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74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package cert
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import (
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"bytes"
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"crypto/x509"
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"encoding/pem"
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"errors"
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)
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const (
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// CertificateBlockType is a possible value for pem.Block.Type.
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CertificateBlockType = "CERTIFICATE"
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// CertificateRequestBlockType is a possible value for pem.Block.Type.
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CertificateRequestBlockType = "CERTIFICATE REQUEST"
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)
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// ParseCertsPEM returns the x509.Certificates contained in the given PEM-encoded byte array
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// Returns an error if a certificate could not be parsed, or if the data does not contain any certificates
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func ParseCertsPEM(pemCerts []byte) ([]*x509.Certificate, error) {
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ok := false
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certs := []*x509.Certificate{}
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for len(pemCerts) > 0 {
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var block *pem.Block
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block, pemCerts = pem.Decode(pemCerts)
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if block == nil {
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break
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}
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// Only use PEM "CERTIFICATE" blocks without extra headers
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if block.Type != CertificateBlockType || len(block.Headers) != 0 {
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continue
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}
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cert, err := x509.ParseCertificate(block.Bytes)
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if err != nil {
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return certs, err
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}
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certs = append(certs, cert)
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ok = true
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}
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if !ok {
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return certs, errors.New("data does not contain any valid RSA or ECDSA certificates")
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}
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return certs, nil
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}
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// EncodeCertificates returns the PEM-encoded byte array that represents by the specified certs.
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func EncodeCertificates(certs ...*x509.Certificate) ([]byte, error) {
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b := bytes.Buffer{}
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for _, cert := range certs {
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if err := pem.Encode(&b, &pem.Block{Type: CertificateBlockType, Bytes: cert.Raw}); err != nil {
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return []byte{}, err
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}
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}
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return b.Bytes(), nil
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}
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