diff options
| -rw-r--r-- | common/sexputil.c | 58 | ||||
| -rw-r--r-- | common/util.h | 1 |
2 files changed, 59 insertions, 0 deletions
diff --git a/common/sexputil.c b/common/sexputil.c index f30790aa1..5e51f68f2 100644 --- a/common/sexputil.c +++ b/common/sexputil.c @@ -577,3 +577,61 @@ get_pk_algo_from_canon_sexp (const unsigned char *keydata, size_t keydatalen) gcry_sexp_release (sexp); return algo; } + + +/* Given the public key S_PKEY, return a new buffer with a descriptive + * string for its algorithm. This function may return NULL on memory + * error. */ +char * +pubkey_algo_string (gcry_sexp_t s_pkey) +{ + const char *prefix; + gcry_sexp_t l1; + char *algoname; + int algo; + char *result; + + l1 = gcry_sexp_find_token (s_pkey, "public-key", 0); + if (!l1) + return xtrystrdup ("E_no_key"); + { + gcry_sexp_t l_tmp = gcry_sexp_cadr (l1); + gcry_sexp_release (l1); + l1 = l_tmp; + } + algoname = gcry_sexp_nth_string (l1, 0); + gcry_sexp_release (l1); + if (!algoname) + return xtrystrdup ("E_no_algo"); + + algo = gcry_pk_map_name (algoname); + switch (algo) + { + case GCRY_PK_RSA: prefix = "rsa"; break; + case GCRY_PK_ELG: prefix = "elg"; break; + case GCRY_PK_DSA: prefix = "dsa"; break; + case GCRY_PK_ECC: prefix = ""; break; + default: prefix = NULL; break; + } + + if (prefix && *prefix) + result = xtryasprintf ("%s%u", prefix, gcry_pk_get_nbits (s_pkey)); + else if (prefix) + { + const char *curve = gcry_pk_get_curve (s_pkey, 0, NULL); + const char *name = openpgp_oid_to_curve + (openpgp_curve_to_oid (curve, NULL), 0); + + if (name) + result = xtrystrdup (name); + else if (curve) + result = xtryasprintf ("X_%s", curve); + else + result = xtrystrdup ("E_unknown"); + } + else + result = xtryasprintf ("X_algo_%d", algo); + + xfree (algoname); + return result; +} diff --git a/common/util.h b/common/util.h index 36f1b93a4..27f565bab 100644 --- a/common/util.h +++ b/common/util.h @@ -199,6 +199,7 @@ gpg_error_t get_rsa_pk_from_canon_sexp (const unsigned char *keydata, int get_pk_algo_from_key (gcry_sexp_t key); int get_pk_algo_from_canon_sexp (const unsigned char *keydata, size_t keydatalen); +char *pubkey_algo_string (gcry_sexp_t s_pkey); /*-- convert.c --*/ int hex2bin (const char *string, void *buffer, size_t length); |