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scd: Don't inhibit SSH authentication for larger data if it can.

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* scd/app-openpgp.c (do_auth): Use command chaining if available.

--

Cherry-picked from master branch of:
	e8fb8e2b3e

GnuPG-bug-id: 5935
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2022-04-22 11:50:19 +09:00
parent 3777bc6528
commit 07e43eda8d
1 changed files with 5 additions and 0 deletions
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5
scd/app-openpgp.c
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@ -4738,6 +4738,11 @@ do_auth (app_t app, ctrl_t ctrl, const char *keyidstr,
exmode = 1; /* Use extended length. */
le_value = app->app_local->keyattr[2].rsa.n_bits / 8;
}
else if (app->app_local->cardcap.cmd_chaining && indatalen > 254)
{
exmode = -254; /* Command chaining with max. 254 bytes. */
le_value = 0;
}
else if (indatalen > 255)
{
if (!app->app_local->cardcap.ext_lc_le)