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gpg: Fix export of NIST ECC keys.

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* common/openpgp-oid.c (struct oidtable): New.
(openpgp_curve_to_oid): Rewrite and allow OID as input.
(openpgp_oid_to_curve): Make use of the new table.
--

Due to the previous change we now usually store the OID with the
private key and not the name.  Thus during import we do not anymore
need to map the name to an oid but can use the oid directly.  We fix
that by extending openpgp_curve_to_oid to allow an oidstr as input.
This commit is contained in:
Werner Koch 2014-09-02 12:10:19 +02:00
parent afe85582dd
commit bf2fc12b83
1 changed files with 58 additions and 70 deletions
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128
common/openpgp-oid.c
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@ -37,6 +37,30 @@
#include "util.h"
/* A table with all our supported OpenPGP curves. */
static struct {
const char *name; /* Standard name. */
const char *oidstr; /* IETF formatted OID. */
unsigned int nbits; /* Nominla bit length of the curve. */
const char *alias; /* NULL or alternative name of the curve. */
} oidtable[] = {
{ "Ed25519", "1.3.6.1.4.1.11591.15.1", 255, "ed25519" },
{ "NIST P-256", "1.2.840.10045.3.1.7", 256, "nistp256" },
{ "NIST P-384", "1.3.132.0.34", 384, "nistp384" },
{ "NIST P-521", "1.3.132.0.35", 521, "nistp521" },
{ "brainpoolP256r1", "1.3.36.3.3.2.8.1.1.7", 256 },
{ "brainpoolP384r1", "1.3.36.3.3.2.8.1.1.11", 384 },
{ "brainpoolP512r1", "1.3.36.3.3.2.8.1.1.13", 512 },
{ "secp256k1", "1.3.132.0.10", 256 },
{ NULL, NULL, 0}
};
/* The OID for Curve Ed25519 in OpenPGP format. */
static const char oid_ed25519[] =
{ 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01 };
@ -270,56 +294,33 @@ openpgp_oid_is_ed25519 (gcry_mpi_t a)
const char *
openpgp_curve_to_oid (const char *name, unsigned int *r_nbits)
{
int i;
unsigned int nbits = 0;
const char *oidstr;
const char *oidstr = NULL;
if (!name)
oidstr = NULL;
else if (!strcmp (name, "Ed25519") || !strcmp (name, "ed25519"))
if (name)
{
oidstr = "1.3.6.1.4.1.11591.15.1";
nbits = 255;
for (i=0; oidtable[i].name; i++)
if (!strcmp (oidtable[i].name, name)
|| (oidtable[i].alias && !strcmp (oidtable[i].alias, name)))
{
oidstr = oidtable[i].oidstr;
nbits = oidtable[i].nbits;
break;
}
if (!oidtable[i].name)
{
/* If not found assume the input is already an OID and check
whether we support it. */
for (i=0; oidtable[i].name; i++)
if (!strcmp (name, oidtable[i].oidstr))
{
oidstr = oidtable[i].oidstr;
nbits = oidtable[i].nbits;
break;
}
}
}
else if (!strcmp (name, "nistp256") || !strcmp (name, "NIST P-256"))
{
/* Libgcrypt uses "NIST P-256" as standard name for this curve
and thus the key generation returns this value. Thus we
allow both strings. */
oidstr = "1.2.840.10045.3.1.7";
nbits = 256;
}
else if (!strcmp (name, "nistp384") || !strcmp (name, "NIST P-384"))
{
oidstr = "1.3.132.0.34";
nbits = 384;
}
else if (!strcmp (name, "nistp521") || !strcmp (name, "NIST P-521"))
{
oidstr = "1.3.132.0.35";
nbits = 521;
}
else if (!strcmp (name,"brainpoolP256r1"))
{
oidstr = "1.3.36.3.3.2.8.1.1.7";
nbits = 256;
}
else if (!strcmp (name, "brainpoolP384r1"))
{
oidstr = "1.3.36.3.3.2.8.1.1.11";
nbits = 384;
}
else if (!strcmp (name, "brainpoolP512r1"))
{
oidstr = "1.3.36.3.3.2.8.1.1.13";
nbits = 512;
}
else if (!strcmp (name, "secp256k1"))
{
oidstr = "1.3.132.0.10";
nbits = 256;
}
else
oidstr = NULL;
if (r_nbits)
*r_nbits = nbits;
@ -328,32 +329,19 @@ openpgp_curve_to_oid (const char *name, unsigned int *r_nbits)
/* Map an OpenPGP OID to the Libgcrypt curve NAME. Returns "?" for
unknown curve names. */
unknown curve names. We prefer an alias name here which is more
suitable for printing. */
const char *
openpgp_oid_to_curve (const char *oid)
openpgp_oid_to_curve (const char *oidstr)
{
const char *name;
int i;
if (!oid)
name = "";
else if (!strcmp (oid, "1.3.6.1.4.1.11591.15.1"))
name = "ed25519";
else if (!strcmp (oid, "1.2.840.10045.3.1.7"))
name = "nistp256";
else if (!strcmp (oid, "1.3.132.0.10"))
name = "secp256k1";
else if (!strcmp (oid, "1.3.132.0.34"))
name = "nistp384";
else if (!strcmp (oid, "1.3.132.0.35"))
name = "nistp521";
else if (!strcmp (oid, "1.3.36.3.3.2.8.1.1.7"))
name = "brainpoolP256r1";
else if (!strcmp (oid, "1.3.36.3.3.2.8.1.1.11"))
name = "brainpoolP384r1";
else if (!strcmp (oid, "1.3.36.3.3.2.8.1.1.13"))
name = "brainpoolP512r1";
else
name = "?";
if (!oidstr)
return "";
return name;
for (i=0; oidtable[i].name; i++)
if (!strcmp (oidtable[i].oidstr, oidstr))
return oidtable[i].alias? oidtable[i].alias : oidtable[i].name;
return "?";
}