lib/mbedtls
1
0
Fork 0
mirror of https://github.com/Mbed-TLS/mbedtls.git synced 2025-07-28 00:21:48 +03:00
Code Activity

Add support for ECDHE_PSK key exchange

Browse Source
This commit is contained in:
Manuel Pégourié-Gonnard
2013-10-11 16:53:50 +02:00
parent d93d28e370
commit 3ce3bbdc00
5 changed files with 197 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

103
library/ssl_cli.c
View File

@ -1106,7 +1106,8 @@ static int ssl_parse_server_dh_params( ssl_context *ssl, unsigned char **p,
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
static int ssl_parse_server_ecdh_params( ssl_context *ssl,
unsigned char **p,
unsigned char *end )
@ -1143,10 +1144,12 @@ static int ssl_parse_server_ecdh_params( ssl_context *ssl,
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
static int ssl_parse_server_psk_hint( ssl_context *ssl,
unsigned char **p,
unsigned char *end )
@ -1177,7 +1180,8 @@ static int ssl_parse_server_psk_hint( ssl_context *ssl,
return( ret );
}
#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED ||
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED
POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_SSL_PROTO_TLS1_2)
#if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
@ -1254,7 +1258,8 @@ static int ssl_parse_server_key_exchange( ssl_context *ssl )
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_RSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_PSK &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK )
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK &&
ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
ssl->state++;
@ -1352,6 +1357,25 @@ static int ssl_parse_server_key_exchange( ssl_context *ssl )
}
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
unsigned char *p = ssl->in_msg + 4;
unsigned char *end = ssl->in_msg + ssl->in_hslen;
if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 )
{
SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
}
}
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
{
return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
}
@ -1880,6 +1904,75 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
}
else
#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
unsigned char *p = ssl->handshake->premaster;
/*
* ECDHE_PSK key exchange: RFC 5489, section 2
*
* opaque psk_identity<0..2^16-1>;
* ClientECDiffieHellmanPublic public;
*/
if( ssl->psk == NULL )
return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
if( sizeof(ssl->handshake->premaster) < 4 + ssl->psk_identity_len )
return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
i = 4;
n = ssl->psk_identity_len;
ssl->out_msg[4] = (unsigned char)( n >> 8 );
ssl->out_msg[5] = (unsigned char)( n );
memcpy( ssl->out_msg + 6, ssl->psk_identity, ssl->psk_identity_len );
ret = ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
&ssl->out_msg[8 + ssl->psk_identity_len], 512,
ssl->f_rng, ssl->p_rng );
if( ret != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_make_public", ret );
return( ret );
}
ssl->out_msg[6 + ssl->psk_identity_len] = (unsigned char)( n >> 8 );
ssl->out_msg[7 + ssl->psk_identity_len] = (unsigned char)( n );
SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
/*
* PMS = struct {
* opaque other_secret<0..2^16-1>;
* opaque psk<0..2^16-1>;
* };
* with "other_secret" containing Z from ECDH
*/
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &n,
p + 2, POLARSSL_MPI_MAX_SIZE,
ssl->f_rng, ssl->p_rng ) ) != 0 )
{
SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret );
return( ret );
}
*(p++) = (unsigned char)( n >> 8 );
*(p++) = (unsigned char)( n );
p += n;
SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
*(p++) = (unsigned char)( ssl->psk_len >> 8 );
*(p++) = (unsigned char)( ssl->psk_len );
memcpy( p, ssl->psk, ssl->psk_len );
p += ssl->psk_len;
ssl->handshake->pmslen = 4 + n + ssl->psk_len;
n = ssl->handshake->pmslen;
}
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA )
{