Merge pull request #5613 from mprse/tls_ecdh_2a
TLS ECDH 2a: server-side ECDHE-ECDSA and ECDHE-RSA (1.2)
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index c757ac8..094fca8 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -3116,21 +3116,113 @@
MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
- if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx,
- (*curve)->grp_id ) ) != 0 )
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+ if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
+ ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
{
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
- return( ret );
- }
+ psa_status_t status = PSA_ERROR_GENERIC_ERROR;
+ psa_key_attributes_t key_attributes;
+ mbedtls_ssl_handshake_params *handshake = ssl->handshake;
+ size_t ecdh_bits = 0;
+ uint8_t *p = ssl->out_msg + ssl->out_msglen;
+ const size_t header_size = 4; // curve_type(1), namedcurve(2),
+ // data length(1)
+ const size_t data_length_size = 1;
- if( ( ret = mbedtls_ecdh_make_params(
- &ssl->handshake->ecdh_ctx, &len,
- ssl->out_msg + ssl->out_msglen,
- MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen,
- ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) );
+
+ /* Convert EC group to PSA key type. */
+ handshake->ecdh_psa_type = mbedtls_psa_parse_tls_ecc_group(
+ (*curve)->tls_id, &ecdh_bits );
+
+ if( handshake->ecdh_psa_type == 0 || ecdh_bits > 0xffff )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Invalid ecc group parse." ) );
+ return( MBEDTLS_ERR_SSL_ILLEGAL_PARAMETER );
+ }
+ handshake->ecdh_bits = (uint16_t) ecdh_bits;
+
+ key_attributes = psa_key_attributes_init();
+ psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
+ psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH );
+ psa_set_key_type( &key_attributes, handshake->ecdh_psa_type );
+ psa_set_key_bits( &key_attributes, handshake->ecdh_bits );
+
+ /*
+ * ECParameters curve_params
+ *
+ * First byte is curve_type, always named_curve
+ */
+ *p++ = MBEDTLS_ECP_TLS_NAMED_CURVE;
+
+ /*
+ * Next two bytes are the namedcurve value
+ */
+ MBEDTLS_PUT_UINT16_BE( (*curve)->tls_id, p, 0 );
+ p += 2;
+
+ /* Generate ECDH private key. */
+ status = psa_generate_key( &key_attributes,
+ &handshake->ecdh_psa_privkey );
+ if( status != PSA_SUCCESS )
+ {
+ ret = psa_ssl_status_to_mbedtls( status );
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_generate_key", ret );
+ return( ret );
+ }
+
+ /*
+ * ECPoint public
+ *
+ * First byte is data length.
+ * It will be filled later. p holds now the data length location.
+ */
+
+ /* Export the public part of the ECDH private key from PSA.
+ * Make one byte space for the length.
+ */
+ unsigned char *own_pubkey = p + data_length_size;
+
+ size_t own_pubkey_max_len = (size_t)( MBEDTLS_SSL_OUT_CONTENT_LEN
+ - ( own_pubkey - ssl->out_msg ) );
+
+ status = psa_export_public_key( handshake->ecdh_psa_privkey,
+ own_pubkey, own_pubkey_max_len,
+ &len );
+ if( status != PSA_SUCCESS )
+ {
+ ret = psa_ssl_status_to_mbedtls( status );
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_export_public_key", ret );
+ (void) psa_destroy_key( handshake->ecdh_psa_privkey );
+ handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
+ return( ret );
+ }
+
+ /* Store the length of the exported public key. */
+ *p = (uint8_t) len;
+
+ /* Determine full message length. */
+ len += header_size;
+ }
+ else
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
{
- MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
- return( ret );
+ if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx,
+ (*curve)->grp_id ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
+ return( ret );
+ }
+
+ if( ( ret = mbedtls_ecdh_make_params(
+ &ssl->handshake->ecdh_ctx, &len,
+ ssl->out_msg + ssl->out_msglen,
+ MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen,
+ ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
+ {
+ MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
+ return( ret );
+ }
}
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
@@ -3801,6 +3893,67 @@
}
else
#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
+#if defined(MBEDTLS_USE_PSA_CRYPTO) && \
+ ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
+ defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) )
+ if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
+ ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
+ {
+ size_t data_len = (size_t)( *p++ );
+ size_t buf_len = (size_t)( end - p );
+ psa_status_t status = PSA_ERROR_GENERIC_ERROR;
+ mbedtls_ssl_handshake_params *handshake = ssl->handshake;
+
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Read the peer's public key." ) );
+
+ /*
+ * We must have at least two bytes (1 for length, at least 1 for data)
+ */
+ if( buf_len < 2 )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Invalid buffer length" ) );
+ return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+ }
+
+ if( data_len < 1 || data_len > buf_len )
+ {
+ MBEDTLS_SSL_DEBUG_MSG( 1, ( "Invalid data length" ) );
+ return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+ }
+
+ /* Store peer's ECDH public key. */
+ memcpy( handshake->ecdh_psa_peerkey, p, data_len );
+ handshake->ecdh_psa_peerkey_len = data_len;
+
+ /* Compute ECDH shared secret. */
+ status = psa_raw_key_agreement(
+ PSA_ALG_ECDH, handshake->ecdh_psa_privkey,
+ handshake->ecdh_psa_peerkey, handshake->ecdh_psa_peerkey_len,
+ handshake->premaster, sizeof( handshake->premaster ),
+ &handshake->pmslen );
+ if( status != PSA_SUCCESS )
+ {
+ ret = psa_ssl_status_to_mbedtls( status );
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_raw_key_agreement", ret );
+ (void) psa_destroy_key( handshake->ecdh_psa_privkey );
+ handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
+ return( ret );
+ }
+
+ status = psa_destroy_key( handshake->ecdh_psa_privkey );
+
+ if( status != PSA_SUCCESS )
+ {
+ ret = psa_ssl_status_to_mbedtls( status );
+ MBEDTLS_SSL_DEBUG_RET( 1, "psa_destroy_key", ret );
+ return( ret );
+ }
+ handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
+ }
+ else
+#endif /* MBEDTLS_USE_PSA_CRYPTO &&
+ ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
+ MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */
#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \