/*

   +----------------------------------------------------------------------+

   | Copyright © The PHP Group and Contributors.                          |

   +----------------------------------------------------------------------+

   | This source file is subject to the Modified BSD License that is      |

   | bundled with this package in the file LICENSE, and is available      |

   | through the World Wide Web at <https://www.php.net/license/>.        |

   |                                                                      |

   | SPDX-License-Identifier: BSD-3-Clause                                |

   +----------------------------------------------------------------------+

   | Author: Alexander Peslyak (Solar Designer) <solar at openwall.com>   |

   |         Lachlan Roche                                                |

   |         Alessandro Astarita <aleast@capri.it>                        |

   +----------------------------------------------------------------------+

*/

#include "php.h"

#include "md5.h"

PHPAPI void make_digest(char *md5str, const unsigned char *digest)

{

  make_digest_ex(md5str, digest, 16);

}

PHPAPI void make_digest_ex(char *md5str, const unsigned char *digest, size_t len)

{

  static const char hexits[17] = "0123456789abcdef";

  for (size_t i = 0; i < len; i++) {

    md5str[i * 2]       = hexits[digest[i] >> 4];

    md5str[(i * 2) + 1] = hexits[digest[i] &  0x0F];

  }

  md5str[len * 2] = '\0';

}

/* Calculate the md5 hash of a string */

PHP_FUNCTION(md5)

{

  zend_string *arg;

  PHP_MD5_CTX context;

  unsigned char digest[16];

  bool raw_output = false;

  ZEND_PARSE_PARAMETERS_START(1, 2)

    Z_PARAM_STR(arg)

    Z_PARAM_OPTIONAL

    Z_PARAM_BOOL(raw_output)

  ZEND_PARSE_PARAMETERS_END();

  PHP_MD5Init(&context);

  PHP_MD5Update(&context, ZSTR_VAL(arg), ZSTR_LEN(arg));

  PHP_MD5Final(digest, &context);

  if (raw_output) {

    RETURN_STRINGL((char *) digest, 16);

  } else {

    RETVAL_NEW_STR(zend_string_alloc(32, 0));

    make_digest_ex(Z_STRVAL_P(return_value), digest, 16);

  }

}

/* Calculate the md5 hash of given filename */

PHP_FUNCTION(md5_file)

{

  char          *arg;

  size_t           arg_len;

  bool raw_output = false;

  unsigned char buf[1024];

  unsigned char digest[16];

  PHP_MD5_CTX   context;

  ssize_t       n;

  php_stream    *stream;

  ZEND_PARSE_PARAMETERS_START(1, 2)

    Z_PARAM_PATH(arg, arg_len)

    Z_PARAM_OPTIONAL

    Z_PARAM_BOOL(raw_output)

  ZEND_PARSE_PARAMETERS_END();

  stream = php_stream_open_wrapper(arg, "rb", REPORT_ERRORS, NULL);

  if (!stream) {

    RETURN_FALSE;

  }

  PHP_MD5Init(&context);

  while ((n = php_stream_read(stream, (char*)buf, sizeof(buf))) > 0) {

    PHP_MD5Update(&context, buf, n);

  }

  /* XXX this probably can be improved with some number of retries */

  if (!php_stream_eof(stream)) {

    php_stream_close(stream);

    PHP_MD5Final(digest, &context);

    RETURN_FALSE;

  }

  php_stream_close(stream);

  PHP_MD5Final(digest, &context);

  if (raw_output) {

    RETURN_STRINGL((char *) digest, 16);

  } else {

    RETVAL_NEW_STR(zend_string_alloc(32, 0));

    make_digest_ex(Z_STRVAL_P(return_value), digest, 16);

  }

}

/*

 * This is an OpenSSL-compatible implementation of the RSA Data Security,

 * Inc. MD5 Message-Digest Algorithm (RFC 1321).

 *

 * Written by Solar Designer <solar at openwall.com> in 2001, and placed

 * in the public domain.  There's absolutely no warranty.

 *

 * This differs from Colin Plumb's older public domain implementation in

 * that no 32-bit integer data type is required, there's no compile-time

 * endianness configuration, and the function prototypes match OpenSSL's.

 * The primary goals are portability and ease of use.

 *

 * This implementation is meant to be fast, but not as fast as possible.

 * Some known optimizations are not included to reduce source code size

 * and avoid compile-time configuration.

 */

#include <string.h>

/*

 * The basic MD5 functions.

 *

 * F and G are optimized compared to their RFC 1321 definitions for

 * architectures that lack an AND-NOT instruction, just like in Colin Plumb's

 * implementation.

 */

#define F(x, y, z)      ((z) ^ ((x) & ((y) ^ (z))))

#define G(x, y, z)      ((y) ^ ((z) & ((x) ^ (y))))

#define H(x, y, z)      ((x) ^ (y) ^ (z))

#define I(x, y, z)      ((y) ^ ((x) | ~(z)))

/*

 * The MD5 transformation for all four rounds.

 */

#define STEP(f, a, b, c, d, x, t, s) \

  (a) += f((b), (c), (d)) + (x) + (t); \

  (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \

  (a) += (b);

/*

 * SET reads 4 input bytes in little-endian byte order and stores them

 * in a properly aligned word in host byte order.

 *

 * The check for little-endian architectures that tolerate unaligned

 * memory accesses is just an optimization.  Nothing will break if it

 * doesn't work.

