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LCOV - code coverage report
Current view: top level - ext/standard - crypt_sha512.c (source / functions) Hit Total Coverage
Test: PHP Code Coverage Lines: 211 241 87.6 %
Date: 2014-07-21 Functions: 5 6 83.3 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* SHA512-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             : #ifdef PHP_WIN32
      11             : # define __alignof__ __alignof
      12             : # define alloca _alloca
      13             : #else
      14             : # ifndef HAVE_ALIGNOF
      15             : #  include <stddef.h>
      16             : #  define __alignof__(type) offsetof (struct { char c; type member;}, member)
      17             : # endif
      18             : # if HAVE_ATTRIBUTE_ALIGNED
      19             : #  define ALIGNED(size) __attribute__ ((__aligned__ (size)))
      20             : # else
      21             : #  define ALIGNED(size)
      22             : # endif
      23             : #endif
      24             : 
      25             : #include <stdio.h>
      26             : #include <stdlib.h>
      27             : 
      28             : #ifdef PHP_WIN32
      29             : # include <string.h>
      30             : #else
      31             : # include <sys/param.h>
      32             : # include <sys/types.h>
      33             : # if HAVE_STRING_H
      34             : #  include <string.h>
      35             : # else
      36             : #  include <strings.h>
      37             : # endif
      38             : #endif
      39             : 
      40             : extern void * __php_mempcpy(void * dst, const void * src, size_t len);
      41             : extern char * __php_stpncpy(char *dst, const char *src, size_t len);
      42             : 
      43             : #ifndef MIN
      44             : # define MIN(a, b) (((a) < (b)) ? (a) : (b))
      45             : #endif
      46             : #ifndef MAX
      47             : # define MAX(a, b) (((a) > (b)) ? (a) : (b))
      48             : #endif
      49             : 
      50             : /* See #51582 */
      51             : #ifndef UINT64_C
      52             : # define UINT64_C(value) __CONCAT(value, ULL)
      53             : #endif
      54             : 
      55             : /* Structure to save state of computation between the single steps.  */
      56             : struct sha512_ctx
      57             : {
      58             :         uint64_t H[8];
      59             : 
      60             :         uint64_t total[2];
      61             :         uint64_t buflen;
      62             :         char buffer[256];       /* NB: always correctly aligned for uint64_t.  */
      63             : };
      64             : 
      65             : 
      66             : #if PHP_WIN32 || (!defined(WORDS_BIGENDIAN))
      67             : # define SWAP(n) \
      68             :   (((n) << 56)                                    \
      69             :    | (((n) & 0xff00) << 40)                   \
      70             :    | (((n) & 0xff0000) << 24)                 \
      71             :    | (((n) & 0xff000000) << 8)                        \
      72             :    | (((n) >> 8) & 0xff000000)                        \
      73             :    | (((n) >> 24) & 0xff0000)                 \
      74             :    | (((n) >> 40) & 0xff00)                   \
      75             :    | ((n) >> 56))
      76             : #else
      77             : # define SWAP(n) (n)
      78             : #endif
      79             : 
      80             : /* This array contains the bytes used to pad the buffer to the next
      81             :    64-byte boundary.  (FIPS 180-2:5.1.2)  */
      82             : static const unsigned char fillbuf[128] = { 0x80, 0 /* , 0, 0, ...  */ };
      83             : 
      84             : /* Constants for SHA512 from FIPS 180-2:4.2.3.  */
      85             : static const uint64_t K[80] = {
      86             :         UINT64_C (0x428a2f98d728ae22), UINT64_C (0x7137449123ef65cd),
      87             :         UINT64_C (0xb5c0fbcfec4d3b2f), UINT64_C (0xe9b5dba58189dbbc),
      88             :         UINT64_C (0x3956c25bf348b538), UINT64_C (0x59f111f1b605d019),
      89             :         UINT64_C (0x923f82a4af194f9b), UINT64_C (0xab1c5ed5da6d8118),
      90             :         UINT64_C (0xd807aa98a3030242), UINT64_C (0x12835b0145706fbe),
      91             :         UINT64_C (0x243185be4ee4b28c), UINT64_C (0x550c7dc3d5ffb4e2),
      92             :         UINT64_C (0x72be5d74f27b896f), UINT64_C (0x80deb1fe3b1696b1),
      93             :         UINT64_C (0x9bdc06a725c71235), UINT64_C (0xc19bf174cf692694),
      94             :         UINT64_C (0xe49b69c19ef14ad2), UINT64_C (0xefbe4786384f25e3),
      95             :         UINT64_C (0x0fc19dc68b8cd5b5), UINT64_C (0x240ca1cc77ac9c65),
      96             :         UINT64_C (0x2de92c6f592b0275), UINT64_C (0x4a7484aa6ea6e483),
      97             :         UINT64_C (0x5cb0a9dcbd41fbd4), UINT64_C (0x76f988da831153b5),
      98             :         UINT64_C (0x983e5152ee66dfab), UINT64_C (0xa831c66d2db43210),
      99             :         UINT64_C (0xb00327c898fb213f), UINT64_C (0xbf597fc7beef0ee4),
     100             :         UINT64_C (0xc6e00bf33da88fc2), UINT64_C (0xd5a79147930aa725),
     101             :         UINT64_C (0x06ca6351e003826f), UINT64_C (0x142929670a0e6e70),
     102             :         UINT64_C (0x27b70a8546d22ffc), UINT64_C (0x2e1b21385c26c926),
     103             :         UINT64_C (0x4d2c6dfc5ac42aed), UINT64_C (0x53380d139d95b3df),
     104             :         UINT64_C (0x650a73548baf63de), UINT64_C (0x766a0abb3c77b2a8),
     105             :         UINT64_C (0x81c2c92e47edaee6), UINT64_C (0x92722c851482353b),
     106             :         UINT64_C (0xa2bfe8a14cf10364), UINT64_C (0xa81a664bbc423001),
     107             :         UINT64_C (0xc24b8b70d0f89791), UINT64_C (0xc76c51a30654be30),
     108             :         UINT64_C (0xd192e819d6ef5218), UINT64_C (0xd69906245565a910),
     109             :         UINT64_C (0xf40e35855771202a), UINT64_C (0x106aa07032bbd1b8),
     110             :         UINT64_C (0x19a4c116b8d2d0c8), UINT64_C (0x1e376c085141ab53),
     111             :         UINT64_C (0x2748774cdf8eeb99), UINT64_C (0x34b0bcb5e19b48a8),
     112             :         UINT64_C (0x391c0cb3c5c95a63), UINT64_C (0x4ed8aa4ae3418acb),
     113             :         UINT64_C (0x5b9cca4f7763e373), UINT64_C (0x682e6ff3d6b2b8a3),
     114             :         UINT64_C (0x748f82ee5defb2fc), UINT64_C (0x78a5636f43172f60),
     115             :         UINT64_C (0x84c87814a1f0ab72), UINT64_C (0x8cc702081a6439ec),
     116             :         UINT64_C (0x90befffa23631e28), UINT64_C (0xa4506cebde82bde9),
