mirror of
https://github.com/libp2p/go-openssl.git
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65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
// Copyright (C) 2017. See AUTHORS.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package openssl
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// #include "shim.h"
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import "C"
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import (
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"errors"
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"runtime"
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"unsafe"
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)
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type DH struct {
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dh *C.struct_dh_st
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}
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// LoadDHParametersFromPEM loads the Diffie-Hellman parameters from
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// a PEM-encoded block.
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func LoadDHParametersFromPEM(pem_block []byte) (*DH, error) {
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if len(pem_block) == 0 {
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return nil, errors.New("empty pem block")
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}
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bio := C.BIO_new_mem_buf(unsafe.Pointer(&pem_block[0]),
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C.int(len(pem_block)))
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if bio == nil {
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return nil, errors.New("failed creating bio")
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}
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defer C.BIO_free(bio)
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params := C.PEM_read_bio_DHparams(bio, nil, nil, nil)
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if params == nil {
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return nil, errors.New("failed reading dh parameters")
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}
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dhparams := &DH{dh: params}
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runtime.SetFinalizer(dhparams, func(dhparams *DH) {
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C.DH_free(dhparams.dh)
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})
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return dhparams, nil
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}
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// SetDHParameters sets the DH group (DH parameters) used to
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// negotiate an emphemeral DH key during handshaking.
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func (c *Ctx) SetDHParameters(dh *DH) error {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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if int(C.X_SSL_CTX_set_tmp_dh(c.ctx, dh.dh)) != 1 {
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return errorFromErrorQueue()
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}
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return nil
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}
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