Read RSA private key of format PKCS1 in JAVA

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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();

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