     117             :         UINT64_C (0xbef9a3f7b2c67915), UINT64_C (0xc67178f2e372532b),
     118             :         UINT64_C (0xca273eceea26619c), UINT64_C (0xd186b8c721c0c207),
     119             :         UINT64_C (0xeada7dd6cde0eb1e), UINT64_C (0xf57d4f7fee6ed178),
     120             :         UINT64_C (0x06f067aa72176fba), UINT64_C (0x0a637dc5a2c898a6),
     121             :         UINT64_C (0x113f9804bef90dae), UINT64_C (0x1b710b35131c471b),
     122             :         UINT64_C (0x28db77f523047d84), UINT64_C (0x32caab7b40c72493),
     123             :         UINT64_C (0x3c9ebe0a15c9bebc), UINT64_C (0x431d67c49c100d4c),
     124             :         UINT64_C (0x4cc5d4becb3e42b6), UINT64_C (0x597f299cfc657e2a),
     125             :         UINT64_C (0x5fcb6fab3ad6faec), UINT64_C (0x6c44198c4a475817)
     126             :   };
     127             : 
     128             : 
     129             : /* Process LEN bytes of BUFFER, accumulating context into CTX.
     130             :    It is assumed that LEN % 128 == 0.  */
     131             : static void
     132      302810 : sha512_process_block(const void *buffer, size_t len, struct sha512_ctx *ctx) {
     133      302810 :         const uint64_t *words = buffer;
     134      302810 :         size_t nwords = len / sizeof(uint64_t);
     135      302810 :         uint64_t a = ctx->H[0];
     136      302810 :         uint64_t b = ctx->H[1];
     137      302810 :         uint64_t c = ctx->H[2];
     138      302810 :         uint64_t d = ctx->H[3];
     139      302810 :         uint64_t e = ctx->H[4];
     140      302810 :         uint64_t f = ctx->H[5];
     141      302810 :         uint64_t g = ctx->H[6];
     142      302810 :         uint64_t h = ctx->H[7];
     143             : 
     144             :   /* First increment the byte count.  FIPS 180-2 specifies the possible
     145             :          length of the file up to 2^128 bits.  Here we only compute the
     146             :          number of bytes.  Do a double word increment.  */
     147      302810 :         ctx->total[0] += len;
     148      302810 :         if (ctx->total[0] < len) {
     149           0 :                 ++ctx->total[1];
     150             :         }
     151             : 
     152             :         /* Process all bytes in the buffer with 128 bytes in each round of
     153             :          the loop.  */
     154      923294 :         while (nwords > 0) {
     155             :                 uint64_t W[80];
     156      317674 :                 uint64_t a_save = a;
     157      317674 :                 uint64_t b_save = b;
     158      317674 :                 uint64_t c_save = c;
     159      317674 :                 uint64_t d_save = d;
     160      317674 :                 uint64_t e_save = e;
     161      317674 :                 uint64_t f_save = f;
     162      317674 :                 uint64_t g_save = g;
     163      317674 :                 uint64_t h_save = h;
     164             :                 unsigned int t;
     165             : 
     166             : /* Operators defined in FIPS 180-2:4.1.2.  */
     167             : #define Ch(x, y, z) ((x & y) ^ (~x & z))
     168             : #define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
     169             : #define S0(x) (CYCLIC (x, 28) ^ CYCLIC (x, 34) ^ CYCLIC (x, 39))
     170             : #define S1(x) (CYCLIC (x, 14) ^ CYCLIC (x, 18) ^ CYCLIC (x, 41))
     171             : #define R0(x) (CYCLIC (x, 1) ^ CYCLIC (x, 8) ^ (x >> 7))
     172             : #define R1(x) (CYCLIC (x, 19) ^ CYCLIC (x, 61) ^ (x >> 6))
     173             : 
     174             :                 /* It is unfortunate that C does not provide an operator for
     175             :                    cyclic rotation.  Hope the C compiler is smart enough.  */
     176             : #define CYCLIC(w, s) ((w >> s) | (w << (64 - s)))
     177             : 
     178             :                 /* Compute the message schedule according to FIPS 180-2:6.3.2 step 2.  */
     179     5400458 :                 for (t = 0; t < 16; ++t) {
     180     5082784 :                         W[t] = SWAP (*words);
     181     5082784 :                         ++words;
     182             :                 }
     183             : 
     184    20648810 :                 for (t = 16; t < 80; ++t) {
     185    20331136 :                         W[t] = R1 (W[t - 2]) + W[t - 7] + R0 (W[t - 15]) + W[t - 16];
     186             :                 }
     187             : 
     188             :                 /* The actual computation according to FIPS 180-2:6.3.2 step 3.  */
     189    25731594 :                 for (t = 0; t < 80; ++t) {
     190    25413920 :                         uint64_t T1 = h + S1 (e) + Ch (e, f, g) + K[t] + W[t];
     191    25413920 :                         uint64_t T2 = S0 (a) + Maj (a, b, c);
     192    25413920 :                         h = g;
     193    25413920 :                         g = f;
     194    25413920 :                         f = e;
     195    25413920 :                         e = d + T1;
     196    25413920 :                         d = c;
     197    25413920 :                         c = b;
     198    25413920 :                         b = a;
     199    25413920 :                         a = T1 + T2;
     200             :                 }
     201             : 
     202             :                 /* Add the starting values of the context according to FIPS 180-2:6.3.2
     203             :                 step 4.  */
     204      317674 :                 a += a_save;
     205      317674 :                 b += b_save;
     206      317674 :                 c += c_save;
     207      317674 :                 d += d_save;
     208      317674 :                 e += e_save;
     209      317674 :                 f += f_save;
     210      317674 :                 g += g_save;
     211      317674 :                 h += h_save;
     212             : 
     213             :                 /* Prepare for the next round.  */
     214      317674 :                 nwords -= 16;
     215             :         }
     216             : 
     217             :         /* Put checksum in context given as argument.  */
     218      302810 :         ctx->H[0] = a;
     219      302810 :         ctx->H[1] = b;
     220      302810 :         ctx->H[2] = c;
     221      302810 :         ctx->H[3] = d;
     222      302810 :         ctx->H[4] = e;
     223      302810 :         ctx->H[5] = f;
     224      302810 :         ctx->H[6] = g;
     225      302810 :         ctx->H[7] = h;
     226      302810 : }
     227             : 
     228             : 
     229             : /* Initialize structure containing state of computation.
