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cahash.go
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cahash.go
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// Copyright © 2021 - 2023 SUSE LLC
// 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 cahash
import (
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/paketo-buildpacks/ca-certificates/v3/cacerts"
"github.com/pkg/errors"
)
// -----------------------------------------------------------------------------------
func GenerateHash(certRaw []byte) (string, error) {
cert, err := DecodeOneCert(certRaw)
if err != nil {
return "", fmt.Errorf("failed to decode certificate\n%w", err)
}
hash, err := cacerts.SubjectNameHash(cert)
if err != nil {
return "", fmt.Errorf("failed compute subject name hash for cert\n%w", err)
}
name := fmt.Sprintf("%08x", hash)
return name, nil
}
// -----------------------------------------------------------------------------------
// See gh:paketo-buildpacks/ca-certificates (cacerts/certs.go) for the original code.
// https://github.com/paketo-buildpacks/ca-certificates
//
// Iterates over pem blocks until a valid certificate is found or no other PEM blocks exist.
func DecodeOneCert(raw []byte) (*x509.Certificate, error) {
byteData := raw
for len(byteData) > 0 {
block, rest := pem.Decode(byteData)
if block == nil {
return nil, errors.New("failed decoding PEM data")
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
byteData = rest
continue // pem block is not a cert? (e.g. maybe it was a dh_params block)
}
return cert, nil
}
return nil, errors.New("failed find PEM data")
}
// DecodeCerts iterates over pem blocks and load all the valid certificates
func DecodeCerts(raw []byte) ([]*x509.Certificate, error) {
certs := []*x509.Certificate{}
byteData := raw
for len(byteData) > 0 {
block, rest := pem.Decode(byteData)
if block == nil {
return nil, errors.New("failed decoding PEM data")
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
byteData = rest
continue // pem block is not a cert? (e.g. maybe it was a dh_params block)
}
certs = append(certs, cert)
}
return certs, nil
}