/src/php-src/ext/hash/hash.c

Source
/*
  +----------------------------------------------------------------------+
  | 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: Sara Golemon <pollita@php.net>                               |
  |         Scott MacVicar <scottmac@php.net>                            |
  +----------------------------------------------------------------------+
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "php_hash.h"
#include "ext/standard/info.h"
#include "ext/standard/file.h"
#include "ext/standard/php_var.h"

#include "zend_attributes.h"
#include "zend_exceptions.h"
#include "zend_interfaces.h"
#include "zend_smart_str.h"

#include "hash_arginfo.h"

#ifdef PHP_WIN32
# define __alignof__ __alignof
#else
# ifndef HAVE_ALIGNOF
#  include <stddef.h>
#  define __alignof__(type) offsetof (struct { char c; type member;}, member)
# endif
#endif

static HashTable php_hash_hashtable;
zend_class_entry *php_hashcontext_ce;
static zend_object_handlers php_hashcontext_handlers;

#ifdef PHP_MHASH_BC
struct mhash_bc_entry {
  char *mhash_name;
  char *hash_name;
  int value;
};

#define MHASH_NUM_ALGOS 42

static struct mhash_bc_entry mhash_to_hash[MHASH_NUM_ALGOS] = {
  {"CRC32", "crc32", 0}, /* used by bzip */
  {"MD5", "md5", 1},
  {"SHA1", "sha1", 2},
  {"HAVAL256", "haval256,3", 3},
  {NULL, NULL, 4},
  {"RIPEMD160", "ripemd160", 5},
  {NULL, NULL, 6},
  {"TIGER", "tiger192,3", 7},
  {"GOST", "gost", 8},
  {"CRC32B", "crc32b", 9}, /* used by ethernet (IEEE 802.3), gzip, zip, png, etc */
  {"HAVAL224", "haval224,3", 10},
  {"HAVAL192", "haval192,3", 11},
  {"HAVAL160", "haval160,3", 12},
  {"HAVAL128", "haval128,3", 13},
  {"TIGER128", "tiger128,3", 14},
  {"TIGER160", "tiger160,3", 15},
  {"MD4", "md4", 16},
  {"SHA256", "sha256", 17},
  {"ADLER32", "adler32", 18},
  {"SHA224", "sha224", 19},
  {"SHA512", "sha512", 20},
  {"SHA384", "sha384", 21},
  {"WHIRLPOOL", "whirlpool", 22},
  {"RIPEMD128", "ripemd128", 23},
  {"RIPEMD256", "ripemd256", 24},
  {"RIPEMD320", "ripemd320", 25},
  {NULL, NULL, 26}, /* support needs to be added for snefru 128 */
  {"SNEFRU256", "snefru256", 27},
  {"MD2", "md2", 28},
  {"FNV132", "fnv132", 29},
  {"FNV1A32", "fnv1a32", 30},
  {"FNV164", "fnv164", 31},
  {"FNV1A64", "fnv1a64", 32},
  {"JOAAT", "joaat", 33},
  {"CRC32C", "crc32c", 34}, /* Castagnoli's CRC, used by iSCSI, SCTP, Btrfs, ext4, etc */
  {"MURMUR3A", "murmur3a", 35},
  {"MURMUR3C", "murmur3c", 36},
  {"MURMUR3F", "murmur3f", 37},
  {"XXH32", "xxh32", 38},
  {"XXH64", "xxh64", 39},
  {"XXH3", "xxh3", 40},
  {"XXH128", "xxh128", 41},
};
#endif

/* Hash Registry Access */

PHP_HASH_API const php_hash_ops *php_hash_fetch_ops(zend_string *algo) /* {{{ */
{
  const php_hash_ops *ops = zend_hash_find_ptr_lc(&php_hash_hashtable, algo);

  return ops;
}
/* }}} */

PHP_HASH_API void php_hash_register_algo(const char *algo, const php_hash_ops *ops) /* {{{ */
{
  size_t algo_len = strlen(algo);
  char *lower = zend_str_tolower_dup(algo, algo_len);
  zend_hash_add_ptr(&php_hash_hashtable, zend_string_init_interned(lower, algo_len, 1), (void *) ops);
  efree(lower);
}
/* }}} */

PHP_HASH_API zend_result php_hash_copy(const void *ops, const void *orig_context, void *dest_context) /* {{{ */
{
  php_hash_ops *hash_ops = (php_hash_ops *)ops;

  memcpy(dest_context, orig_context, hash_ops->context_size);
  return SUCCESS;
}
/* }}} */


static inline size_t align_to(size_t pos, size_t alignment) {
  size_t offset = pos & (alignment - 1);
  return pos + (offset ? alignment - offset : 0);
}

static size_t parse_serialize_spec(
    const char **specp, size_t *pos, size_t *sz, size_t *max_alignment) {
  size_t count, alignment;
  const char *spec = *specp;
  /* parse size */
  if (*spec == 's' || *spec == 'S') {
    *sz = 2;
    alignment = __alignof__(uint16_t); /* usually 2 */
  } else if (*spec == 'l' || *spec == 'L') {
    *sz = 4;
    alignment = __alignof__(uint32_t); /* usually 4 */
  } else if (*spec == 'q' || *spec == 'Q') {
    *sz = 8;
    alignment = __alignof__(uint64_t); /* usually 8 */
  } else if (*spec == 'i' || *spec == 'I') {
    *sz = sizeof(int);
    alignment = __alignof__(int);      /* usually 4 */
  } else {
    ZEND_ASSERT(*spec == 'b' || *spec == 'B');
    *sz = 1;
    alignment = 1;
  }
  /* process alignment */
  *pos = align_to(*pos, alignment);
  *max_alignment = *max_alignment < alignment ? alignment : *max_alignment;
  /* parse count */
  ++spec;
  if (isdigit((unsigned char) *spec)) {
    count = 0;
    while (isdigit((unsigned char) *spec)) {
      count = 10 * count + *spec - '0';
      ++spec;
    }
  } else {
    count = 1;
  }
  *specp = spec;
  return count;
}

static uint64_t one_from_buffer(size_t sz, const unsigned char *buf) {
  if (sz == 2) {
    const uint16_t *x = (const uint16_t *) buf;
    return *x;
  } else if (sz == 4) {
    const uint32_t *x = (const uint32_t *) buf;
    return *x;
  } else if (sz == 8) {
    const uint64_t *x = (const uint64_t *) buf;
    return *x;
  } else {
    ZEND_ASSERT(sz == 1);
    return *buf;
  }
}

static void one_to_buffer(size_t sz, unsigned char *buf, uint64_t val) {
  if (sz == 2) {
    uint16_t *x = (uint16_t *) buf;
    *x = val;
  } else if (sz == 4) {
    uint32_t *x = (uint32_t *) buf;
    *x = val;
  } else if (sz == 8) {
    uint64_t *x = (uint64_t *) buf;
    *x = val;
  } else {
    ZEND_ASSERT(sz == 1);
    *buf = val;
  }
}

/* Serialize a hash context according to a `spec` string.
   Spec contents:
   b[COUNT] -- serialize COUNT bytes
   s[COUNT] -- serialize COUNT 16-bit integers
   l[COUNT] -- serialize COUNT 32-bit integers
   q[COUNT] -- serialize COUNT 64-bit integers
   i[COUNT] -- serialize COUNT `int`s
   B[COUNT] -- skip COUNT bytes
   S[COUNT], L[COUNT], etc. -- uppercase versions skip instead of read
   . (must be last character) -- assert that the hash context has exactly
       this size
   Example: "llllllb64l16." is the spec for an MD5 context: 6 32-bit
   integers, followed by 64 bytes, then 16 32-bit integers, and that's
   exactly the size of the context.

