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pki: Create pki_publickey_from_privatekey().

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This commit is contained in:
Andreas Schneider
2011-08-07 16:56:33 +02:00
parent f55cd7de43
commit 36ee2d3332
4 changed files with 216 additions and 185 deletions
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157
src/pki_gcrypt.c
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@@ -959,6 +959,163 @@ fail:
return NULL;
}
ssh_key pki_publickey_from_privatekey(ssh_key privkey) {
ssh_key pubkey = NULL;
gcry_sexp_t sexp;
const char *tmp = NULL;
ssh_string p = NULL;
ssh_string q = NULL;
ssh_string g = NULL;
ssh_string y = NULL;
ssh_string e = NULL;
ssh_string n = NULL;
size_t size;
if (privkey == NULL || !ssh_key_is_private(privkey)) {
return NULL;
}
pubkey = ssh_key_new();
if (pubkey == NULL) {
return NULL;
}
pubkey->type = privkey->type;
switch(pubkey->type) {
case SSH_KEYTYPE_DSS:
sexp = gcry_sexp_find_token(privkey->dsa, "p", 0);
if (sexp == NULL) {
goto fail;
}
tmp = gcry_sexp_nth_data(sexp, 1, &size);
p = ssh_string_new(size);
if (p == NULL) {
goto fail;
}
ssh_string_fill(p,(char *) tmp, size);
gcry_sexp_release(sexp);
sexp = gcry_sexp_find_token(privkey->dsa,"q",0);
if (sexp == NULL) {
goto fail;
}
tmp = gcry_sexp_nth_data(sexp,1,&size);
q = ssh_string_new(size);
if (q == NULL) {
goto fail;
}
ssh_string_fill(q,(char *) tmp,size);
gcry_sexp_release(sexp);
sexp = gcry_sexp_find_token(privkey->dsa, "g", 0);
if (sexp == NULL) {
goto fail;
}
tmp = gcry_sexp_nth_data(sexp,1,&size);
g = ssh_string_new(size);
if (g == NULL) {
goto fail;
}
ssh_string_fill(g,(char *) tmp,size);
gcry_sexp_release(sexp);
sexp = gcry_sexp_find_token(privkey->dsa,"y",0);
if (sexp == NULL) {
goto fail;
}
tmp = gcry_sexp_nth_data(sexp,1,&size);
y = ssh_string_new(size);
if (y == NULL) {
goto fail;
}
ssh_string_fill(y,(char *) tmp,size);
gcry_sexp_release(sexp);
gcry_sexp_build(&pubkey->dsa, NULL,
"(public-key(dsa(p %b)(q %b)(g %b)(y %b)))",
ssh_string_len(p), ssh_string_data(p),
ssh_string_len(q), ssh_string_data(q),
ssh_string_len(g), ssh_string_data(g),
ssh_string_len(y), ssh_string_data(y));
ssh_string_burn(p);
ssh_string_free(p);
ssh_string_burn(q);
ssh_string_free(q);
ssh_string_burn(g);
ssh_string_free(g);
ssh_string_burn(y);
ssh_string_free(y);
break;
case SSH_KEYTYPE_RSA:
case SSH_KEYTYPE_RSA1:
sexp = gcry_sexp_find_token(privkey->rsa, "n", 0);
if (sexp == NULL) {
goto fail;
}
tmp = gcry_sexp_nth_data(sexp, 1, &size);
n = ssh_string_new(size);
if (n == NULL) {
goto fail;
}
ssh_string_fill(n, (char *) tmp, size);
gcry_sexp_release(sexp);
sexp = gcry_sexp_find_token(privkey->rsa, "e", 0);
if (sexp == NULL) {
goto fail;
}
tmp = gcry_sexp_nth_data(sexp, 1, &size);
e = ssh_string_new(size);
if (e == NULL) {
goto fail;
}
ssh_string_fill(e, (char *) tmp, size);
gcry_sexp_release(sexp);
gcry_sexp_build(&pubkey->rsa, NULL,
"(public-key(rsa(n %b)(e %b)))",
ssh_string_len(n), ssh_string_data(n),
ssh_string_len(e), ssh_string_data(e));
if (pubkey->rsa == NULL) {
goto fail;
}
ssh_string_burn(e);
ssh_string_free(e);
ssh_string_burn(n);
ssh_string_free(n);
break;
case SSH_KEYTYPE_ECDSA:
case SSH_KEYTYPE_UNKNOWN:
ssh_key_free(pubkey);
return NULL;
}
pubkey->type_c = ssh_key_type_to_char(privkey->type);
return pubkey;
fail:
gcry_sexp_release(sexp);
ssh_string_burn(p);
ssh_string_free(p);
ssh_string_burn(q);
ssh_string_free(q);
ssh_string_burn(g);
ssh_string_free(g);
ssh_string_burn(y);
ssh_string_free(y);
ssh_string_burn(e);
ssh_string_free(e);
ssh_string_burn(n);
ssh_string_free(n);
ssh_key_free(pubkey);
return NULL;
}
#endif /* HAVE_LIBGCRYPT */
/**