     230             :    (FIPS 180-2:5.3.3)  */
     231      233678 : static void sha512_init_ctx (struct sha512_ctx *ctx) {
     232      233678 :         ctx->H[0] = UINT64_C (0x6a09e667f3bcc908);
     233      233678 :         ctx->H[1] = UINT64_C (0xbb67ae8584caa73b);
     234      233678 :         ctx->H[2] = UINT64_C (0x3c6ef372fe94f82b);
     235      233678 :         ctx->H[3] = UINT64_C (0xa54ff53a5f1d36f1);
     236      233678 :         ctx->H[4] = UINT64_C (0x510e527fade682d1);
     237      233678 :         ctx->H[5] = UINT64_C (0x9b05688c2b3e6c1f);
     238      233678 :         ctx->H[6] = UINT64_C (0x1f83d9abfb41bd6b);
     239      233678 :         ctx->H[7] = UINT64_C (0x5be0cd19137e2179);
     240             : 
     241      233678 :         ctx->total[0] = ctx->total[1] = 0;
     242      233678 :         ctx->buflen = 0;
     243      233678 : }
     244             : 
     245             : 
     246             : /* Process the remaining bytes in the internal buffer and the usual
     247             :         prolog according to the standard and write the result to RESBUF.
     248             : 
     249             :         IMPORTANT: On some systems it is required that RESBUF is correctly
     250             :         aligned for a 32 bits value. */
     251      233678 : static void * sha512_finish_ctx (struct sha512_ctx *ctx, void *resbuf) {
     252             :         /* Take yet unprocessed bytes into account.  */
     253      233678 :         uint64_t bytes = ctx->buflen;
     254             :         size_t pad;
     255             :         unsigned int i;
     256             : 
     257             :         /* Now count remaining bytes.  */
     258      233678 :         ctx->total[0] += bytes;
     259      233678 :         if (ctx->total[0] < bytes) {
     260           0 :                 ++ctx->total[1];
     261             :         }
     262             : 
     263      233678 :         pad = bytes >= 112 ? 128 + 112 - (size_t)bytes : 112 - (size_t)bytes;
     264      233678 :         memcpy(&ctx->buffer[bytes], fillbuf, pad);
     265             : 
     266             :         /* Put the 128-bit file length in *bits* at the end of the buffer.  */
     267      233678 :         *(uint64_t *) &ctx->buffer[bytes + pad + 8] = SWAP(ctx->total[0] << 3);
     268      233678 :         *(uint64_t *) &ctx->buffer[bytes + pad] = SWAP((ctx->total[1] << 3) |
     269             :                                                 (ctx->total[0] >> 61));
     270             : 
     271             :         /* Process last bytes.  */
     272      233678 :         sha512_process_block(ctx->buffer, (size_t)(bytes + pad + 16), ctx);
     273             : 
     274             :         /* Put result from CTX in first 64 bytes following RESBUF.  */
     275     2103102 :         for (i = 0; i < 8; ++i) {
     276     1869424 :                 ((uint64_t *) resbuf)[i] = SWAP(ctx->H[i]);
     277             :         }
     278             : 
     279      233678 :         return resbuf;
     280             : }
     281             : 
     282             : static void
     283      824910 : sha512_process_bytes(const void *buffer, size_t len, struct sha512_ctx *ctx) {
     284             :         /* When we already have some bits in our internal buffer concatenate
     285             :          both inputs first.  */
     286      824910 :         if (ctx->buflen != 0) {
     287      590997 :                 size_t left_over = (size_t)ctx->buflen;
     288      590997 :                 size_t add = (size_t)(256 - left_over > len ? len : 256 - left_over);
     289             : 
     290      590997 :                 memcpy(&ctx->buffer[left_over], buffer, add);
     291      590997 :                 ctx->buflen += add;
     292             : 
     293      590997 :                 if (ctx->buflen > 128) {
     294       69132 :                         sha512_process_block(ctx->buffer, ctx->buflen & ~127, ctx);
     295             : 
     296       69132 :                         ctx->buflen &= 127;
     297             :                         /* The regions in the following copy operation cannot overlap.  */
     298       69132 :                         memcpy(ctx->buffer, &ctx->buffer[(left_over + add) & ~127],
     299             :                                         (size_t)ctx->buflen);
     300             :                 }
     301             : 
     302      590997 :                 buffer = (const char *) buffer + add;
     303      590997 :                 len -= add;
     304             :         }
     305             : 
     306             :         /* Process available complete blocks.  */
     307      824910 :         if (len >= 128) {
     308             : #if !_STRING_ARCH_unaligned
     309             : /* To check alignment gcc has an appropriate operator.  Other
     310             :    compilers don't.  */
     311             : # if __GNUC__ >= 2
     312             : #  define UNALIGNED_P(p) (((uintptr_t) p) % __alignof__ (uint64_t) != 0)
     313             : # else
     314             : #  define UNALIGNED_P(p) (((uintptr_t) p) % sizeof(uint64_t) != 0)
     315             : # endif
     316           0 :                 if (UNALIGNED_P(buffer))
     317           0 :                         while (len > 128) {
     318           0 :                                 sha512_process_block(memcpy(ctx->buffer, buffer, 128), 128, ctx);
     319           0 :                                 buffer = (const char *) buffer + 128;
     320           0 :                                 len -= 128;
     321             :                         }
     322             :                 else
     323             : #endif
     324             :                 {
     325           0 :                   sha512_process_block(buffer, len & ~127, ctx);
     326           0 :                   buffer = (const char *) buffer + (len & ~127);
     327           0 :                   len &= 127;
     328             :                 }
     329             :         }
     330             : 
     331             :   /* Move remaining bytes into internal buffer.  */
     332      824910 :         if (len > 0) {
     333      233667 :                 size_t left_over = (size_t)ctx->buflen;
