
241 }
242
243 return resbuf;
244 }
245
246
sha256_process_bytes(const void * buffer,size_t len,struct sha256_ctx * ctx)247 static void sha256_process_bytes(const void *buffer, size_t len, struct sha256_ctx *ctx) {
248 /* When we already have some bits in our internal buffer concatenate
249 both inputs first. */
250 if (ctx->buflen != 0) {
251 size_t left_over = ctx->buflen;
252 size_t add = 128 - left_over > len ? len : 128 - left_over;
253
254 memcpy(&ctx->buffer[left_over], buffer, add);
255 ctx->buflen += (uint32_t)add;
256
257 if (ctx->buflen > 64) {
258 sha256_process_block(ctx->buffer, ctx->buflen & ~63, ctx);
259 ctx->buflen &= 63;
260 /* The regions in the following copy operation cannot overlap. */
261 memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~63], ctx->buflen);
262 }
263
264 buffer = (const char *) buffer + add;
265 len -= add;
266 }
267
268 /* Process available complete blocks. */
269 if (len >= 64) {
270 /* To check alignment gcc has an appropriate operator. Other
271 compilers don't. */
272 #if __GNUC__ >= 2
273 # define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0)
274 #else
275 # define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint32_t) != 0)
276 #endif
277 if (UNALIGNED_P (buffer))
278 while (len > 64) {
279 sha256_process_block(memcpy(ctx->buffer, buffer, 64), 64, ctx);
280 buffer = (const char *) buffer + 64;
281 len -= 64;
282 } else {
283 sha256_process_block(buffer, len & ~63, ctx);
284 buffer = (const char *) buffer + (len & ~63);
285 len &= 63;
286 }
287 }
288
289 /* Move remaining bytes into internal buffer. */
290 if (len > 0) {
291 size_t left_over = ctx->buflen;
292
293 memcpy(&ctx->buffer[left_over], buffer, len);
294 left_over += len;
295 if (left_over >= 64) {
296 sha256_process_block(ctx->buffer, 64, ctx);
297 left_over -= 64;
298 memcpy(ctx->buffer, &ctx->buffer[64], left_over);
299 }
300 ctx->buflen = (uint32_t)left_over;
301 }
302 }
303
304
305 /* Define our magic string to mark salt for SHA256 "encryption"
306 replacement. */
307 static const char sha256_salt_prefix[] = "$5$";
308
309 /* Prefix for optional rounds specification. */
310 static const char sha256_rounds_prefix[] = "rounds=";
311
312 /* Maximum salt string length. */
313 #define SALT_LEN_MAX 16
314 /* Default number of rounds if not explicitly specified. */
315 #define ROUNDS_DEFAULT 5000
316 /* Minimum number of rounds. */
317 #define ROUNDS_MIN 1000
318 /* Maximum number of rounds. */
319 #define ROUNDS_MAX 999999999
320
321 /* Table with characters for base64 transformation. */
322 static const char b64t[64] =
323 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
324
php_sha256_crypt_r(const char * key,const char * salt,char * buffer,int buflen)325 char * php_sha256_crypt_r(const char *key, const char *salt, char *buffer, int buflen)
326 {
327 #ifdef PHP_WIN32
328 ZEND_SET_ALIGNED(32, unsigned char alt_result[32]);
329 ZEND_SET_ALIGNED(32, unsigned char temp_result[32]);
330 #else
331 ZEND_SET_ALIGNED(__alignof__ (uint32_t), unsigned char alt_result[32]);
332 ZEND_SET_ALIGNED(__alignof__ (uint32_t), unsigned char temp_result[32]);
333 #endif
334
335 struct sha256_ctx ctx;
336 struct sha256_ctx alt_ctx;
337 size_t salt_len;
338 size_t key_len;
339 size_t cnt;
340 char *cp;
341 char *copied_key = NULL;
342 char *copied_salt = NULL;
343 char *p_bytes;
344 char *s_bytes;
345 /* Default number of rounds. */
346 size_t rounds = ROUNDS_DEFAULT;
347 zend_bool rounds_custom = 0;
348
349 /* Find beginning of salt string. The prefix should normally always
