/*

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

  | 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                                |

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

  | Authors: Michael Wallner <mike@php.net>                              |

  |          Sara Golemon <pollita@php.net>                              |

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

*/

#include "php_hash.h"

#include "php_hash_gost.h"

#include "php_hash_gost_tables.h"

/* {{{ Gost()

 * derived from gost_compress() by Markku-Juhani Saarinen <mjos@ssh.fi>

 */

#define round(tables, k1, k2) \

  t = (k1) + r; \

  l ^= tables[0][t & 0xff] ^ tables[1][(t >> 8) & 0xff] ^ \

    tables[2][(t >> 16) & 0xff] ^ tables[3][t >> 24]; \

  t = (k2) + l; \

  r ^= tables[0][t & 0xff] ^ tables[1][(t >> 8) & 0xff] ^ \

    tables[2][(t >> 16) & 0xff] ^ tables[3][t >> 24];

#define R(tables, key, h, i, t, l, r) \

  r = h[i]; \

  l = h[i + 1]; \

  round(tables, key[0], key[1]) \

  round(tables, key[2], key[3]) \

  round(tables, key[4], key[5]) \

  round(tables, key[6], key[7]) \

  round(tables, key[0], key[1]) \

  round(tables, key[2], key[3]) \

  round(tables, key[4], key[5]) \

  round(tables, key[6], key[7]) \

  round(tables, key[0], key[1]) \

  round(tables, key[2], key[3]) \

  round(tables, key[4], key[5]) \

  round(tables, key[6], key[7]) \

  round(tables, key[7], key[6]) \

  round(tables, key[5], key[4]) \

  round(tables, key[3], key[2]) \

  round(tables, key[1], key[0]) \

  t = r; \

  r = l; \

  l = t; \

#define X(w, u, v) \

  w[0] = u[0] ^ v[0]; \

  w[1] = u[1] ^ v[1]; \

  w[2] = u[2] ^ v[2]; \

  w[3] = u[3] ^ v[3]; \

  w[4] = u[4] ^ v[4]; \

  w[5] = u[5] ^ v[5]; \

  w[6] = u[6] ^ v[6]; \

  w[7] = u[7] ^ v[7];

#define P(key, w) \

  key[0] = (w[0]  & 0x000000ff) | ((w[2] & 0x000000ff) << 8) | \

    ((w[4] & 0x000000ff) << 16) | ((w[6] & 0x000000ff) << 24); \

  key[1] = ((w[0] & 0x0000ff00) >> 8)  | (w[2]  & 0x0000ff00) | \

    ((w[4] & 0x0000ff00) << 8) | ((w[6] & 0x0000ff00) << 16); \

  key[2] = ((w[0] & 0x00ff0000) >> 16) | ((w[2] & 0x00ff0000) >> 8) | \

    (w[4] & 0x00ff0000) | ((w[6] & 0x00ff0000) << 8); \

  key[3] = ((w[0] & 0xff000000) >> 24) | ((w[2] & 0xff000000) >> 16) | \

    ((w[4] & 0xff000000) >> 8) | (w[6] & 0xff000000); \

  key[4] = (w[1] & 0x000000ff) | ((w[3] & 0x000000ff) << 8) | \

    ((w[5] & 0x000000ff) << 16) | ((w[7] & 0x000000ff) << 24); \

  key[5] = ((w[1] & 0x0000ff00) >> 8) | (w[3]  & 0x0000ff00) | \

    ((w[5] & 0x0000ff00) << 8) | ((w[7] & 0x0000ff00) << 16); \

  key[6] = ((w[1] & 0x00ff0000) >> 16) | ((w[3] & 0x00ff0000) >> 8) | \

    (w[5] & 0x00ff0000) | ((w[7] & 0x00ff0000) << 8); \

  key[7] = ((w[1] & 0xff000000) >> 24) | ((w[3] & 0xff000000) >> 16) | \

    ((w[5] & 0xff000000) >> 8) | (w[7] & 0xff000000);

#define A(x, l, r) \

  l = x[0] ^ x[2]; \

  r = x[1] ^ x[3]; \

  x[0] = x[2]; \

  x[1] = x[3]; \

  x[2] = x[4]; \

  x[3] = x[5]; \

  x[4] = x[6]; \

  x[5] = x[7]; \

  x[6] = l; \

  x[7] = r;

#define AA(x, l, r) \

  l = x[0]; \

  r = x[2]; \

  x[0] = x[4]; \

  x[2] = x[6]; \

  x[4] = l ^ r; \

  x[6] = x[0] ^ r; \

  l = x[1]; \

  r = x[3]; \

  x[1] = x[5]; \

  x[3] = x[7]; \

  x[5] = l ^ r; \

  x[7] = x[1] ^ r;

