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util.go
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/
util.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package comm
import (
"crypto/x509"
"encoding/pem"
)
// AddPemToCertPool adds PEM-encoded certs to a cert pool
func AddPemToCertPool(pemCerts []byte, pool *x509.CertPool) error {
certs, _, err := pemToX509Certs(pemCerts)
if err != nil {
return err
}
for _, cert := range certs {
pool.AddCert(cert)
}
return nil
}
//utility function to parse PEM-encoded certs
func pemToX509Certs(pemCerts []byte) ([]*x509.Certificate, []string, error) {
//it's possible that multiple certs are encoded
certs := []*x509.Certificate{}
subjects := []string{}
for len(pemCerts) > 0 {
var block *pem.Block
block, pemCerts = pem.Decode(pemCerts)
if block == nil {
break
}
/** TODO: check why msp does not add type to PEM header
if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
continue
}
*/
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, subjects, err
} else {
certs = append(certs, cert)
//extract and append the subject
subjects = append(subjects, string(cert.RawSubject))
}
}
return certs, subjects, nil
}