     334             : 
     335      233667 :                 memcpy(&ctx->buffer[left_over], buffer, len);
     336      233667 :                 left_over += len;
     337      233667 :                 if (left_over >= 128) {
     338           0 :                         sha512_process_block(ctx->buffer, 128, ctx);
     339           0 :                         left_over -= 128;
     340           0 :                         memcpy(ctx->buffer, &ctx->buffer[128], left_over);
     341             :                 }
     342      233667 :                 ctx->buflen = left_over;
     343             :         }
     344      824910 : }
     345             : 
     346             : 
     347             : /* Define our magic string to mark salt for SHA512 "encryption"
     348             :    replacement.  */
     349             : static const char sha512_salt_prefix[] = "$6$";
     350             : 
     351             : /* Prefix for optional rounds specification.  */
     352             : static const char sha512_rounds_prefix[] = "rounds=";
     353             : 
     354             : /* Maximum salt string length.  */
     355             : #define SALT_LEN_MAX 16
     356             : /* Default number of rounds if not explicitly specified.  */
     357             : #define ROUNDS_DEFAULT 5000
     358             : /* Minimum number of rounds.  */
     359             : #define ROUNDS_MIN 1000
     360             : /* Maximum number of rounds.  */
     361             : #define ROUNDS_MAX 999999999
     362             : 
     363             : /* Table with characters for base64 transformation.  */
     364             : static const char b64t[64] =
     365             : "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
     366             : 
     367             : 
     368             : char *
     369           9 : php_sha512_crypt_r(const char *key, const char *salt, char *buffer, int buflen) {
     370             : #ifdef PHP_WIN32
     371             : # if _MSC <= 1300
     372             : #  pragma pack(push, 16)
     373             :         unsigned char alt_result[64];
     374             :         unsigned char temp_result[64];
     375             : #  pragma pack(pop)
     376             : # else
     377             :         __declspec(align(64)) unsigned char alt_result[64];
     378             :         __declspec(align(64)) unsigned char temp_result[64];
     379             : # endif
     380             : #else
     381             :         unsigned char alt_result[64] ALIGNED(__alignof__ (uint64_t));
     382             :         unsigned char temp_result[64] ALIGNED(__alignof__ (uint64_t));
     383             : #endif
     384             :         struct sha512_ctx ctx;
     385             :         struct sha512_ctx alt_ctx;
     386             :         size_t salt_len;
     387             :         size_t key_len;
     388             :         size_t cnt;
     389             :         char *cp;
     390           9 :         char *copied_key = NULL;
     391           9 :         char *copied_salt = NULL;
     392             :         char *p_bytes;
     393             :         char *s_bytes;
     394             :         /* Default number of rounds.  */
     395           9 :         size_t rounds = ROUNDS_DEFAULT;
     396           9 :         zend_bool rounds_custom = 0;
     397             : 
     398             :         /* Find beginning of salt string.  The prefix should normally always
     399             :          be present.  Just in case it is not.  */
     400           9 :         if (strncmp(sha512_salt_prefix, salt, sizeof(sha512_salt_prefix) - 1) == 0) {
     401             :                 /* Skip salt prefix.  */
     402           9 :                 salt += sizeof(sha512_salt_prefix) - 1;
     403             :         }
     404             : 
     405           9 :         if (strncmp(salt, sha512_rounds_prefix, sizeof(sha512_rounds_prefix) - 1) == 0) {
     406           6 :                 const char *num = salt + sizeof(sha512_rounds_prefix) - 1;
     407             :                 char *endp;
     408           6 :                 unsigned long int srounds = strtoul(num, &endp, 10);
     409             : 
     410           6 :                 if (*endp == '$') {
     411           6 :                         salt = endp + 1;
     412           6 :                         rounds = MAX(ROUNDS_MIN, MIN(srounds, ROUNDS_MAX));
     413           6 :                         rounds_custom = 1;
     414             :                 }
     415             :         }
     416             : 
     417           9 :         salt_len = MIN(strcspn(salt, "$"), SALT_LEN_MAX);
     418           9 :         key_len = strlen(key);
     419             : 
     420           9 :         if ((key - (char *) 0) % __alignof__ (uint64_t) != 0) {
     421           0 :                 char *tmp = (char *) alloca (key_len + __alignof__ (uint64_t));
     422           0 :                 key = copied_key =
     423           0 :                 memcpy(tmp + __alignof__(uint64_t) - (tmp - (char *) 0) % __alignof__(uint64_t), key, key_len);
     424             :         }
     425             : 
     426           9 :         if ((salt - (char *) 0) % __alignof__ (uint64_t) != 0) {
     427           7 :                 char *tmp = (char *) alloca(salt_len + 1 + __alignof__(uint64_t));
     428           7 :                 salt = copied_salt = memcpy(tmp + __alignof__(uint64_t) - (tmp - (char *) 0) % __alignof__(uint64_t), salt, salt_len);
     429           7 :                 copied_salt[salt_len] = 0;
     430             :         }
     431             : 
     432             :         /* Prepare for the real work.  */
     433           9 :         sha512_init_ctx(&ctx);
     434             : 
     435             :         /* Add the key string.  */
     436           9 :         sha512_process_bytes(key, key_len, &ctx);
     437             : 
     438             :         /* The last part is the salt string.  This must be at most 16
     439             :          characters and it ends at the first `$' character (for
     440             :          compatibility with existing implementations).  */
     441           9 :         sha512_process_bytes(salt, salt_len, &ctx);
     442             : 
     443             : 
     444             :         /* Compute alternate SHA512 sum with input KEY, SALT, and KEY.  The
     445             :          final result will be added to the first context.  */
     446           9 :         sha512_init_ctx(&alt_ctx);
     447             : 
     448             :         /* Add key.  */
     449           9 :         sha512_process_bytes(key, key_len, &alt_ctx);
     450             : 
     451             :         /* Add salt.  */
     452           9 :         sha512_process_bytes(salt, salt_len, &alt_ctx);
     453             : 
     454             :         /* Add key again.  */
     455           9 :         sha512_process_bytes(key, key_len, &alt_ctx);
     456             : 
     457             :         /* Now get result of this (64 bytes) and add it to the other
     458             :          context.  */
     459           9 :         sha512_finish_ctx(&alt_ctx, alt_result);
     460             : 
     461             :         /* Add for any character in the key one byte of the alternate sum.  */
     462          10 :         for (cnt = key_len; cnt > 64; cnt -= 64) {
     463           1 :                 sha512_process_bytes(alt_result, 64, &ctx);
     464             :         }
     465           9 :         sha512_process_bytes(alt_result, cnt, &ctx);
     466             : 
     467             :         /* Take the binary representation of the length of the key and for every
     468             :          1 add the alternate sum, for every 0 the key.  */
     469          49 :         for (cnt = key_len; cnt > 0; cnt >>= 1) {
     470          40 :                 if ((cnt & 1) != 0) {
     471          22 :                         sha512_process_bytes(alt_result, 64, &ctx);
     472             :                 } else {
     473          18 :                         sha512_process_bytes(key, key_len, &ctx);
     474             :                 }
     475             :         }
     476             : 
     477             :         /* Create intermediate result.  */
     478           9 :         sha512_finish_ctx(&ctx, alt_result);
     479             : 
     480             :         /* Start computation of P byte sequence.  */
     481           9 :         sha512_init_ctx(&alt_ctx);
     482             : 
     483             :         /* For every character in the password add the entire password.  */
     484         244 :         for (cnt = 0; cnt < key_len; ++cnt) {
     485         235 :                 sha512_process_bytes(key, key_len, &alt_ctx);
     486             :         }
     487             : 
     488             :         /* Finish the digest.  */
     489           9 :         sha512_finish_ctx(&alt_ctx, temp_result);
     490             : 
     491             :         /* Create byte sequence P.  */
     492           9 :         cp = p_bytes = alloca(key_len);
     493          10 :         for (cnt = key_len; cnt >= 64; cnt -= 64) {
     494           1 :                 cp = __php_mempcpy((void *) cp, (const void *)temp_result, 64);
     495             :         }
     496             : 
     497           9 :         memcpy(cp, temp_result, cnt);
     498             : 
     499             :         /* Start computation of S byte sequence.  */
     500           9 :         sha512_init_ctx(&alt_ctx);
     501             : 
     502             :         /* For every character in the password add the entire password.  */
     503        1318 :         for (cnt = 0; cnt < (size_t) (16 + alt_result[0]); ++cnt) {
     504        1309 :                 sha512_process_bytes(salt, salt_len, &alt_ctx);
     505             :         }
     506             : 
     507             :         /* Finish the digest.  */
     508           9 :         sha512_finish_ctx(&alt_ctx, temp_result);
     509             : 
     510             :         /* Create byte sequence S.  */
     511           9 :         cp = s_bytes = alloca(salt_len);
     512           9 :         for (cnt = salt_len; cnt >= 64; cnt -= 64) {
     513           0 :                 cp = __php_mempcpy(cp, temp_result, 64);
     514             :         }
     515           9 :         memcpy(cp, temp_result, cnt);
     516             : 
     517             :         /* Repeatedly run the collected hash value through SHA512 to burn
     518             :          CPU cycles.  */
     519      233642 :         for (cnt = 0; cnt < rounds; ++cnt) {
     520             :                 /* New context.  */
     521      233633 :                 sha512_init_ctx(&ctx);
     522             : 
     523             :                 /* Add key or last result.  */
     524      233633 :                 if ((cnt & 1) != 0) {
     525      116816 :                         sha512_process_bytes(p_bytes, key_len, &ctx);
     526             :                 } else {
     527      116817 :                         sha512_process_bytes(alt_result, 64, &ctx);
     528             :                 }
     529             : 
     530             :                 /* Add salt for numbers not divisible by 3.  */
     531      233633 :                 if (cnt % 3 != 0) {
     532      155752 :                         sha512_process_bytes(s_bytes, salt_len, &ctx);
     533             :                 }
     534             : 
     535             :                 /* Add key for numbers not divisible by 7.  */
     536      233633 :                 if (cnt % 7 != 0) {
     537      200253 :                         sha512_process_bytes(p_bytes, key_len, &ctx);
     538             :                 }
     539             : 
     540             :                 /* Add key or last result.  */
     541      233633 :                 if ((cnt & 1) != 0) {
     542      116816 :                         sha512_process_bytes(alt_result, 64, &ctx);
     543             :                 } else {
     544      116817 :                         sha512_process_bytes(p_bytes, key_len, &ctx);
     545             :                 }
     546             : 
     547             :                 /* Create intermediate result.  */
     548      233633 :                 sha512_finish_ctx(&ctx, alt_result);
     549             :         }
     550             : 
