diff options
| author | Dr. Stephen Henson <steve@openssl.org> | 2009-11-02 13:37:17 +0000 |
|---|---|---|
| committer | Dr. Stephen Henson <steve@openssl.org> | 2009-11-02 13:37:17 +0000 |
| commit | 23b97c6bb592c61d6c3e78e05968ac1dd0dda195 (patch) | |
| tree | 9364a48146e59717f3486d54f5a9945db1780670 /ssl/d1_both.c | |
| parent | 4a7f7171f5dbaa4cbab2d3768a2c93e96a9dcdb5 (diff) | |
PR: 2089
Submitted by: Robin Seggelmann <seggelmann@fh-muenster.de>
Approved by: steve@openssl.org
DTLS Fragment size bug fix.
Diffstat (limited to 'ssl/d1_both.c')
| -rw-r--r-- | ssl/d1_both.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/ssl/d1_both.c b/ssl/d1_both.c index ffc8ffe5d5..c1b0720bbf 100644 --- a/ssl/d1_both.c +++ b/ssl/d1_both.c @@ -177,7 +177,7 @@ int dtls1_do_write(SSL *s, int type) { int ret; int curr_mtu; - unsigned int len, frag_off; + unsigned int len, frag_off, mac_size, blocksize; /* AHA! Figure out the MTU, and stick to the right size */ if ( ! (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)) @@ -225,11 +225,22 @@ int dtls1_do_write(SSL *s, int type) OPENSSL_assert(s->init_num == (int)s->d1->w_msg_hdr.msg_len + DTLS1_HM_HEADER_LENGTH); + if (s->write_hash) + mac_size = EVP_MD_CTX_size(s->write_hash); + else + mac_size = 0; + + if (s->enc_write_ctx && + (EVP_CIPHER_mode( s->enc_write_ctx->cipher) & EVP_CIPH_CBC_MODE)) + blocksize = 2 * EVP_CIPHER_block_size(s->enc_write_ctx->cipher); + else + blocksize = 0; + frag_off = 0; while( s->init_num) { curr_mtu = s->d1->mtu - BIO_wpending(SSL_get_wbio(s)) - - DTLS1_RT_HEADER_LENGTH; + DTLS1_RT_HEADER_LENGTH - mac_size - blocksize; if ( curr_mtu <= DTLS1_HM_HEADER_LENGTH) { @@ -237,7 +248,8 @@ int dtls1_do_write(SSL *s, int type) ret = BIO_flush(SSL_get_wbio(s)); if ( ret <= 0) return ret; - curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH; + curr_mtu = s->d1->mtu - DTLS1_RT_HEADER_LENGTH - + mac_size - blocksize; } if ( s->init_num > curr_mtu) |