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package pkix
import (
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"github.com/foxboron/go-tpm-keyfiles/template"
"github.com/google/go-tpm/tpm2"
)
// ToTPMPublic takes a PKIX ASN.1 structure and transforms it into a
// tpm2.TPMTPublic structure
func ToTPMPublic(pKey []byte) (*tpm2.TPMTPublic, error) {
block, _ := pem.Decode([]byte(pKey))
if block == nil || block.Type != "PUBLIC KEY" {
return nil, fmt.Errorf("failed to decode PEM block containing public key")
}
key, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, fmt.Errorf("failed parsing pem key: %v", err)
}
switch p := key.(type) {
case *ecdsa.PublicKey:
return template.EcdsaToTPMTPublic(p, tpm2.TPMAlgSHA256), nil
case *rsa.PublicKey:
// TODO: Support other bit lengths
return template.RSAToTPMTPublic(p, 2048), nil
default:
return nil, fmt.Errorf("unsupported keytype")
}
}
// FromTPMPublic takes a tpm2.TPMTPublic struct and transform it into a PKIX
// ASN.1 structure
func FromTPMPublic(pub *tpm2.TPMTPublic) ([]byte, error) {
pk, err := template.FromTPMPublicToPubkey(pub)
if err != nil {
return nil, err
}
return x509.MarshalPKIXPublicKey(pk)
}
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