#include "agent.h"#include <mp.h>#include <libsec.h> typedef struct Sshrsastate Sshrsastate; enum {	Readpub,	Writechal,	Readresp,	Done,};struct Sshrsastate {	RSApriv *priv;	Key *k;	mpint *resp;	int phase;}; static RSApriv*readrsapriv(char *s){	RSApriv *priv; 	priv = rsaprivalloc(); 	strtoul(s, &s, 10);	if((priv->pub.ek=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->dk=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->pub.n=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->p=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->q=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->kp=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->kq=strtomp(s, &s, 16, nil)) == nil)		goto Error;	if((priv->c2=strtomp(s, &s, 16, nil)) == nil)		goto Error; 	return priv; Error:	rsaprivfree(priv);	return nil;} void*sshrsaopen(Key *k, char*, int client){	Sshrsastate *s; 	fmtinstall('B', mpconv);	assert(client);	s = emalloc(sizeof *s);	s->priv = readrsapriv(s_to_c(k->data));	s->k = k;	if(s->priv == nil){		agentlog("error parsing ssh key %s", k->file);		free(s);		return nil;	}	return s;} intsshrsaread(void *va, void *buf, int n){	Sshrsastate *s; 	s = va;	switch(s->phase){	case Readpub:		s->phase = Done;		return snprint(buf, n, "%B", s->priv->pub.n);	case Readresp:		s->phase = Done;		return snprint(buf, n, "%B", s->resp);	default:		return 0;	}} intsshrsawrite(void *va, void *vbuf, int n){	mpint *m;	char *buf;	Sshrsastate *s; 	s = va;	if((s->k->flags&Fconfirmuse) && confirm("ssh use") < 0)		return -1; 	buf = emalloc(n+1);	memmove(buf, vbuf, n);	buf[n] = '\0';	m = strtomp(buf, nil, 16, nil);	free(buf);	if(m == nil){		werrstr("bad bignum");		return -1;	} 	agentlog("ssh use");	m = rsadecrypt(s->priv, m, m);	s->resp = m;	s->phase = Readresp;	return n;} voidsshrsaclose(void *v){	Sshrsastate *s; 	s = v;	rsaprivfree(s->priv);	mpfree(s->resp);	free(s);} Proto sshrsa = {.name=	"ssh-rsa",.perm=	0666,.open=	sshrsaopen,.read=	sshrsaread,.write=	sshrsawrite,.close=	sshrsaclose,};