Annotation of embedaddon/php/ext/standard/crypt_sha256.c, revision 1.1
1.1 ! misho 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: # include "win32/php_stdint.h"
! 13: # define __alignof__ __alignof
! 14: # define alloca _alloca
! 15: #else
! 16: # if HAVE_INTTYPES_H
! 17: # include <inttypes.h>
! 18: # elif HAVE_STDINT_H
! 19: # include <stdint.h>
! 20: # endif
! 21: # ifndef HAVE_ALIGNOF
! 22: # include <stddef.h>
! 23: # define __alignof__(type) offsetof (struct { char c; type member;}, member)
! 24: # endif
! 25: # if HAVE_ATTRIBUTE_ALIGNED
! 26: # define ALIGNED(size) __attribute__ ((__aligned__ (size)))
! 27: # else
! 28: # define ALIGNED(size)
! 29: # endif
! 30: #endif
! 31:
! 32: #include <stdio.h>
! 33: #include <stdlib.h>
! 34:
! 35: #ifdef PHP_WIN32
! 36: # include <string.h>
! 37: #else
! 38: # include <sys/param.h>
! 39: # include <sys/types.h>
! 40: # if HAVE_STRING_H
! 41: # include <string.h>
! 42: # else
! 43: # include <strings.h>
! 44: # endif
! 45: #endif
! 46:
! 47: char * __php_stpncpy(char *dst, const char *src, size_t len)
! 48: {
! 49: size_t n = strlen(src);
! 50: if (n > len) {
! 51: n = len;
! 52: }
! 53: return strncpy(dst, src, len) + n;
! 54: }
! 55:
! 56: void * __php_mempcpy(void * dst, const void * src, size_t len)
! 57: {
! 58: return (((char *)memcpy(dst, src, len)) + len);
! 59: }
! 60:
! 61: #ifndef MIN
! 62: # define MIN(a, b) (((a) < (b)) ? (a) : (b))
! 63: #endif
! 64: #ifndef MAX
! 65: # define MAX(a, b) (((a) > (b)) ? (a) : (b))
! 66: #endif
! 67:
! 68: /* Structure to save state of computation between the single steps. */
! 69: struct sha256_ctx {
! 70: uint32_t H[8];
! 71:
! 72: uint32_t total[2];
! 73: uint32_t buflen;
! 74: char buffer[128]; /* NB: always correctly aligned for uint32_t. */
! 75: };
! 76:
! 77: #if PHP_WIN32 || (!defined(WORDS_BIGENDIAN))
! 78: # define SWAP(n) \
! 79: (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
! 80: #else
! 81: # define SWAP(n) (n)
! 82: #endif
! 83:
! 84: /* This array contains the bytes used to pad the buffer to the next
! 85: 64-byte boundary. (FIPS 180-2:5.1.1) */
! 86: static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
! 87:
! 88:
! 89: /* Constants for SHA256 from FIPS 180-2:4.2.2. */
! 90: static const uint32_t K[64] = {
! 91: 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
! 92: 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
! 93: 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
! 94: 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
! 95: 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
! 96: 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
! 97: 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
! 98: 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
! 99: 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
! 100: 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
! 101: 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
! 102: 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
! 103: 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
! 104: 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
! 105: 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
! 106: 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
! 107: };
! 108:
! 109:
! 110: /* Process LEN bytes of BUFFER, accumulating context into CTX.
