/*
   +----------------------------------------------------------------------+
   | HipHop for PHP                                                       |
   +----------------------------------------------------------------------+
   | Copyright (c) 2010-2015 Facebook, Inc. (http://www.facebook.com)     |
   | Copyright (c) 1998-2010 Zend Technologies Ltd. (http://www.zend.com) |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
*/

#include "hphp/zend/zend-string.h"
#include <cinttypes>
#include "hphp/util/assertions.h"
#include "hphp/util/mutex.h"
#include "hphp/util/lock.h"

namespace HPHP {

//////////////////////////////////////////////////////////////////////

void string_translate(char *str, int len, const char *str_from,
                      const char *str_to, int trlen) {
  int i;
  unsigned char xlat[256];

  if ((trlen < 1) || (len < 1)) {
    return;
  }

  for (i = 0; i < 256; xlat[i] = i, i++);
  for (i = 0; i < trlen; i++) {
    xlat[(unsigned char) str_from[i]] = str_to[i];
  }

  for (i = 0; i < len; i++) {
    str[i] = xlat[(unsigned char) str[i]];
  }
}

char *string_rot13(const char *input, int len) {
  assert(input);

  static char rot13_from[] =
    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  static char rot13_to[] =
    "nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM";

  if (len == 0) {
    return nullptr;
  }
  char *ret = string_duplicate(input, len);
  string_translate(ret, len, rot13_from, rot13_to, 52);
  return ret;
}

///////////////////////////////////////////////////////////////////////////////
// crc32

/*
 * This code implements the AUTODIN II polynomial
 * The variable corresponding to the macro argument "crc" should
 * be an unsigned long.
 * Original code  by Spencer Garrett <srg@quick.com>
 */

#define CRC32(crc, ch) (crc = (crc >> 8) ^ crc32tab[(crc ^ (ch)) & 0xff])

/* generated using the AUTODIN II polynomial
 *  x^32 + x^26 + x^23 + x^22 + x^16 +
 *  x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
 */
static const unsigned int crc32tab[256] = {
  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
  0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
  0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
  0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
  0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
  0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
  0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
  0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
  0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
  0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
  0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
  0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
  0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
  0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
  0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
  0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
  0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
  0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
  0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
  0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
  0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
  0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
  0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
  0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
  0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
  0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
  0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
  0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
  0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
  0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
  0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
  0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
  0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
  0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
  0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
  0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};

int string_crc32(const char *p, int len) {
  uint32_t crcinit = 0;
  register int32_t crc = crcinit ^ 0xFFFFFFFF;
  for (; len--; ++p) {
    crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF];
  }
  return crc ^ 0xFFFFFFFF;
}

///////////////////////////////////////////////////////////////////////////////
// crypt

#ifdef _MSC_VER
#define PHP_CRYPT_R_MSVC 1
#include "hphp/zend/php-crypt_r.h"

char* php_crypt_r_msvc(const char* key, const char* salt) {
  if (salt[0] == '$' && salt[1] == '1' && salt[2] == '$') {
    char output[MD5_HASH_MAX_LEN], *out;

    out = php_md5_crypt_r(key, salt, output);
    return out ? strdup(out) : nullptr;
  } else if (salt[0] == '$' && salt[1] == '6' && salt[2] == '$') {
    char output[PHP_MAX_SALT_LEN + 1];

    char* crypt_res = php_sha512_crypt_r(key, salt, output, PHP_MAX_SALT_LEN);
    if (!crypt_res) {
      SecureZeroMemory(output, PHP_MAX_SALT_LEN + 1);
      return nullptr;
    } else {
      char* result = strdup(output);
      SecureZeroMemory(output, PHP_MAX_SALT_LEN + 1);
      return result;
    }
  } else if (salt[0] == '$' && salt[1] == '5' && salt[2] == '$') {
    char output[PHP_MAX_SALT_LEN + 1];

    char* crypt_res = php_sha256_crypt_r(key, salt, output, PHP_MAX_SALT_LEN);
    if (!crypt_res) {
      SecureZeroMemory(output, PHP_MAX_SALT_LEN + 1);
      return nullptr;
    } else {
      char* result = strdup(output);
      SecureZeroMemory(output, PHP_MAX_SALT_LEN + 1);
      return result;
    }
  } else if (
    salt[0] == '$' &&
    salt[1] == '2' &&
    salt[3] == '$') {
    char output[PHP_MAX_SALT_LEN + 1];

