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scd: Rewrite READKEY to allow for compressed points.

* scd/app-help.c (app_help_pubkey_from_cert): New.  Taken from 2.3.
* scd/command.c (cmd_readkey): Rewrite using new helper.
--

Actually the readkey functions needs to return the uncompressed points
but if there is no readkey function, like in app-p15.c, readcert is
used and here we need to extract and the key and uncompress the point.

Noet that the --advanced flag did not and still does not work if the
key is fetched via readcert.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2021-04-29 16:05:19 +02:00
parent 7637d39fe2
commit 96577e2e46
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 75 additions and 43 deletions

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@ -211,6 +211,8 @@ gpg_error_t app_help_get_keygrip_string_pk (const void *pk, size_t pklen,
int *r_algo);
gpg_error_t app_help_get_keygrip_string (ksba_cert_t cert, char *hexkeygrip,
gcry_sexp_t *r_pkey, int *r_algo);
gpg_error_t app_help_pubkey_from_cert (const void *cert, size_t certlen,
unsigned char **r_pk, size_t *r_pklen);
size_t app_help_read_length_of_cert (int slot, int fid, size_t *r_certoff);