! 111: It is assumed that LEN % 64 == 0. */
! 112: static void sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx) {
! 113: const uint32_t *words = buffer;
! 114: size_t nwords = len / sizeof (uint32_t);
! 115: unsigned int t;
! 116:
! 117: uint32_t a = ctx->H[0];
! 118: uint32_t b = ctx->H[1];
! 119: uint32_t c = ctx->H[2];
! 120: uint32_t d = ctx->H[3];
! 121: uint32_t e = ctx->H[4];
! 122: uint32_t f = ctx->H[5];
! 123: uint32_t g = ctx->H[6];
! 124: uint32_t h = ctx->H[7];
! 125:
! 126: /* First increment the byte count. FIPS 180-2 specifies the possible
! 127: length of the file up to 2^64 bits. Here we only compute the
! 128: number of bytes. Do a double word increment. */
! 129: ctx->total[0] += len;
! 130: if (ctx->total[0] < len) {
! 131: ++ctx->total[1];
! 132: }
! 133:
! 134: /* Process all bytes in the buffer with 64 bytes in each round of
! 135: the loop. */
! 136: while (nwords > 0) {
! 137: uint32_t W[64];
! 138: uint32_t a_save = a;
! 139: uint32_t b_save = b;
! 140: uint32_t c_save = c;
! 141: uint32_t d_save = d;
! 142: uint32_t e_save = e;
! 143: uint32_t f_save = f;
! 144: uint32_t g_save = g;
! 145: uint32_t h_save = h;
! 146:
! 147: /* Operators defined in FIPS 180-2:4.1.2. */
! 148: #define Ch(x, y, z) ((x & y) ^ (~x & z))
! 149: #define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
! 150: #define S0(x) (CYCLIC (x, 2) ^ CYCLIC (x, 13) ^ CYCLIC (x, 22))
! 151: #define S1(x) (CYCLIC (x, 6) ^ CYCLIC (x, 11) ^ CYCLIC (x, 25))
! 152: #define R0(x) (CYCLIC (x, 7) ^ CYCLIC (x, 18) ^ (x >> 3))
! 153: #define R1(x) (CYCLIC (x, 17) ^ CYCLIC (x, 19) ^ (x >> 10))
! 154:
! 155: /* It is unfortunate that C does not provide an operator for
! 156: cyclic rotation. Hope the C compiler is smart enough. */
! 157: #define CYCLIC(w, s) ((w >> s) | (w << (32 - s)))
! 158:
! 159: /* Compute the message schedule according to FIPS 180-2:6.2.2 step 2. */
! 160: for (t = 0; t < 16; ++t) {
! 161: W[t] = SWAP (*words);
! 162: ++words;
! 163: }
! 164: for (t = 16; t < 64; ++t)
! 165: W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
! 166:
! 167: /* The actual computation according to FIPS 180-2:6.2.2 step 3. */
! 168: for (t = 0; t < 64; ++t) {
! 169: uint32_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
! 170: uint32_t T2 = S0 (a) + Maj (a, b, c);
! 171: h = g;
! 172: g = f;
! 173: f = e;
! 174: e = d + T1;
! 175: d = c;
! 176: c = b;
! 177: b = a;
! 178: a = T1 + T2;
! 179: }
! 180:
! 181: /* Add the starting values of the context according to FIPS 180-2:6.2.2
! 182: step 4. */
! 183: a += a_save;
! 184: b += b_save;
! 185: c += c_save;
! 186: d += d_save;
! 187: e += e_save;
! 188: f += f_save;
! 189: g += g_save;
! 190: h += h_save;
! 191:
! 192: /* Prepare for the next round. */
! 193: nwords -= 16;
! 194: }
! 195:
! 196: /* Put checksum in context given as argument. */
! 197: ctx->H[0] = a;
! 198: ctx->H[1] = b;
! 199: ctx->H[2] = c;
! 200: ctx->H[3] = d;
! 201: ctx->H[4] = e;
! 202: ctx->H[5] = f;
! 203: ctx->H[6] = g;
! 204: ctx->H[7] = h;
! 205: }
! 206:
! 207:
! 208: /* Initialize structure containing state of computation.
! 209: (FIPS 180-2:5.3.2) */
! 210: static void sha256_init_ctx(struct sha256_ctx *ctx) {
! 211: ctx->H[0] = 0x6a09e667;
! 212: ctx->H[1] = 0xbb67ae85;
! 213: ctx->H[2] = 0x3c6ef372;
! 214: ctx->H[3] = 0xa54ff53a;
! 215: ctx->H[4] = 0x510e527f;
! 216: ctx->H[5] = 0x9b05688c;
! 217: ctx->H[6] = 0x1f83d9ab;
! 218: ctx->H[7] = 0x5be0cd19;
! 219:
! 220: ctx->total[0] = ctx->total[1] = 0;
! 221: ctx->buflen = 0;
! 222: }
! 223:
! 224:
! 225: /* Process the remaining bytes in the internal buffer and the usual
! 226: prolog according to the standard and write the result to RESBUF.