   The serialization result is an array. Each integer is serialized as a
   32-bit integer, except that a run of 2 or more bytes is encoded as a
   string, and each 64-bit integer is serialized as two 32-bit integers, least
   significant bits first. This allows 32-bit and 64-bit architectures to
   interchange serialized HashContexts. */

PHP_HASH_API hash_spec_result php_hash_serialize_spec(const php_hashcontext_object *hash, zval *zv, const char *spec) /* {{{ */
{
  size_t pos = 0, max_alignment = 1;
  unsigned char *buf = (unsigned char *) hash->context;
  zval tmp;
  if (buf == NULL) {
    return HASH_SPEC_FAILURE;
  }
  array_init(zv);
  while (*spec != '\0' && *spec != '.') {
    char spec_ch = *spec;
    size_t sz, count = parse_serialize_spec(&spec, &pos, &sz, &max_alignment);
    if (pos + count * sz > hash->ops->context_size) {
      return HASH_SPEC_FAILURE;
    }
    if (isupper((unsigned char) spec_ch)) {
      pos += count * sz;
    } else if (sz == 1 && count > 1) {
      ZVAL_STRINGL(&tmp, (char *) buf + pos, count);
      zend_hash_next_index_insert(Z_ARRVAL_P(zv), &tmp);
      pos += count;
    } else {
      while (count > 0) {
        uint64_t val = one_from_buffer(sz, buf + pos);
        pos += sz;
        ZVAL_LONG(&tmp, (int32_t) val);
        zend_hash_next_index_insert(Z_ARRVAL_P(zv), &tmp);
        if (sz == 8) {
          ZVAL_LONG(&tmp, (int32_t) (val >> 32));
          zend_hash_next_index_insert(Z_ARRVAL_P(zv), &tmp);
        }
        --count;
      }
    }
  }
  if (*spec == '.' && align_to(pos, max_alignment) != hash->ops->context_size) {
    return HASH_SPEC_FAILURE;
  }
  return HASH_SPEC_SUCCESS;
}
/* }}} */

/* Unserialize a hash context serialized by `php_hash_serialize_spec` with `spec`. */
PHP_HASH_API hash_spec_result php_hash_unserialize_spec(php_hashcontext_object *hash, const zval *zv, const char *spec) /* {{{ */
{
  size_t pos = 0, max_alignment = 1, j = 0;
  unsigned char *buf = (unsigned char *) hash->context;
  zval *elt;
  if (Z_TYPE_P(zv) != IS_ARRAY) {
    return HASH_SPEC_FAILURE;
  }
  while (*spec != '\0' && *spec != '.') {
    char spec_ch = *spec;
    size_t sz, count = parse_serialize_spec(&spec, &pos, &sz, &max_alignment);
    if (pos + count * sz > hash->ops->context_size) {
      return WRONG_CONTEXT_SIZE;
    }
    if (isupper((unsigned char) spec_ch)) {
      pos += count * sz;
    } else if (sz == 1 && count > 1) {
      elt = zend_hash_index_find(Z_ARRVAL_P(zv), j);
      if (!elt || Z_TYPE_P(elt) != IS_STRING || Z_STRLEN_P(elt) != count) {
        return BYTE_OFFSET_POS_ERROR - pos;
      }
      ++j;
      memcpy(buf + pos, Z_STRVAL_P(elt), count);
      pos += count;
    } else {
      while (count > 0) {
        uint64_t val;
        elt = zend_hash_index_find(Z_ARRVAL_P(zv), j);
        if (!elt || Z_TYPE_P(elt) != IS_LONG) {
          return BYTE_OFFSET_POS_ERROR - pos;
        }
        ++j;
        val = (uint32_t) Z_LVAL_P(elt);
        if (sz == 8) {
          elt = zend_hash_index_find(Z_ARRVAL_P(zv), j);
          if (!elt || Z_TYPE_P(elt) != IS_LONG) {
            return BYTE_OFFSET_POS_ERROR - pos;
          }
          ++j;
          val += ((uint64_t) Z_LVAL_P(elt)) << 32;
        }
        one_to_buffer(sz, buf + pos, val);
        pos += sz;
        --count;
      }
    }
  }
  if (*spec == '.' && align_to(pos, max_alignment) != hash->ops->context_size) {
    return WRONG_CONTEXT_SIZE;
  }

  return HASH_SPEC_SUCCESS;
}
/* }}} */

PHP_HASH_API hash_spec_result php_hash_serialize(const php_hashcontext_object *hash, zend_long *magic, zval *zv) /* {{{ */
{
  if (!hash->ops->serialize_spec) {
        return HASH_SPEC_FAILURE;
    }

    *magic = PHP_HASH_SERIALIZE_MAGIC_SPEC;
    return php_hash_serialize_spec(hash, zv, hash->ops->serialize_spec);
}
/* }}} */

PHP_HASH_API hash_spec_result php_hash_unserialize(php_hashcontext_object *hash, zend_long magic, const zval *zv) /* {{{ */
{
  if (hash->ops->serialize_spec
    && magic == PHP_HASH_SERIALIZE_MAGIC_SPEC) {
    return php_hash_unserialize_spec(hash, zv, hash->ops->serialize_spec);
  }

    return HASH_SPEC_FAILURE;
}
/* }}} */

/* Userspace */

static void php_hash_do_hash(
  zval *return_value, zend_string *algo, char *data, size_t data_len, bool raw_output, bool isfilename, HashTable *args
) /* {{{ */ {
  zend_string *digest;
  const php_hash_ops *ops;
  void *context;
  php_stream *stream = NULL;

  ops = php_hash_fetch_ops(algo);
  if (!ops) {
    zend_argument_value_error(1, "must be a valid hashing algorithm");
    RETURN_THROWS();
  }
  if (isfilename) {
    if (zend_char_has_nul_byte(data, data_len)) {
      zend_argument_value_error(2, "must not contain any null bytes");
      RETURN_THROWS();
    }
    stream = php_stream_open_wrapper_ex(data, "rb", REPORT_ERRORS, NULL, FG(default_context));
    if (!stream) {
      /* Stream will report errors opening file */
      RETURN_FALSE;
    }
  }

  context = php_hash_alloc_context(ops);
  ops->hash_init(context, args);

  if (isfilename) {
    char buf[1024];
    ssize_t n;

    while ((n = php_stream_read(stream, buf, sizeof(buf))) > 0) {
      ops->hash_update(context, (unsigned char *) buf, n);
    }
    php_stream_close(stream);
    if (n < 0) {
      php_hash_free_context(ops, context);
      RETURN_FALSE;
    }
  } else {
    ops->hash_update(context, (unsigned char *) data, data_len);
  }

  digest = zend_string_alloc(ops->digest_size, 0);
  ops->hash_final((unsigned char *) ZSTR_VAL(digest), context);
  php_hash_free_context(ops, context);

  if (raw_output) {
    ZSTR_VAL(digest)[ops->digest_size] = 0;
    RETURN_NEW_STR(digest);
  } else {
    zend_string *hex_digest = zend_string_safe_alloc(ops->digest_size, 2, 0, 0);

    zend_bin2hex(ZSTR_VAL(hex_digest), (unsigned char *) ZSTR_VAL(digest), ops->digest_size);
    ZSTR_VAL(hex_digest)[2 * ops->digest_size] = 0;
    zend_string_efree(digest);
    RETURN_NEW_STR(hex_digest);
  }
}
/* }}} */

/* {{{ Generate a hash of a given input string
Returns lowercase hexits by default */
PHP_FUNCTION(hash)
{
  zend_string *algo;
  char *data;
  size_t data_len;
  bool raw_output = 0;
  HashTable *args = NULL;

  ZEND_PARSE_PARAMETERS_START(2, 4)
    Z_PARAM_STR(algo)
    Z_PARAM_STRING(data, data_len)
    Z_PARAM_OPTIONAL
    Z_PARAM_BOOL(raw_output)
    Z_PARAM_ARRAY_HT(args)
  ZEND_PARSE_PARAMETERS_END();

  php_hash_do_hash(return_value, algo, data, data_len, raw_output, 0, args);
}
/* }}} */

/* {{{ Generate a hash of a given file
Returns lowercase hexits by default */
PHP_FUNCTION(hash_file)
{
  zend_string *algo;
  char *data;
  size_t data_len;
  bool raw_output = 0;
  HashTable *args = NULL;

  ZEND_PARSE_PARAMETERS_START(2, 4)
    Z_PARAM_STR(algo)
    Z_PARAM_STRING(data, data_len)
    Z_PARAM_OPTIONAL
    Z_PARAM_BOOL(raw_output)
    Z_PARAM_ARRAY_HT(args)
  ZEND_PARSE_PARAMETERS_END();

  php_hash_do_hash(return_value, algo, data, data_len, raw_output, 1, args);
}
/* }}} */

static inline void php_hash_string_xor_char(unsigned char *out, const unsigned char *in, const unsigned char xor_with, const size_t length) {
  size_t i;
  for (i=0; i < length; i++) {
    out[i] = in[i] ^ xor_with;
  }
}

static inline void php_hash_string_xor(unsigned char *out, const unsigned char *in, const unsigned char *xor_with, const size_t length) {
  size_t i;
  for (i=0; i < length; i++) {
    out[i] = in[i] ^ xor_with[i];
  }
}

static inline void php_hash_hmac_prep_key(unsigned char *K, const php_hash_ops *ops, void *context, const unsigned char *key, const size_t key_len) {
  memset(K, 0, ops->block_size);
  if (key_len > ops->block_size) {
    /* Reduce the key first */
    ops->hash_init(context, NULL);
    ops->hash_update(context, key, key_len);
    ops->hash_final(K, context);
  } else {
    memcpy(K, key, key_len);
  }
  /* XOR the key with 0x36 to get the ipad) */
  php_hash_string_xor_char(K, K, 0x36, ops->block_size);
}

static inline void php_hash_hmac_round(unsigned char *final, const php_hash_ops *ops, void *context, const unsigned char *key, const unsigned char *data, const zend_long data_size) {
  ops->hash_init(context, NULL);
  ops->hash_update(context, key, ops->block_size);
  ops->hash_update(context, data, data_size);
  ops->hash_final(final, context);
}

static void php_hash_do_hash_hmac(
  zval *return_value, zend_string *algo, char *data, size_t data_len, char *key, size_t key_len, bool raw_output, bool isfilename
) /* {{{ */ {
  zend_string *digest;
  unsigned char *K;
  const php_hash_ops *ops;
  void *context;
  php_stream *stream = NULL;

  ops = php_hash_fetch_ops(algo);
  if (!ops || !ops->is_crypto) {
    zend_argument_value_error(1, "must be a valid cryptographic hashing algorithm");
    RETURN_THROWS();
  }

  if (isfilename) {
    if (zend_char_has_nul_byte(data, data_len)) {
      zend_argument_value_error(2, "must not contain any null bytes");
      RETURN_THROWS();
    }
    stream = php_stream_open_wrapper_ex(data, "rb", REPORT_ERRORS, NULL, FG(default_context));
    if (!stream) {
      /* Stream will report errors opening file */
      RETURN_FALSE;
    }
  }

  context = php_hash_alloc_context(ops);

  K = emalloc(ops->block_size);
  digest = zend_string_alloc(ops->digest_size, 0);

  php_hash_hmac_prep_key(K, ops, context, (unsigned char *) key, key_len);

  if (isfilename) {
    char buf[1024];
    ssize_t n;
    ops->hash_init(context, NULL);
    ops->hash_update(context, K, ops->block_size);
    while ((n = php_stream_read(stream, buf, sizeof(buf))) > 0) {
      ops->hash_update(context, (unsigned char *) buf, n);
    }
    php_stream_close(stream);
    if (n < 0) {
      php_hash_free_context(ops, context);
      efree(K);
      zend_string_efree(digest);
      RETURN_FALSE;
    }

    ops->hash_final((unsigned char *) ZSTR_VAL(digest), context);
  } else {
    php_hash_hmac_round((unsigned char *) ZSTR_VAL(digest), ops, context, K, (unsigned char *) data, data_len);
  }

  php_hash_string_xor_char(K, K, 0x6A, ops->block_size);

  php_hash_hmac_round((unsigned char *) ZSTR_VAL(digest), ops, context, K, (unsigned char *) ZSTR_VAL(digest), ops->digest_size);

  /* Zero the key */
  ZEND_SECURE_ZERO(K, ops->block_size);
  efree(K);
  php_hash_free_context(ops, context);

  if (raw_output) {
    ZSTR_VAL(digest)[ops->digest_size] = 0;
    RETURN_NEW_STR(digest);
  } else {
    zend_string *hex_digest = zend_string_safe_alloc(ops->digest_size, 2, 0, 0);

    zend_bin2hex(ZSTR_VAL(hex_digest), (unsigned char *) ZSTR_VAL(digest), ops->digest_size);
    ZSTR_VAL(hex_digest)[2 * ops->digest_size] = 0;
    zend_string_efree(digest);
    RETURN_NEW_STR(hex_digest);
  }
}
/* }}} */

/* {{{ Generate a hash of a given input string with a key using HMAC
Returns lowercase hexits by default */
PHP_FUNCTION(hash_hmac)
{
  zend_string *algo;
  char *data, *key;
  size_t data_len, key_len;
  bool raw_output = false;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "Sss|b", &algo, &data, &data_len, &key, &key_len, &raw_output) == FAILURE) {
    RETURN_THROWS();
  }

  php_hash_do_hash_hmac(return_value, algo, data, data_len, key, key_len, raw_output, false);
}
/* }}} */

/* {{{ Generate a hash of a given file with a key using HMAC
Returns lowercase hexits by default */
PHP_FUNCTION(hash_hmac_file)
{
  zend_string *algo;
  char *data, *key;
  size_t data_len, key_len;
  bool raw_output = false;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "Sss|b", &algo, &data, &data_len, &key, &key_len, &raw_output) == FAILURE) {
    RETURN_THROWS();
  }

  php_hash_do_hash_hmac(return_value, algo, data, data_len, key, key_len, raw_output, true);
}
/* }}} */

/* {{{ Initialize a hashing context */
PHP_FUNCTION(hash_init)
{
  zend_string *algo, *key = NULL;
  zend_long options = 0;
  void *context;
  const php_hash_ops *ops;
  php_hashcontext_object *hash;
  HashTable *args = NULL;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "S|lSh", &algo, &options, &key, &args) == FAILURE) {
    RETURN_THROWS();
  }

  ops = php_hash_fetch_ops(algo);
  if (!ops) {
    zend_argument_value_error(1, "must be a valid hashing algorithm");
    RETURN_THROWS();
  }

  if (options & PHP_HASH_HMAC) {
    if (!ops->is_crypto) {
      zend_argument_value_error(1, "must be a cryptographic hashing algorithm if HMAC is requested");
      RETURN_THROWS();
    }
    if (!key || (ZSTR_LEN(key) == 0)) {
      /* Note: a zero length key is no key at all */
      zend_argument_value_error(3, "must not be empty when HMAC is requested");
      RETURN_THROWS();
    }
  }

  object_init_ex(return_value, php_hashcontext_ce);
  hash = php_hashcontext_from_object(Z_OBJ_P(return_value));

  context = php_hash_alloc_context(ops);
  ops->hash_init(context, args);

  hash->ops = ops;
  hash->context = context;
  hash->options = options;
  hash->key = NULL;

  if (options & PHP_HASH_HMAC) {
    char *K = emalloc(ops->block_size);
    size_t i, block_size;

    memset(K, 0, ops->block_size);

    if (ZSTR_LEN(key) > ops->block_size) {
      /* Reduce the key first */
      ops->hash_update(context, (unsigned char *) ZSTR_VAL(key), ZSTR_LEN(key));
      ops->hash_final((unsigned char *) K, context);
      /* Make the context ready to start over */
      ops->hash_init(context, args);
    } else {
      memcpy(K, ZSTR_VAL(key), ZSTR_LEN(key));
    }

    /* XOR ipad */
    block_size = ops->block_size;
    for(i = 0; i < block_size; i++) {
      K[i] ^= 0x36;
    }
    ops->hash_update(context, (unsigned char *) K, ops->block_size);
    hash->key = (unsigned char *) K;
  }
}
/* }}} */

