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Fix bugs in ECDHE_PSK key exchange

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-10-14 12:00:45 +02:00
parent 225d6aa786
commit b59d699a65
2 changed files with 34 additions and 56 deletions
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25
library/ssl_cli.c
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@ -1908,6 +1908,7 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK )
{
unsigned char *p = ssl->handshake->premaster;
size_t zlen;
/*
* ECDHE_PSK key exchange: RFC 5489, section 2
@ -1922,14 +1923,14 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
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 );
ssl->out_msg[i++] = (unsigned char)( ssl->psk_identity_len >> 8 );
ssl->out_msg[i++] = (unsigned char)( ssl->psk_identity_len );
memcpy( ssl->out_msg + 6, ssl->psk_identity, ssl->psk_identity_len );
memcpy( ssl->out_msg + i, ssl->psk_identity, ssl->psk_identity_len );
i += ssl->psk_identity_len;
ret = ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
&ssl->out_msg[8 + ssl->psk_identity_len], 512,
&ssl->out_msg[i], 1000,
ssl->f_rng, ssl->p_rng );
if( ret != 0 )
{
@ -1937,9 +1938,6 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
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 );
/*
@ -1949,7 +1947,7 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
* };
* with "other_secret" containing Z from ECDH
*/
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &n,
if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
p + 2, POLARSSL_MPI_MAX_SIZE,
ssl->f_rng, ssl->p_rng ) ) != 0 )
{
@ -1957,9 +1955,9 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
return( ret );
}
*(p++) = (unsigned char)( n >> 8 );
*(p++) = (unsigned char)( n );
p += n;
*(p++) = (unsigned char)( zlen >> 8 );
*(p++) = (unsigned char)( zlen );
p += zlen;
SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
@ -1968,8 +1966,7 @@ static int ssl_write_client_key_exchange( ssl_context *ssl )
memcpy( p, ssl->psk, ssl->psk_len );
p += ssl->psk_len;
ssl->handshake->pmslen = 4 + n + ssl->psk_len;
n = ssl->handshake->pmslen;
ssl->handshake->pmslen = p - ssl->handshake->premaster;
}
else
#endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */