HashWord "hello" ;get dd 22, sizeWord
                 ;db "hello" 
HashWord "understood" ;get dd 0x34aa22,sizeWord
    

const int k = 31, mod = 1e9+7;

string s = "abracadabraz";
long long h = 0, m = 1;
for (char c : s) {
    int x = (int) (c - 'a' + 1);
    h = (h + m * x) % mod;
    m = (m * k) % mod;
}
;or this variant
long long compute_hash(string const& s) {
    const int p = 31;
    const int m = 1e9 + 9;
    long long hash_value = 0;
    long long p_pow = 1;
    for (char c : s) {
        hash_value = (hash_value + (c - 'a' + 1) * p_pow) % m;
        p_pow = (p_pow * p) % m;
    }
    return hash_value;
}
    

macro embed_crc start,finish {
 local b,c
   c = 0xffffffff
      repeat finish-start
         load b byte from start+%-1
          c = c xor b
         repeat 8
                    c = (c shr 1) xor (0xedb88320 * (c and 1))
          end repeat
  end repeat
  dd c xor 0xffffffff
}    

start is inclusive and finish is exclusive.

Use like this
Code:

MyCode:
   mov     eax,0x12345678
      xor     eax,edx
     ret

     embed_crc $$,$