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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/src/cmd/ssh1/cipher3des.c – Rev 2

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#include "ssh.h"
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struct CipherState
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{
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	DESstate enc3des[3];
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	DESstate dec3des[3];
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};
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static CipherState*
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init3des(Conn *c, int)
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{
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	int i;
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	CipherState *cs;
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	cs = emalloc(sizeof(CipherState));
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	for(i=0; i<3; i++){
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		setupDESstate(&cs->enc3des[i], c->sesskey+8*i, nil);
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		setupDESstate(&cs->dec3des[i], c->sesskey+8*i, nil);
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	}
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	return cs;
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}
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static void
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encrypt3des(CipherState *cs, uchar *buf, int nbuf)
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{
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	desCBCencrypt(buf, nbuf, &cs->enc3des[0]);
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	desCBCdecrypt(buf, nbuf, &cs->enc3des[1]);
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	desCBCencrypt(buf, nbuf, &cs->enc3des[2]);
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}
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static void
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decrypt3des(CipherState *cs, uchar *buf, int nbuf)
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{
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	desCBCdecrypt(buf, nbuf, &cs->dec3des[2]);
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	desCBCencrypt(buf, nbuf, &cs->dec3des[1]);
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	desCBCdecrypt(buf, nbuf, &cs->dec3des[0]);
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}
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Cipher cipher3des =
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{
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	SSH_CIPHER_3DES,
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	"3des",
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	init3des,
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	encrypt3des,
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	decrypt3des,
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};
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