Re: [PATCH] replace sha1 with another algorithm

> +static void xor_bytes(unsigned char *out, unsigned char *a, unsigned char *b,
> +		      unsigned n)
> +{
> +	unsigned i;
> +	for (i = 0; i < n; i++)
> +		out[i] = a[i] ^ b[i];
> +}
> +
> +static void mix_hash(unsigned char *h, unsigned n)
> +{
> +	unsigned char out[20];
> +	unsigned mid = n / 2;
> +
> +	if (2*mid < n)
> +		return;
> +
> +	xor_bytes(out, h, h + mid, mid);
> +	xor_bytes(out + mid, h + mid, h, mid);
> +	memcpy(h, out, n);
> +
> +	/* If a little bit of mixing is good, then a lot must be GREAT! */
> +	mix_hash(h, mid);
> +	mix_hash(h + mid, mid);
> +}