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authorMatthias Schiffer <mschiffer@universe-factory.net>2013-11-25 23:18:11 +0100
committerMatthias Schiffer <mschiffer@universe-factory.net>2013-11-25 23:18:11 +0100
commitc62a0f592c49b41d393fae580ce9f1293ee7a16d (patch)
tree6d8ef6b7c93fdcaa0fd1bcd590dba531ef8b5140 /src/methods/generic_gmac
parent60c2c11de820687887a643344fc1b0a91fd45226 (diff)
downloadfastd-c62a0f592c49b41d393fae580ce9f1293ee7a16d.tar
fastd-c62a0f592c49b41d393fae580ce9f1293ee7a16d.zip
Move crypto algorithm information out of implementation
Diffstat (limited to 'src/methods/generic_gmac')
-rw-r--r--src/methods/generic_gmac/generic_gmac.c56
1 files changed, 35 insertions, 21 deletions
diff --git a/src/methods/generic_gmac/generic_gmac.c b/src/methods/generic_gmac/generic_gmac.c
index 03377c5..86c02f7 100644
--- a/src/methods/generic_gmac/generic_gmac.c
+++ b/src/methods/generic_gmac/generic_gmac.c
@@ -31,18 +31,20 @@
struct fastd_method_session_state {
fastd_method_common_t common;
+ const fastd_cipher_info_t *cipher_info;
const fastd_cipher_t *cipher;
const fastd_cipher_context_t *cipher_ctx;
fastd_cipher_state_t *cipher_state;
+ const fastd_mac_info_t *ghash_info;
const fastd_mac_t *ghash;
const fastd_mac_context_t *ghash_ctx;
fastd_mac_state_t *ghash_state;
};
-static bool cipher_get(fastd_context_t *ctx, const char *name, const fastd_cipher_t **cipher, const fastd_cipher_context_t **cctx) {
- if (!fastd_mac_available("ghash"))
+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) {
+ if (!fastd_mac_info_get_by_name("ghash"))
return false;
size_t len = strlen(name);
@@ -60,27 +62,39 @@ static bool cipher_get(fastd_context_t *ctx, const char *name, const fastd_ciphe
memcpy(cipher_name, name, len-5);
cipher_name[len-5] = 0;
+ const fastd_cipher_info_t *info = NULL;
+
if (ctx) {
- *cipher = fastd_cipher_get_by_name(ctx, cipher_name, cctx);
- return *cipher;
+ *cipher = fastd_cipher_get_by_name(ctx, cipher_name, &info, cctx);
+ if (!*cipher)
+ return false;
}
else {
- return fastd_cipher_available(cipher_name);
+ info = fastd_cipher_info_get_by_name(cipher_name);
+ if (!info)
+ return false;
}
+
+ if (info->iv_length <= COMMON_NONCEBYTES)
+ return false;
+
+ if (cipher_info)
+ *cipher_info = info;
+
+ return true;
}
static bool method_provides(const char *name) {
- return cipher_get(NULL, name, NULL, NULL);
+ return cipher_get(NULL, name, NULL, NULL, NULL);
}
static size_t method_key_length(fastd_context_t *ctx, const char *name) {
- const fastd_cipher_t *cipher = NULL;
- const fastd_cipher_context_t *cctx;
- if (!cipher_get(ctx, name, &cipher, &cctx))
+ const fastd_cipher_info_t *cipher_info;
+ if (!cipher_get(NULL, name, &cipher_info, NULL, NULL))
exit_bug(ctx, "generic-gmac: can't get cipher key length");
- return cipher->key_length;
+ return cipher_info->key_length;
}
static fastd_method_session_state_t* method_session_init(fastd_context_t *ctx, const char *name, const uint8_t *secret, bool initiator) {
@@ -88,7 +102,7 @@ static fastd_method_session_state_t* method_session_init(fastd_context_t *ctx, c
fastd_method_common_init(ctx, &session->common, initiator);
- if (!cipher_get(ctx, name, &session->cipher, &session->cipher_ctx))
+ if (!cipher_get(ctx, name, &session->cipher_info, &session->cipher, &session->cipher_ctx))
exit_bug(ctx, "generic-gmac: can't instanciate cipher");
session->cipher_state = session->cipher->init_state(ctx, session->cipher_ctx, secret);
@@ -96,15 +110,15 @@ static fastd_method_session_state_t* method_session_init(fastd_context_t *ctx, c
static const fastd_block128_t zeroblock = {};
fastd_block128_t H;
- if (session->cipher->iv_length <= COMMON_NONCEBYTES)
+ if (session->cipher_info->iv_length <= COMMON_NONCEBYTES)
exit_bug(ctx, "generic-gmac: iv_length to small");
- uint8_t zeroiv[session->cipher->iv_length];
- memset(zeroiv, 0, session->cipher->iv_length);
+ uint8_t zeroiv[session->cipher_info->iv_length];
+ memset(zeroiv, 0, session->cipher_info->iv_length);
session->cipher->crypt(ctx, session->cipher_state, &H, &zeroblock, sizeof(fastd_block128_t), zeroiv);
- session->ghash = fastd_mac_get_by_name(ctx, "ghash", &session->ghash_ctx);
+ session->ghash = fastd_mac_get_by_name(ctx, "ghash", &session->ghash_info, &session->ghash_ctx);
if (!session->ghash)
exit_bug(ctx, "generic-gmac: can't instanciate ghash mac");
@@ -164,10 +178,10 @@ static bool method_encrypt(fastd_context_t *ctx, fastd_peer_t *peer UNUSED, fast
if (tail_len)
memset(in.data+in.len, 0, tail_len);
- uint8_t nonce[session->cipher->iv_length];
- memset(nonce, 0, session->cipher->iv_length);
+ uint8_t nonce[session->cipher_info->iv_length];
+ memset(nonce, 0, session->cipher_info->iv_length);
memcpy(nonce, session->common.send_nonce, COMMON_NONCEBYTES);
- nonce[session->cipher->iv_length-1] = 1;
+ nonce[session->cipher_info->iv_length-1] = 1;
int n_blocks = block_count(in.len, sizeof(fastd_block128_t));
@@ -217,10 +231,10 @@ static bool method_decrypt(fastd_context_t *ctx, fastd_peer_t *peer, fastd_metho
if (((const uint8_t*)in.data)[COMMON_NONCEBYTES]) /* flags */
return false;
- uint8_t nonce[session->cipher->iv_length];
- memset(nonce, 0, session->cipher->iv_length);
+ uint8_t nonce[session->cipher_info->iv_length];
+ memset(nonce, 0, session->cipher_info->iv_length);
memcpy(nonce, in.data, COMMON_NONCEBYTES);
- nonce[session->cipher->iv_length-1] = 1;
+ nonce[session->cipher_info->iv_length-1] = 1;
int64_t age;
if (!fastd_method_is_nonce_valid(ctx, &session->common, nonce, &age))