! 227:
! 228: IMPORTANT: On some systems it is required that RESBUF is correctly
! 229: aligned for a 32 bits value. */
! 230: static void * sha256_finish_ctx(struct sha256_ctx *ctx, void *resbuf) {
! 231: /* Take yet unprocessed bytes into account. */
! 232: uint32_t bytes = ctx->buflen;
! 233: size_t pad;
! 234: unsigned int i;
! 235:
! 236: /* Now count remaining bytes. */
! 237: ctx->total[0] += bytes;
! 238: if (ctx->total[0] < bytes) {
! 239: ++ctx->total[1];
! 240: }
! 241:
! 242: pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
! 243: memcpy(&ctx->buffer[bytes], fillbuf, pad);
! 244:
! 245: /* Put the 64-bit file length in *bits* at the end of the buffer. */
! 246: *(uint32_t *) &ctx->buffer[bytes + pad + 4] = SWAP (ctx->total[0] << 3);
! 247: *(uint32_t *) &ctx->buffer[bytes + pad] = SWAP ((ctx->total[1] << 3) |
! 248: (ctx->total[0] >> 29));
! 249:
! 250: /* Process last bytes. */
! 251: sha256_process_block(ctx->buffer, bytes + pad + 8, ctx);
! 252:
! 253: /* Put result from CTX in first 32 bytes following RESBUF. */
! 254: for (i = 0; i < 8; ++i) {
! 255: ((uint32_t *) resbuf)[i] = SWAP(ctx->H[i]);
! 256: }
! 257:
! 258: return resbuf;
! 259: }
! 260:
! 261:
! 262: static void sha256_process_bytes(const void *buffer, size_t len, struct sha256_ctx *ctx) {
! 263: /* When we already have some bits in our internal buffer concatenate
! 264: both inputs first. */
! 265: if (ctx->buflen != 0) {
! 266: size_t left_over = ctx->buflen;
! 267: size_t add = 128 - left_over > len ? len : 128 - left_over;
! 268:
! 269: memcpy(&ctx->buffer[left_over], buffer, add);
! 270: ctx->buflen += add;
! 271:
! 272: if (ctx->buflen > 64) {
! 273: sha256_process_block(ctx->buffer, ctx->buflen & ~63, ctx);
! 274: ctx->buflen &= 63;
! 275: /* The regions in the following copy operation cannot overlap. */
! 276: memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~63], ctx->buflen);
! 277: }
! 278:
! 279: buffer = (const char *) buffer + add;
! 280: len -= add;
! 281: }
! 282:
! 283: /* Process available complete blocks. */
! 284: if (len >= 64) {
! 285: /* To check alignment gcc has an appropriate operator. Other
! 286: compilers don't. */
! 287: #if __GNUC__ >= 2
! 288: # define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint32_t) != 0)
! 289: #else
! 290: # define UNALIGNED_P(p) (((uintptr_t) p) % sizeof (uint32_t) != 0)
! 291: #endif
! 292: if (UNALIGNED_P (buffer))
! 293: while (len > 64) {
! 294: sha256_process_block(memcpy(ctx->buffer, buffer, 64), 64, ctx);
! 295: buffer = (const char *) buffer + 64;
! 296: len -= 64;
! 297: } else {
! 298: sha256_process_block(buffer, len & ~63, ctx);
! 299: buffer = (const char *) buffer + (len & ~63);
! 300: len &= 63;
! 301: }
! 302: }
! 303:
! 304: /* Move remaining bytes into internal buffer. */
! 305: if (len > 0) {
! 306: size_t left_over = ctx->buflen;
! 307:
! 308: memcpy(&ctx->buffer[left_over], buffer, len);
! 309: left_over += len;
! 310: if (left_over >= 64) {
! 311: sha256_process_block(ctx->buffer, 64, ctx);
! 312: left_over -= 64;
! 313: memcpy(ctx->buffer, &ctx->buffer[64], left_over);
! 314: }
! 315: ctx->buflen = left_over;
! 316: }
! 317: }
! 318:
! 319:
! 320: /* Define our magic string to mark salt for SHA256 "encryption"
