PHP  
 PHP: Test and Code Coverage Analysis
downloads | QA | documentation | faq | getting help | mailing lists | reporting bugs | php.net sites | links | my php.net 
 

LCOV - code coverage report
Current view: top level - ext/standard - crypt_sha256.c (source / functions) Hit Total Coverage
Test: PHP Code Coverage Lines: 212 236 89.8 %
Date: 2014-04-19 Functions: 7 8 87.5 %
Legend: Lines: hit not hit

          Line data    Source code
       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          42 : char * __php_stpncpy(char *dst, const char *src, size_t len)
      48             : {
      49          42 :         size_t n = strlen(src);
      50          42 :         if (n > len) {
      51           3 :                 n = len;
      52             :         }
      53          42 :         return strncpy(dst, src, len) + n;
      54             : }
      55             : 
      56           5 : void * __php_mempcpy(void * dst, const void * src, size_t len)
      57             : {
      58           5 :         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      492533 : static void sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx) {
     113      492533 :         const uint32_t *words = buffer;
     114      492533 :         size_t nwords = len / sizeof (uint32_t);
     115             :         unsigned int t;
     116             : 
     117      492533 :         uint32_t a = ctx->H[0];
     118      492533 :         uint32_t b = ctx->H[1];
     119      492533 :         uint32_t c = ctx->H[2];
     120      492533 :         uint32_t d = ctx->H[3];
     121      492533 :         uint32_t e = ctx->H[4];
     122      492533 :         uint32_t f = ctx->H[5];
     123      492533 :         uint32_t g = ctx->H[6];
     124      492533 :         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      492533 :         ctx->total[0] += len;
     130      492533 :         if (ctx->total[0] < len) {
     131           0 :                 ++ctx->total[1];
     132             :         }
     133             : 
     134             :         /* Process all bytes in the buffer with 64 bytes in each round of
     135             :          the loop.  */
     136     1534376 :         while (nwords > 0) {
     137             :                 uint32_t W[64];
     138      549310 :                 uint32_t a_save = a;
     139      549310 :                 uint32_t b_save = b;
     140      549310 :                 uint32_t c_save = c;
     141      549310 :                 uint32_t d_save = d;
     142      549310 :                 uint32_t e_save = e;
     143      549310 :                 uint32_t f_save = f;
     144      549310 :                 uint32_t g_save = g;
     145      549310 :                 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     9338270 :                 for (t = 0; t < 16; ++t) {
     161     8788960 :                         W[t] = SWAP (*words);
     162     8788960 :                         ++words;
     163             :                 }
     164    26916190 :                 for (t = 16; t < 64; ++t)
     165    26366880 :                         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    35705150 :                 for (t = 0; t < 64; ++t) {
     169    35155840 :                         uint32_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
     170    35155840 :                         uint32_t T2 = S0 (a) + Maj (a, b, c);
     171    35155840 :                         h = g;
     172    35155840 :                         g = f;
     173    35155840 :                         f = e;
     174    35155840 :                         e = d + T1;
     175    35155840 :                         d = c;
     176    35155840 :                         c = b;
     177    35155840 :                         b = a;
     178    35155840 :                         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      549310 :                 a += a_save;
     184      549310 :                 b += b_save;
     185      549310 :                 c += c_save;
     186      549310 :                 d += d_save;
     187      549310 :                 e += e_save;
     188      549310 :                 f += f_save;
     189      549310 :                 g += g_save;
     190      549310 :                 h += h_save;
     191             : 
     192             :                 /* Prepare for the next round.  */
     193      549310 :                 nwords -= 16;
     194             :         }
     195             : 
     196             :         /* Put checksum in context given as argument.  */
     197      492533 :         ctx->H[0] = a;
     198      492533 :         ctx->H[1] = b;
     199      492533 :         ctx->H[2] = c;
     200      492533 :         ctx->H[3] = d;
     201      492533 :         ctx->H[4] = e;
     202      492533 :         ctx->H[5] = f;
     203      492533 :         ctx->H[6] = g;
     204      492533 :         ctx->H[7] = h;
     205      492533 : }
     206             : 
     207             : 
     208             : /* Initialize structure containing state of computation.