#define C(x) \

  x[0] ^= 0xff00ff00; \

  x[1] ^= 0xff00ff00; \

  x[2] ^= 0x00ff00ff; \

  x[3] ^= 0x00ff00ff; \

  x[4] ^= 0x00ffff00; \

  x[5] ^= 0xff0000ff; \

  x[6] ^= 0x000000ff; \

  x[7] ^= 0xff00ffff;

#define S(s, l, r) \

    s[i] = r; \

    s[i + 1] = l;

#define SHIFT12(u, m, s) \

  u[0] = m[0] ^ s[6]; \

  u[1] = m[1] ^ s[7]; \

  u[2] = m[2] ^ (s[0] << 16) ^ (s[0] >> 16) ^ (s[0] & 0xffff) ^ \

    (s[1] & 0xffff) ^ (s[1] >> 16) ^ (s[2] << 16) ^ s[6] ^ (s[6] << 16) ^ \

    (s[7] & 0xffff0000) ^ (s[7] >> 16); \

  u[3] = m[3] ^ (s[0] & 0xffff) ^ (s[0] << 16) ^ (s[1] & 0xffff) ^ \

    (s[1] << 16) ^ (s[1] >> 16) ^ (s[2] << 16) ^ (s[2] >> 16) ^ \

    (s[3] << 16) ^ s[6] ^ (s[6] << 16) ^ (s[6] >> 16) ^ (s[7] & 0xffff) ^ \

    (s[7] << 16) ^ (s[7] >> 16); \

  u[4] = m[4] ^ \

    (s[0] & 0xffff0000) ^ (s[0] << 16) ^ (s[0] >> 16) ^ \

    (s[1] & 0xffff0000) ^ (s[1] >> 16) ^ (s[2] << 16) ^ (s[2] >> 16) ^ \

    (s[3] << 16) ^ (s[3] >> 16) ^ (s[4] << 16) ^ (s[6] << 16) ^ \

    (s[6] >> 16) ^(s[7] & 0xffff) ^ (s[7] << 16) ^ (s[7] >> 16); \

  u[5] = m[5] ^ (s[0] << 16) ^ (s[0] >> 16) ^ (s[0] & 0xffff0000) ^ \

    (s[1] & 0xffff) ^ s[2] ^ (s[2] >> 16) ^ (s[3] << 16) ^ (s[3] >> 16) ^ \

    (s[4] << 16) ^ (s[4] >> 16) ^ (s[5] << 16) ^  (s[6] << 16) ^ \

    (s[6] >> 16) ^ (s[7] & 0xffff0000) ^ (s[7] << 16) ^ (s[7] >> 16); \

  u[6] = m[6] ^ s[0] ^ (s[1] >> 16) ^ (s[2] << 16) ^ s[3] ^ (s[3] >> 16) ^ \

    (s[4] << 16) ^ (s[4] >> 16) ^ (s[5] << 16) ^ (s[5] >> 16) ^ s[6] ^ \

    (s[6] << 16) ^ (s[6] >> 16) ^ (s[7] << 16); \

  u[7] = m[7] ^ (s[0] & 0xffff0000) ^ (s[0] << 16) ^ (s[1] & 0xffff) ^ \

    (s[1] << 16) ^ (s[2] >> 16) ^ (s[3] << 16) ^ s[4] ^ (s[4] >> 16) ^ \

    (s[5] << 16) ^ (s[5] >> 16) ^ (s[6] >> 16) ^ (s[7] & 0xffff) ^ \

    (s[7] << 16) ^ (s[7] >> 16);

#define SHIFT16(h, v, u) \

  v[0] = h[0] ^ (u[1] << 16) ^ (u[0] >> 16); \

  v[1] = h[1] ^ (u[2] << 16) ^ (u[1] >> 16); \

  v[2] = h[2] ^ (u[3] << 16) ^ (u[2] >> 16); \

  v[3] = h[3] ^ (u[4] << 16) ^ (u[3] >> 16); \

  v[4] = h[4] ^ (u[5] << 16) ^ (u[4] >> 16); \

  v[5] = h[5] ^ (u[6] << 16) ^ (u[5] >> 16); \

  v[6] = h[6] ^ (u[7] << 16) ^ (u[6] >> 16); \

  v[7] = h[7] ^ (u[0] & 0xffff0000) ^ (u[0] << 16) ^ (u[7] >> 16) ^ \

    (u[1] & 0xffff0000) ^ (u[1] << 16) ^ (u[6] << 16) ^ (u[7] & 0xffff0000);

