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experiment: Add forgotten open-misc.c.

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Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2021-10-08 22:07:14 +09:00
parent 7b0a7c7148
commit f2b54b3309
1 changed files with 61 additions and 0 deletions
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61
common/openpgp-misc.c Normal file
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#include <config.h>
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include <assert.h>
#include "util.h"
#include "openpgpdefs.h"
gcry_mpi_t
openpgp_ecc_parse_pubkey (pubkey_algo_t pkalgo, const char *curve_oid,
gcry_mpi_t pubkey)
{
unsigned int nbits = 0;
unsigned char *buf = NULL;
const char *curve = openpgp_oid_to_curve (curve_oid, 1);
if (curve == NULL)
curve = curve_oid;
if ((pkalgo == PUBKEY_ALGO_EDDSA && !strcmp (curve, "Ed448"))
|| (pkalgo == PUBKEY_ALGO_ECDH && !strcmp (curve, "X448")))
buf = gcry_mpi_get_opaque (pubkey, &nbits);
if (nbits == 0
|| (pkalgo == PUBKEY_ALGO_EDDSA && (nbits+7)/8 == (448 + 8)/8)
|| (pkalgo == PUBKEY_ALGO_ECDH && (nbits+7)/8 == 448/8))
return gcry_mpi_copy (pubkey);
if (pkalgo == PUBKEY_ALGO_EDDSA)
return gcry_mpi_set_opaque_copy (NULL, buf+1, 8 + 448);
else
return gcry_mpi_set_opaque_copy (NULL, buf+1, 448);
}
gcry_mpi_t
openpgp_ecc_parse_seckey (pubkey_algo_t pkalgo, const char *curve_oid,
gcry_mpi_t seckey)
{
unsigned int nbits = 0;
unsigned char *buf = NULL;
const char *curve = openpgp_oid_to_curve (curve_oid, 1);
if (curve == NULL)
curve = curve_oid;
if ((pkalgo == PUBKEY_ALGO_EDDSA && !strcmp (curve, "Ed448"))
|| (pkalgo == PUBKEY_ALGO_ECDH && !strcmp (curve, "X448")))
buf = gcry_mpi_get_opaque (seckey, &nbits);
if (nbits == 0
|| (pkalgo == PUBKEY_ALGO_EDDSA && (nbits+7)/8 == (448 + 8)/8)
|| (pkalgo == PUBKEY_ALGO_ECDH && (nbits+7)/8 == 448/8))
return gcry_mpi_copy (seckey);
if (pkalgo == PUBKEY_ALGO_EDDSA)
return gcry_mpi_set_opaque_copy (NULL, buf+1, 8 + 448);
else
return gcry_mpi_set_opaque_copy (NULL, buf+1, 448);
}