#define PHP_HASHCONTEXT_VERIFY(hash) { \
  if (!hash->context) { \
    zend_argument_type_error(1, "must be a valid, non-finalized HashContext"); \
    RETURN_THROWS(); \
  } \
}

/* {{{ Pump data into the hashing algorithm */
PHP_FUNCTION(hash_update)
{
  zval *zhash;
  php_hashcontext_object *hash;
  zend_string *data;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "OS", &zhash, php_hashcontext_ce, &data) == FAILURE) {
    RETURN_THROWS();
  }

  hash = php_hashcontext_from_object(Z_OBJ_P(zhash));
  PHP_HASHCONTEXT_VERIFY(hash);
  hash->ops->hash_update(hash->context, (unsigned char *) ZSTR_VAL(data), ZSTR_LEN(data));

  RETURN_TRUE;
}
/* }}} */

/* {{{ Pump data into the hashing algorithm from an open stream */
PHP_FUNCTION(hash_update_stream)
{
  zend_object *hash_obj;
  php_hashcontext_object *hash;
  php_stream *stream = NULL;
  zend_long length = -1, didread = 0;

  ZEND_PARSE_PARAMETERS_START(2, 3)
    Z_PARAM_OBJ_OF_CLASS(hash_obj, php_hashcontext_ce)
    PHP_Z_PARAM_STREAM(stream)
    Z_PARAM_OPTIONAL
    Z_PARAM_LONG(length)
  ZEND_PARSE_PARAMETERS_END();

  hash = php_hashcontext_from_object(hash_obj);
  PHP_HASHCONTEXT_VERIFY(hash);

  while (length) {
    char buf[1024];
    zend_long toread = 1024;
    ssize_t n;

    if (length > 0 && toread > length) {
      toread = length;
    }

    if ((n = php_stream_read(stream, buf, toread)) <= 0) {
      RETURN_LONG(didread);
    }
    hash->ops->hash_update(hash->context, (unsigned char *) buf, n);
    length -= n;
    didread += n;
  }

  RETURN_LONG(didread);
}
/* }}} */

/* {{{ Pump data into the hashing algorithm from a file */
PHP_FUNCTION(hash_update_file)
{
  zval *zhash, *zcontext = NULL;
  php_hashcontext_object *hash;
  php_stream_context *context = NULL;
  php_stream *stream;
  zend_string *filename;
  char buf[1024];
  ssize_t n;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "OP|r!", &zhash, php_hashcontext_ce, &filename, &zcontext) == FAILURE) {
    RETURN_THROWS();
  }

  hash = php_hashcontext_from_object(Z_OBJ_P(zhash));
  PHP_HASHCONTEXT_VERIFY(hash);
  context = php_stream_context_from_zval(zcontext, 0);

  stream = php_stream_open_wrapper_ex(ZSTR_VAL(filename), "rb", REPORT_ERRORS, NULL, context);
  if (!stream) {
    /* Stream will report errors opening file */
    RETURN_FALSE;
  }

  while ((n = php_stream_read(stream, buf, sizeof(buf))) > 0) {
    hash->ops->hash_update(hash->context, (unsigned char *) buf, n);
  }
  php_stream_close(stream);

  RETURN_BOOL(n >= 0);
}
/* }}} */

/* {{{ Output resulting digest */
PHP_FUNCTION(hash_final)
{
  zval *zhash;
  php_hashcontext_object *hash;
  bool raw_output = false;
  zend_string *digest;
  size_t digest_len;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "O|b", &zhash, php_hashcontext_ce, &raw_output) == FAILURE) {
    RETURN_THROWS();
  }

  hash = php_hashcontext_from_object(Z_OBJ_P(zhash));
  PHP_HASHCONTEXT_VERIFY(hash);

  digest_len = hash->ops->digest_size;
  digest = zend_string_alloc(digest_len, 0);
  hash->ops->hash_final((unsigned char *) ZSTR_VAL(digest), hash->context);
  if (hash->options & PHP_HASH_HMAC) {
    size_t i, block_size;

    /* Convert K to opad -- 0x6A = 0x36 ^ 0x5C */
    block_size = hash->ops->block_size;
    for(i = 0; i < block_size; i++) {
      hash->key[i] ^= 0x6A;
    }

    /* Feed this result into the outer hash */
    hash->ops->hash_init(hash->context, NULL);
    hash->ops->hash_update(hash->context, hash->key, hash->ops->block_size);
    hash->ops->hash_update(hash->context, (unsigned char *) ZSTR_VAL(digest), hash->ops->digest_size);
    hash->ops->hash_final((unsigned char *) ZSTR_VAL(digest), hash->context);

    /* Zero the key */
    ZEND_SECURE_ZERO(hash->key, hash->ops->block_size);
    efree(hash->key);
    hash->key = NULL;
  }
  ZSTR_VAL(digest)[digest_len] = 0;

  /* Invalidate the object from further use */
  php_hash_free_context(hash->ops, hash->context);
  hash->context = NULL;

  if (raw_output) {
    RETURN_NEW_STR(digest);
  } else {
    zend_string *hex_digest = zend_string_safe_alloc(digest_len, 2, 0, 0);

    zend_bin2hex(ZSTR_VAL(hex_digest), (unsigned char *) ZSTR_VAL(digest), digest_len);
    ZSTR_VAL(hex_digest)[2 * digest_len] = 0;
    zend_string_efree(digest);
    RETURN_NEW_STR(hex_digest);
  }
}
/* }}} */

/* {{{ Copy hash object */
PHP_FUNCTION(hash_copy)
{
  zval *zhash;
  php_hashcontext_object *context;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "O", &zhash, php_hashcontext_ce) == FAILURE) {
    RETURN_THROWS();
  }

  context = php_hashcontext_from_object(Z_OBJ_P(zhash));
  PHP_HASHCONTEXT_VERIFY(context);

  RETVAL_OBJ(Z_OBJ_HANDLER_P(zhash, clone_obj)(Z_OBJ_P(zhash)));

  if (php_hashcontext_from_object(Z_OBJ_P(return_value))->context == NULL) {
    zend_throw_error(NULL, "Cannot copy hash");
    RETURN_THROWS();
  }
}
/* }}} */

/* {{{ Return a list of registered hashing algorithms */
PHP_FUNCTION(hash_algos)
{
  zend_string *str;

  ZEND_PARSE_PARAMETERS_NONE();

  array_init(return_value);
  ZEND_HASH_MAP_FOREACH_STR_KEY(&php_hash_hashtable, str) {
    add_next_index_str(return_value, zend_string_copy(str));
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

/* {{{ Return a list of registered hashing algorithms suitable for hash_hmac() */
PHP_FUNCTION(hash_hmac_algos)
{
  zend_string *str;
  const php_hash_ops *ops;

  ZEND_PARSE_PARAMETERS_NONE();

  array_init(return_value);
  ZEND_HASH_MAP_FOREACH_STR_KEY_PTR(&php_hash_hashtable, str, ops) {
    if (ops->is_crypto) {
      add_next_index_str(return_value, zend_string_copy(str));
    }
  } ZEND_HASH_FOREACH_END();
}
/* }}} */

/* {{{ RFC5869 HMAC-based key derivation function */
PHP_FUNCTION(hash_hkdf)
{
  zend_string *returnval, *ikm, *algo, *info = NULL, *salt = NULL;
  zend_long length = 0;
  unsigned char *prk, *digest, *K;
  size_t i;
  size_t rounds;
  const php_hash_ops *ops;
  void *context;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "SS|lSS", &algo, &ikm, &length, &info, &salt) == FAILURE) {
    RETURN_THROWS();
  }

  ops = php_hash_fetch_ops(algo);
  if (!ops || !ops->is_crypto) {
    zend_argument_value_error(1, "must be a valid cryptographic hashing algorithm");
    RETURN_THROWS();
  }

  if (ZSTR_LEN(ikm) == 0) {
    zend_argument_must_not_be_empty_error(2);
    RETURN_THROWS();
  }

  if (length < 0) {
    zend_argument_value_error(3, "must be greater than or equal to 0");
    RETURN_THROWS();
  } else if (length == 0) {
    length = ops->digest_size;
  } else if (length > (zend_long) (ops->digest_size * 255)) {
    zend_argument_value_error(3, "must be less than or equal to %zd", ops->digest_size * 255);
    RETURN_THROWS();
  }

  context = php_hash_alloc_context(ops);