#define SHIFT61(h, v) \

  h[0] = (v[0] & 0xffff0000) ^ (v[0] << 16) ^ (v[0] >> 16) ^ (v[1] >> 16) ^ \

    (v[1] & 0xffff0000) ^ (v[2] << 16) ^ (v[3] >> 16) ^ (v[4] << 16) ^ \

    (v[5] >> 16) ^ v[5] ^ (v[6] >> 16) ^ (v[7] << 16) ^ (v[7] >> 16) ^ \

    (v[7] & 0xffff); \

  h[1] = (v[0] << 16) ^ (v[0] >> 16) ^ (v[0] & 0xffff0000) ^ (v[1] & 0xffff) ^ \

  v[2] ^ (v[2] >> 16) ^ (v[3] << 16) ^ (v[4] >> 16) ^ (v[5] << 16) ^ \

    (v[6] << 16) ^ v[6] ^ (v[7] & 0xffff0000) ^ (v[7] >> 16); \

  h[2] = (v[0] & 0xffff) ^ (v[0] << 16) ^ (v[1] << 16) ^ (v[1] >> 16) ^ \

    (v[1] & 0xffff0000) ^ (v[2] << 16) ^ (v[3] >> 16) ^ v[3] ^ (v[4] << 16) ^ \

    (v[5] >> 16) ^ v[6] ^ (v[6] >> 16) ^ (v[7] & 0xffff) ^ (v[7] << 16) ^ \

    (v[7] >> 16); \

  h[3] = (v[0] << 16) ^ (v[0] >> 16) ^ (v[0] & 0xffff0000) ^ \

    (v[1] & 0xffff0000) ^ (v[1] >> 16) ^ (v[2] << 16) ^ (v[2] >> 16) ^ v[2] ^ \

    (v[3] << 16) ^ (v[4] >> 16) ^ v[4] ^ (v[5] << 16) ^ (v[6] << 16) ^ \

    (v[7] & 0xffff) ^ (v[7] >> 16); \

  h[4] = (v[0] >> 16) ^ (v[1] << 16) ^ v[1] ^ (v[2] >> 16) ^ v[2] ^ \

    (v[3] << 16) ^ (v[3] >> 16) ^ v[3] ^ (v[4] << 16) ^ (v[5] >> 16) ^ \

  v[5] ^ (v[6] << 16) ^ (v[6] >> 16) ^ (v[7] << 16); \

  h[5] = (v[0] << 16) ^ (v[0] & 0xffff0000) ^ (v[1] << 16) ^ (v[1] >> 16) ^ \

    (v[1] & 0xffff0000) ^ (v[2] << 16) ^ v[2] ^ (v[3] >> 16) ^ v[3] ^ \

    (v[4] << 16) ^ (v[4] >> 16) ^ v[4] ^ (v[5] << 16) ^ (v[6] << 16) ^ \

    (v[6] >> 16) ^ v[6] ^ (v[7] << 16) ^ (v[7] >> 16) ^ (v[7] & 0xffff0000); \

  h[6] = v[0] ^ v[2] ^ (v[2] >> 16) ^ v[3] ^ (v[3] << 16) ^ v[4] ^ \

    (v[4] >> 16) ^ (v[5] << 16) ^ (v[5] >> 16) ^ v[5] ^ (v[6] << 16) ^ \

    (v[6] >> 16) ^ v[6] ^ (v[7] << 16) ^ v[7]; \

  h[7] = v[0] ^ (v[0] >> 16) ^ (v[1] << 16) ^ (v[1] >> 16) ^ (v[2] << 16) ^ \

    (v[3] >> 16) ^ v[3] ^ (v[4] << 16) ^ v[4] ^ (v[5] >> 16) ^ v[5] ^ \

    (v[6] << 16) ^ (v[6] >> 16) ^ (v[7] << 16) ^ v[7];

#define PASS(tables) \

  X(w, u, v); \

  P(key, w); \

  R((tables), key, h, i, t, l, r); \

  S(s, l, r); \

  if (i != 6) { \

    A(u, l, r); \

    if (i == 2) { \

      C(u); \

    } \

    AA(v, l, r); \

  }

static inline void Gost(PHP_GOST_CTX *context, uint32_t data[8])

{

  int i;

  uint32_t l, r, t, key[8], u[8], v[8], w[8], s[8], *h = context->state, *m = data;

  memcpy(u, context->state, sizeof(u));

  memcpy(v, data, sizeof(v));

  for (i = 0; i < 8; i += 2) {

    PASS(*context->tables);

  }

  SHIFT12(u, m, s);

  SHIFT16(h, v, u);

  SHIFT61(h, v);

}

/* }}} */

static inline void GostTransform(PHP_GOST_CTX *context, const unsigned char input[32])