! 321: replacement. */
! 322: static const char sha256_salt_prefix[] = "$5$";
! 323:
! 324: /* Prefix for optional rounds specification. */
! 325: static const char sha256_rounds_prefix[] = "rounds=";
! 326:
! 327: /* Maximum salt string length. */
! 328: #define SALT_LEN_MAX 16
! 329: /* Default number of rounds if not explicitly specified. */
! 330: #define ROUNDS_DEFAULT 5000
! 331: /* Minimum number of rounds. */
! 332: #define ROUNDS_MIN 1000
! 333: /* Maximum number of rounds. */
! 334: #define ROUNDS_MAX 999999999
! 335:
! 336: /* Table with characters for base64 transformation. */
! 337: static const char b64t[64] =
! 338: "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
! 339:
! 340: char * php_sha256_crypt_r(const char *key, const char *salt, char *buffer, int buflen)
! 341: {
! 342: #ifdef PHP_WIN32
! 343: # if _MSC <= 1300
! 344: # pragma pack(push, 16)
! 345: unsigned char alt_result[32];
! 346: unsigned char temp_result[32];
! 347: # pragma pack(pop)
! 348: # else
! 349: __declspec(align(32)) unsigned char alt_result[32];
! 350: __declspec(align(32)) unsigned char temp_result[32];
! 351: # endif
! 352: #else
! 353: unsigned char alt_result[32] ALIGNED(__alignof__ (uint32_t));
! 354: unsigned char temp_result[32] ALIGNED(__alignof__ (uint32_t));
! 355: #endif
! 356:
! 357: struct sha256_ctx ctx;
! 358: struct sha256_ctx alt_ctx;
! 359: size_t salt_len;
! 360: size_t key_len;
! 361: size_t cnt;
! 362: char *cp;
! 363: char *copied_key = NULL;
! 364: char *copied_salt = NULL;
! 365: char *p_bytes;
! 366: char *s_bytes;
! 367: /* Default number of rounds. */
! 368: size_t rounds = ROUNDS_DEFAULT;
! 369: zend_bool rounds_custom = 0;
! 370:
! 371: /* Find beginning of salt string. The prefix should normally always
! 372: be present. Just in case it is not. */
! 373: if (strncmp(sha256_salt_prefix, salt, sizeof(sha256_salt_prefix) - 1) == 0) {
! 374: /* Skip salt prefix. */
! 375: salt += sizeof(sha256_salt_prefix) - 1;
! 376: }
! 377:
! 378: if (strncmp(salt, sha256_rounds_prefix, sizeof(sha256_rounds_prefix) - 1) == 0) {
! 379: const char *num = salt + sizeof(sha256_rounds_prefix) - 1;
! 380: char *endp;
! 381: unsigned long int srounds = strtoul(num, &endp, 10);
! 382: if (*endp == '$') {
! 383: salt = endp + 1;
! 384: rounds = MAX(ROUNDS_MIN, MIN(srounds, ROUNDS_MAX));
! 385: rounds_custom = 1;
! 386: }
! 387: }
! 388:
! 389: salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
! 390: key_len = strlen(key);
! 391:
! 392: if ((key - (char *) 0) % __alignof__ (uint32_t) != 0) {
! 393: char *tmp = (char *) alloca(key_len + __alignof__(uint32_t));
! 394: key = copied_key = memcpy(tmp + __alignof__(uint32_t) - (tmp - (char *) 0) % __alignof__(uint32_t), key, key_len);
! 395: }
! 396:
! 397: if ((salt - (char *) 0) % __alignof__(uint32_t) != 0) {
! 398: char *tmp = (char *) alloca(salt_len + 1 + __alignof__(uint32_t));
! 399: salt = copied_salt =
! 400: memcpy(tmp + __alignof__(uint32_t) - (tmp - (char *) 0) % __alignof__ (uint32_t), salt, salt_len);
! 401: copied_salt[salt_len] = 0;
! 402: }
! 403:
! 404: /* Prepare for the real work. */
! 405: sha256_init_ctx(&ctx);
! 406:
! 407: /* Add the key string. */
! 408: sha256_process_bytes(key, key_len, &ctx);
! 409:
! 410: /* The last part is the salt string. This must be at most 16
! 411: characters and it ends at the first `$' character (for
! 412: compatibility with existing implementations). */
! 413: sha256_process_bytes(salt, salt_len, &ctx);
! 414:
! 415:
! 416: /* Compute alternate SHA256 sum with input KEY, SALT, and KEY. The
! 417: final result will be added to the first context. */
! 418: sha256_init_ctx(&alt_ctx);
! 419:
! 420: /* Add key. */
! 421: sha256_process_bytes(key, key_len, &alt_ctx);
! 422:
! 423: /* Add salt. */
! 424: sha256_process_bytes(salt, salt_len, &alt_ctx);
! 425:
! 426: /* Add key again. */
! 427: sha256_process_bytes(key, key_len, &alt_ctx);
! 428:
! 429: /* Now get result of this (32 bytes) and add it to the other
! 430: context. */
! 431: sha256_finish_ctx(&alt_ctx, alt_result);
! 432:
! 433: /* Add for any character in the key one byte of the alternate sum. */
! 434: for (cnt = key_len; cnt > 32; cnt -= 32) {
! 435: sha256_process_bytes(alt_result, 32, &ctx);
! 436: }
! 437: sha256_process_bytes(alt_result, cnt, &ctx);
! 438:
! 439: /* Take the binary representation of the length of the key and for every
! 440: 1 add the alternate sum, for every 0 the key. */
! 441: for (cnt = key_len; cnt > 0; cnt >>= 1) {
! 442: if ((cnt & 1) != 0) {
! 443: sha256_process_bytes(alt_result, 32, &ctx);
! 444: } else {
! 445: sha256_process_bytes(key, key_len, &ctx);
! 446: }
! 447: }
! 448:
! 449: /* Create intermediate result. */
! 450: sha256_finish_ctx(&ctx, alt_result);
! 451:
! 452: /* Start computation of P 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 < key_len; ++cnt) {
! 457: sha256_process_bytes(key, key_len, &alt_ctx);
! 458: }
! 459:
! 460: /* Finish the digest. */
! 461: sha256_finish_ctx(&alt_ctx, temp_result);
! 462:
! 463: /* Create byte sequence P. */
! 464: cp = p_bytes = alloca(key_len);
! 465: for (cnt = key_len; cnt >= 32; cnt -= 32) {
! 466: cp = __php_mempcpy((void *)cp, (const void *)temp_result, 32);
! 467: }
! 468: memcpy(cp, temp_result, cnt);
! 469:
! 470: /* Start computation of S byte sequence. */
! 471: sha256_init_ctx(&alt_ctx);
! 472:
! 473: /* For every character in the password add the entire password. */
! 474: for (cnt = 0; cnt < 16 + alt_result[0]; ++cnt) {
! 475: sha256_process_bytes(salt, salt_len, &alt_ctx);
! 476: }
! 477:
! 478: /* Finish the digest. */
! 479: sha256_finish_ctx(&alt_ctx, temp_result);
! 480:
! 481: /* Create byte sequence S. */
! 482: cp = s_bytes = alloca(salt_len);
! 483: for (cnt = salt_len; cnt >= 32; cnt -= 32) {
! 484: cp = __php_mempcpy(cp, temp_result, 32);
! 485: }
! 486: memcpy(cp, temp_result, cnt);
! 487:
! 488: /* Repeatedly run the collected hash value through SHA256 to burn
! 489: CPU cycles. */
! 490: for (cnt = 0; cnt < rounds; ++cnt) {
! 491: /* New context. */
! 492: sha256_init_ctx(&ctx);
! 493:
! 494: /* Add key or last result. */
! 495: if ((cnt & 1) != 0) {
! 496: sha256_process_bytes(p_bytes, key_len, &ctx);
! 497: } else {
! 498: sha256_process_bytes(alt_result, 32, &ctx);
! 499: }
! 500:
! 501: /* Add salt for numbers not divisible by 3. */
! 502: if (cnt % 3 != 0) {
! 503: sha256_process_bytes(s_bytes, salt_len, &ctx);
! 504: }
! 505:
! 506: /* Add key for numbers not divisible by 7. */
! 507: if (cnt % 7 != 0) {
