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gpg: Support exporting Ed448 SSH key.

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* common/openpgp-oid.c (oid_ed448, openpgp_oidbuf_is_ed448): New.
(openpgp_oid_is_ed448): New.
* common/util.h (openpgp_oid_is_ed448): New.
* g10/export.c (export_one_ssh_key): Support Ed448 key.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-03-22 16:57:18 +09:00
parent 0b45c5a994
commit 1524a942b6
3 changed files with 37 additions and 4 deletions
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28
common/openpgp-oid.c
View File

@ -83,6 +83,10 @@ static const char oid_cv25519[] =
*/
static const char oid_cv448[] = { 0x03, 0x2b, 0x65, 0x6f };
/* The OID for Ed448 in OpenPGP format. */
static const char oid_ed448[] = { 0x03, 0x2b, 0x65, 0x71 };
/* A table to store keyalgo strings like "rsa2048 or "ed25519" so that
* we do not need to allocate them. This is currently a simple array
* but may eventually be changed to a fast data structure. Noet that
@ -346,6 +350,15 @@ openpgp_oidbuf_is_cv25519 (const void *buf, size_t len)
}
/* Return true if (BUF,LEN) represents the OID for Ed448. */
static int
openpgp_oidbuf_is_ed448 (const void *buf, size_t len)
{
return (buf && len == DIM (oid_ed448)
&& !memcmp (buf, oid_ed448, DIM (oid_ed448)));
}
/* Return true if (BUF,LEN) represents the OID for X448. */
static int
openpgp_oidbuf_is_cv448 (const void *buf, size_t len)
@ -370,6 +383,21 @@ openpgp_oid_is_cv25519 (gcry_mpi_t a)
}
/* Return true if the MPI A represents the OID for Ed448. */
int
openpgp_oid_is_ed448 (gcry_mpi_t a)
{
const unsigned char *buf;
unsigned int nbits;
if (!a || !gcry_mpi_get_flag (a, GCRYMPI_FLAG_OPAQUE))
return 0;
buf = gcry_mpi_get_opaque (a, &nbits);
return openpgp_oidbuf_is_ed448 (buf, (nbits+7)/8);
}
/* Return true if the MPI A represents the OID for X448. */
int
openpgp_oid_is_cv448 (gcry_mpi_t a)

1
common/util.h
View File

@ -245,6 +245,7 @@ int openpgp_oid_is_ed25519 (gcry_mpi_t a);
int openpgp_oidbuf_is_cv25519 (const void *buf, size_t len);
int openpgp_oid_is_cv25519 (gcry_mpi_t a);
int openpgp_oid_is_cv448 (gcry_mpi_t a);
int openpgp_oid_is_ed448 (gcry_mpi_t a);
const char *openpgp_curve_to_oid (const char *name,
unsigned int *r_nbits, int *r_algo);
const char *openpgp_oid_to_curve (const char *oid, int canon);

12
g10/export.c
View File

@ -2195,7 +2195,6 @@ export_one_ssh_key (estream_t fp, PKT_public_key *pk)
gpg_error_t err;
const char *identifier = NULL;
membuf_t mb;
struct b64state b64_state;
void *blob;
size_t bloblen;
@ -2245,13 +2244,18 @@ export_one_ssh_key (estream_t fp, PKT_public_key *pk)
break;
case PUBKEY_ALGO_EDDSA:
if (!openpgp_oid_is_ed25519 (pk->pkey[0]))
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
else
if (openpgp_oid_is_ed25519 (pk->pkey[0]))
{
identifier = "ssh-ed25519";
err = key_to_sshblob (&mb, identifier, pk->pkey[1], NULL);
}
else if (openpgp_oid_is_ed448 (pk->pkey[0]))
{
identifier = "ssh-ed448";
err = key_to_sshblob (&mb, identifier, pk->pkey[1], NULL);
}
else
err = gpg_error (GPG_ERR_UNKNOWN_CURVE);
break;
case PUBKEY_ALGO_ELGAMAL_E: