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gpg: Prepare to accept shorter OIDs for ed25519 and cv25519. 

* common/openpgp-oid.c (oidtable): Add them.
(oid_ed25519_v5, oid_cv25519_v5): New.
(openpgp_oidbuf_is_ed25519): Take new OID in account.
(openpgp_oidbuf_is_cv25519): Ditto.
--

ed25519 is used in GnuPG and other implementations since 2015 and thus
we can't simply switch to the shorter OIDs.  However, we have not
widely used them with v5 keys (only ed448 forced the use of v5) and
thus it might be possible to use the new OIDs with v5 keys.

Note that Libgcrypt supports the new OIDs even in 1.8.
This commit is contained in:
Werner Koch 2023-02-21 12:14:31 +01:00
parent 3d094e2bcf
commit 71c11c20f4
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 20 additions and 6 deletions
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26
common/openpgp-oid.c
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@ -48,6 +48,8 @@ static struct {
{ "Curve25519", "1.3.6.1.4.1.3029.1.5.1", 255, "cv25519", PUBKEY_ALGO_ECDH },
{ "Ed25519", "1.3.6.1.4.1.11591.15.1", 255, "ed25519", PUBKEY_ALGO_EDDSA },
{ "Curve25519", "1.3.101.110", 255, "cv25519", PUBKEY_ALGO_ECDH },
{ "Ed25519", "1.3.101.112", 255, "ed25519", PUBKEY_ALGO_EDDSA },
{ "X448", "1.3.101.111", 448, "cv448", PUBKEY_ALGO_ECDH },
{ "Ed448", "1.3.101.113", 456, "ed448", PUBKEY_ALGO_EDDSA },
@ -65,13 +67,17 @@ static struct {
};
/* The OID for Curve Ed25519 in OpenPGP format. */
/* The OID for Curve Ed25519 in OpenPGP format. The shorter v5
* variant may only be used with v5 keys. */
static const char oid_ed25519[] =
{ 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01 };
static const char oid_ed25519_v5[] = { 0x03, 0x2b, 0x65, 0x70 };
/* The OID for Curve25519 in OpenPGP format. */
/* The OID for Curve25519 in OpenPGP format. The shorter v5
* variant may only be used with v5 keys. */
static const char oid_cv25519[] =
{ 0x0a, 0x2b, 0x06, 0x01, 0x04, 0x01, 0x97, 0x55, 0x01, 0x05, 0x01 };
static const char oid_cv25519_v5[] = { 0x03, 0x2b, 0x65, 0x6e };
/* The OID for X448 in OpenPGP format. */
/*
@ -321,8 +327,12 @@ openpgp_oid_to_str (gcry_mpi_t a)
int
openpgp_oidbuf_is_ed25519 (const void *buf, size_t len)
{
return (buf && len == DIM (oid_ed25519)
&& !memcmp (buf, oid_ed25519, DIM (oid_ed25519)));
if (!buf)
return 0;
return ((len == DIM (oid_ed25519)
&& !memcmp (buf, oid_ed25519, DIM (oid_ed25519)))
|| (len == DIM (oid_ed25519_v5)
&& !memcmp (buf, oid_ed25519_v5, DIM (oid_ed25519_v5))));
}
@ -345,8 +355,12 @@ openpgp_oid_is_ed25519 (gcry_mpi_t a)
int
openpgp_oidbuf_is_cv25519 (const void *buf, size_t len)
{
return (buf && len == DIM (oid_cv25519)
&& !memcmp (buf, oid_cv25519, DIM (oid_cv25519)));
if (!buf)
return 0;
return ((len == DIM (oid_cv25519)
&& !memcmp (buf, oid_cv25519, DIM (oid_cv25519)))
|| (len == DIM (oid_cv25519_v5)
&& !memcmp (buf, oid_cv25519_v5, DIM (oid_cv25519_v5))));
}