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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libsec/port/desCBC.c – Rev 2

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#include "os.h"
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#include <mp.h>
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#include <libsec.h>
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// Because of the way that non multiple of 8
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// buffers are handled, the decryptor must
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// be fed buffers of the same size as the
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// encryptor
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// If the length is not a multiple of 8, I encrypt
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// the overflow to be compatible with lacy's cryptlib
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void
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desCBCencrypt(uchar *p, int len, DESstate *s)
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{
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	uchar *p2, *ip, *eip;
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	for(; len >= 8; len -= 8){
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		p2 = p;
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		ip = s->ivec;
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		for(eip = ip+8; ip < eip; )
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			*p2++ ^= *ip++;
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		block_cipher(s->expanded, p, 0);
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		memmove(s->ivec, p, 8);
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		p += 8;
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	}
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	if(len > 0){
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		ip = s->ivec;
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		block_cipher(s->expanded, ip, 0);
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		for(eip = ip+len; ip < eip; )
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			*p++ ^= *ip++;
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	}
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}
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void
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desCBCdecrypt(uchar *p, int len, DESstate *s)
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{
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	uchar *ip, *eip, *tp;
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	uchar tmp[8];
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	for(; len >= 8; len -= 8){
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		memmove(tmp, p, 8);
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		block_cipher(s->expanded, p, 1);
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		tp = tmp;
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		ip = s->ivec;
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		for(eip = ip+8; ip < eip; ){
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			*p++ ^= *ip;
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			*ip++ = *tp++;
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		}
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	}
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	if(len > 0){
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		ip = s->ivec;
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		block_cipher(s->expanded, ip, 0);
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		for(eip = ip+len; ip < eip; )
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			*p++ ^= *ip++;
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	}
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}