  // Extract
  ops->hash_init(context, NULL);
  K = emalloc(ops->block_size);
  php_hash_hmac_prep_key(K, ops, context,
    (unsigned char *) (salt ? ZSTR_VAL(salt) : ""), salt ? ZSTR_LEN(salt) : 0);

  prk = emalloc(ops->digest_size);
  php_hash_hmac_round(prk, ops, context, K, (unsigned char *) ZSTR_VAL(ikm), ZSTR_LEN(ikm));
  php_hash_string_xor_char(K, K, 0x6A, ops->block_size);
  php_hash_hmac_round(prk, ops, context, K, prk, ops->digest_size);
  ZEND_SECURE_ZERO(K, ops->block_size);

  // Expand
  returnval = zend_string_alloc(length, 0);
  digest = emalloc(ops->digest_size);
  for (i = 1, rounds = (length - 1) / ops->digest_size + 1; i <= rounds; i++) {
    // chr(i)
    unsigned char c[1];
    c[0] = (i & 0xFF);

    php_hash_hmac_prep_key(K, ops, context, prk, ops->digest_size);
    ops->hash_init(context, NULL);
    ops->hash_update(context, K, ops->block_size);

    if (i > 1) {
      ops->hash_update(context, digest, ops->digest_size);
    }

    if (info != NULL && ZSTR_LEN(info) > 0) {
      ops->hash_update(context, (unsigned char *) ZSTR_VAL(info), ZSTR_LEN(info));
    }

    ops->hash_update(context, c, 1);
    ops->hash_final(digest, context);
    php_hash_string_xor_char(K, K, 0x6A, ops->block_size);
    php_hash_hmac_round(digest, ops, context, K, digest, ops->digest_size);
    memcpy(
      ZSTR_VAL(returnval) + ((i - 1) * ops->digest_size),
      digest,
      (i == rounds ? length - ((i - 1) * ops->digest_size) : ops->digest_size)
    );
  }

  ZEND_SECURE_ZERO(K, ops->block_size);
  ZEND_SECURE_ZERO(digest, ops->digest_size);
  ZEND_SECURE_ZERO(prk, ops->digest_size);
  efree(K);
  php_hash_free_context(ops, context);
  efree(prk);
  efree(digest);
  ZSTR_VAL(returnval)[length] = 0;
  RETURN_STR(returnval);
}

/* {{{ Generate a PBKDF2 hash of the given password and salt
Returns lowercase hexits by default */
PHP_FUNCTION(hash_pbkdf2)
{
  zend_string *returnval, *algo;
  char *salt, *pass = NULL;
  unsigned char *computed_salt, *digest, *temp, *result, *K1, *K2 = NULL;
  zend_long loops, i, j, iterations, digest_length = 0, length = 0;
  size_t pass_len, salt_len = 0;
  bool raw_output = false;
  const php_hash_ops *ops;
  void *context;
  HashTable *args = NULL;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "Sssl|lbh", &algo, &pass, &pass_len, &salt, &salt_len, &iterations, &length, &raw_output, &args) == FAILURE) {
    RETURN_THROWS();
  }

  ops = php_hash_fetch_ops(algo);
  if (!ops || !ops->is_crypto) {
    zend_argument_value_error(1, "must be a valid cryptographic hashing algorithm");
    RETURN_THROWS();
  }

  if (salt_len > INT_MAX - 4) {
    zend_argument_value_error(3, "must be less than or equal to INT_MAX - 4 bytes");
    RETURN_THROWS();
  }

  if (iterations <= 0) {
    zend_argument_value_error(4, "must be greater than 0");
    RETURN_THROWS();
  }

  if (length < 0) {
    zend_argument_value_error(5, "must be greater than or equal to 0");
    RETURN_THROWS();
  }

  context = php_hash_alloc_context(ops);
  ops->hash_init(context, args);

  K1 = emalloc(ops->block_size);
  K2 = emalloc(ops->block_size);
  digest = emalloc(ops->digest_size);
  temp = emalloc(ops->digest_size);

  /* Setup Keys that will be used for all hmac rounds */
  php_hash_hmac_prep_key(K1, ops, context, (unsigned char *) pass, pass_len);
  /* Convert K1 to opad -- 0x6A = 0x36 ^ 0x5C */
  php_hash_string_xor_char(K2, K1, 0x6A, ops->block_size);

  /* Setup Main Loop to build a long enough result */
  if (length == 0) {
    length = ops->digest_size;
    if (!raw_output) {
      length = length * 2;
    }
  }
  digest_length = length;
  if (!raw_output) {
    digest_length = length / 2 + (length % 2);
  }

  loops = (digest_length - 1) / ops->digest_size + 1;

  result = safe_emalloc(loops, ops->digest_size, 0);

  computed_salt = safe_emalloc(salt_len, 1, 4);
  memcpy(computed_salt, (unsigned char *) salt, salt_len);

  for (i = 1; i <= loops; i++) {
    /* digest = hash_hmac(salt + pack('N', i), password) { */

    /* pack("N", i) */
    computed_salt[salt_len] = (unsigned char) (i >> 24);
    computed_salt[salt_len + 1] = (unsigned char) ((i & 0xFF0000) >> 16);
    computed_salt[salt_len + 2] = (unsigned char) ((i & 0xFF00) >> 8);
    computed_salt[salt_len + 3] = (unsigned char) (i & 0xFF);

    php_hash_hmac_round(digest, ops, context, K1, computed_salt, (zend_long) salt_len + 4);
    php_hash_hmac_round(digest, ops, context, K2, digest, ops->digest_size);
    /* } */

    /* temp = digest */
    memcpy(temp, digest, ops->digest_size);

    /*
     * Note that the loop starting at 1 is intentional, since we've already done
     * the first round of the algorithm.
     */
    for (j = 1; j < iterations; j++) {
      /* digest = hash_hmac(digest, password) { */
      php_hash_hmac_round(digest, ops, context, K1, digest, ops->digest_size);
      php_hash_hmac_round(digest, ops, context, K2, digest, ops->digest_size);
      /* } */
      /* temp ^= digest */
      php_hash_string_xor(temp, temp, digest, ops->digest_size);
    }
    /* result += temp */
    memcpy(result + ((i - 1) * ops->digest_size), temp, ops->digest_size);
  }
  /* Zero potentially sensitive variables */
  ZEND_SECURE_ZERO(K1, ops->block_size);
  ZEND_SECURE_ZERO(K2, ops->block_size);
  ZEND_SECURE_ZERO(computed_salt, salt_len + 4);
  efree(K1);
  efree(K2);
  efree(computed_salt);
  php_hash_free_context(ops, context);
  efree(digest);
  efree(temp);

  returnval = zend_string_alloc(length, 0);
  if (raw_output) {
    memcpy(ZSTR_VAL(returnval), result, length);
  } else {
    zend_bin2hex(ZSTR_VAL(returnval), result, digest_length);
  }
  ZSTR_VAL(returnval)[length] = 0;
  efree(result);
  RETURN_NEW_STR(returnval);
}
/* }}} */

/* {{{ Compares two strings using the same time whether they're equal or not.
   A difference in length will leak */
PHP_FUNCTION(hash_equals)
{
  zval *known_zval, *user_zval;
  int result = 0;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "zz", &known_zval, &user_zval) == FAILURE) {
    RETURN_THROWS();
  }

