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#include "os.h"
#include <libsec.h>
/*
* Define by analogy with desCBCencrypt; AES modes are not standardized yet.
* Because of the way that non-multiple-of-16 buffers are handled,
* the decryptor must be fed buffers of the same size as the encryptor.
*/
void
aesCBCencrypt(uchar *p, int len, AESstate *s)
{
uchar *p2, *ip, *eip;
uchar q[AESbsize];
for(; len >= AESbsize; len -= AESbsize){
p2 = p;
ip = s->ivec;
for(eip = ip+AESbsize; ip < eip; )
*p2++ ^= *ip++;
aes_encrypt(s->ekey, s->rounds, p, q);
memmove(s->ivec, q, AESbsize);
memmove(p, q, AESbsize);
p += AESbsize;
}
if(len > 0){
ip = s->ivec;
aes_encrypt(s->ekey, s->rounds, ip, q);
memmove(s->ivec, q, AESbsize);
for(eip = ip+len; ip < eip; )
*p++ ^= *ip++;
}
}
void
aesCBCdecrypt(uchar *p, int len, AESstate *s)
{
uchar *ip, *eip, *tp;
uchar tmp[AESbsize], q[AESbsize];
for(; len >= AESbsize; len -= AESbsize){
memmove(tmp, p, AESbsize);
aes_decrypt(s->dkey, s->rounds, p, q);
memmove(p, q, AESbsize);
tp = tmp;
ip = s->ivec;
for(eip = ip+AESbsize; ip < eip; ){
*p++ ^= *ip;
*ip++ = *tp++;
}
}
if(len > 0){
ip = s->ivec;
aes_encrypt(s->ekey, s->rounds, ip, q);
memmove(s->ivec, q, AESbsize);
for(eip = ip+len; ip < eip; )
*p++ ^= *ip++;
}
}
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