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common:kem: Factor out a function to retrieve ECC parameters.

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* common/util.h (struct gnupg_ecc_params, gnupg_get_ecc_params): New.
(ECC_SCALAR_LEN_MAX, ECC_POINT_LEN_MAX, ECC_HASH_LEN_MAX): New.
* agent/pkdecrypt.c (ecc_extract_pk_from_key, ecc_extract_sk_from_key):
Follow the change of gnupg_get_ecc_params.
(ecc_raw_kem, ecc_pgp_kem_decap, composite_pgp_kem_decrypt): Likewise.
(ecc_kem_decrypt): Likewise.
(get_ecc_params): Move to...
* common/kem.c (gnupg_get_ecc_params): ... here
* g10/pkglue.c (ECC_POINT_LEN_MAX, ECC_HASH_LEN_MAX): Remove duplicates.

--

GnuPG-bug-id: 7649
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2025-07-03 15:45:52 +09:00
parent a354018bf3
commit 5e623b71d5
No known key found for this signature in database
GPG key ID: 640114AF89DE6054
4 changed files with 104 additions and 112 deletions
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21
common/util.h
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@ -324,6 +324,27 @@ gpg_error_t gnupg_kem_combiner (void *kek, size_t kek_len,
const void *mlkem_ct, size_t mlkem_ct_len,
const void *fixedinfo, size_t fixedinfo_len);
/* ECC parameters for KEM encryption/decryption. */
struct gnupg_ecc_params
{
const char *curve; /* Canonical name of the curve. */
size_t pubkey_len; /* Pubkey length in the SEXP representation. */
size_t scalar_len;
size_t point_len;
int hash_algo; /* Hash algo when it's used for composite KEM. */
int kem_algo;
int scalar_reverse; /* Byte-oder is reverse. */
int may_have_prefix; /* Point representation may have prefix. */
};
const struct gnupg_ecc_params *gnupg_get_ecc_params (const char *curve);
/* Maximum buffer sizes required for ECC KEM. */
#define ECC_SCALAR_LEN_MAX 66
#define ECC_POINT_LEN_MAX (1+2*ECC_SCALAR_LEN_MAX)
#define ECC_HASH_LEN_MAX 64
/*-- miscellaneous.c --*/
/* This function is called at startup to tell libgcrypt to use our own