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26 7u83 1 
#include "os.h"
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#include <libsec.h>
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typedef ulong u32;
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void
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aesCFBencrypt(uchar *p, int len, AESstate *s)
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{
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	u32 a, o = s->offset;
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	while(len > 0){
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		if(o % 16){
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		Odd:
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			a = (s->ivec[o++ % 16] ^= *p), *p++ = a, len--;
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			continue;
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		}
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		aes_encrypt(s->ekey, s->rounds, s->ivec, s->ivec);
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		if(len < 16 || ((p-(uchar*)0) & 3) != 0)
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			goto Odd;
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		((u32*)p)[0] = (((u32*)s->ivec)[0] ^= ((u32*)p)[0]);
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		((u32*)p)[1] = (((u32*)s->ivec)[1] ^= ((u32*)p)[1]);
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		((u32*)p)[2] = (((u32*)s->ivec)[2] ^= ((u32*)p)[2]);
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		((u32*)p)[3] = (((u32*)s->ivec)[3] ^= ((u32*)p)[3]);
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		o += 16, p += 16, len -= 16;
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	}
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	s->offset = o;
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}
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void
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aesCFBdecrypt(uchar *p, int len, AESstate *s)
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{
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	u32 a, o = s->offset;
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	while(len > 0){
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		if(o % 16){
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		Odd:
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			a = *p, *p++ ^= s->ivec[o % 16], s->ivec[o++ % 16] = a, len--;
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			continue;
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		}
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		aes_encrypt(s->ekey, s->rounds, s->ivec, s->ivec);
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		if(len < 16 || ((p-(uchar*)0) & 3) != 0)
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			goto Odd;
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		a = ((u32*)p)[0], ((u32*)p)[0] ^= ((u32*)s->ivec)[0], ((u32*)s->ivec)[0] = a;
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		a = ((u32*)p)[1], ((u32*)p)[1] ^= ((u32*)s->ivec)[1], ((u32*)s->ivec)[1] = a;
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		a = ((u32*)p)[2], ((u32*)p)[2] ^= ((u32*)s->ivec)[2], ((u32*)s->ivec)[2] = a;
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		a = ((u32*)p)[3], ((u32*)p)[3] ^= ((u32*)s->ivec)[3], ((u32*)s->ivec)[3] = a;
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		o += 16, p += 16, len -= 16;
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	}
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	s->offset = o;
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}