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package x509util
import (
"crypto/x509"
"strings"
"github.com/pkg/errors"
)
// List of signature algorithms.
const (
MD2WithRSA = "MD2-RSA"
MD5WithRSA = "MD5-RSA"
SHA1WithRSA = "SHA1-RSA"
SHA256WithRSA = "SHA256-RSA"
SHA384WithRSA = "SHA384-RSA"
SHA512WithRSA = "SHA512-RSA"
DSAWithSHA1 = "DSA-SHA1"
DSAWithSHA256 = "DSA-SHA256"
ECDSAWithSHA1 = "ECDSA-SHA1"
ECDSAWithSHA256 = "ECDSA-SHA256"
ECDSAWithSHA384 = "ECDSA-SHA384"
ECDSAWithSHA512 = "ECDSA-SHA512"
SHA256WithRSAPSS = "SHA256-RSAPSS"
SHA384WithRSAPSS = "SHA384-RSAPSS"
SHA512WithRSAPSS = "SHA512-RSAPSS"
PureEd25519 = "Ed25519"
)
var signatureAlgorithmMapping = []struct {
name string
value x509.SignatureAlgorithm
}{
{"", x509.UnknownSignatureAlgorithm},
{MD2WithRSA, x509.MD2WithRSA},
{MD5WithRSA, x509.MD5WithRSA},
{SHA1WithRSA, x509.SHA1WithRSA},
{SHA256WithRSA, x509.SHA256WithRSA},
{SHA384WithRSA, x509.SHA384WithRSA},
{SHA512WithRSA, x509.SHA512WithRSA},
{DSAWithSHA1, x509.DSAWithSHA1},
{DSAWithSHA256, x509.DSAWithSHA256},
{ECDSAWithSHA1, x509.ECDSAWithSHA1},
{ECDSAWithSHA256, x509.ECDSAWithSHA256},
{ECDSAWithSHA384, x509.ECDSAWithSHA384},
{ECDSAWithSHA512, x509.ECDSAWithSHA512},
{SHA256WithRSAPSS, x509.SHA256WithRSAPSS},
{SHA384WithRSAPSS, x509.SHA384WithRSAPSS},
{SHA512WithRSAPSS, x509.SHA512WithRSAPSS},
{PureEd25519, x509.PureEd25519},
}
// SignatureAlgorithm is the JSON representation of the X509 signature algorithms
type SignatureAlgorithm x509.SignatureAlgorithm
// Set sets the signature algorithm in the given certificate.
func (s SignatureAlgorithm) Set(c *x509.Certificate) {
c.SignatureAlgorithm = x509.SignatureAlgorithm(s)
}
// MarshalJSON implements the json.Marshaller interface.
func (s SignatureAlgorithm) MarshalJSON() ([]byte, error) {
if s == SignatureAlgorithm(x509.UnknownSignatureAlgorithm) {
return []byte(`""`), nil
}
return []byte(`"` + x509.SignatureAlgorithm(s).String() + `"`), nil
}
// UnmarshalJSON implements the json.Unmarshal interface and unmarshals and
// validates a string as a SignatureAlgorithm.
func (s *SignatureAlgorithm) UnmarshalJSON(data []byte) error {
name, err := unmarshalString(data)
if err != nil {
return err
}
for _, m := range signatureAlgorithmMapping {
if strings.EqualFold(name, m.name) {
*s = SignatureAlgorithm(m.value)
return nil
}
}
return errors.Errorf("unsupported signatureAlgorithm %s", name)
}
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