350 be present. Just in case it is not. */
351 if (strncmp(sha256_salt_prefix, salt, sizeof(sha256_salt_prefix) - 1) == 0) {
352 /* Skip salt prefix. */
353 salt += sizeof(sha256_salt_prefix) - 1;
354 }
355
356 if (strncmp(salt, sha256_rounds_prefix, sizeof(sha256_rounds_prefix) - 1) == 0) {
357 const char *num = salt + sizeof(sha256_rounds_prefix) - 1;
358 char *endp;
359 zend_ulong srounds = ZEND_STRTOUL(num, &endp, 10);
360 if (*endp == '$') {
361 salt = endp + 1;
362 if (srounds < ROUNDS_MIN || srounds > ROUNDS_MAX) {
363 return NULL;
364 }
365
366 rounds = srounds;
367 rounds_custom = 1;
368 }
369 }
370
371 salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
372 key_len = strlen(key);
373
374 if ((uintptr_t)key % __alignof__ (uint32_t) != 0) {
375 char *tmp = (char *) alloca(key_len + __alignof__(uint32_t));
376 key = copied_key = memcpy(tmp + __alignof__(uint32_t) - (uintptr_t)tmp % __alignof__(uint32_t), key, key_len);
377 }
378
379 if ((uintptr_t)salt % __alignof__(uint32_t) != 0) {
380 char *tmp = (char *) alloca(salt_len + 1 + __alignof__(uint32_t));
381 salt = copied_salt =
382 memcpy(tmp + __alignof__(uint32_t) - (uintptr_t)tmp % __alignof__ (uint32_t), salt, salt_len);
383 copied_salt[salt_len] = 0;
384 }
385
386 /* Prepare for the real work. */
387 sha256_init_ctx(&ctx);
388
389 /* Add the key string. */
390 sha256_process_bytes(key, key_len, &ctx);
391
392 /* The last part is the salt string. This must be at most 16
393 characters and it ends at the first `$' character (for
394 compatibility with existing implementations). */
395 sha256_process_bytes(salt, salt_len, &ctx);
396
397
398 /* Compute alternate SHA256 sum with input KEY, SALT, and KEY. The
399 final result will be added to the first context. */
400 sha256_init_ctx(&alt_ctx);
401
402 /* Add key. */
403 sha256_process_bytes(key, key_len, &alt_ctx);
404
405 /* Add salt. */
406 sha256_process_bytes(salt, salt_len, &alt_ctx);
407
408 /* Add key again. */
409 sha256_process_bytes(key, key_len, &alt_ctx);
410
411 /* Now get result of this (32 bytes) and add it to the other
412 context. */
413 sha256_finish_ctx(&alt_ctx, alt_result);
414
415 /* Add for any character in the key one byte of the alternate sum. */
416 for (cnt = key_len; cnt > 32; cnt -= 32) {
417 sha256_process_bytes(alt_result, 32, &ctx);
418 }
419 sha256_process_bytes(alt_result, cnt, &ctx);
420
421 /* Take the binary representation of the length of the key and for every
422 1 add the alternate sum, for every 0 the key. */
423 for (cnt = key_len; cnt > 0; cnt >>= 1) {
424 if ((cnt & 1) != 0) {
425 sha256_process_bytes(alt_result, 32, &ctx);
426 } else {
427 sha256_process_bytes(key, key_len, &ctx);
428 }
429 }
430
431 /* Create intermediate result. */
432 sha256_finish_ctx(&ctx, alt_result);
433
434 /* Start computation of P byte sequence. */
435 sha256_init_ctx(&alt_ctx);
436
437 /* For every character in the password add the entire password. */
438 for (cnt = 0; cnt < key_len; ++cnt) {
439 sha256_process_bytes(key, key_len, &alt_ctx);
440 }
441
442 /* Finish the digest. */
443 sha256_finish_ctx(&alt_ctx, temp_result);
444
445 /* Create byte sequence P. */
446 cp = p_bytes = alloca(key_len);
447 for (cnt = key_len; cnt >= 32; cnt -= 32) {
448 cp = __php_mempcpy((void *)cp, (const void *)temp_result, 32);
449 }
450 memcpy(cp, temp_result, cnt);
451
452 /* Start computation of S byte sequence. */
453 sha256_init_ctx(&alt_ctx);
454
455 /* For every character in the password add the entire password. */
