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