     209             :    (FIPS 180-2:5.3.2)  */
     210      253693 : static void sha256_init_ctx(struct sha256_ctx *ctx) {
     211      253693 :         ctx->H[0] = 0x6a09e667;
     212      253693 :         ctx->H[1] = 0xbb67ae85;
     213      253693 :         ctx->H[2] = 0x3c6ef372;
     214      253693 :         ctx->H[3] = 0xa54ff53a;
     215      253693 :         ctx->H[4] = 0x510e527f;
     216      253693 :         ctx->H[5] = 0x9b05688c;
     217      253693 :         ctx->H[6] = 0x1f83d9ab;
     218      253693 :         ctx->H[7] = 0x5be0cd19;
     219             : 
     220      253693 :         ctx->total[0] = ctx->total[1] = 0;
     221      253693 :         ctx->buflen = 0;
     222      253693 : }
     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      253693 : static void * sha256_finish_ctx(struct sha256_ctx *ctx, void *resbuf) {
     231             :         /* Take yet unprocessed bytes into account.  */
     232      253693 :         uint32_t bytes = ctx->buflen;
     233             :         size_t pad;
     234             :         unsigned int i;
     235             : 
     236             :         /* Now count remaining bytes.  */
     237      253693 :         ctx->total[0] += bytes;
     238      253693 :         if (ctx->total[0] < bytes) {
     239           0 :                 ++ctx->total[1];
     240             :         }
     241             : 
     242      253693 :         pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes;
     243      253693 :         memcpy(&ctx->buffer[bytes], fillbuf, pad);
     244             : 
     245             :         /* Put the 64-bit file length in *bits* at the end of the buffer.  */
     246      253693 :         *(uint32_t *) &ctx->buffer[bytes + pad + 4] = SWAP (ctx->total[0] << 3);
     247      253693 :         *(uint32_t *) &ctx->buffer[bytes + pad] = SWAP ((ctx->total[1] << 3) |
     248             :                                                   (ctx->total[0] >> 29));
     249             : 
     250             :         /* Process last bytes.  */
     251      253693 :         sha256_process_block(ctx->buffer, bytes + pad + 8, ctx);
     252             : 
     253             :         /* Put result from CTX in first 32 bytes following RESBUF.  */
     254     2283237 :         for (i = 0; i < 8; ++i) {
     255     2029544 :                 ((uint32_t *) resbuf)[i] = SWAP(ctx->H[i]);
     256             :         }
     257             : 
     258      253693 :         return resbuf;
     259             : }
     260             : 
     261             : 
     262      895904 : 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      895904 :         if (ctx->buflen != 0) {
     266      642053 :                 size_t left_over = ctx->buflen;
     267      642053 :                 size_t add = 128 - left_over > len ? len : 128 - left_over;
     268             : 
     269      642053 :                   memcpy(&ctx->buffer[left_over], buffer, add);
     270      642053 :                   ctx->buflen += add;
     271             : 
     272      642053 :                 if (ctx->buflen > 64) {
     273      238132 :                         sha256_process_block(ctx->buffer, ctx->buflen & ~63, ctx);
     274      238132 :                         ctx->buflen &= 63;
     275             :                         /* The regions in the following copy operation cannot overlap.  */
     276      238132 :                         memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~63], ctx->buflen);
     277             :                 }
     278             : 
     279      642053 :                 buffer = (const char *) buffer + add;
     280      642053 :                 len -= add;
     281             :         }
     282             : 
     283             :         /* Process available complete blocks.  */
     284      895904 :         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         708 :                 if (UNALIGNED_P (buffer))
     293           0 :                         while (len > 64) {
     294           0 :                                 sha256_process_block(memcpy(ctx->buffer, buffer, 64), 64, ctx);
     295           0 :                                 buffer = (const char *) buffer + 64;
     296           0 :                                 len -= 64;
     297             :                         } else {
     298         708 :                                 sha256_process_block(buffer, len & ~63, ctx);
     299         708 :                                 buffer = (const char *) buffer + (len & ~63);
     300         708 :                                 len &= 63;
