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Add ssl_get_record_expansion()

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This commit is contained in:
Manuel Pégourié-Gonnard
2014-10-14 17:47:31 +02:00
committed by Paul Bakker
parent e63582a166
commit 9b35f18f66
4 changed files with 56 additions and 0 deletions
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34
library/ssl_tls.c
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@ -5476,6 +5476,40 @@ const char *ssl_get_version( const ssl_context *ssl )
}
}
int ssl_get_record_expansion( const ssl_context *ssl )
{
int transform_expansion;
const ssl_transform *transform = ssl->transform_out;
#if defined(POLARSSL_ZLIB_SUPPORT)
if( ssl->session_out->compression != SSL_COMPRESS_NULL )
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
#endif
if( transform == NULL )
return( ssl_hdr_len( ssl ) );
switch( cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
{
case POLARSSL_MODE_GCM:
case POLARSSL_MODE_CCM:
case POLARSSL_MODE_STREAM:
transform_expansion = transform->minlen;
break;
case POLARSSL_MODE_CBC:
transform_expansion = transform->maclen
+ cipher_get_block_size( &transform->cipher_ctx_enc );
break;
default:
SSL_DEBUG_MSG( 0, ( "should never happen" ) );
return( POLARSSL_ERR_SSL_INTERNAL_ERROR );
}
return( ssl_hdr_len( ssl ) + transform_expansion );
}
#if defined(POLARSSL_X509_CRT_PARSE_C)
const x509_crt *ssl_get_peer_cert( const ssl_context *ssl )
{