  /* We only allow comparing string to prevent unexpected results. */
  if (Z_TYPE_P(known_zval) != IS_STRING) {
    zend_wrong_parameter_type_error(1, Z_EXPECTED_STRING, known_zval);
    RETURN_THROWS();
  }

  if (Z_TYPE_P(user_zval) != IS_STRING) {
    zend_wrong_parameter_type_error(2, Z_EXPECTED_STRING, user_zval);
    RETURN_THROWS();
  }

  /* This is security sensitive code. Do not optimize this for speed. */
  result = php_safe_bcmp(Z_STR_P(known_zval), Z_STR_P(user_zval));

  RETURN_BOOL(0 == result);
}
/* }}} */

/* {{{ */
PHP_METHOD(HashContext, __construct) {
  /* Normally unreachable as private/final */
  zend_throw_exception(zend_ce_error, "Illegal call to private/final constructor", 0);
}
/* }}} */

/* Module Housekeeping */

#define PHP_HASH_HAVAL_REGISTER(p,b)  php_hash_register_algo("haval" #b "," #p , &php_hash_##p##haval##b##_ops);

#ifdef PHP_MHASH_BC

#if 0
/* See #69823, we should not insert module into module_registry while doing startup */

PHP_MINFO_FUNCTION(mhash)
{
  php_info_print_table_start();
  php_info_print_table_row(2, "MHASH support", "Enabled");
  php_info_print_table_row(2, "MHASH API Version", "Emulated Support");
  php_info_print_table_end();
}

zend_module_entry mhash_module_entry = {
  STANDARD_MODULE_HEADER,
  "mhash",
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  PHP_MINFO(mhash),
  PHP_MHASH_VERSION,
  STANDARD_MODULE_PROPERTIES,
};
#endif

static void mhash_init(INIT_FUNC_ARGS)
{
  char buf[128];
  int len;
  int algo_number = 0;

  zend_string *deprecation_reason = zend_string_init("as the mhash*() functions were deprecated", strlen("as the mhash*() functions were deprecated"), 1);
  for (algo_number = 0; algo_number < MHASH_NUM_ALGOS; algo_number++) {
    struct mhash_bc_entry algorithm = mhash_to_hash[algo_number];
    if (algorithm.mhash_name == NULL) {
      continue;
    }

    len = slprintf(buf, 127, "MHASH_%s", algorithm.mhash_name);
    zend_constant *mhash_const = zend_register_long_constant(buf, len, algorithm.value, CONST_PERSISTENT|CONST_DEPRECATED, module_number);

    zend_attribute *deprecation_attrib = zend_add_global_constant_attribute(mhash_const, ZSTR_KNOWN(ZEND_STR_DEPRECATED_CAPITALIZED), 2);
    ZVAL_STR(&deprecation_attrib->args[0].value, ZSTR_KNOWN(ZEND_STR_8_DOT_5));
    deprecation_attrib->args[0].name = ZSTR_KNOWN(ZEND_STR_SINCE);
    ZVAL_STR_COPY(&deprecation_attrib->args[1].value, deprecation_reason);
    deprecation_attrib->args[1].name = ZSTR_KNOWN(ZEND_STR_MESSAGE);
  }
  /* Each of the attributes uses ZVAL_STR_COPY instead of trying to special
   * case one of them to use ZVAL_STR, but that means there is one more
   * reference that needs to be decremented. */
  zend_string_release(deprecation_reason);

  /* TODO: this cause #69823 zend_register_internal_module(&mhash_module_entry); */
}

/* {{{ Hash data with hash */
PHP_FUNCTION(mhash)
{
  zend_long algorithm;
  zend_string *algo = NULL;
  char *data, *key = NULL;
  size_t data_len, key_len = 0;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "ls|s!", &algorithm, &data, &data_len, &key, &key_len) == FAILURE) {
    RETURN_THROWS();
  }

  /* need to convert the first parameter from int constant to string algorithm name */
  if (algorithm >= 0 && algorithm < MHASH_NUM_ALGOS) {
    struct mhash_bc_entry algorithm_lookup = mhash_to_hash[algorithm];
    if (algorithm_lookup.hash_name) {
      algo = zend_string_init(algorithm_lookup.hash_name, strlen(algorithm_lookup.hash_name), 0);
    } else {
      RETURN_FALSE;
    }
  } else {
    RETURN_FALSE;
  }

  if (key) {
    php_hash_do_hash_hmac(return_value, algo, data, data_len, key, key_len, true, false);
  } else {
    php_hash_do_hash(return_value, algo, data, data_len, true, false, NULL);
  }

  if (algo) {
    zend_string_release(algo);
  }
}
/* }}} */

/* {{{ Gets the name of hash */
PHP_FUNCTION(mhash_get_hash_name)
{
  zend_long algorithm;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &algorithm) == FAILURE) {
    RETURN_THROWS();
  }

  if (algorithm >= 0 && algorithm  < MHASH_NUM_ALGOS) {
    struct mhash_bc_entry algorithm_lookup = mhash_to_hash[algorithm];
    if (algorithm_lookup.mhash_name) {
      RETURN_STRING(algorithm_lookup.mhash_name);
    }
  }
  RETURN_FALSE;
}
/* }}} */

/* {{{ Gets the number of available hashes */
PHP_FUNCTION(mhash_count)
{
  ZEND_PARSE_PARAMETERS_NONE();
  RETURN_LONG(MHASH_NUM_ALGOS - 1);
}
/* }}} */

/* {{{ Gets the block size of hash */
PHP_FUNCTION(mhash_get_block_size)
{
  zend_long algorithm;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &algorithm) == FAILURE) {
    RETURN_THROWS();
  }
  RETVAL_FALSE;

  if (algorithm >= 0 && algorithm  < MHASH_NUM_ALGOS) {
    struct mhash_bc_entry algorithm_lookup = mhash_to_hash[algorithm];
    if (algorithm_lookup.mhash_name) {
      const php_hash_ops *ops = zend_hash_str_find_ptr(&php_hash_hashtable, algorithm_lookup.hash_name, strlen(algorithm_lookup.hash_name));
      if (ops) {
        RETVAL_LONG(ops->digest_size);
      }
    }
  }
}
/* }}} */

#define SALT_SIZE 8

/* {{{ Generates a key using hash functions */
PHP_FUNCTION(mhash_keygen_s2k)
{
  zend_long algorithm, l_bytes;
  int bytes;
  char *password, *salt;
  size_t password_len, salt_len;
  char padded_salt[SALT_SIZE];

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "lssl", &algorithm, &password, &password_len, &salt, &salt_len, &l_bytes) == FAILURE) {
    RETURN_THROWS();
  }

  bytes = (int)l_bytes;
  if (bytes <= 0){
    zend_argument_value_error(4, "must be a greater than 0");
    RETURN_THROWS();
  }

  salt_len = MIN(salt_len, SALT_SIZE);

  memcpy(padded_salt, salt, salt_len);
  if (salt_len < SALT_SIZE) {
    memset(padded_salt + salt_len, 0, SALT_SIZE - salt_len);
  }
  salt_len = SALT_SIZE;

  RETVAL_FALSE;
  if (algorithm >= 0 && algorithm < MHASH_NUM_ALGOS) {
    struct mhash_bc_entry algorithm_lookup = mhash_to_hash[algorithm];
    if (algorithm_lookup.mhash_name) {
      const php_hash_ops *ops = zend_hash_str_find_ptr(&php_hash_hashtable, algorithm_lookup.hash_name, strlen(algorithm_lookup.hash_name));
      if (ops) {
        unsigned char null = '\0';
        void *context;
        char *key, *digest;
        int i = 0, j = 0;
        size_t block_size = ops->digest_size;
        size_t times = bytes / block_size;

        if ((bytes % block_size) != 0) {
          times++;
        }

        context = php_hash_alloc_context(ops);
        ops->hash_init(context, NULL);

        key = ecalloc(1, times * block_size);
        digest = emalloc(ops->digest_size + 1);

        for (i = 0; i < times; i++) {
          ops->hash_init(context, NULL);

          for (j=0;j<i;j++) {
            ops->hash_update(context, &null, 1);
          }
          ops->hash_update(context, (unsigned char *)padded_salt, salt_len);
          ops->hash_update(context, (unsigned char *)password, password_len);
          ops->hash_final((unsigned char *)digest, context);
          memcpy( &key[i*block_size], digest, block_size);
        }

