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common: New function to extract Q from an ECC key.

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* common/sexputil.c (get_ecc_q_from_canon_sexp): New.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2020-05-19 14:28:40 +02:00
parent 6dc3846d78
commit 3cd9dac7e0
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GPG key ID: E3FDFF218E45B72B
2 changed files with 93 additions and 1 deletions
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common/util.h
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@ -197,6 +197,10 @@ 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);
int get_pk_algo_from_key (gcry_sexp_t key);
int get_pk_algo_from_canon_sexp (const unsigned char *keydata,