     301             :                         }
     302             :         }
     303             : 
     304             :         /* Move remaining bytes into internal buffer.  */
     305      895904 :         if (len > 0) {
     306      254375 :                 size_t left_over = ctx->buflen;
     307             : 
     308      254375 :                 memcpy(&ctx->buffer[left_over], buffer, len);
     309      254375 :                 left_over += len;
     310      254375 :                 if (left_over >= 64) {
     311           0 :                         sha256_process_block(ctx->buffer, 64, ctx);
     312           0 :                         left_over -= 64;
     313           0 :                         memcpy(ctx->buffer, &ctx->buffer[64], left_over);
     314             :                 }
     315      254375 :                 ctx->buflen = left_over;
     316             :         }
     317      895904 : }
     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          12 : 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          12 :         char *copied_key = NULL;
     364          12 :         char *copied_salt = NULL;
     365             :         char *p_bytes;
     366             :         char *s_bytes;
     367             :         /* Default number of rounds.  */
     368          12 :         size_t rounds = ROUNDS_DEFAULT;
     369          12 :         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          12 :         if (strncmp(sha256_salt_prefix, salt, sizeof(sha256_salt_prefix) - 1) == 0) {
     374             :                 /* Skip salt prefix.  */
     375          12 :                 salt += sizeof(sha256_salt_prefix) - 1;
     376             :         }
     377             : 
     378          12 :         if (strncmp(salt, sha256_rounds_prefix, sizeof(sha256_rounds_prefix) - 1) == 0) {
     379           7 :                 const char *num = salt + sizeof(sha256_rounds_prefix) - 1;
     380             :                 char *endp;
     381           7 :                 unsigned long int srounds = strtoul(num, &endp, 10);
     382           7 :                 if (*endp == '$') {
     383           7 :                         salt = endp + 1;
     384           7 :                         rounds = MAX(ROUNDS_MIN, MIN(srounds, ROUNDS_MAX));
     385           7 :                         rounds_custom = 1;
     386             :                 }
     387             :         }
     388             : 
     389          12 :         salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
     390          12 :         key_len = strlen(key);
     391             : 
     392          12 :         if ((key - (char *) 0) % __alignof__ (uint32_t) != 0) {
     393           0 :                 char *tmp = (char *) alloca(key_len + __alignof__(uint32_t));
     394           0 :                 key = copied_key = memcpy(tmp + __alignof__(uint32_t) - (tmp - (char *) 0) % __alignof__(uint32_t), key, key_len);
     395             :         }
     396             : 
     397          12 :         if ((salt - (char *) 0) % __alignof__(uint32_t) != 0) {
     398           9 :                 char *tmp = (char *) alloca(salt_len + 1 + __alignof__(uint32_t));
     399           9 :                 salt = copied_salt =
     400           9 :                 memcpy(tmp + __alignof__(uint32_t) - (tmp - (char *) 0) % __alignof__ (uint32_t), salt, salt_len);
     401           9 :                 copied_salt[salt_len] = 0;
     402             :         }
     403             : 
     404             :         /* Prepare for the real work.  */
     405          12 :         sha256_init_ctx(&ctx);
     406             : 
     407             :         /* Add the key string.  */
     408          12 :         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          12 :         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          12 :         sha256_init_ctx(&alt_ctx);
     419             : 
     420             :         /* Add key.  */
     421          12 :         sha256_process_bytes(key, key_len, &alt_ctx);
     422             : 
     423             :         /* Add salt.  */
     424          12 :         sha256_process_bytes(salt, salt_len, &alt_ctx);
     425             : 
     426             :         /* Add key again.  */
     427          12 :         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          12 :         sha256_finish_ctx(&alt_ctx, alt_result);
     432             : 
     433             :         /* Add for any character in the key one byte of the alternate sum.  */
     434          16 :         for (cnt = key_len; cnt > 32; cnt -= 32) {