        RETVAL_STRINGL(key, bytes);
        ZEND_SECURE_ZERO(key, bytes);
        efree(digest);
        php_hash_free_context(ops, context);
        efree(key);
      }
    }
  }
}
/* }}} */

#endif

/* ----------------------------------------------------------------------- */

/* {{{ php_hashcontext_create */
static zend_object* php_hashcontext_create(zend_class_entry *ce) {
  php_hashcontext_object *objval = zend_object_alloc(sizeof(php_hashcontext_object), ce);
  zend_object *zobj = &objval->std;

  zend_object_std_init(zobj, ce);
  object_properties_init(zobj, ce);
  zobj->handlers = &php_hashcontext_handlers;

  return zobj;
}
/* }}} */

/* {{{ php_hashcontext_dtor */
static void php_hashcontext_dtor(zend_object *obj) {
  php_hashcontext_object *hash = php_hashcontext_from_object(obj);

  if (hash->context) {
    php_hash_free_context(hash->ops, hash->context);
    hash->context = NULL;
  }

  if (hash->key) {
    ZEND_SECURE_ZERO(hash->key, hash->ops->block_size);
    efree(hash->key);
    hash->key = NULL;
  }
}
/* }}} */

static void php_hashcontext_free(zend_object *obj) {
  php_hashcontext_dtor(obj);
  zend_object_std_dtor(obj);
}

/* {{{ php_hashcontext_clone */
static zend_object *php_hashcontext_clone(zend_object *zobj) {
  const php_hashcontext_object *oldobj = php_hashcontext_from_object(zobj);
  zend_object *znew = php_hashcontext_create(zobj->ce);
  php_hashcontext_object *newobj = php_hashcontext_from_object(znew);

  if (!oldobj->context) {
    zend_throw_exception(zend_ce_value_error, "Cannot clone a finalized HashContext", 0);
    return znew;
  }

  zend_objects_clone_members(znew, zobj);

  newobj->ops = oldobj->ops;
  newobj->options = oldobj->options;
  newobj->context = php_hash_alloc_context(newobj->ops);
  newobj->ops->hash_init(newobj->context, NULL);

  if (SUCCESS != newobj->ops->hash_copy(newobj->ops, oldobj->context, newobj->context)) {
    php_hash_free_context(newobj->ops, newobj->context);
    newobj->context = NULL;
    return znew;
  }

  newobj->key = ecalloc(1, newobj->ops->block_size);
  if (oldobj->key) {
    memcpy(newobj->key, oldobj->key, newobj->ops->block_size);
  }

  return znew;
}
/* }}} */

/* Serialization format: 5-element array
   Index 0: hash algorithm (string)
   Index 1: options (long, 0)
   Index 2: hash-determined serialization of context state (usually array)
   Index 3: magic number defining layout of context state (long, usually 2)
   Index 4: properties (array)

   HashContext serializations are not necessarily portable between architectures or
   PHP versions. If the format of a serialized hash context changes, that should
   be reflected in either a different value of `magic` or a different format of
   the serialized context state. Most context states are unparsed and parsed using
   a spec string, such as "llb128.", using the format defined by
   `php_hash_serialize_spec`/`php_hash_unserialize_spec`. Some hash algorithms must
   also check the unserialized state for validity, to ensure that using an
   unserialized context is safe from memory errors.

   Currently HASH_HMAC contexts cannot be serialized, because serializing them
   would require serializing the HMAC key in plaintext. */

/* {{{ Serialize the object */
PHP_METHOD(HashContext, __serialize)
{
  zval *object = ZEND_THIS;
  php_hashcontext_object *hash = php_hashcontext_from_object(Z_OBJ_P(object));
  zend_long magic = 0;
  zval tmp;

  ZEND_PARSE_PARAMETERS_NONE();

  array_init(return_value);

  if (!hash->ops->hash_serialize) {
    goto serialize_failure;
  } else if (hash->options & PHP_HASH_HMAC) {
    zend_throw_exception(NULL, "HashContext with HASH_HMAC option cannot be serialized", 0);
    RETURN_THROWS();
  }

  ZVAL_STRING(&tmp, hash->ops->algo);
  zend_hash_next_index_insert(Z_ARRVAL_P(return_value), &tmp);

  ZVAL_LONG(&tmp, hash->options);
  zend_hash_next_index_insert(Z_ARRVAL_P(return_value), &tmp);

  if (hash->ops->hash_serialize(hash, &magic, &tmp) != HASH_SPEC_SUCCESS) {
    goto serialize_failure;
  }
  zend_hash_next_index_insert(Z_ARRVAL_P(return_value), &tmp);

  ZVAL_LONG(&tmp, magic);
  zend_hash_next_index_insert(Z_ARRVAL_P(return_value), &tmp);

  /* members */
  ZVAL_ARR(&tmp, zend_std_get_properties(&hash->std));
  Z_TRY_ADDREF(tmp);
  zend_hash_next_index_insert(Z_ARRVAL_P(return_value), &tmp);

  return;

serialize_failure:
  zend_throw_exception_ex(NULL, 0, "HashContext for algorithm \"%s\" cannot be serialized", hash->ops->algo);
  RETURN_THROWS();
}
/* }}} */

/* {{{ unserialize the object */
PHP_METHOD(HashContext, __unserialize)
{
  zval *object = ZEND_THIS;
  php_hashcontext_object *hash = php_hashcontext_from_object(Z_OBJ_P(object));
  HashTable *data;
  zval *algo_zv, *magic_zv, *options_zv, *hash_zv, *members_zv;
  zend_long magic, options;
  hash_spec_result unserialize_result;
  const php_hash_ops *ops;

  if (zend_parse_parameters(ZEND_NUM_ARGS(), "h", &data) == FAILURE) {
    RETURN_THROWS();
  }

  if (hash->context) {
    zend_throw_exception(NULL, "HashContext::__unserialize called on initialized object", 0);
    RETURN_THROWS();
  }

  algo_zv = zend_hash_index_find(data, 0);
  options_zv = zend_hash_index_find(data, 1);
  hash_zv = zend_hash_index_find(data, 2);
  magic_zv = zend_hash_index_find(data, 3);
  members_zv = zend_hash_index_find(data, 4);

  if (!algo_zv || Z_TYPE_P(algo_zv) != IS_STRING
    || !magic_zv || Z_TYPE_P(magic_zv) != IS_LONG
    || !options_zv || Z_TYPE_P(options_zv) != IS_LONG
    || !hash_zv
    || !members_zv || Z_TYPE_P(members_zv) != IS_ARRAY) {
    zend_throw_exception(NULL, "Incomplete or ill-formed serialization data", 0);
    RETURN_THROWS();
  }

  magic = Z_LVAL_P(magic_zv);
  options = Z_LVAL_P(options_zv);
  if (options & PHP_HASH_HMAC) {
    zend_throw_exception(NULL, "HashContext with HASH_HMAC option cannot be serialized", 0);
    RETURN_THROWS();
  }

  ops = php_hash_fetch_ops(Z_STR_P(algo_zv));
  if (!ops) {
    zend_throw_exception(NULL, "Unknown hash algorithm", 0);
    RETURN_THROWS();
  } else if (!ops->hash_unserialize) {
    zend_throw_exception_ex(NULL, 0, "Hash algorithm \"%s\" cannot be unserialized", ops->algo);
    RETURN_THROWS();
  }

  hash->ops = ops;
  hash->context = php_hash_alloc_context(ops);
  hash->options = options;
  ops->hash_init(hash->context, NULL);

  unserialize_result = ops->hash_unserialize(hash, magic, hash_zv);
  if (unserialize_result != HASH_SPEC_SUCCESS) {
    zend_throw_exception_ex(NULL, 0, "Incomplete or ill-formed serialization data (\"%s\" code %d)", ops->algo, unserialize_result);
    /* free context */
    php_hashcontext_dtor(Z_OBJ_P(object));
    RETURN_THROWS();
  }

  object_properties_load(&hash->std, Z_ARRVAL_P(members_zv));
}
/* }}} */

ZEND_METHOD(HashContext, __debugInfo)
{
  zval *object = ZEND_THIS;
  php_hashcontext_object *hash = php_hashcontext_from_object(Z_OBJ_P(object));