     551             :         /* Now we can construct the result string.  It consists of three
     552             :          parts.  */
     553           9 :         cp = __php_stpncpy(buffer, sha512_salt_prefix, MAX(0, buflen));
     554           9 :         buflen -= sizeof(sha512_salt_prefix) - 1;
     555             : 
     556           9 :         if (rounds_custom) {
     557             : #ifdef PHP_WIN32
     558             :           int n = _snprintf(cp, MAX(0, buflen), "%s%u$", sha512_rounds_prefix, rounds);
     559             : #else
     560           6 :           int n = snprintf(cp, MAX(0, buflen), "%s%zu$", sha512_rounds_prefix, rounds);
     561             : #endif
     562           6 :           cp += n;
     563           6 :           buflen -= n;
     564             :         }
     565             : 
     566           9 :         cp = __php_stpncpy(cp, salt, MIN((size_t) MAX(0, buflen), salt_len));
     567           9 :         buflen -= (int) MIN((size_t) MAX(0, buflen), salt_len);
     568             : 
     569           9 :         if (buflen > 0) {
     570           9 :                 *cp++ = '$';
     571           9 :                 --buflen;
     572             :         }
     573             : 
     574             : #define b64_from_24bit(B2, B1, B0, N)                    \
     575             :   do {                                                                                   \
     576             :         unsigned int w = ((B2) << 16) | ((B1) << 8) | (B0);  \
     577             :         int n = (N);                                                                 \
     578             :         while (n-- > 0 && buflen > 0)                                          \
     579             :           {                                                                                      \
     580             :         *cp++ = b64t[w & 0x3f];                                                      \
     581             :         --buflen;                                                                        \
     582             :         w >>= 6;                                                                   \
     583             :           }                                                                                      \
     584             :   } while (0)
     585             : 
     586           9 :         b64_from_24bit(alt_result[0], alt_result[21], alt_result[42], 4);
     587           9 :         b64_from_24bit(alt_result[22], alt_result[43], alt_result[1], 4);
     588           9 :         b64_from_24bit(alt_result[44], alt_result[2], alt_result[23], 4);
     589           9 :         b64_from_24bit(alt_result[3], alt_result[24], alt_result[45], 4);
     590           9 :         b64_from_24bit(alt_result[25], alt_result[46], alt_result[4], 4);
     591           9 :         b64_from_24bit(alt_result[47], alt_result[5], alt_result[26], 4);
     592           9 :         b64_from_24bit(alt_result[6], alt_result[27], alt_result[48], 4);
     593           9 :         b64_from_24bit(alt_result[28], alt_result[49], alt_result[7], 4);
     594           9 :         b64_from_24bit(alt_result[50], alt_result[8], alt_result[29], 4);
     595           9 :         b64_from_24bit(alt_result[9], alt_result[30], alt_result[51], 4);
     596           9 :         b64_from_24bit(alt_result[31], alt_result[52], alt_result[10], 4);
     597           9 :         b64_from_24bit(alt_result[53], alt_result[11], alt_result[32], 4);
     598           9 :         b64_from_24bit(alt_result[12], alt_result[33], alt_result[54], 4);
     599           9 :         b64_from_24bit(alt_result[34], alt_result[55], alt_result[13], 4);
     600           9 :         b64_from_24bit(alt_result[56], alt_result[14], alt_result[35], 4);
     601           9 :         b64_from_24bit(alt_result[15], alt_result[36], alt_result[57], 4);
     602           9 :         b64_from_24bit(alt_result[37], alt_result[58], alt_result[16], 4);
     603           9 :         b64_from_24bit(alt_result[59], alt_result[17], alt_result[38], 4);
     604           9 :         b64_from_24bit(alt_result[18], alt_result[39], alt_result[60], 4);
     605           9 :         b64_from_24bit(alt_result[40], alt_result[61], alt_result[19], 4);
     606           9 :         b64_from_24bit(alt_result[62], alt_result[20], alt_result[41], 4);
     607           9 :         b64_from_24bit(0, 0, alt_result[63], 2);
     608             : 
     609           9 :         if (buflen <= 0) {
     610           0 :                 errno = ERANGE;
     611           0 :                 buffer = NULL;
     612             :         } else {
     613           9 :                 *cp = '\0';             /* Terminate the string.  */
     614             :         }
     615             : 
     616             :         /* Clear the buffer for the intermediate result so that people
     617             :          attaching to processes or reading core dumps cannot get any
     618             :          information.  We do it in this way to clear correct_words[]
     619             :          inside the SHA512 implementation as well.  */
     620           9 :         sha512_init_ctx(&ctx);
     621           9 :         sha512_finish_ctx(&ctx, alt_result);
     622           9 :         memset(temp_result, '\0', sizeof(temp_result));
     623           9 :         memset(p_bytes, '\0', key_len);
     624           9 :         memset(s_bytes, '\0', salt_len);
     625           9 :         memset(&ctx, '\0', sizeof(ctx));
     626           9 :         memset(&alt_ctx, '\0', sizeof(alt_ctx));
     627           9 :         if (copied_key != NULL) {
     628           0 :                 memset(copied_key, '\0', key_len);
     629             :         }
     630           9 :         if (copied_salt != NULL) {
     631           7 :                 memset(copied_salt, '\0', salt_len);
     632             :         }
     633             : 
     634           9 :         return buffer;
     635             : }
     636             : 
     637             : 
     638             : /* This entry point is equivalent to the `crypt' function in Unix
     639             :    libcs.  */
     640             : char *