! 508: sha256_process_bytes(p_bytes, key_len, &ctx);
! 509: }
! 510:
! 511: /* Add key or last result. */
! 512: if ((cnt & 1) != 0) {
! 513: sha256_process_bytes(alt_result, 32, &ctx);
! 514: } else {
! 515: sha256_process_bytes(p_bytes, key_len, &ctx);
! 516: }
! 517:
! 518: /* Create intermediate result. */
! 519: sha256_finish_ctx(&ctx, alt_result);
! 520: }
! 521:
! 522: /* Now we can construct the result string. It consists of three
! 523: parts. */
! 524: cp = __php_stpncpy(buffer, sha256_salt_prefix, MAX(0, buflen));
! 525: buflen -= sizeof(sha256_salt_prefix) - 1;
! 526:
! 527: if (rounds_custom) {
! 528: #ifdef PHP_WIN32
! 529: int n = _snprintf(cp, MAX(0, buflen), "%s%u$", sha256_rounds_prefix, rounds);
! 530: #else
! 531: int n = snprintf(cp, MAX(0, buflen), "%s%zu$", sha256_rounds_prefix, rounds);
! 532: #endif
! 533: cp += n;
! 534: buflen -= n;
! 535: }
! 536:
! 537: cp = __php_stpncpy(cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
! 538: buflen -= MIN((size_t) MAX (0, buflen), salt_len);
! 539:
! 540: if (buflen > 0) {
! 541: *cp++ = '$';
! 542: --buflen;
! 543: }
! 544:
! 545: #define b64_from_24bit(B2, B1, B0, N) \
! 546: do { \
! 547: unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0); \
! 548: int n = (N); \
! 549: while (n-- > 0 && buflen > 0) \
! 550: { \
! 551: *cp++ = b64t[w & 0x3f]; \
! 552: --buflen; \
! 553: w >>= 6; \
! 554: } \
! 555: } while (0)
! 556:
! 557: b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4);
! 558: b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4);
! 559: b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4);
! 560: b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4);
! 561: b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4);
! 562: b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4);
! 563: b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4);
! 564: b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4);
! 565: b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4);
! 566: b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4);
! 567: b64_from_24bit(0, alt_result[31], alt_result[30], 3);
! 568: if (buflen <= 0) {
! 569: errno = ERANGE;
! 570: buffer = NULL;
! 571: } else
! 572: *cp = '\0'; /* Terminate the string. */
! 573:
! 574: /* Clear the buffer for the intermediate result so that people
! 575: attaching to processes or reading core dumps cannot get any
! 576: information. We do it in this way to clear correct_words[]
! 577: inside the SHA256 implementation as well. */
! 578: sha256_init_ctx(&ctx);
! 579: sha256_finish_ctx(&ctx, alt_result);
! 580: memset(temp_result, '\0', sizeof(temp_result));
! 581: memset(p_bytes, '\0', key_len);
! 582: memset(s_bytes, '\0', salt_len);
! 583: memset(&ctx, '\0', sizeof(ctx));
! 584: memset(&alt_ctx, '\0', sizeof(alt_ctx));
! 585:
! 586: if (copied_key != NULL) {
! 587: memset(copied_key, '\0', key_len);
! 588:
! 589: }
! 590: if (copied_salt != NULL) {
! 591: memset(copied_salt, '\0', salt_len);
! 592: }
! 593:
! 594: return buffer;
! 595: }
! 596:
! 597:
! 598: /* This entry point is equivalent to the `crypt' function in Unix
! 599: libcs. */
! 600: char * php_sha256_crypt(const char *key, const char *salt)
! 601: {
