private PemObject createPemObject(Object o) throws IOException {
String type;
byte[] encoding;
if (o instanceof PemObject) {
return (PemObject) o;
}
if (o instanceof PemObjectGenerator) {
return ((PemObjectGenerator) o).generate();
}
if (o instanceof X509Certificate) {
type = "CERTIFICATE";
try {
encoding = ((X509Certificate) o).getEncoded();
} catch (CertificateEncodingException e) {
throw new PemGenerationException("Cannot encode object: " + e.toString());
}
} else if (o instanceof X509CRL) {
type = "X509 CRL";
try {
encoding = ((X509CRL) o).getEncoded();
} catch (CRLException e) {
throw new PemGenerationException("Cannot encode object: " + e.toString());
}
} else if (o instanceof KeyPair) {
return createPemObject(((KeyPair) o).getPrivate());
} else if (o instanceof PrivateKey) {
PrivateKeyInfo info =
new PrivateKeyInfo((ASN1Sequence) ASN1Primitive.fromByteArray(((Key) o).getEncoded()));
if (o instanceof RSAPrivateKey) {
type = "RSA PRIVATE KEY";
encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
} else if (o instanceof DSAPrivateKey) {
type = "DSA PRIVATE KEY";
DSAParameter p = DSAParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(new DERInteger(0));
v.add(new DERInteger(p.getP()));
v.add(new DERInteger(p.getQ()));
v.add(new DERInteger(p.getG()));
BigInteger x = ((DSAPrivateKey) o).getX();
BigInteger y = p.getG().modPow(x, p.getP());
v.add(new DERInteger(y));
v.add(new DERInteger(x));
encoding = new DERSequence(v).getEncoded();
} else if (((PrivateKey) o).getAlgorithm().equals("ECDSA")) {
type = "EC PRIVATE KEY";
encoding = info.parsePrivateKey().toASN1Primitive().getEncoded();
} else {
throw new IOException("Cannot identify private key");
}
} else if (o instanceof PublicKey) {
type = "PUBLIC KEY";
encoding = ((PublicKey) o).getEncoded();
} else if (o instanceof X509AttributeCertificate) {
type = "ATTRIBUTE CERTIFICATE";
encoding = ((X509V2AttributeCertificate) o).getEncoded();
} else if (o instanceof PKCS10CertificationRequest) {
type = "CERTIFICATE REQUEST";
encoding = ((PKCS10CertificationRequest) o).getEncoded();
} else if (o instanceof ContentInfo) {
type = "PKCS7";
encoding = ((ContentInfo) o).getEncoded();
} else {
throw new PemGenerationException("unknown object passed - can't encode.");
}
return new PemObject(type, encoding);
}