    memset(output, 0, PHP_MAX_SALT_LEN + 1);

    char* crypt_res = php_crypt_blowfish_rn(key, salt, output, sizeof(output));
    if (!crypt_res) {
      SecureZeroMemory(output, PHP_MAX_SALT_LEN + 1);
      return nullptr;
    } else {
      char* result = strdup(output);
      SecureZeroMemory(output, PHP_MAX_SALT_LEN + 1);
      return result;
    }
  } else if (salt[0] == '*' && (salt[1] == '0' || salt[1] == '1')) {
    return nullptr;
  } else {
    struct php_crypt_extended_data buffer;
    /* DES Fallback */
    memset(&buffer, 0, sizeof(buffer));
    _crypt_extended_init_r();

    char* crypt_res = _crypt_extended_r(key, salt, &buffer);
    if (!crypt_res || (salt[0] == '*' && salt[1] == '0')) {
      return nullptr;
    } else {
      return strdup(crypt_res);
    }
  }
}

#else
#include <unistd.h>
#if !defined(__APPLE__) && !defined(__FreeBSD__)
# include <crypt.h>
#endif
#endif
#include "hphp/zend/crypt-blowfish.h"

static unsigned char itoa64[] =
  "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static void ito64(char *s, long v, int n) {
  while (--n >= 0) {
    *s++ = itoa64[v&0x3f];
    v >>= 6;
  }
}

char *string_crypt(const char *key, const char *salt) {
  assert(key);
  assert(salt);

  char random_salt[12];
  if (!*salt) {
    memcpy(random_salt,"$1$",3);
    ito64(random_salt+3,rand(),8);
    random_salt[11] = '\0';
    return string_crypt(key, random_salt);
  }

  if ((strlen(salt) > sizeof("$2X$00$")) &&
    (salt[0] == '$') &&
    (salt[1] == '2') &&
    (salt[2] >= 'a') && (salt[2] <= 'z') &&
    (salt[3] == '$') &&
    (salt[4] >= '0') && (salt[4] <= '3') &&
    (salt[5] >= '0') && (salt[5] <= '9') &&
    (salt[6] == '$')) {
    // Bundled blowfish crypt()
    char output[61];
    if (php_crypt_blowfish_rn(key, salt, output, sizeof(output))) {
      return strdup(output);
    }

  } else {
    // System crypt() function
#ifdef HAVE_CRYPT_R
# if defined(CRYPT_R_STRUCT_CRYPT_DATA)
    struct crypt_data buffer;
    memset(&buffer, 0, sizeof(buffer));
# elif defined(CRYPT_R_CRYPTD)
    CRYPTD buffer;
# else
#  error "Data struct used by crypt_r() is unknown. Please report."
# endif
    char *crypt_res = crypt_r(key, salt, &buffer);
#elif defined(PHP_CRYPT_R_MSVC)
    return php_crypt_r_msvc(key, salt);
#else
    static Mutex mutex;
    Lock lock(mutex);
    char *crypt_res = crypt(key,salt);
#endif

#ifndef PHP_CRYPT_R_MSVC
    if (crypt_res) {
      return strdup(crypt_res);
    }
#endif
  }

  return ((salt[0] == '*') && (salt[1] == '0'))
                  ? strdup("*1") : strdup("*0");
}

//////////////////////////////////////////////////////////////////////

char *string_bin2hex(const char *input, int len, char* result) {
  static char hexconvtab[] = "0123456789abcdef";

  assert(input);
  if (len == 0) {
    return nullptr;
  }

  int i, j;
  for (i = j = 0; i < len; i++) {
    result[j++] = hexconvtab[(unsigned char)input[i] >> 4];
    result[j++] = hexconvtab[(unsigned char)input[i] & 15];
  }
  result[j] = '\0';
  len = j;
  return result;
}

char *string_bin2hex(const char *input, int &len) {
  if (!len) return nullptr;
  int inLen = len;
  int outLen = inLen * 2;
  char* result = (char*)malloc(outLen + 1);
  len = outLen;
  return string_bin2hex(input, inLen, result);
}

//////////////////////////////////////////////////////////////////////

}
