func crypto/x509.MarshalPKCS1PrivateKey
2 uses
	crypto/x509 (current package)
		pkcs1.go#L133: func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte {
		pkcs8.go#L119: 		privKey.PrivateKey = MarshalPKCS1PrivateKey(k)
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