From b5112ff67f3dd5bb263f5ca6283f170906acaab6 Mon Sep 17 00:00:00 2001 From: Matthias Schiffer Date: Wed, 20 Nov 2013 01:51:12 +0100 Subject: Slightly simplify method/cipher/MAC definitions --- src/methods/generic_poly1305/generic_poly1305.c | 41 ++++++++----------------- 1 file changed, 13 insertions(+), 28 deletions(-) (limited to 'src/methods/generic_poly1305') diff --git a/src/methods/generic_poly1305/generic_poly1305.c b/src/methods/generic_poly1305/generic_poly1305.c index fdad118..588e294 100644 --- a/src/methods/generic_poly1305/generic_poly1305.c +++ b/src/methods/generic_poly1305/generic_poly1305.c @@ -30,7 +30,7 @@ #include -#define AUTHBLOCKS (block_count(crypto_onetimeauth_poly1305_KEYBYTES, sizeof(fastd_block128_t))) +#define AUTHBLOCKS 2 struct fastd_method_session_state { @@ -39,7 +39,6 @@ struct fastd_method_session_state { const fastd_cipher_t *cipher; const fastd_cipher_context_t *cipher_ctx; fastd_cipher_state_t *cipher_state; - size_t ivlen; }; @@ -74,26 +73,13 @@ static size_t method_max_packet_size(fastd_context_t *ctx) { return (fastd_max_packet_size(ctx) + COMMON_HEADBYTES + crypto_onetimeauth_poly1305_BYTES); } -static size_t method_min_encrypt_head_space(fastd_context_t *ctx UNUSED) { - return AUTHBLOCKS*sizeof(fastd_block128_t); -} - -static size_t method_min_decrypt_head_space(fastd_context_t *ctx UNUSED) { - return AUTHBLOCKS*sizeof(fastd_block128_t) - crypto_onetimeauth_poly1305_BYTES; -} - -static size_t method_min_tail_space(fastd_context_t *ctx UNUSED) { - return (sizeof(fastd_block128_t)-1); -} - - 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)) exit_bug(ctx, "generic-poly1305: can't get cipher key length"); - return cipher->key_length(ctx, cctx); + return cipher->key_length; } static fastd_method_session_state_t* method_session_init(fastd_context_t *ctx, const char *name, const uint8_t *secret, bool initiator) { @@ -106,8 +92,7 @@ static fastd_method_session_state_t* method_session_init(fastd_context_t *ctx, c session->cipher_state = session->cipher->init_state(ctx, session->cipher_ctx, secret); - session->ivlen = session->cipher->iv_length(ctx, session->cipher_state); - if (session->ivlen <= COMMON_NONCEBYTES) + if (session->cipher->iv_length <= COMMON_NONCEBYTES) exit_bug(ctx, "generic-poly1305: iv_length to small"); return session; @@ -146,10 +131,10 @@ 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->ivlen]; - memset(nonce, 0, session->ivlen); + uint8_t nonce[session->cipher->iv_length]; + memset(nonce, 0, session->cipher->iv_length); memcpy(nonce, session->common.send_nonce, COMMON_NONCEBYTES); - nonce[session->ivlen-1] = 1; + nonce[session->cipher->iv_length-1] = 1; int n_blocks = block_count(in.len, sizeof(fastd_block128_t)); @@ -193,10 +178,10 @@ 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->ivlen]; - memset(nonce, 0, session->ivlen); + uint8_t nonce[session->cipher->iv_length]; + memset(nonce, 0, session->cipher->iv_length); memcpy(nonce, in.data, COMMON_NONCEBYTES); - nonce[session->ivlen-1] = 1; + nonce[session->cipher->iv_length-1] = 1; int64_t age; if (!fastd_method_is_nonce_valid(ctx, &session->common, nonce, &age)) @@ -255,10 +240,10 @@ const fastd_method_t fastd_method_generic_poly1305 = { .provides = method_provides, .max_packet_size = method_max_packet_size, - .min_encrypt_head_space = method_min_encrypt_head_space, - .min_decrypt_head_space = method_min_decrypt_head_space, - .min_encrypt_tail_space = method_min_tail_space, - .min_decrypt_tail_space = method_min_tail_space, + .min_encrypt_head_space = AUTHBLOCKS*sizeof(fastd_block128_t), + .min_decrypt_head_space = AUTHBLOCKS*sizeof(fastd_block128_t) - crypto_onetimeauth_poly1305_BYTES, + .min_encrypt_tail_space = sizeof(fastd_block128_t)-1, + .min_decrypt_tail_space = sizeof(fastd_block128_t)-1, .key_length = method_key_length, .session_init = method_session_init, -- cgit v1.2.3