/**

 * Copyright (c) 2016 Daira Hopwood

 * Copyright (c) 2016 Pavol Rusnak

 *

 * Permission is hereby granted, free of charge, to any person obtaining

 * a copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES

 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

 * OTHER DEALINGS IN THE SOFTWARE.

 */

#include "address.h"

#include "bignum.h"

size_t address_prefix_bytes_len(uint32_t address_type) {

  if (address_type <= 0xFF) return 1;

  if (address_type <= 0xFFFF) return 2;

  if (address_type <= 0xFFFFFF) return 3;

  return 4;

}

void address_write_prefix_bytes(uint32_t address_type, uint8_t *out) {

  if (address_type > 0xFFFFFF) *(out++) = address_type >> 24;

  if (address_type > 0xFFFF) *(out++) = (address_type >> 16) & 0xFF;

  if (address_type > 0xFF) *(out++) = (address_type >> 8) & 0xFF;

  *(out++) = address_type & 0xFF;

}

bool address_check_prefix(const uint8_t *addr, uint32_t address_type) {

  if (address_type <= 0xFF) {

    return address_type == (uint32_t)(addr[0]);

  }

  if (address_type <= 0xFFFF) {

    return address_type == (((uint32_t)addr[0] << 8) | ((uint32_t)addr[1]));

  }

  if (address_type <= 0xFFFFFF) {

    return address_type == (((uint32_t)addr[0] << 16) |

                            ((uint32_t)addr[1] << 8) | ((uint32_t)addr[2]));

  }

  return address_type ==

         (((uint32_t)addr[0] << 24) | ((uint32_t)addr[1] << 16) |

          ((uint32_t)addr[2] << 8) | ((uint32_t)addr[3]));

}

#if USE_ETHEREUM

#include "sha3.h"

void ethereum_address_checksum(const uint8_t *addr, char *address, bool rskip60,

                               uint64_t chain_id) {

  const char *hex = "0123456789abcdef";

  address[0] = '0';

  address[1] = 'x';

  for (int i = 0; i < 20; i++) {

    address[2 + i * 2] = hex[(addr[i] >> 4) & 0xF];

    address[2 + i * 2 + 1] = hex[addr[i] & 0xF];

  }

  address[42] = 0;

  SHA3_CTX ctx = {0};

  uint8_t hash[32] = {0};

  keccak_256_Init(&ctx);

  if (rskip60) {

    char prefix[16] = {0};

    int prefix_size = bn_format_uint64(chain_id, NULL, "0x", 0, 0, false, 0,

                                       prefix, sizeof(prefix));

    keccak_Update(&ctx, (const uint8_t *)prefix, prefix_size);

  }

  keccak_Update(&ctx, (const uint8_t *)(address + 2), 40);

  keccak_Final(&ctx, hash);

  for (int i = 0; i < 20; i++) {

    if ((hash[i] & 0x80) && address[2 + i * 2] >= 'a' &&

        address[2 + i * 2] <= 'f') {

      address[2 + i * 2] -= 0x20;

    }

    if ((hash[i] & 0x08) && address[2 + i * 2 + 1] >= 'a' &&

        address[2 + i * 2 + 1] <= 'f') {

      address[2 + i * 2 + 1] -= 0x20;

    }

  }

}

#endif