 */

#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)

typedef ZEND_SET_ALIGNED(1, uint32_t unaligned_uint32_t);

# define SET(n) \

  (*(unaligned_uint32_t *)&ptr[(n) * 4])

# define GET(n) \

  SET(n)

#else

# define SET(n) \

  (ctx->block[(n)] = \

  (uint32_t)ptr[(n) * 4] | \

  ((uint32_t)ptr[(n) * 4 + 1] << 8) | \

  ((uint32_t)ptr[(n) * 4 + 2] << 16) | \

  ((uint32_t)ptr[(n) * 4 + 3] << 24))

# define GET(n) \

  (ctx->block[(n)])

#endif

/*

 * This processes one or more 64-byte data blocks, but does NOT update

 * the bit counters.  There are no alignment requirements.

 */

static const void *body(PHP_MD5_CTX *ctx, const void *data, size_t size)

{

  const unsigned char *ptr;

  uint32_t a, b, c, d;

  uint32_t saved_a, saved_b, saved_c, saved_d;

  ptr = data;

  a = ctx->a;

  b = ctx->b;

  c = ctx->c;

  d = ctx->d;

  do {

    saved_a = a;

    saved_b = b;

    saved_c = c;

    saved_d = d;

/* Round 1 */

    STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)

    STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)

    STEP(F, c, d, a, b, SET(2), 0x242070db, 17)

    STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)

    STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)

    STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)

    STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)

    STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)

    STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)

    STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)

    STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)

    STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)

    STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)

    STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)

    STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)

    STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)

/* Round 2 */

    STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)

    STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)

    STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)

    STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)

    STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)

    STEP(G, d, a, b, c, GET(10), 0x02441453, 9)

    STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)

    STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)

    STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)

    STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)

    STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)

    STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)

    STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)

    STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)

    STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)

    STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)

/* Round 3 */

    STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)

    STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)

    STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)

    STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)

    STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)

    STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)

    STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)

    STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)

    STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)

    STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)

    STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)

    STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)

    STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)

    STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)

    STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)

    STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)

/* Round 4 */

    STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)

    STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)

    STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)

    STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)

    STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)

    STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)

    STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)

    STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)

    STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)

    STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)

    STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)

    STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)

    STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)

    STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)

    STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)

    STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)

    a += saved_a;

    b += saved_b;

    c += saved_c;

    d += saved_d;

    ptr += 64;

  } while (size -= 64);

  ctx->a = a;

  ctx->b = b;

  ctx->c = c;

  ctx->d = d;

  return ptr;

}

PHPAPI void PHP_MD5InitArgs(PHP_MD5_CTX *ctx, ZEND_ATTRIBUTE_UNUSED HashTable *args)

{

  ctx->a = 0x67452301;

  ctx->b = 0xefcdab89;

  ctx->c = 0x98badcfe;

  ctx->d = 0x10325476;

  ctx->lo = 0;

  ctx->hi = 0;

}

PHPAPI void PHP_MD5Update(PHP_MD5_CTX *ctx, const void *data, size_t size)

{

  uint32_t saved_lo;

  uint32_t used, free;

  saved_lo = ctx->lo;

  if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo) {

    ctx->hi++;

  }

  ctx->hi += size >> 29;

  used = saved_lo & 0x3f;

  if (used) {

    free = 64 - used;

    if (size < free) {

      memcpy(&ctx->buffer[used], data, size);

      return;

    }

    memcpy(&ctx->buffer[used], data, free);

    data = (unsigned char *)data + free;

    size -= free;

    body(ctx, ctx->buffer, 64);

  }

  if (size >= 64) {

    data = body(ctx, data, size & ~(size_t)0x3f);

    size &= 0x3f;

  }

  memcpy(ctx->buffer, data, size);

}

PHPAPI void PHP_MD5Final(unsigned char *result, PHP_MD5_CTX *ctx)

{

  uint32_t used, free;

  used = ctx->lo & 0x3f;

  ctx->buffer[used++] = 0x80;

  free = 64 - used;

  if (free < 8) {

    memset(&ctx->buffer[used], 0, free);

    body(ctx, ctx->buffer, 64);

    used = 0;

    free = 64;

  }

  memset(&ctx->buffer[used], 0, free - 8);

  ctx->lo <<= 3;

  ctx->buffer[56] = ctx->lo;

  ctx->buffer[57] = ctx->lo >> 8;

  ctx->buffer[58] = ctx->lo >> 16;

  ctx->buffer[59] = ctx->lo >> 24;

  ctx->buffer[60] = ctx->hi;

  ctx->buffer[61] = ctx->hi >> 8;

  ctx->buffer[62] = ctx->hi >> 16;

  ctx->buffer[63] = ctx->hi >> 24;

  body(ctx, ctx->buffer, 64);

  result[0] = ctx->a;

  result[1] = ctx->a >> 8;

  result[2] = ctx->a >> 16;

  result[3] = ctx->a >> 24;

  result[4] = ctx->b;

  result[5] = ctx->b >> 8;

  result[6] = ctx->b >> 16;

  result[7] = ctx->b >> 24;

  result[8] = ctx->c;

  result[9] = ctx->c >> 8;

  result[10] = ctx->c >> 16;

  result[11] = ctx->c >> 24;

  result[12] = ctx->d;

  result[13] = ctx->d >> 8;

  result[14] = ctx->d >> 16;

  result[15] = ctx->d >> 24;

  ZEND_SECURE_ZERO(ctx, sizeof(*ctx));

}