456 for (cnt = 0; cnt < (size_t) (16 + alt_result[0]); ++cnt) {
457 sha256_process_bytes(salt, salt_len, &alt_ctx);
458 }
459
460 /* Finish the digest. */
461 sha256_finish_ctx(&alt_ctx, temp_result);
462
463 /* Create byte sequence S. */
464 cp = s_bytes = alloca(salt_len);
465 for (cnt = salt_len; cnt >= 32; cnt -= 32) {
466 cp = __php_mempcpy(cp, temp_result, 32);
467 }
468 memcpy(cp, temp_result, cnt);
469
470 /* Repeatedly run the collected hash value through SHA256 to burn
471 CPU cycles. */
472 for (cnt = 0; cnt < rounds; ++cnt) {
473 /* New context. */
474 sha256_init_ctx(&ctx);
475
476 /* Add key or last result. */
477 if ((cnt & 1) != 0) {
478 sha256_process_bytes(p_bytes, key_len, &ctx);
479 } else {
480 sha256_process_bytes(alt_result, 32, &ctx);
481 }
482
483 /* Add salt for numbers not divisible by 3. */
484 if (cnt % 3 != 0) {
485 sha256_process_bytes(s_bytes, salt_len, &ctx);
486 }
487
488 /* Add key for numbers not divisible by 7. */
489 if (cnt % 7 != 0) {
490 sha256_process_bytes(p_bytes, key_len, &ctx);
491 }
492
493 /* Add key or last result. */
494 if ((cnt & 1) != 0) {
495 sha256_process_bytes(alt_result, 32, &ctx);
496 } else {
497 sha256_process_bytes(p_bytes, key_len, &ctx);
498 }
499
500 /* Create intermediate result. */
501 sha256_finish_ctx(&ctx, alt_result);
502 }
503
504 /* Now we can construct the result string. It consists of three
505 parts. */
506 cp = __php_stpncpy(buffer, sha256_salt_prefix, MAX(0, buflen));
507 buflen -= sizeof(sha256_salt_prefix) - 1;
508
509 if (rounds_custom) {
510 #ifdef PHP_WIN32
511 int n = _snprintf(cp, MAX(0, buflen), "%s" ZEND_ULONG_FMT "$", sha256_rounds_prefix, rounds);
512 #else
513 int n = snprintf(cp, MAX(0, buflen), "%s%zu$", sha256_rounds_prefix, rounds);
514 #endif
515 cp += n;
516 buflen -= n;
517 }
518
519 cp = __php_stpncpy(cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
520 buflen -= MIN(MAX (0, buflen), (int)salt_len);
521
522 if (buflen > 0) {
523 *cp++ = '$';
524 --buflen;
525 }
526
527 #define b64_from_24bit(B2, B1, B0, N) \
528 do { \
529 unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0); \
530 int n = (N); \
531 while (n-- > 0 && buflen > 0) \
532 { \
533 *cp++ = b64t[w & 0x3f]; \
534 --buflen; \
535 w >>= 6; \
536 } \
537 } while (0)
538
539 b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4);
540 b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4);
541 b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4);
542 b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4);
543 b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4);
544 b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4);
545 b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4);
546 b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4);
547 b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4);
548 b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4);
549 b64_from_24bit(0, alt_result[31], alt_result[30], 3);
550 if (buflen <= 0) {
551 errno = ERANGE;
552 buffer = NULL;
553 } else
554 *cp = '\0'; /* Terminate the string. */
555
556 /* Clear the buffer for the intermediate result so that people
557 attaching to processes or reading core dumps cannot get any
558 information. We do it in this way to clear correct_words[]
559 inside the SHA256 implementation as well. */
560 sha256_init_ctx(&ctx);
561 sha256_finish_ctx(&ctx, alt_result);
562 ZEND_SECURE_ZERO(temp_result, sizeof(temp_result));
563 ZEND_SECURE_ZERO(p_bytes, key_len);
564 ZEND_SECURE_ZERO(s_bytes, salt_len);
