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common: New function get_keyalgo_string.

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* common/openpgp-oid.c (struct keyalgo_string_s): New.
(keyalgo_strings): New.
(keyalgo_strings_size, keyalgo_strings_used): New.
(openpgp_oid_or_name_to_curve): New.
(get_keyalgo_string): New.
--

This function is intended as a more general version of gpg's
pubkey_string function.  It has the advantage to avoid mallocs and
uses static table of algorithm strings instead.  There should be only
a few dozen of such strings (if at all) and thus all those allocations
we do internally in gpg's pubkey_string and the static buffers all
over the place are not too nice.

Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 3a1fa13eed)
(cherry picked from commit 332a72f734)
This commit is contained in:
Werner Koch 2020-02-10 00:31:07 +01:00
parent 398cec3ac7
commit 2e39fed109
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GPG key ID: E3FDFF218E45B72B
4 changed files with 240 additions and 6 deletions
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3
common/util.h
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@ -248,9 +248,12 @@ int openpgp_oid_is_cv25519 (gcry_mpi_t a);
const char *openpgp_curve_to_oid (const char *name,
unsigned int *r_nbits, int *r_algo);
const char *openpgp_oid_to_curve (const char *oid, int canon);
const char *openpgp_oid_or_name_to_curve (const char *oidname, int canon);
const char *openpgp_enum_curves (int *idxp);
const char *openpgp_is_curve_supported (const char *name,
int *r_algo, unsigned int *r_nbits);
const char *get_keyalgo_string (enum gcry_pk_algos algo,
unsigned int nbits, const char *curve);
/*-- homedir.c --*/