Java – how to generate RSA keypair using password encrypted private key?

I want to generate the private key pkcs8 format for key encryption. I try to use this Code:

String password = "123456";
KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");
gen.initialize(2048);
KeyPair key = gen.generateKeyPair();
PrivateKey privateKey = key.getPrivate();
PublicKey publicKey = key.getPublic();

FileOutputStream pvt = new FileOutputStream("d:\\pvt123456.der");
try {
    pvt.write(privateKey.getEncoded());
    pvt.flush();
} finally {
    pvt.close();
}
FileOutputStream pub = new FileOutputStream("d:\\pub123456.der");
try {
    pub.write(publicKey.getEncoded());
    pub.flush();
} finally {
    pub.close();
}

But I don't know how to use 3DES encryption password to be compatible with OpenSSL format

Solution

I know it's a little late, but I've been looking for a way to do it, and I'm searching. I found your problem. Now I've found a way. I decided to come back and share:

// generate key pair

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.genKeyPair();

// extract the encoded private key,this is an unencrypted PKCS#8 private key
byte[] encodedprivkey = keyPair.getPrivate().getEncoded();

// We must use a PasswordBasedEncryption algorithm in order to encrypt the private key,you may use any common algorithm supported by openssl,you can check them in the openssl documentation http://www.openssl.org/docs/apps/pkcs8.html
String MYPBEALG = "PBEWithSHA1AndDESede";
String password = "pleaseChangeit!";

int count = 20;// hash iteration count
SecureRandom random = new SecureRandom();
byte[] salt = new byte[8];
random.nextBytes(salt);

// Create PBE parameter set
PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt,count);
PBEKeySpec pbeKeySpec = new PBEKeySpec(password.tocharArray());
SecretKeyFactory keyFac = SecretKeyFactory.getInstance(MYPBEALG);
SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);

Cipher pbeCipher = Cipher.getInstance(MYPBEALG);

// Initialize PBE Cipher with key and parameters
pbeCipher.init(Cipher.ENCRYPT_MODE,pbeKey,pbeParamSpec);

// Encrypt the encoded Private Key with the PBE key
byte[] ciphertext = pbeCipher.doFinal(encodedprivkey);

// Now construct  PKCS #8 EncryptedPrivateKeyInfo object
AlgorithmParameters algparms = AlgorithmParameters.getInstance(MYPBEALG);
algparms.init(pbeParamSpec);
EncryptedPrivateKeyInfo encinfo = new EncryptedPrivateKeyInfo(algparms,ciphertext);

// and here we have it! a DER encoded PKCS#8 encrypted key!
byte[] encryptedPkcs8 = encinfo.getEncoded();

This sample code is based on the following code I found: http://www.jensign.com/JavaScience/PEM/EncPrivKeyInfo/EncPrivKeyInfo.java

But rich resources also help me understand a little: http://java.sun.com/j2se/1.4.2/docs/guide/security/jce/JCERefGuide.html