I’m using BouncyCastle 1.57 (bcprov-jdk15on, bcmail-jdk15on and bcpkix-jdk15on) and Java 7.
You can read the private key using the JcaPEMKeyConverter
class.
The code below works for keys with and without a password:
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openssl.PEMDecryptorProvider;
import org.bouncycastle.openssl.PEMEncryptedKeyPair;
import org.bouncycastle.openssl.PEMKeyPair;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
import org.bouncycastle.openssl.jcajce.JcePEMDecryptorProviderBuilder;
// don't forget to add the provider
Security.addProvider(new BouncyCastleProvider());
String password = "your password";
// reads your key file
PEMParser pemParser = new PEMParser(new FileReader(keyFile));
Object object = pemParser.readObject();
JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
KeyPair kp;
if (object instanceof PEMEncryptedKeyPair) {
// Encrypted key - we will use provided password
PEMEncryptedKeyPair ckp = (PEMEncryptedKeyPair) object;
// uses the password to decrypt the key
PEMDecryptorProvider decProv = new JcePEMDecryptorProviderBuilder().build(password.toCharArray());
kp = converter.getKeyPair(ckp.decryptKeyPair(decProv));
} else {
// Unencrypted key - no password needed
PEMKeyPair ukp = (PEMKeyPair) object;
kp = converter.getKeyPair(ukp);
}
// RSA
KeyFactory keyFac = KeyFactory.getInstance("RSA");
RSAPrivateCrtKeySpec privateKey = keyFac.getKeySpec(kp.getPrivate(), RSAPrivateCrtKeySpec.class);
System.out.println(privateKey.getClass());
The privateKey
‘s class will be java.security.spec.RSAPrivateCrtKeySpec
(which extends RSAPrivateKeySpec
).