From d0707b161d10cf79242d40b24853988c89c7604a Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Fri, 29 Nov 2013 22:15:58 +0100 Subject: crypto: separate cipher/MAC availability check from information request --- src/methods/composed_gmac/composed_gmac.c | 36 +++++++++++++------------------ 1 file changed, 15 insertions(+), 21 deletions(-) (limited to 'src/methods/composed_gmac') 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); -- cgit v1.2.3