     435           4 :                 sha256_process_bytes(alt_result, 32, &ctx);
     436             :         }
     437          12 :         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          57 :         for (cnt = key_len; cnt > 0; cnt >>= 1) {
     442          45 :                 if ((cnt & 1) != 0) {
     443          25 :                         sha256_process_bytes(alt_result, 32, &ctx);
     444             :                 } else {
     445          20 :                         sha256_process_bytes(key, key_len, &ctx);
     446             :                 }
     447             :         }
     448             : 
     449             :         /* Create intermediate result.  */
     450          12 :         sha256_finish_ctx(&ctx, alt_result);
     451             : 
     452             :         /* Start computation of P byte sequence.  */
     453          12 :         sha256_init_ctx(&alt_ctx);
     454             : 
     455             :         /* For every character in the password add the entire password.  */
     456         259 :         for (cnt = 0; cnt < key_len; ++cnt) {
     457         247 :                 sha256_process_bytes(key, key_len, &alt_ctx);
     458             :         }
     459             : 
     460             :         /* Finish the digest.  */
     461          12 :         sha256_finish_ctx(&alt_ctx, temp_result);
     462             : 
     463             :         /* Create byte sequence P.  */
     464          12 :         cp = p_bytes = alloca(key_len);
     465          16 :         for (cnt = key_len; cnt >= 32; cnt -= 32) {
     466           4 :                 cp = __php_mempcpy((void *)cp, (const void *)temp_result, 32);
     467             :         }
     468          12 :         memcpy(cp, temp_result, cnt);
     469             : 
     470             :         /* Start computation of S byte sequence.  */
     471          12 :         sha256_init_ctx(&alt_ctx);
     472             : 
     473             :         /* For every character in the password add the entire password.  */
     474        1804 :         for (cnt = 0; cnt < (size_t) (16 + alt_result[0]); ++cnt) {
     475        1792 :                 sha256_process_bytes(salt, salt_len, &alt_ctx);
     476             :         }
     477             : 
     478             :         /* Finish the digest.  */
     479          12 :         sha256_finish_ctx(&alt_ctx, temp_result);
     480             : 
     481             :         /* Create byte sequence S.  */
     482          12 :         cp = s_bytes = alloca(salt_len);
     483          12 :         for (cnt = salt_len; cnt >= 32; cnt -= 32) {
     484           0 :                 cp = __php_mempcpy(cp, temp_result, 32);
     485             :         }
     486          12 :         memcpy(cp, temp_result, cnt);
     487             : 
     488             :         /* Repeatedly run the collected hash value through SHA256 to burn
     489             :         CPU cycles.  */
     490      253645 :         for (cnt = 0; cnt < rounds; ++cnt) {
     491             :                 /* New context.  */
     492      253633 :                 sha256_init_ctx(&ctx);
     493             : 
     494             :                 /* Add key or last result.  */
     495      253633 :                 if ((cnt & 1) != 0) {
     496      126816 :                         sha256_process_bytes(p_bytes, key_len, &ctx);
     497             :                 } else {
     498      126817 :                         sha256_process_bytes(alt_result, 32, &ctx);
     499             :                 }
     500             : 
     501             :                 /* Add salt for numbers not divisible by 3.  */
     502      253633 :                 if (cnt % 3 != 0) {
     503      169084 :                         sha256_process_bytes(s_bytes, salt_len, &ctx);
     504             :                 }
     505             : 
     506             :                 /* Add key for numbers not divisible by 7.  */
     507      253633 :                 if (cnt % 7 != 0) {
     508      217394 :                         sha256_process_bytes(p_bytes, key_len, &ctx);
     509             :                 }
     510             : 
     511             :                 /* Add key or last result.  */
     512      253633 :                 if ((cnt & 1) != 0) {
     513      126816 :                         sha256_process_bytes(alt_result, 32, &ctx);
     514             :                 } else {
     515      126817 :                         sha256_process_bytes(p_bytes, key_len, &ctx);
     516             :                 }
     517             : 
