CODEWITHSUNDEEP
javasecuritycryptographyprivate-keynss
Marcin Mierzejewski
Marcin Mierzejewski

Reputation: 726

How to export RSA private key to pem format using java

I got private key which I would like to export to .pem format Problem is that, when I call privateKey.getEncoded() I get null. But I can get all info like exponent, modulus and so one (all from interface RSAPrivateKey). privateKey is org.mozilla.jss.pkcs11.PK11RSAPrivateKey Object.

    public String exportPrivateKey(PrivateKey privateKey) throws Throwable {
    byte[] encoded = privateKey.getEncoded();//this is null:<
    String body = DatatypeConverter.printBase64Binary(encoded);

    return RSA_PRIVATE_HEADER + body + RSA_PRIVATE_FOOTER;
}

How to export that key to pem file?

Upvotes: 1

Views: 1618

Answers (1)

Marcin Mierzejewski
Marcin Mierzejewski

Reputation: 726

Method I found in PKCS12Export, and it propably works:P

private byte[] getEncodedKey(PrivateKey var1) throws Exception {
    CryptoManager var2 = CryptoManager.getInstance();
    CryptoToken var3 = var2.getInternalKeyStorageToken();
    KeyGenerator var4 = var3.getKeyGenerator(KeyGenAlgorithm.DES3);
    SymmetricKey var5 = var4.generate();
    KeyWrapper var6 = var3.getKeyWrapper(KeyWrapAlgorithm.DES3_CBC_PAD);
    byte[] var7 = new byte[]{(byte)1, (byte)1, (byte)1, (byte)1, (byte)1, (byte)1, (byte)1, (byte)1};
    IVParameterSpec var8 = new IVParameterSpec(var7);
    var6.initWrap(var5, var8);
    byte[] var9 = var6.wrap(var1);
    Cipher var10 = var3.getCipherContext(EncryptionAlgorithm.DES3_CBC_PAD);
    var10.initDecrypt(var5, var8);
    return var10.doFinal(var9);
}

Upvotes: 1

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