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gpg: Remove the extra prompt for Curve25519.

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* g10/keygen.c (MY_USE_ECDSADH): New macro local to ask_curve.
(ask_curve): Use a fixed table of curve names and reserve a slot for
Curve448.  Simplify CurveNNNN/EdNNNN switching.
(ask_curve): Remove the Curve25519 is non-standard prompt.
--

Given that ECC generation is only available in export mode and that
gpg will in any case support our current ed2559/cv25519 definition the
extra prompt does not make anymore sense.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2016-03-22 19:55:25 +01:00
parent af9a4afbf0
commit 7f919063d3
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 30 additions and 34 deletions
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64
g10/keygen.c
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@ -2143,26 +2143,32 @@ ask_keysize (int algo, unsigned int primary_keysize)
static char *
ask_curve (int *algo, int *subkey_algo)
{
/* NB: We always use a complete algo list so that we have stable
numbers in the menu regardless on how Gpg was configured. */
struct {
const char *name;
int available;
int available; /* Available in Libycrypt (runtime checked) */
int expert_only;
int fix_curve;
const char* eddsa_curve; /* Corresponding EdDSA curve. */
const char *pretty_name;
int supported; /* Supported by gpg. */
} curves[] = {
#if GPG_USE_EDDSA
{ "Curve25519", 0, 0, 1, "Curve 25519" },
#endif
#if GPG_USE_ECDSA || GPG_USE_ECDH
{ "NIST P-256", 0, 1, 0, },
{ "NIST P-384", 0, 0, 0, },
{ "NIST P-521", 0, 1, 0, },
{ "brainpoolP256r1", 0, 1, 0, "Brainpool P-256" },
{ "brainpoolP384r1", 0, 1, 0, "Brainpool P-384" },
{ "brainpoolP512r1", 0, 1, 0, "Brainpool P-512" },
{ "secp256k1", 0, 1, 0 },
# define MY_USE_ECDSADH 1
#else
# define MY_USE_ECDSADH 0
#endif
{ "Curve25519", 0, 0, "Ed25519", "Curve 25519", GPG_USE_EDDSA },
{ "Curve448", 0, 1, "Ed448", "Curve 448", 0/*reserved*/ },
{ "NIST P-256", 0, 1, NULL, NULL, MY_USE_ECDSADH },
{ "NIST P-384", 0, 0, NULL, NULL, MY_USE_ECDSADH },
{ "NIST P-521", 0, 1, NULL, NULL, MY_USE_ECDSADH },
{ "brainpoolP256r1", 0, 1, NULL, "Brainpool P-256", MY_USE_ECDSADH },
{ "brainpoolP384r1", 0, 1, NULL, "Brainpool P-384", MY_USE_ECDSADH },
{ "brainpoolP512r1", 0, 1, NULL, "Brainpool P-512", MY_USE_ECDSADH },
{ "secp256k1", 0, 1, NULL, NULL, MY_USE_ECDSADH },
};
#undef MY_USE_ECDSADH
int idx;
char *answer;
char *result = NULL;
@ -2170,32 +2176,32 @@ ask_curve (int *algo, int *subkey_algo)
tty_printf (_("Please select which elliptic curve you want:\n"));
again:
keyparms = NULL;
for (idx=0; idx < DIM(curves); idx++)
{
int rc;
curves[idx].available = 0;
if (!curves[idx].supported)
continue;
if (!opt.expert && curves[idx].expert_only)
continue;
/* FIXME: The strcmp below is a temporary hack during
development. It shall be removed as soon as we have proper
Curve25519 support in Libgcrypt. */
/* We need to switch from the ECDH name of the curve to the
EDDSA name of the curve if we want a signing key. */
gcry_sexp_release (keyparms);
rc = gcry_sexp_build (&keyparms, NULL,
"(public-key(ecc(curve %s)))",
(!strcmp (curves[idx].name, "Curve25519")
? "Ed25519" : curves[idx].name));
curves[idx].eddsa_curve? curves[idx].eddsa_curve
/**/ : curves[idx].name);
if (rc)
continue;
if (!gcry_pk_get_curve (keyparms, 0, NULL))
continue;
if (subkey_algo && curves[idx].fix_curve)
if (subkey_algo && curves[idx].eddsa_curve)
{
/* Both Curve 25519 keys are to be created. Check that
Libgcrypt also supports the real Curve25519. */
/* Both Curve 25519 (or 448) keys are to be created. Check that
Libgcrypt also supports the real Curve25519 (or 448). */
gcry_sexp_release (keyparms);
rc = gcry_sexp_build (&keyparms, NULL,
"(public-key(ecc(curve %s)))",
@ -2242,25 +2248,15 @@ ask_curve (int *algo, int *subkey_algo)
tty_printf (_("Invalid selection.\n"));
else
{
if (curves[idx].fix_curve)
{
log_info ("WARNING: Curve25519 is not yet part of the"
" OpenPGP standard.\n");
if (!cpr_get_answer_is_yes("experimental_curve.override",
"Use this curve anyway? (y/N) ") )
goto again;
}
/* If the user selected a signing algorithm and Curve25519
we need to update the algo and and the curve name. */
we need to set the algo to EdDSA and update the curve name. */
if ((*algo == PUBKEY_ALGO_ECDSA || *algo == PUBKEY_ALGO_EDDSA)
&& curves[idx].fix_curve)
&& curves[idx].eddsa_curve)
{
if (subkey_algo && *subkey_algo == PUBKEY_ALGO_ECDSA)
*subkey_algo = PUBKEY_ALGO_EDDSA;
*algo = PUBKEY_ALGO_EDDSA;
result = xstrdup ("Ed25519");
result = xstrdup (curves[idx].eddsa_curve);
}
else
result = xstrdup (curves[idx].name);