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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-11-29 22:15:58 +0100
committerMatthias Schiffer <mschiffer@universe-factory.net>2013-11-29 22:15:58 +0100
commitd0707b161d10cf79242d40b24853988c89c7604a (patch)
tree2d7ebb6082708f49c17ec6385f6019b83be0dda6 /src/methods/composed_gmac
parent27c14deaedc8f914e82388e41e61e8adbfd13f35 (diff)
downloadfastd-d0707b161d10cf79242d40b24853988c89c7604a.tar
fastd-d0707b161d10cf79242d40b24853988c89c7604a.zip
crypto: separate cipher/MAC availability check from information request
Diffstat (limited to 'src/methods/composed_gmac')
-rw-r--r--src/methods/composed_gmac/composed_gmac.c36
1 files changed, 15 insertions, 21 deletions
diff --git a/src/methods/composed_gmac/composed_gmac.c b/src/methods/composed_gmac/composed_gmac.c
index b8ee2f6..870b82b 100644
--- a/src/methods/composed_gmac/composed_gmac.c
+++ b/src/methods/composed_gmac/composed_gmac.c
@@ -52,8 +52,9 @@ struct fastd_method_session_state {
static bool cipher_get(fastd_context_t *ctx, const char *name,
const fastd_cipher_info_t **cipher_info, const fastd_cipher_t **cipher, const fastd_cipher_context_t **cctx,
- const fastd_cipher_info_t **gmac_cipher_info, const fastd_cipher_t **gmac_cipher, const fastd_cipher_context_t **gmac_cctx) {
- if (!fastd_mac_info_get_by_name("ghash"))
+ const fastd_cipher_info_t **gmac_cipher_info, const fastd_cipher_t **gmac_cipher, const fastd_cipher_context_t **gmac_cctx,
+ bool check) {
+ if (check && !fastd_mac_is_available("ghash"))
return false;
size_t len = strlen(name);
@@ -76,28 +77,20 @@ static bool cipher_get(fastd_context_t *ctx, const char *name,
*gmac_cipher_name = 0;
gmac_cipher_name++;
- const fastd_cipher_info_t *info = NULL;
- const fastd_cipher_info_t *gmac_info = NULL;
+ if (check && (!fastd_cipher_is_available(cipher_name) || !fastd_cipher_is_available(gmac_cipher_name)))
+ return false;
if (ctx) {
- *cipher = fastd_cipher_get_by_name(ctx, cipher_name, &info, cctx);
- *gmac_cipher = fastd_cipher_get_by_name(ctx, gmac_cipher_name, &gmac_info, gmac_cctx);
- if (!(*cipher && *gmac_cipher))
- return false;
+ *cipher = fastd_cipher_get_by_name(ctx, cipher_name, cipher_info, cctx);
+ *gmac_cipher = fastd_cipher_get_by_name(ctx, gmac_cipher_name, gmac_cipher_info, gmac_cctx);
}
else {
- info = fastd_cipher_info_get_by_name(cipher_name);
- gmac_info = fastd_cipher_info_get_by_name(gmac_cipher_name);
- if (!(info && gmac_info))
- return false;
+ if (cipher_info)
+ *cipher_info = fastd_cipher_info_get_by_name(cipher_name);
+ if (gmac_cipher_info)
+ *gmac_cipher_info = fastd_cipher_info_get_by_name(gmac_cipher_name);
}
- if (cipher_info)
- *cipher_info = info;
-
- if (gmac_cipher_info)
- *gmac_cipher_info = gmac_info;
-
return true;
}
@@ -105,7 +98,7 @@ static bool cipher_get(fastd_context_t *ctx, const char *name,
static bool method_provides(const char *name) {
const fastd_cipher_info_t *gmac_cipher_info;
- if (!cipher_get(NULL, name, NULL, NULL, NULL, &gmac_cipher_info, NULL, NULL))
+ if (!cipher_get(NULL, name, NULL, NULL, NULL, &gmac_cipher_info, NULL, NULL, true))
return false;
if (gmac_cipher_info->iv_length <= COMMON_NONCEBYTES)
@@ -118,7 +111,7 @@ static size_t method_key_length(fastd_context_t *ctx, const char *name) {
const fastd_cipher_info_t *cipher_info;
const fastd_cipher_info_t *gmac_cipher_info;
- if (!cipher_get(NULL, name, &cipher_info, NULL, NULL, &gmac_cipher_info, NULL, NULL))
+ if (!cipher_get(NULL, name, &cipher_info, NULL, NULL, &gmac_cipher_info, NULL, NULL, false))
exit_bug(ctx, "composed-gmac: can't get cipher key length");
return cipher_info->key_length + gmac_cipher_info->key_length;
@@ -131,7 +124,8 @@ static fastd_method_session_state_t* method_session_init(fastd_context_t *ctx, c
if (!cipher_get(ctx, name,
&session->cipher_info, &session->cipher, &session->cipher_ctx,
- &session->gmac_cipher_info, &session->gmac_cipher, &session->gmac_cipher_ctx))
+ &session->gmac_cipher_info, &session->gmac_cipher, &session->gmac_cipher_ctx,
+ false))
exit_bug(ctx, "composed-gmac: can't instanciate cipher");
session->cipher_state = session->cipher->init_state(ctx, session->cipher_ctx, secret);