565 ZEND_SECURE_ZERO(&ctx, sizeof(ctx));
566 ZEND_SECURE_ZERO(&alt_ctx, sizeof(alt_ctx));
567
568 if (copied_key != NULL) {
569 ZEND_SECURE_ZERO(copied_key, key_len);
570 }
571 if (copied_salt != NULL) {
572 ZEND_SECURE_ZERO(copied_salt, salt_len);
573 }
574
575 return buffer;
576 }
577
578
579 /* This entry point is equivalent to the `crypt' function in Unix
580 libcs. */
php_sha256_crypt(const char * key,const char * salt)581 char * php_sha256_crypt(const char *key, const char *salt)
582 {
583 /* We don't want to have an arbitrary limit in the size of the
584 password. We can compute an upper bound for the size of the
585 result in advance and so we can prepare the buffer we pass to
586 `sha256_crypt_r'. */
587 ZEND_TLS char *buffer;
588 ZEND_TLS int buflen = 0;
589 int needed = (sizeof(sha256_salt_prefix) - 1
590 + sizeof(sha256_rounds_prefix) + 9 + 1
591 + (int)strlen(salt) + 1 + 43 + 1);
592
593 if (buflen < needed) {
594 char *new_buffer = (char *) realloc(buffer, needed);
595 if (new_buffer == NULL) {
596 return NULL;
597 }
598
599 buffer = new_buffer;
600 buflen = needed;
601 }
602
603 return php_sha256_crypt_r(key, salt, buffer, buflen);
604 }
605
606
607 #ifdef TEST
608 static const struct
609 {
610 const char *input;
611 const char result[32];
612 } tests[] =
613 {
614 /* Test vectors from FIPS 180-2: appendix B.1. */
615 { "abc",
616 "\xba\x78\x16\xbf\x8f\x01\xcf\xea\x41\x41\x40\xde\x5d\xae\x22\x23"
617 "\xb0\x03\x61\xa3\x96\x17\x7a\x9c\xb4\x10\xff\x61\xf2\x00\x15\xad" },
618 /* Test vectors from FIPS 180-2: appendix B.2. */
619 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
620 "\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
621 "\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1" },
622 /* Test vectors from the NESSIE project. */
623 { "",
624 "\xe3\xb0\xc4\x42\x98\xfc\x1c\x14\x9a\xfb\xf4\xc8\x99\x6f\xb9\x24"
625 "\x27\xae\x41\xe4\x64\x9b\x93\x4c\xa4\x95\x99\x1b\x78\x52\xb8\x55" },
626 { "a",
627 "\xca\x97\x81\x12\xca\x1b\xbd\xca\xfa\xc2\x31\xb3\x9a\x23\xdc\x4d"
628 "\xa7\x86\xef\xf8\x14\x7c\x4e\x72\xb9\x80\x77\x85\xaf\xee\x48\xbb" },
629 { "message digest",
630 "\xf7\x84\x6f\x55\xcf\x23\xe1\x4e\xeb\xea\xb5\xb4\xe1\x55\x0c\xad"
631 "\x5b\x50\x9e\x33\x48\xfb\xc4\xef\xa3\xa1\x41\x3d\x39\x3c\xb6\x50" },
632 { "abcdefghijklmnopqrstuvwxyz",
633 "\x71\xc4\x80\xdf\x93\xd6\xae\x2f\x1e\xfa\xd1\x44\x7c\x66\xc9\x52"
634 "\x5e\x31\x62\x18\xcf\x51\xfc\x8d\x9e\xd8\x32\xf2\xda\xf1\x8b\x73" },
635 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
636 "\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
637 "\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1" },
638 { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
639 "\xdb\x4b\xfc\xbd\x4d\xa0\xcd\x85\xa6\x0c\x3c\x37\xd3\xfb\xd8\x80"
640 "\x5c\x77\xf1\x5f\xc6\xb1\xfd\xfe\x61\x4e\xe0\xa7\xc8\xfd\xb4\xc0" },
641 { "123456789012345678901234567890123456789012345678901234567890"
642 "12345678901234567890",
643 "\xf3\x71\xbc\x4a\x31\x1f\x2b\x00\x9e\xef\x95\x2d\xd8\x3c\xa8\x0e"
644 "\x2b\x60\x02\x6c\x8e\x93\x55\x92\xd0\xf9\xc3\x08\x45\x3c\x81\x3e" }
645 };
646 #define ntests (sizeof (tests) / sizeof (tests[0]))
647
648
649 static const struct
650 {
651 const char *salt;
652 const char *input;
653 const char *expected;
654 } tests2[] =
655 {
656 { "$5$saltstring", "Hello world!",
657 "$5$saltstring$5B8vYYiY.CVt1RlTTf8KbXBH3hsxY/GNooZaBBGWEc5" },
658 { "$5$rounds=10000$saltstringsaltstring", "Hello world!",
659 "$5$rounds=10000$saltstringsaltst$3xv.VbSHBb41AL9AvLeujZkZRBAwqFMz2."