{

  int i, j;

  uint32_t data[8], temp = 0;

  for (i = 0, j = 0; i < 8; ++i, j += 4) {

    data[i] = ((uint32_t) input[j]) | (((uint32_t) input[j + 1]) << 8) |

          (((uint32_t) input[j + 2]) << 16) | (((uint32_t) input[j + 3]) << 24);

    context->state[i + 8] += data[i] + temp;

    temp = context->state[i + 8] < data[i] ? 1 : (context->state[i + 8] == data[i] ? temp : 0);

  }

  Gost(context, data);

}

PHP_HASH_API void PHP_GOSTInit(PHP_GOST_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)

{

  memset(context, 0, sizeof(*context));

  context->tables = &tables_test;

}

PHP_HASH_API void PHP_GOSTInitCrypto(PHP_GOST_CTX *context, ZEND_ATTRIBUTE_UNUSED HashTable *args)

{

  PHP_GOSTInit(context, NULL);

  context->tables = &tables_crypto;

}

static const uint32_t MAX32 = 0xffffffffLU;

PHP_HASH_API void PHP_GOSTUpdate(PHP_GOST_CTX *context, const unsigned char *input, size_t len)

{

  if ((MAX32 - context->count[0]) < (len * 8)) {

    context->count[1]++;

    context->count[0] = MAX32 - context->count[0];

    context->count[0] = (len * 8) - context->count[0];

  } else {

    context->count[0] += len * 8;

  }

  if (context->length + len < 32) {

    memcpy(&context->buffer[context->length], input, len);

    context->length += (unsigned char)len;

  } else {

    size_t i = 0, r = (context->length + len) % 32;

    if (context->length) {

      i = 32 - context->length;

      memcpy(&context->buffer[context->length], input, i);

      GostTransform(context, context->buffer);

    }

    for (; i + 32 <= len; i += 32) {

      GostTransform(context, input + i);

    }

    memcpy(context->buffer, input + i, r);

    ZEND_SECURE_ZERO(&context->buffer[r], 32 - r);

    context->length = (unsigned char)r;

  }

}

PHP_HASH_API void PHP_GOSTFinal(unsigned char digest[32], PHP_GOST_CTX *context)

{

  uint32_t i, j, l[8] = {0};

  if (context->length) {

    GostTransform(context, context->buffer);

  }

  memcpy(l, context->count, sizeof(context->count));

  Gost(context, l);

  memcpy(l, &context->state[8], sizeof(l));

  Gost(context, l);

  for (i = 0, j = 0; j < 32; i++, j += 4) {

    digest[j] = (unsigned char) (context->state[i] & 0xff);

    digest[j + 1] = (unsigned char) ((context->state[i] >> 8) & 0xff);

    digest[j + 2] = (unsigned char) ((context->state[i] >> 16) & 0xff);

    digest[j + 3] = (unsigned char) ((context->state[i] >> 24) & 0xff);

  }

  ZEND_SECURE_ZERO(context, sizeof(*context));

}

static hash_spec_result php_gost_unserialize(php_hashcontext_object *hash, zend_long magic, const zval *zv)

{

  PHP_GOST_CTX *ctx = (PHP_GOST_CTX *) hash->context;

  hash_spec_result r = HASH_SPEC_FAILURE;

  if (magic == PHP_HASH_SERIALIZE_MAGIC_SPEC

    && (r = php_hash_unserialize_spec(hash, zv, PHP_GOST_SPEC)) == HASH_SPEC_SUCCESS

    && ctx->length < sizeof(ctx->buffer)) {

    return HASH_SPEC_SUCCESS;

  }

    return r != HASH_SPEC_SUCCESS ? r : CONTEXT_VALIDATION_FAILURE;

}

const php_hash_ops php_hash_gost_ops = {

  "gost",

  (php_hash_init_func_t) PHP_GOSTInit,

  (php_hash_update_func_t) PHP_GOSTUpdate,

  (php_hash_final_func_t) PHP_GOSTFinal,

  php_hash_copy,

  php_hash_serialize,

  php_gost_unserialize,

  PHP_GOST_SPEC,

  32,

  32,

  sizeof(PHP_GOST_CTX),

  1,

  0

};

const php_hash_ops php_hash_gost_crypto_ops = {

  "gost-crypto",

  (php_hash_init_func_t) PHP_GOSTInitCrypto,

  (php_hash_update_func_t) PHP_GOSTUpdate,

  (php_hash_final_func_t) PHP_GOSTFinal,

  php_hash_copy,

  php_hash_serialize,

  php_gost_unserialize,

  PHP_GOST_SPEC,

  32,

  32,

  sizeof(PHP_GOST_CTX),

  1,

  0

};