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#include "os.h"
#include <libsec.h>
typedef ulong u32;
void
aesOFBencrypt(uchar *p, int len, AESstate *s)
{
u32 o = s->offset;
while(len > 0){
if(o % 16){
Odd:
*p++ ^= s->ivec[o++ % 16], len--;
continue;
}
aes_encrypt(s->ekey, s->rounds, s->ivec, s->ivec);
if(len < 16 || ((p-(uchar*)0) & 3) != 0)
goto Odd;
((u32*)p)[0] ^= ((u32*)s->ivec)[0];
((u32*)p)[1] ^= ((u32*)s->ivec)[1];
((u32*)p)[2] ^= ((u32*)s->ivec)[2];
((u32*)p)[3] ^= ((u32*)s->ivec)[3];
o += 16, p += 16, len -= 16;
}
s->offset = o;
}
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