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| IIB9: Custom Decryption |
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| akil |
 Posted: Thu Nov 27, 2014 6:00 am Post subject: IIB9: Custom Decryption |
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Partisan
Joined: 27 May 2014
Posts: 338
Location: Mumbai
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Hi
I get an incoming message that has one element encrypted using a RSA public key. I have the private key in a file. This isn't a complete certificate, it is just the key, generated via a small java program
| Code: |
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024); // can give the key size for key pair
KeyPair kp = kpg.genKeyPair();
Key publicKey = kp.getPublic();
Key privateKey = kp.getPrivate();
KeyFactory fact = KeyFactory.getInstance("RSA");
RSAPublicKeySpec pub = fact.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);
RSAPrivateKeySpec priv = fact.getKeySpec(kp.getPrivate(), RSAPrivateKeySpec.class);
saveToFile("public.key", pub.getModulus(),pub.getPublicExponent());
saveToFile("private.key", priv.getModulus(),priv.getPrivateExponent());
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Now I have to decrypt this element in the message flow, for which I have to do something like the following code
| Code: |
PrivateKey priKey = readKeyFromFile("private.key");
// use the private key for decryption
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, priKey);
decryptedData = cipher.doFinal(dataToDecrypt);
System.out.println(new String(decryptedData));
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I am wondering how do I proceed with reading this file , earlier posts in the forum suggest that reading files isn't a good thing to do in the bus.
There are multiple environments (QA, UAT, PRD), each having its own private.key, so I can't just package the file along with the code..
Any suggestions?
[/code]
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| fjb_saper |
| Posted: Thu Nov 27, 2014 11:06 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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Configurable service pointing to the file? 
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| akil |
| Posted: Thu Nov 27, 2014 11:53 pm Post subject: |
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Partisan
Joined: 27 May 2014
Posts: 338
Location: Mumbai
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That'll take care of different files paths in different environments..
But do I go ahead and read it in the flow ?
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| akil |
| Posted: Fri Nov 28, 2014 10:06 pm Post subject: |
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Partisan
Joined: 27 May 2014
Posts: 338
Location: Mumbai
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So I decided to add 2 properties in the UDCS, the private Exponent & the private Modulus , I build the private key from this , this avoids the file read altogether ..
Interestingly if I name the property to contain the phrase 'Password', the value is masked when mqsireportproperties is called - that's pretty neat !.
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