! 602: /* We don't want to have an arbitrary limit in the size of the
! 603: password. We can compute an upper bound for the size of the
! 604: result in advance and so we can prepare the buffer we pass to
! 605: `sha256_crypt_r'. */
! 606: static char *buffer;
! 607: static int buflen;
! 608: int needed = (sizeof(sha256_salt_prefix) - 1
! 609: + sizeof(sha256_rounds_prefix) + 9 + 1
! 610: + strlen(salt) + 1 + 43 + 1);
! 611:
! 612: if (buflen < needed) {
! 613: char *new_buffer = (char *) realloc(buffer, needed);
! 614: if (new_buffer == NULL) {
! 615: return NULL;
! 616: }
! 617:
! 618: buffer = new_buffer;
! 619: buflen = needed;
! 620: }
! 621:
! 622: return php_sha256_crypt_r(key, salt, buffer, buflen);
! 623: }
! 624:
! 625:
! 626: #ifdef TEST
! 627: static const struct
! 628: {
! 629: const char *input;
! 630: const char result[32];
! 631: } tests[] =
! 632: {
! 633: /* Test vectors from FIPS 180-2: appendix B.1. */
! 634: { "abc",
! 635: "\xba\x78\x16\xbf\x8f\x01\xcf\xea\x41\x41\x40\xde\x5d\xae\x22\x23"
! 636: "\xb0\x03\x61\xa3\x96\x17\x7a\x9c\xb4\x10\xff\x61\xf2\x00\x15\xad" },
! 637: /* Test vectors from FIPS 180-2: appendix B.2. */
! 638: { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
! 639: "\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
! 640: "\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1" },
! 641: /* Test vectors from the NESSIE project. */
! 642: { "",
! 643: "\xe3\xb0\xc4\x42\x98\xfc\x1c\x14\x9a\xfb\xf4\xc8\x99\x6f\xb9\x24"
! 644: "\x27\xae\x41\xe4\x64\x9b\x93\x4c\xa4\x95\x99\x1b\x78\x52\xb8\x55" },
! 645: { "a",
! 646: "\xca\x97\x81\x12\xca\x1b\xbd\xca\xfa\xc2\x31\xb3\x9a\x23\xdc\x4d"
! 647: "\xa7\x86\xef\xf8\x14\x7c\x4e\x72\xb9\x80\x77\x85\xaf\xee\x48\xbb" },
! 648: { "message digest",
! 649: "\xf7\x84\x6f\x55\xcf\x23\xe1\x4e\xeb\xea\xb5\xb4\xe1\x55\x0c\xad"
! 650: "\x5b\x50\x9e\x33\x48\xfb\xc4\xef\xa3\xa1\x41\x3d\x39\x3c\xb6\x50" },
! 651: { "abcdefghijklmnopqrstuvwxyz",
! 652: "\x71\xc4\x80\xdf\x93\xd6\xae\x2f\x1e\xfa\xd1\x44\x7c\x66\xc9\x52"
! 653: "\x5e\x31\x62\x18\xcf\x51\xfc\x8d\x9e\xd8\x32\xf2\xda\xf1\x8b\x73" },
! 654: { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
! 655: "\x24\x8d\x6a\x61\xd2\x06\x38\xb8\xe5\xc0\x26\x93\x0c\x3e\x60\x39"
! 656: "\xa3\x3c\xe4\x59\x64\xff\x21\x67\xf6\xec\xed\xd4\x19\xdb\x06\xc1" },
! 657: { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
! 658: "\xdb\x4b\xfc\xbd\x4d\xa0\xcd\x85\xa6\x0c\x3c\x37\xd3\xfb\xd8\x80"
! 659: "\x5c\x77\xf1\x5f\xc6\xb1\xfd\xfe\x61\x4e\xe0\xa7\xc8\xfd\xb4\xc0" },
! 660: { "123456789012345678901234567890123456789012345678901234567890"
! 661: "12345678901234567890",
! 662: "\xf3\x71\xbc\x4a\x31\x1f\x2b\x00\x9e\xef\x95\x2d\xd8\x3c\xa8\x0e"
! 663: "\x2b\x60\x02\x6c\x8e\x93\x55\x92\xd0\xf9\xc3\x08\x45\x3c\x81\x3e" }
! 664: };
! 665: #define ntests (sizeof (tests) / sizeof (tests[0]))
! 666:
! 667:
! 668: static const struct
! 669: {
! 670: const char *salt;
! 671: const char *input;
! 672: const char *expected;
! 673: } tests2[] =
! 674: {
! 675: { "$5$saltstring", "Hello world!",
! 676: "$5$saltstring$5B8vYYiY.CVt1RlTTf8KbXBH3hsxY/GNooZaBBGWEc5" },
! 677: { "$5$rounds=10000$saltstringsaltstring", "Hello world!",
! 678: "$5$rounds=10000$saltstringsaltst$3xv.VbSHBb41AL9AvLeujZkZRBAwqFMz2."