660 "opqey6IcA" },
661 { "$5$rounds=5000$toolongsaltstring", "This is just a test",
662 "$5$rounds=5000$toolongsaltstrin$Un/5jzAHMgOGZ5.mWJpuVolil07guHPvOW8"
663 "mGRcvxa5" },
664 { "$5$rounds=1400$anotherlongsaltstring",
665 "a very much longer text to encrypt. This one even stretches over more"
666 "than one line.",
667 "$5$rounds=1400$anotherlongsalts$Rx.j8H.h8HjEDGomFU8bDkXm3XIUnzyxf12"
668 "oP84Bnq1" },
669 { "$5$rounds=77777$short",
670 "we have a short salt string but not a short password",
671 "$5$rounds=77777$short$JiO1O3ZpDAxGJeaDIuqCoEFysAe1mZNJRs3pw0KQRd/" },
672 { "$5$rounds=123456$asaltof16chars..", "a short string",
673 "$5$rounds=123456$asaltof16chars..$gP3VQ/6X7UUEW3HkBn2w1/Ptq2jxPyzV/"
674 "cZKmF/wJvD" },
675 { "$5$rounds=10$roundstoolow", "the minimum number is still observed",
676 "$5$rounds=1000$roundstoolow$yfvwcWrQ8l/K0DAWyuPMDNHpIVlTQebY9l/gL97"
677 "2bIC" },
678 };
679 #define ntests2 (sizeof (tests2) / sizeof (tests2[0]))
680
681
main(void)682 int main(void) {
683 struct sha256_ctx ctx;
684 char sum[32];
685 int result = 0;
686 int cnt, i;
687 char buf[1000];
688 static const char expected[32] =
689 "\xcd\xc7\x6e\x5c\x99\x14\xfb\x92\x81\xa1\xc7\xe2\x84\xd7\x3e\x67"
690 "\xf1\x80\x9a\x48\xa4\x97\x20\x0e\x04\x6d\x39\xcc\xc7\x11\x2c\xd0";
691
692 for (cnt = 0; cnt < (int) ntests; ++cnt) {
693 sha256_init_ctx(&ctx);
694 sha256_process_bytes(tests[cnt].input, strlen(tests[cnt].input), &ctx);
695 sha256_finish_ctx(&ctx, sum);
696 if (memcmp(tests[cnt].result, sum, 32) != 0) {
697 printf("test %d run %d failed\n", cnt, 1);
698 result = 1;
699 }
700
701 sha256_init_ctx(&ctx);
702 for (i = 0; tests[cnt].input[i] != '\0'; ++i) {
703 sha256_process_bytes(&tests[cnt].input[i], 1, &ctx);
704 }
705 sha256_finish_ctx(&ctx, sum);
706 if (memcmp(tests[cnt].result, sum, 32) != 0) {
707 printf("test %d run %d failed\n", cnt, 2);
708 result = 1;
709 }
710 }
711
712 /* Test vector from FIPS 180-2: appendix B.3. */
713
714 memset(buf, 'a', sizeof(buf));
715 sha256_init_ctx(&ctx);
716 for (i = 0; i < 1000; ++i) {
717 sha256_process_bytes (buf, sizeof (buf), &ctx);
718 }
719
720 sha256_finish_ctx(&ctx, sum);
721
722 if (memcmp(expected, sum, 32) != 0) {
723 printf("test %d failed\n", cnt);
724 result = 1;
725 }
726
727 for (cnt = 0; cnt < ntests2; ++cnt) {
728 char *cp = php_sha256_crypt(tests2[cnt].input, tests2[cnt].salt);
729 if (strcmp(cp, tests2[cnt].expected) != 0) {
730 printf("test %d: expected \"%s\", got \"%s\"\n", cnt, tests2[cnt].expected, cp);
731 result = 1;
732 }
733 }
734
735 if (result == 0)
736 puts("all tests OK");
737
738 return result;
739 }
740 #endif
741
