73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
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/*
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Package ca implements a disk file-backed certificate authority with a built-in
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CRL signer. The certificate authority can issue new certificates (including the
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creation of intermediate CAs) and revoke existing certificates, resulting in a
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fresh CRL.
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*/
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package ca
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import (
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"crypto/rsa"
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"crypto/sha1"
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"crypto/x509"
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"encoding/asn1"
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"fmt"
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"path/filepath"
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"src.lwithers.me.uk/go/rsa/pkg/pemfile"
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)
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type CA struct {
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dir string
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key *rsa.PrivateKey
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root *x509.Certificate
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crl *x509.RevocationList
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crlKey *rsa.PrivateKey
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crlCert *x509.Certificate
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}
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const (
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rootKeyFilename = "root-key.pem"
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rootCertFilename = "root-cert.pem"
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)
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// Open an existing certificate authority in the given directory.
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func Open(dir string) (*CA, error) {
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ca := &CA{
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dir: dir,
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}
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var err error
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ca.key, err = pemfile.ReadKey(filepath.Join(dir, rootKeyFilename))
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if err != nil {
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return nil, fmt.Errorf("while opening CA (root key): %w", err)
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}
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ca.root, err = pemfile.ReadCert(filepath.Join(dir, rootCertFilename))
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if err != nil {
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return nil, fmt.Errorf("while opening CA (root cert): %w", err)
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}
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if err = ca.loadCRLState(); err != nil {
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return nil, fmt.Errorf("while opening CA (CRL state): %w", err)
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}
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return ca, nil
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}
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func (ca *CA) GetRoot() *x509.Certificate {
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return ca.root
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}
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func (ca *CA) GetCRLSigner() *x509.Certificate {
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return ca.crlCert
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}
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func (ca *CA) GetCRL() *x509.RevocationList {
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return ca.crl
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}
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func ComputeSubjectKeyId(key *rsa.PublicKey) []byte {
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der, _ := asn1.Marshal(key)
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h := sha1.Sum(der)
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return h[:]
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}
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