     641           0 : php_sha512_crypt(const char *key, const char *salt) {
     642             :         /* We don't want to have an arbitrary limit in the size of the
     643             :          password.  We can compute an upper bound for the size of the
     644             :          result in advance and so we can prepare the buffer we pass to
     645             :          `sha512_crypt_r'.  */
     646             :         static char *buffer;
     647             :         static int buflen;
     648           0 :         int needed = (int)(sizeof(sha512_salt_prefix) - 1
     649             :                 + sizeof(sha512_rounds_prefix) + 9 + 1
     650           0 :                 + strlen(salt) + 1 + 86 + 1);
     651             : 
     652           0 :         if (buflen < needed) {
     653           0 :                 char *new_buffer = (char *) realloc(buffer, needed);
     654           0 :                 if (new_buffer == NULL) {
     655           0 :                         return NULL;
     656             :                 }
     657             : 
     658           0 :                 buffer = new_buffer;
     659           0 :                 buflen = needed;
     660             :         }
     661             : 
     662           0 :         return php_sha512_crypt_r (key, salt, buffer, buflen);
     663             : }
     664             : 
     665             : #ifdef TEST
     666             : static const struct {
     667             :         const char *input;
     668             :         const char result[64];
     669             : } tests[] =
     670             :         {
     671             :         /* Test vectors from FIPS 180-2: appendix C.1.  */
     672             :         { "abc",
     673             :           "\xdd\xaf\x35\xa1\x93\x61\x7a\xba\xcc\x41\x73\x49\xae\x20\x41\x31"
     674             :           "\x12\xe6\xfa\x4e\x89\xa9\x7e\xa2\x0a\x9e\xee\xe6\x4b\x55\xd3\x9a"
     675             :           "\x21\x92\x99\x2a\x27\x4f\xc1\xa8\x36\xba\x3c\x23\xa3\xfe\xeb\xbd"
     676             :           "\x45\x4d\x44\x23\x64\x3c\xe8\x0e\x2a\x9a\xc9\x4f\xa5\x4c\xa4\x9f" },
     677             :         /* Test vectors from FIPS 180-2: appendix C.2.  */
     678             :         { "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn"
     679             :           "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
     680             :           "\x8e\x95\x9b\x75\xda\xe3\x13\xda\x8c\xf4\xf7\x28\x14\xfc\x14\x3f"
     681             :           "\x8f\x77\x79\xc6\xeb\x9f\x7f\xa1\x72\x99\xae\xad\xb6\x88\x90\x18"
     682             :           "\x50\x1d\x28\x9e\x49\x00\xf7\xe4\x33\x1b\x99\xde\xc4\xb5\x43\x3a"
     683             :           "\xc7\xd3\x29\xee\xb6\xdd\x26\x54\x5e\x96\xe5\x5b\x87\x4b\xe9\x09" },
     684             :         /* Test vectors from the NESSIE project.  */
     685             :         { "",
     686             :           "\xcf\x83\xe1\x35\x7e\xef\xb8\xbd\xf1\x54\x28\x50\xd6\x6d\x80\x07"
     687             :           "\xd6\x20\xe4\x05\x0b\x57\x15\xdc\x83\xf4\xa9\x21\xd3\x6c\xe9\xce"
     688             :           "\x47\xd0\xd1\x3c\x5d\x85\xf2\xb0\xff\x83\x18\xd2\x87\x7e\xec\x2f"
     689             :           "\x63\xb9\x31\xbd\x47\x41\x7a\x81\xa5\x38\x32\x7a\xf9\x27\xda\x3e" },
     690             :         { "a",
     691             :           "\x1f\x40\xfc\x92\xda\x24\x16\x94\x75\x09\x79\xee\x6c\xf5\x82\xf2"
     692             :           "\xd5\xd7\xd2\x8e\x18\x33\x5d\xe0\x5a\xbc\x54\xd0\x56\x0e\x0f\x53"
     693             :           "\x02\x86\x0c\x65\x2b\xf0\x8d\x56\x02\x52\xaa\x5e\x74\x21\x05\x46"
     694             :           "\xf3\x69\xfb\xbb\xce\x8c\x12\xcf\xc7\x95\x7b\x26\x52\xfe\x9a\x75" },
     695             :         { "message digest",
     696             :           "\x10\x7d\xbf\x38\x9d\x9e\x9f\x71\xa3\xa9\x5f\x6c\x05\x5b\x92\x51"
     697             :           "\xbc\x52\x68\xc2\xbe\x16\xd6\xc1\x34\x92\xea\x45\xb0\x19\x9f\x33"
     698             :           "\x09\xe1\x64\x55\xab\x1e\x96\x11\x8e\x8a\x90\x5d\x55\x97\xb7\x20"
     699             :           "\x38\xdd\xb3\x72\xa8\x98\x26\x04\x6d\xe6\x66\x87\xbb\x42\x0e\x7c" },
     700             :         { "abcdefghijklmnopqrstuvwxyz",
     701             :           "\x4d\xbf\xf8\x6c\xc2\xca\x1b\xae\x1e\x16\x46\x8a\x05\xcb\x98\x81"
     702             :           "\xc9\x7f\x17\x53\xbc\xe3\x61\x90\x34\x89\x8f\xaa\x1a\xab\xe4\x29"
     703             :           "\x95\x5a\x1b\xf8\xec\x48\x3d\x74\x21\xfe\x3c\x16\x46\x61\x3a\x59"
     704             :           "\xed\x54\x41\xfb\x0f\x32\x13\x89\xf7\x7f\x48\xa8\x79\xc7\xb1\xf1" },
     705             :         { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
     706             :           "\x20\x4a\x8f\xc6\xdd\xa8\x2f\x0a\x0c\xed\x7b\xeb\x8e\x08\xa4\x16"
     707             :           "\x57\xc1\x6e\xf4\x68\xb2\x28\xa8\x27\x9b\xe3\x31\xa7\x03\xc3\x35"
     708             :           "\x96\xfd\x15\xc1\x3b\x1b\x07\xf9\xaa\x1d\x3b\xea\x57\x78\x9c\xa0"
     709             :           "\x31\xad\x85\xc7\xa7\x1d\xd7\x03\x54\xec\x63\x12\x38\xca\x34\x45" },
     710             :         { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
     711             :           "\x1e\x07\xbe\x23\xc2\x6a\x86\xea\x37\xea\x81\x0c\x8e\xc7\x80\x93"
     712             :           "\x52\x51\x5a\x97\x0e\x92\x53\xc2\x6f\x53\x6c\xfc\x7a\x99\x96\xc4"
     713             :           "\x5c\x83\x70\x58\x3e\x0a\x78\xfa\x4a\x90\x04\x1d\x71\xa4\xce\xab"
     714             :           "\x74\x23\xf1\x9c\x71\xb9\xd5\xa3\xe0\x12\x49\xf0\xbe\xbd\x58\x94" },
     715             :         { "123456789012345678901234567890123456789012345678901234567890"
     716             :           "12345678901234567890",
     717             :           "\x72\xec\x1e\xf1\x12\x4a\x45\xb0\x47\xe8\xb7\xc7\x5a\x93\x21\x95"
     718             :           "\x13\x5b\xb6\x1d\xe2\x4e\xc0\xd1\x91\x40\x42\x24\x6e\x0a\xec\x3a"
     719             :           "\x23\x54\xe0\x93\xd7\x6f\x30\x48\xb4\x56\x76\x43\x46\x90\x0c\xb1"
     720             :           "\x30\xd2\xa4\xfd\x5d\xd1\x6a\xbb\x5e\x30\xbc\xb8\x50\xde\xe8\x43" }
     721             :   };
     722             : #define ntests (sizeof (tests) / sizeof (tests[0]))
     723             : 