! 679: "opqey6IcA" },
! 680: { "$5$rounds=5000$toolongsaltstring", "This is just a test",
! 681: "$5$rounds=5000$toolongsaltstrin$Un/5jzAHMgOGZ5.mWJpuVolil07guHPvOW8"
! 682: "mGRcvxa5" },
! 683: { "$5$rounds=1400$anotherlongsaltstring",
! 684: "a very much longer text to encrypt. This one even stretches over more"
! 685: "than one line.",
! 686: "$5$rounds=1400$anotherlongsalts$Rx.j8H.h8HjEDGomFU8bDkXm3XIUnzyxf12"
! 687: "oP84Bnq1" },
! 688: { "$5$rounds=77777$short",
! 689: "we have a short salt string but not a short password",
! 690: "$5$rounds=77777$short$JiO1O3ZpDAxGJeaDIuqCoEFysAe1mZNJRs3pw0KQRd/" },
! 691: { "$5$rounds=123456$asaltof16chars..", "a short string",
! 692: "$5$rounds=123456$asaltof16chars..$gP3VQ/6X7UUEW3HkBn2w1/Ptq2jxPyzV/"
! 693: "cZKmF/wJvD" },
! 694: { "$5$rounds=10$roundstoolow", "the minimum number is still observed",
! 695: "$5$rounds=1000$roundstoolow$yfvwcWrQ8l/K0DAWyuPMDNHpIVlTQebY9l/gL97"
! 696: "2bIC" },
! 697: };
! 698: #define ntests2 (sizeof (tests2) / sizeof (tests2[0]))
! 699:
! 700:
! 701: int main(void) {
! 702: struct sha256_ctx ctx;
! 703: char sum[32];
! 704: int result = 0;
! 705: int cnt, i;
! 706: char buf[1000];
! 707: static const char expected[32] =
! 708: "\xcd\xc7\x6e\x5c\x99\x14\xfb\x92\x81\xa1\xc7\xe2\x84\xd7\x3e\x67"
! 709: "\xf1\x80\x9a\x48\xa4\x97\x20\x0e\x04\x6d\x39\xcc\xc7\x11\x2c\xd0";
! 710:
! 711: for (cnt = 0; cnt < (int) ntests; ++cnt) {
! 712: sha256_init_ctx(&ctx);
! 713: sha256_process_bytes(tests[cnt].input, strlen(tests[cnt].input), &ctx);
! 714: sha256_finish_ctx(&ctx, sum);
! 715: if (memcmp(tests[cnt].result, sum, 32) != 0) {
! 716: printf("test %d run %d failed\n", cnt, 1);
! 717: result = 1;
! 718: }
! 719:
! 720: sha256_init_ctx(&ctx);
! 721: for (i = 0; tests[cnt].input[i] != '\0'; ++i) {
! 722: sha256_process_bytes(&tests[cnt].input[i], 1, &ctx);
! 723: }
! 724: sha256_finish_ctx(&ctx, sum);
! 725: if (memcmp(tests[cnt].result, sum, 32) != 0) {
! 726: printf("test %d run %d failed\n", cnt, 2);
! 727: result = 1;
! 728: }
! 729: }
! 730:
! 731: /* Test vector from FIPS 180-2: appendix B.3. */
! 732:
! 733: memset(buf, 'a', sizeof(buf));
! 734: sha256_init_ctx(&ctx);
! 735: for (i = 0; i < 1000; ++i) {
! 736: sha256_process_bytes (buf, sizeof (buf), &ctx);
! 737: }
! 738:
! 739: sha256_finish_ctx(&ctx, sum);
! 740:
! 741: if (memcmp(expected, sum, 32) != 0) {
! 742: printf("test %d failed\n", cnt);
! 743: result = 1;
! 744: }
! 745:
! 746: for (cnt = 0; cnt < ntests2; ++cnt) {
! 747: char *cp = php_sha256_crypt(tests2[cnt].input, tests2[cnt].salt);
! 748: if (strcmp(cp, tests2[cnt].expected) != 0) {
! 749: printf("test %d: expected \"%s\", got \"%s\"\n", cnt, tests2[cnt].expected, cp);
! 750: result = 1;
! 751: }
! 752: }
! 753:
! 754: if (result == 0)
! 755: puts("all tests OK");
! 756:
! 757: return result;
! 758: }
! 759: #endif
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