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// Copyright (C) 2017. See AUTHORS.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package openssl
// #include "shim.h"
import "C"
import (
"fmt"
"unsafe"
)
// Digest represents and openssl message digest.
type Digest struct {
ptr *C.EVP_MD
}
// GetDigestByName returns the Digest with the name or nil and an error if the
// digest was not found.
func GetDigestByName(name string) (*Digest, error) {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
p := C.X_EVP_get_digestbyname(cname)
if p == nil {
return nil, fmt.Errorf("Digest %v not found", name)
}
// we can consider digests to use static mem; don't need to free
return &Digest{ptr: p}, nil
}
// GetDigestByName returns the Digest with the NID or nil and an error if the
// digest was not found.
func GetDigestByNid(nid NID) (*Digest, error) {
sn, err := Nid2ShortName(nid)
if err != nil {
return nil, err
}
return GetDigestByName(sn)
}
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