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#include <linux/kernel.h>
#include <linux/string.h>
#define R(r, a, b, c, d) ( \
a += b + (r ^ key[0]), \
d = rol32(d ^ a, 16), \
c += d + (r ^ key[1]), \
b = rol32(b ^ c, 12), \
a += b + (r ^ key[2]), \
d = rol32(d ^ a, 8), \
c += d + (r ^ key[3]), \
b = rol32(b ^ c, 7))
static const u32 rc[4] = {
/* expand 32-byte k */
0x61707865U, 0x3320646eU, 0x79622d32U, 0x6b206574U
};
static inline void blockcipher(u32 block[4], const u32 key[4])
{
R(rc[0], block[0], block[1], block[2], block[3]);
R(rc[1], block[3], block[2], block[1], block[0]);
R(rc[2], block[2], block[3], block[0], block[1]);
R(rc[3], block[1], block[0], block[3], block[2]);
}
void mix_quarcha(u32 h[4], const u32 m[4])
{
u32 n[4];
memcpy(n, h, sizeof(n));
blockcipher(h, m);
h[0] ^= n[0];
h[1] ^= n[1];
h[2] ^= n[2];
h[3] ^= n[3];
}
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