online
     €ГИ„„ыВїЖ ?ч     /* SHA256-based Unix crypt implementation.
   Released into the Public Domain by Ulrich Drepper <drepper@redhat.com>.  */
/* Windows VC++ port by Pierre Joye <pierre@php.net> */

#include "php.h"
#include "php_main.h"

#include <errno.h>
#include <limits.h>

#ifdef PHP_WIN32
# define __alignof__ __alignof
# define alloca _alloca
#else
# ifndef HAVE_ALIGNOF
#  include <stddef.h>
#  define __alignof__(type) offsetof (struct { char c; type member;}, member)
# endif
# if HAVE_ATTRIBUTE_ALIGNED
#  define ALIGNED(size) __attribute__ ((__aligned__ (size)))
# else
#  define ALIGNED(size)
# endif
#endif

#include <stdio.h>
#include <stdlib.h>

#ifdef PHP_WIN32
# include <string.h>
#else
# include <sys/param.h>
# include <sys/types.h>
# if HAVE_STRING_H
#  include <string.h>
# else
#  include <strings.h>
# endif
#endif

char * __php_stpncpy(char *dst, const char *src, size_t len)
{
	size_t n = strlen(src);
	if (n > len) {
		n = len;
	}
	return strncpy(dst, src, len) + n;
}

void * __php_mempcpy(void * dst, const void * src, size_t len)
{
	return (((char *)memcpy(dst, src, len)) + len);
}

#ifndef MIN
# define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
# define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif

/* Structure to save state of computation between the single steps.  */
struct sha256_ctx {
	uint32_t H[8];

	uint32_t total[2];
	uint32_t buflen;
	char buffer[128]; /* NB: always correctly aligned for uint32_t.  */
};

#if PHP_WIN32 || (!defined(WORDS_BIGENDIAN))
# define SWAP(n) \
    (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
#else
# define SWAP(n) (n)
#endif

/* This array contains the bytes used to pad the buffer to the next
   64-byte boundary.  (FIPS 180-2:5.1.1)  */
static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */ };


/* Constants for SHA256 from FIPS 180-2:4.2.2.  */
static const uint32_t K[64] = {
	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};


/* Process LEN bytes of BUFFER, accumulating context into CTX.
   It is assumed that LEN % 64 == 0.  */
static void sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx) {
	const uint32_t *words = buffer;
	size_t nwords = len / sizeof (uint32_t);
	unsigned int t;

	uint32_t a = ctx->H[0];
	uint32_t b = ctx->H[1];
	uint32_t c = ctx->H[2];
	uint32_t d = ctx->H[3];
	uint32_t e = ctx->H[4];
	uint32_t f = ctx->H[5];
	uint32_t g = ctx->H[6];
	uint32_t h = ctx->H[7];

	/* First increment the byte count.  FIPS 180-2 specifies the possible
	 length of the file up to 2^64 bits.  Here we only compute the
	 number of bytes.  Do a double word increment.  */
	ctx->total[0] += len;
	if (ctx->total[0] < len) {
		++ctx->total[1];
	}

	/* Process all bytes in the buffer with 64 bytes in each round of
	 the loop.  */
	while (nwords > 0) {
		uint32_t W[64];
		uint32_t a_save = a;
		uint32_t b_save = b;
		uint32_t c_save = c;
		uint32_t d_save = d;
		uint32_t e_save = e;
		uint32_t f_save = f;
		uint32_t g_save = g;
		uint32_t h_save = h;

	/* Operators defined in FIPS 180-2:4.1.2.  */
#define Ch(x, y, z) ((x & y) ^ (~x & z))
#define Maj(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
#define S0(x) (CYCLIC (x, 2) ^ CYCLIC (x, 13) ^ CYCLIC (x, 22))
#define S1(x) (CYCLIC (x, 6) ^ CYCLIC (x, 11) ^ CYCLIC (x, 25))
#define R0(x) (CYCLIC (x, 7) ^ CYCLIC (x, 18) ^ (