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Login Encryption : build public key


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Hello, i enable the login encryption in my jasper server, and i want use a dynamic key encryption ( http://community.jaspersoft.com/documentation/jasperreports-server-web-services-guide/v56/login-encryption).

The rest service 'GetEncryptionKey' returns : 

{  "maxdigits":"131",  "e":"10001",  "n":"9f8a2dc4baa260a5835fa33ef94c..."}[/code]


But, how i build the public key with this ? I tried this code : 

byte[] publicBytes = Base64.decodeBase64(responseBody);        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicBytes);        KeyFactory keyFactory = KeyFactory.getInstance("RSA");        PublicKey publicKey = keyFactory.generatePublic(keySpec);[/code]


but i have a java.security.InvalidKeyException: invalid key format. 

What is the solution ? Thx!



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Ok, I use this code to encrypt password with bouncycastle 1.57: 
   Security.insertProviderAt(new BouncyCastleProvider(), 1);   RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(new BigInteger(n,           16), new BigInteger(e, 16));   PublicKey publicKey = KeyFactory.getInstance("RSA").generatePublic(publicKeySpec);   Cipher cipher = Cipher.getInstance("RSA/NONE/NoPadding", "BC");   cipher.init(Cipher.ENCRYPT_MODE, publicKey);   byte[] cipherText = cipher.doFinal("joeuser".getBytes("UTF8"));   return Base64.encodeBase64String(cipherText);[/code]
After, i use this direct url and i have an error on login page :

BUT, if i write the password in plain text, this url works : 

Encryption is enabled, so why the plain text version works, and not the encrypted version ? If i turn off encryption, the rest service returns Error: Key generation is off.
Maybe i have to use somewhere the attribute 'maxdigits' to build public key ?
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