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common: New function to uncompress an ECC public key.

Browse source 
* common/sexputil.c (ec2os): New.
(uncompress_ecc_q_in_canon_sexp): New.

* common/t-sexputil.c (fail2): new.
(test_ecc_uncompress): New.
(main): Run new test.
--

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 935765b451)
This commit is contained in:
Werner Koch 2021-04-29 12:31:14 +02:00
parent 473e649ea1
commit c825117c5f
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 593 additions and 1 deletions
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8
common/util.h
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@ -201,6 +201,14 @@ gpg_error_t get_rsa_pk_from_canon_sexp (const unsigned char *keydata,
size_t *r_nlen,
unsigned char const **r_e,
size_t *r_elen);
gpg_error_t get_ecc_q_from_canon_sexp (const unsigned char *keydata,
size_t keydatalen,
unsigned char const **r_q,
size_t *r_qlen);
gpg_error_t uncompress_ecc_q_in_canon_sexp (const unsigned char *keydata,
size_t keydatalen,
unsigned char **r_newkeydata,
size_t *r_newkeydatalen);
int get_pk_algo_from_key (gcry_sexp_t key);
int get_pk_algo_from_canon_sexp (const unsigned char *keydata,