     724             : 
     725             : static const struct
     726             : {
     727             :         const char *salt;
     728             :         const char *input;
     729             :         const char *expected;
     730             : } tests2[] = {
     731             :         { "$6$saltstring", "Hello world!",
     732             :         "$6$saltstring$svn8UoSVapNtMuq1ukKS4tPQd8iKwSMHWjl/O817G3uBnIFNjnQJu"
     733             :         "esI68u4OTLiBFdcbYEdFCoEOfaS35inz1"},
     734             :         { "$6$rounds=10000$saltstringsaltstring", "Hello world!",
     735             :         "$6$rounds=10000$saltstringsaltst$OW1/O6BYHV6BcXZu8QVeXbDWra3Oeqh0sb"
     736             :         "HbbMCVNSnCM/UrjmM0Dp8vOuZeHBy/YTBmSK6H9qs/y3RnOaw5v." },
     737             :         { "$6$rounds=5000$toolongsaltstring", "This is just a test",
     738             :         "$6$rounds=5000$toolongsaltstrin$lQ8jolhgVRVhY4b5pZKaysCLi0QBxGoNeKQ"
     739             :         "zQ3glMhwllF7oGDZxUhx1yxdYcz/e1JSbq3y6JMxxl8audkUEm0" },
     740             :         { "$6$rounds=1400$anotherlongsaltstring",
     741             :         "a very much longer text to encrypt.  This one even stretches over more"
     742             :         "than one line.",
     743             :         "$6$rounds=1400$anotherlongsalts$POfYwTEok97VWcjxIiSOjiykti.o/pQs.wP"
     744             :         "vMxQ6Fm7I6IoYN3CmLs66x9t0oSwbtEW7o7UmJEiDwGqd8p4ur1" },
     745             :         { "$6$rounds=77777$short",
     746             :         "we have a short salt string but not a short password",
     747             :         "$6$rounds=77777$short$WuQyW2YR.hBNpjjRhpYD/ifIw05xdfeEyQoMxIXbkvr0g"
     748             :         "ge1a1x3yRULJ5CCaUeOxFmtlcGZelFl5CxtgfiAc0" },
     749             :         { "$6$rounds=123456$asaltof16chars..", "a short string",
     750             :         "$6$rounds=123456$asaltof16chars..$BtCwjqMJGx5hrJhZywWvt0RLE8uZ4oPwc"
     751             :         "elCjmw2kSYu.Ec6ycULevoBK25fs2xXgMNrCzIMVcgEJAstJeonj1" },
     752             :         { "$6$rounds=10$roundstoolow", "the minimum number is still observed",
     753             :         "$6$rounds=1000$roundstoolow$kUMsbe306n21p9R.FRkW3IGn.S9NPN0x50YhH1x"
     754             :         "hLsPuWGsUSklZt58jaTfF4ZEQpyUNGc0dqbpBYYBaHHrsX." },
     755             : };
     756             : #define ntests2 (sizeof (tests2) / sizeof (tests2[0]))
     757             : 
     758             : 
     759             : int main (void) {
     760             :         struct sha512_ctx ctx;
     761             :         char sum[64];
     762             :         int result = 0;
     763             :         int cnt;
     764             :         int i;
     765             :         char buf[1000];
     766             :         static const char expected[64] =
     767             :                 "\xe7\x18\x48\x3d\x0c\xe7\x69\x64\x4e\x2e\x42\xc7\xbc\x15\xb4\x63"
     768             :                 "\x8e\x1f\x98\xb1\x3b\x20\x44\x28\x56\x32\xa8\x03\xaf\xa9\x73\xeb"
     769             :                 "\xde\x0f\xf2\x44\x87\x7e\xa6\x0a\x4c\xb0\x43\x2c\xe5\x77\xc3\x1b"
     770             :                 "\xeb\x00\x9c\x5c\x2c\x49\xaa\x2e\x4e\xad\xb2\x17\xad\x8c\xc0\x9b";
     771             : 
     772             :         for (cnt = 0; cnt < (int) ntests; ++cnt) {
     773             :                 sha512_init_ctx (&ctx);
     774             :                 sha512_process_bytes (tests[cnt].input, strlen (tests[cnt].input), &ctx);
     775             :                 sha512_finish_ctx (&ctx, sum);
     776             :                 if (memcmp (tests[cnt].result, sum, 64) != 0) {
     777             :                         printf ("test %d run %d failed\n", cnt, 1);
     778             :                         result = 1;
     779             :                 }
     780             : 
     781             :                 sha512_init_ctx (&ctx);
     782             :                 for (i = 0; tests[cnt].input[i] != '\0'; ++i) {
     783             :                         sha512_process_bytes (&tests[cnt].input[i], 1, &ctx);
     784             :                 }
     785             :                 sha512_finish_ctx (&ctx, sum);
     786             :                 if (memcmp (tests[cnt].result, sum, 64) != 0) {
     787             :                         printf ("test %d run %d failed\n", cnt, 2);
     788             :                         result = 1;
     789             :                 }
     790             :         }
     791             : 
     792             :         /* Test vector from FIPS 180-2: appendix C.3.  */
     793             : 
     794             :         memset (buf, 'a', sizeof (buf));
     795             :         sha512_init_ctx (&ctx);
     796             :         for (i = 0; i < 1000; ++i) {
     797             :                 sha512_process_bytes (buf, sizeof (buf), &ctx);
     798             :         }
     799             : 
     800             :         sha512_finish_ctx (&ctx, sum);
     801             :         if (memcmp (expected, sum, 64) != 0) {
     802             :                 printf ("test %d failed\n", cnt);
     803             :                 result = 1;
     804             :         }
     805             : 
     806             :         for (cnt = 0; cnt < ntests2; ++cnt) {
     807             :                 char *cp = php_sha512_crypt(tests2[cnt].input, tests2[cnt].salt);
     808             : 
     809             :                 if (strcmp (cp, tests2[cnt].expected) != 0) {
     810             :                         printf ("test %d: expected \"%s\", got \"%s\"\n",
     811             :                                         cnt, tests2[cnt].expected, cp);
     812             :                         result = 1;
     813             :                 }
     814             :         }
     815             : 
     816             :         if (result == 0) {
     817             :                 puts ("all tests OK");
     818             :         }
     819             : 
     820             :         return result;
     821             : }
     822             : #endif

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