     518             :                 /* Create intermediate result.  */
     519      253633 :                 sha256_finish_ctx(&ctx, alt_result);
     520             :         }
     521             : 
     522             :         /* Now we can construct the result string.  It consists of three
     523             :         parts.  */
     524          12 :         cp = __php_stpncpy(buffer, sha256_salt_prefix, MAX(0, buflen));
     525          12 :         buflen -= sizeof(sha256_salt_prefix) - 1;
     526             : 
     527          12 :         if (rounds_custom) {
     528             : #ifdef PHP_WIN32
     529             :                 int n = _snprintf(cp, MAX(0, buflen), "%s%u$", sha256_rounds_prefix, rounds);
     530             : #else
     531           7 :                 int n = snprintf(cp, MAX(0, buflen), "%s%zu$", sha256_rounds_prefix, rounds);
     532             : #endif
     533           7 :                 cp += n;
     534           7 :                 buflen -= n;
     535             :         }
     536             : 
     537          12 :         cp = __php_stpncpy(cp, salt, MIN ((size_t) MAX (0, buflen), salt_len));
     538          12 :         buflen -= MIN((size_t) MAX (0, buflen), salt_len);
     539             : 
     540          12 :         if (buflen > 0) {
     541          12 :                 *cp++ = '$';
     542          12 :                 --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          12 :         b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4);
     558          12 :         b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4);
     559          12 :         b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4);
     560          12 :         b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4);
     561          12 :         b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4);
     562          12 :         b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4);
     563          12 :         b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4);
     564          12 :         b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4);
     565          12 :         b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4);
     566          12 :         b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4);
     567          12 :         b64_from_24bit(0, alt_result[31], alt_result[30], 3);
     568          12 :         if (buflen <= 0) {
     569           0 :                 errno = ERANGE;
     570           0 :                 buffer = NULL;
     571             :         } else
     572          12 :                 *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          12 :         sha256_init_ctx(&ctx);
     579          12 :         sha256_finish_ctx(&ctx, alt_result);
     580          12 :         memset(temp_result, '\0', sizeof(temp_result));
     581          12 :         memset(p_bytes, '\0', key_len);
     582          12 :         memset(s_bytes, '\0', salt_len);
     583          12 :         memset(&ctx, '\0', sizeof(ctx));
     584          12 :         memset(&alt_ctx, '\0', sizeof(alt_ctx));
     585             : 
     586          12 :         if (copied_key != NULL) {
     587           0 :                 memset(copied_key, '\0', key_len);
     588             : 
     589             :         }
     590          12 :         if (copied_salt != NULL) {
     591           9 :                 memset(copied_salt, '\0', salt_len);
     592             :         }
     593             : 
     594          12 :         return buffer;
     595             : }
     596             : 
     597             : 
     598             : /* This entry point is equivalent to the `crypt' function in Unix
     599             :    libcs.  */
     600           0 : 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           0 :                         + strlen(salt) + 1 + 43 + 1);
     611             : 
     612           0 :         if (buflen < needed) {
     613           0 :                 char *new_buffer = (char *) realloc(buffer, needed);
     614           0 :                 if (new_buffer == NULL) {
     615           0 :                         return NULL;
     616             :                 }
     617             : 
     618           0 :                 buffer = new_buffer;
     619           0 :                 buflen = needed;
     620             :         }
     621             : 
     622           0 :         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

Generated by: LCOV version 1.10

Generated at Sun, 20 Apr 2014 03:52:18 +0000 (4 days ago)

Copyright © 2005-2014 The PHP Group
All rights reserved.