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// Package derhelpers implements common functionality
// on DER encoded data
package derhelpers
import (
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
cferr "github.com/cloudflare/cfssl/errors"
)
// ParsePrivateKeyDER parses a PKCS #1, PKCS #8, ECDSA, or Ed25519 DER-encoded
// private key. The key must not be in PEM format.
func ParsePrivateKeyDER(keyDER []byte) (key crypto.Signer, err error) {
generalKey, err := x509.ParsePKCS8PrivateKey(keyDER)
if err != nil {
generalKey, err = x509.ParsePKCS1PrivateKey(keyDER)
if err != nil {
generalKey, err = x509.ParseECPrivateKey(keyDER)
if err != nil {
generalKey, err = ParseEd25519PrivateKey(keyDER)
if err != nil {
// We don't include the actual error into
// the final error. The reason might be
// we don't want to leak any info about
// the private key.
return nil, cferr.New(cferr.PrivateKeyError,
cferr.ParseFailed)
}
}
}
}
switch generalKey := generalKey.(type) {
case *rsa.PrivateKey:
return generalKey, nil
case *ecdsa.PrivateKey:
return generalKey, nil
case ed25519.PrivateKey:
return generalKey, nil
}
// should never reach here
return nil, cferr.New(cferr.PrivateKeyError, cferr.ParseFailed)
}
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