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Merge pull request #3408 from AndrzejKurek/hamming-distance-improvements

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Hamming distance improvements
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Andrzej Kurek 2020-06-22 08:28:55 +01:00 • committed by GitHub
commit e5425a0944
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 21 additions and 18 deletions
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8
library/ssl_tls.c
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@ -56,6 +56,8 @@
#include "mbedtls/oid.h"
#endif
#define PROPER_HS_FRAGMENT 0x75555555
#if defined(MBEDTLS_USE_TINYCRYPT)
static int uecc_rng_wrapper( uint8_t *dest, unsigned int size )
{
@ -4736,7 +4738,7 @@ static int ssl_hs_is_proper_fragment( mbedtls_ssl_context *ssl )
mbedtls_platform_memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
mbedtls_platform_memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 )
{
return( 1 );
return( PROPER_HS_FRAGMENT );
}
return( 0 );
}
@ -4929,7 +4931,7 @@ int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
* messages; the commonality is that both handshake fragments and
* future messages cannot be forwarded immediately to the
* handshake logic layer. */
if( ssl_hs_is_proper_fragment( ssl ) == 1 )
if( ssl_hs_is_proper_fragment( ssl ) == PROPER_HS_FRAGMENT )
{
MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
return( MBEDTLS_ERR_SSL_EARLY_MESSAGE );
@ -6053,7 +6055,7 @@ static int ssl_buffer_message( mbedtls_ssl_context *ssl )
size_t reassembly_buf_sz;
hs_buf->is_fragmented =
( ssl_hs_is_proper_fragment( ssl ) == 1 );
( ssl_hs_is_proper_fragment( ssl ) == PROPER_HS_FRAGMENT );
/* We copy the message back into the input buffer
* after reassembly, so check that it's not too large.