  ZEND_PARSE_PARAMETERS_NONE();

  zval tmp;

  array_init(return_value);

  ZVAL_STRING(&tmp, hash->ops->algo);
  zend_hash_str_update(Z_ARR_P(return_value), "algo", strlen("algo"), &tmp);
}

/* {{{ PHP_MINIT_FUNCTION */
PHP_MINIT_FUNCTION(hash)
{
  zend_hash_init(&php_hash_hashtable, 35, NULL, NULL, 1);

  php_hash_register_algo("md2",     &php_hash_md2_ops);
  php_hash_register_algo("md4",     &php_hash_md4_ops);
  php_hash_register_algo("md5",     &php_hash_md5_ops);
  php_hash_register_algo("sha1",      &php_hash_sha1_ops);
  php_hash_register_algo("sha224",    &php_hash_sha224_ops);
  php_hash_register_algo("sha256",    &php_hash_sha256_ops);
  php_hash_register_algo("sha384",    &php_hash_sha384_ops);
  php_hash_register_algo("sha512/224",            &php_hash_sha512_224_ops);
  php_hash_register_algo("sha512/256",            &php_hash_sha512_256_ops);
  php_hash_register_algo("sha512",    &php_hash_sha512_ops);
  php_hash_register_algo("sha3-224",    &php_hash_sha3_224_ops);
  php_hash_register_algo("sha3-256",    &php_hash_sha3_256_ops);
  php_hash_register_algo("sha3-384",    &php_hash_sha3_384_ops);
  php_hash_register_algo("sha3-512",    &php_hash_sha3_512_ops);
  php_hash_register_algo("ripemd128",   &php_hash_ripemd128_ops);
  php_hash_register_algo("ripemd160",   &php_hash_ripemd160_ops);
  php_hash_register_algo("ripemd256",   &php_hash_ripemd256_ops);
  php_hash_register_algo("ripemd320",   &php_hash_ripemd320_ops);
  php_hash_register_algo("whirlpool",   &php_hash_whirlpool_ops);
  php_hash_register_algo("tiger128,3",  &php_hash_3tiger128_ops);
  php_hash_register_algo("tiger160,3",  &php_hash_3tiger160_ops);
  php_hash_register_algo("tiger192,3",  &php_hash_3tiger192_ops);
  php_hash_register_algo("tiger128,4",  &php_hash_4tiger128_ops);
  php_hash_register_algo("tiger160,4",  &php_hash_4tiger160_ops);
  php_hash_register_algo("tiger192,4",  &php_hash_4tiger192_ops);
  php_hash_register_algo("snefru",    &php_hash_snefru_ops);
  php_hash_register_algo("snefru256",   &php_hash_snefru_ops);
  php_hash_register_algo("gost",      &php_hash_gost_ops);
  php_hash_register_algo("gost-crypto",   &php_hash_gost_crypto_ops);
  php_hash_register_algo("adler32",   &php_hash_adler32_ops);
  php_hash_register_algo("crc32",     &php_hash_crc32_ops);
  php_hash_register_algo("crc32b",    &php_hash_crc32b_ops);
  php_hash_register_algo("crc32c",    &php_hash_crc32c_ops);
  php_hash_register_algo("fnv132",    &php_hash_fnv132_ops);
  php_hash_register_algo("fnv1a32",   &php_hash_fnv1a32_ops);
  php_hash_register_algo("fnv164",    &php_hash_fnv164_ops);
  php_hash_register_algo("fnv1a64",   &php_hash_fnv1a64_ops);
  php_hash_register_algo("joaat",     &php_hash_joaat_ops);
  php_hash_register_algo("murmur3a",    &php_hash_murmur3a_ops);
  php_hash_register_algo("murmur3c",    &php_hash_murmur3c_ops);
  php_hash_register_algo("murmur3f",    &php_hash_murmur3f_ops);
  php_hash_register_algo("xxh32",   &php_hash_xxh32_ops);
  php_hash_register_algo("xxh64",   &php_hash_xxh64_ops);
  php_hash_register_algo("xxh3",    &php_hash_xxh3_64_ops);
  php_hash_register_algo("xxh128",    &php_hash_xxh3_128_ops);

  PHP_HASH_HAVAL_REGISTER(3,128);
  PHP_HASH_HAVAL_REGISTER(3,160);
  PHP_HASH_HAVAL_REGISTER(3,192);
  PHP_HASH_HAVAL_REGISTER(3,224);
  PHP_HASH_HAVAL_REGISTER(3,256);

  PHP_HASH_HAVAL_REGISTER(4,128);
  PHP_HASH_HAVAL_REGISTER(4,160);
  PHP_HASH_HAVAL_REGISTER(4,192);
  PHP_HASH_HAVAL_REGISTER(4,224);
  PHP_HASH_HAVAL_REGISTER(4,256);

  PHP_HASH_HAVAL_REGISTER(5,128);
  PHP_HASH_HAVAL_REGISTER(5,160);
  PHP_HASH_HAVAL_REGISTER(5,192);
  PHP_HASH_HAVAL_REGISTER(5,224);
  PHP_HASH_HAVAL_REGISTER(5,256);

  register_hash_symbols(module_number);

  php_hashcontext_ce = register_class_HashContext();
  php_hashcontext_ce->create_object = php_hashcontext_create;

  memcpy(&php_hashcontext_handlers, &std_object_handlers,
         sizeof(zend_object_handlers));
  php_hashcontext_handlers.offset = offsetof(php_hashcontext_object, std);
  php_hashcontext_handlers.free_obj = php_hashcontext_free;
  php_hashcontext_handlers.clone_obj = php_hashcontext_clone;

#ifdef PHP_MHASH_BC
  mhash_init(INIT_FUNC_ARGS_PASSTHRU);
#endif

  return SUCCESS;
}
/* }}} */

/* {{{ PHP_MSHUTDOWN_FUNCTION */
PHP_MSHUTDOWN_FUNCTION(hash)
{
  zend_hash_destroy(&php_hash_hashtable);

  return SUCCESS;
}
/* }}} */

/* {{{ PHP_MINFO_FUNCTION */
PHP_MINFO_FUNCTION(hash)
{
  char buffer[2048];
  zend_string *str;
  char *s = buffer, *e = s + sizeof(buffer);

  ZEND_HASH_MAP_FOREACH_STR_KEY(&php_hash_hashtable, str) {
    s += slprintf(s, e - s, "%s ", ZSTR_VAL(str));
  } ZEND_HASH_FOREACH_END();
  *s = 0;

  php_info_print_table_start();
  php_info_print_table_row(2, "hash support", "enabled");
  php_info_print_table_row(2, "Hashing Engines", buffer);
  php_info_print_table_end();

#ifdef PHP_MHASH_BC
  php_info_print_table_start();
  php_info_print_table_row(2, "MHASH support", "Enabled");
  php_info_print_table_row(2, "MHASH API Version", "Emulated Support");
  php_info_print_table_end();
#endif

}
/* }}} */

/* {{{ hash_module_entry */
zend_module_entry hash_module_entry = {
  STANDARD_MODULE_HEADER,
  PHP_HASH_EXTNAME,
  ext_functions,
  PHP_MINIT(hash),
  PHP_MSHUTDOWN(hash),
  NULL, /* RINIT */
  NULL, /* RSHUTDOWN */
  PHP_MINFO(hash),
  PHP_HASH_VERSION,
  STANDARD_MODULE_PROPERTIES
};
/* }}} */

Coverage Report

Created: 2026-09-14 06:25