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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*
- getkey(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 = "#d/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;
- }
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