搜狗笔试真题

|来源:新高考网

  -- #include "stdint.h"

  // 注:以上内容没有前面的“--”,做时去掉即可

  int encode(const void* raw_in, void* raw_out, uint32_t password, size_t len)

  {

  const uint8_t* in = (const uint8_t*)raw_in;

  uint8_t* out = (uint8_t*)raw_out;

  uint32_t seed = password ^ 0x42381238u;

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

  uint8_t a = ( in[i] ^ seed ) >> 2;

  uint8_t b = ( ( ((uint32_t)in[i]) << 10 ) ^ seed ) >> (10-6);

  a &= 63;

  b &= 192;

  a = 63 & ( a ^ (b << 3));

  out[i] = a | b;

  seed = (((seed << 7) ^ seed ^ in[i]) + 48475829);

  }

  return 0;

  }

  int decode(const void* raw_in, void* raw_out, uint32_t password, size_t len)

  {

  const uint8_t* in = (const uint8_t*)raw_in;

  uint8_t* out = (uint8_t*)raw_out;

  uint32_t seed = password ^ 0x42381238u;

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

  // 请在此处补全代码

  }

  }

  int main()

  {

  const uint8_t buf1[] = {0xf5, 0x3b, 0x3a, 0x0d, 0x54, 0x73, 0x34, 0xfe, 0x5d, 0x72, 0x2d, 0x8b, 0xca, 0x1d, 0xdb, 0xd4, 0x94, 0xfa, 0x88, 0xae, 0x51, 0x4f, 0x85, 0x38, 0x96, 0x33, 0xf1, 0xa3, 0x41, 0xf9, 0xc8, 0x67, 0xfc, 0x01, 0xc7, 0xdd, 0x22, 0xe7, 0xbd, 0x83, };

  uint8_t buf2[100] = {};

  const uint32_t password = 0x266d183bu;

  const size_t len = sizeof(buf1);

  encode(buf1, buf2, password, len);

  printf("%s\n", buf2);

  }

  求哈希解码算法

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