Read RSA private key of format PKCS1 in JAVA

Question

Is it possible to read the RSA private key of format PKCS1 in JAVA without converting to PKCS8? if yes, sample code is appreciated.

-----BEGIN RSA PRIVATE KEY-----
 BASE64 ENCODED DATA
-----END RSA PRIVATE KEY-----

Answer 1

Java does not come with out-of-the-box support for PKCS1 keys. You can however use Bouncycastle

PEMParser pemParser = new PEMParser(new FileReader(privateKeyFile));
JcaPEMKeyConverter converter = new JcaPEMKeyConverter().setProvider("BC");
Object object = pemParser.readObject();
KeyPair kp = converter.getKeyPair((PEMKeyPair) object);
PrivateKey privateKey = kp.getPrivate();