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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <auth.h>
#include <mp.h>
#include <libsec.h>
#include "rsa2any.h"
RSApriv*
getrsakey(int argc, char **argv, int needprivate, Attr **pa)
{
char *file, *s, *p;
int sz;
RSApriv *key;
Biobuf *b;
int regen;
Attr *a;
if(argc == 0)
file = "/fd/0";
else
file = argv[0];
key = mallocz(sizeof(RSApriv), 1);
if(key == nil)
return nil;
if((b = Bopen(file, OREAD)) == nil){
werrstr("open %s: %r", file);
return nil;
}
s = Brdstr(b, '\n', 1);
if(s == nil){
werrstr("read %s: %r", file);
return nil;
}
if(strncmp(s, "key ", 4) != 0){
werrstr("bad key format");
return nil;
}
regen = 0;
a = _parseattr(s+4);
if(a == nil){
werrstr("empty key");
return nil;
}
if((p = _strfindattr(a, "proto")) == nil){
werrstr("no proto");
return nil;
}
if(strcmp(p, "rsa") != 0){
werrstr("proto not rsa");
return nil;
}
if((p = _strfindattr(a, "ek")) == nil){
werrstr("no ek");
return nil;
}
if((key->pub.ek = strtomp(p, &p, 16, nil)) == nil || *p != 0){
werrstr("bad ek");
return nil;
}
if((p = _strfindattr(a, "n")) == nil){
werrstr("no n");
return nil;
}
if((key->pub.n = strtomp(p, &p, 16, nil)) == nil || *p != 0){
werrstr("bad n");
return nil;
}
if((p = _strfindattr(a, "size")) == nil)
fprint(2, "warning: missing size; will add\n");
else if((sz = strtol(p, &p, 10)) == 0 || *p != 0)
fprint(2, "warning: bad size; will correct\n");
else if(sz != mpsignif(key->pub.n))
fprint(2, "warning: wrong size (got %d, expected %d); will correct\n",
sz, mpsignif(key->pub.n));
if(!needprivate)
goto call;
if((p = _strfindattr(a, "!dk")) == nil){
werrstr("no !dk");
return nil;
}
if((key->dk = strtomp(p, &p, 16, nil)) == nil || *p != 0){
werrstr("bad !dk");
return nil;
}
if((p = _strfindattr(a, "!p")) == nil){
werrstr("no !p");
return nil;
}
if((key->p = strtomp(p, &p, 16, nil)) == nil || *p != 0){
werrstr("bad !p");
return nil;
}
if((p = _strfindattr(a, "!q")) == nil){
werrstr("no !q");
return nil;
}
if((key->q = strtomp(p, &p, 16, nil)) == nil || *p != 0){
werrstr("bad !q");
return nil;
}
if((p = _strfindattr(a, "!kp")) == nil){
fprint(2, "warning: no !kp\n");
regen = 1;
goto regen;
}
if((key->kp = strtomp(p, &p, 16, nil)) == nil || *p != 0){
fprint(2, "warning: bad !kp\n");
regen = 1;
goto regen;
}
if((p = _strfindattr(a, "!kq")) == nil){
fprint(2, "warning: no !kq\n");
regen = 1;
goto regen;
}
if((key->kq = strtomp(p, &p, 16, nil)) == nil || *p != 0){
fprint(2, "warning: bad !kq\n");
regen = 1;
goto regen;
}
if((p = _strfindattr(a, "!c2")) == nil){
fprint(2, "warning: no !c2\n");
regen = 1;
goto regen;
}
if((key->c2 = strtomp(p, &p, 16, nil)) == nil || *p != 0){
fprint(2, "warning: bad !c2\n");
regen = 1;
goto regen;
}
regen:
if(regen){
RSApriv *k2;
k2 = rsafill(key->pub.n, key->pub.ek, key->dk, key->p, key->q);
if(k2 == nil){
werrstr("regenerating chinese-remainder parts failed: %r");
return nil;
}
key = k2;
}
call:
a = _delattr(a, "ek");
a = _delattr(a, "n");
a = _delattr(a, "size");
a = _delattr(a, "!dk");
a = _delattr(a, "!p");
a = _delattr(a, "!q");
a = _delattr(a, "!c2");
a = _delattr(a, "!kp");
a = _delattr(a, "!kq");
if(pa)
*pa = a;
return key;
}
uchar*
put4(uchar *p, uint n)
{
p[0] = (n>>24)&0xFF;
p[1] = (n>>16)&0xFF;
p[2] = (n>>8)&0xFF;
p[3] = n&0xFF;
return p+4;
}
uchar*
putn(uchar *p, void *v, uint n)
{
memmove(p, v, n);
p += n;
return p;
}
uchar*
putstr(uchar *p, char *s)
{
p = put4(p, strlen(s));
p = putn(p, s, strlen(s));
return p;
}
uchar*
putmp2(uchar *p, mpint *b)
{
int bits, n;
if(mpcmp(b, mpzero) == 0)
return put4(p, 0);
bits = mpsignif(b);
n = (bits+7)/8;
if(bits%8 == 0){
p = put4(p, n+1);
*p++ = 0;
}else
p = put4(p, n);
mptobe(b, p, n, nil);
p += n;
return p;
}
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