lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-08-01 10:06:53 +03:00
Code Activity

Add function parsing a TLS ECParameters record

Browse Source
This commit is contained in:
Manuel Pégourié-Gonnard
2013-02-09 17:03:58 +01:00
parent cf4a70c8ed
commit 1a96728964
4 changed files with 96 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
library/ecp.c
View File

@ -29,6 +29,7 @@
* SEC1 http://www.secg.org/index.php?action=secg,docs_secg
* GECC = Guide to Elliptic Curve Cryptography - Hankerson, Menezes, Vanstone
* FIPS 186-3 http://csrc.nist.gov/publications/fips/fips186-3/fips_186-3.pdf
* RFC 4492 for the related TLS structures and constants
*/
#include "polarssl/config.h"
@ -493,7 +494,7 @@ cleanup:
/*
* Set a group using well-known domain parameters
*/
int ecp_use_known_dp( ecp_group *grp, size_t index )
int ecp_use_known_dp( ecp_group *grp, uint16_t index )
{
switch( index )
{
@ -525,7 +526,33 @@ int ecp_use_known_dp( ecp_group *grp, size_t index )
SECP521R1_GX, SECP521R1_GY, SECP521R1_N ) );
}
return( POLARSSL_ERR_ECP_GENERIC );
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
}
/*
* Set a group from an ECParameters record (RFC 4492)
*/
int ecp_tls_read_group( ecp_group *grp, const unsigned char *buf, size_t len )
{
uint16_t namedcurve;
/*
* We expect at least three bytes (see below)
*/
if( len < 3 )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
/*
* First byte is curve_type; only named_curve is handled
*/
if( *buf++ != POLARSSL_ECP_TLS_NAMED_CURVE )
return( POLARSSL_ERR_ECP_BAD_INPUT_DATA );
/*
* Next two bytes are the namedcurve
*/
namedcurve = 256 * buf[0] + buf[1];
return ecp_use_known_dp( grp, namedcurve );
}
/*