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create a public key object

 
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i'am trying to create a public key object. this is my code :

1- EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(pkbytes);
2- KeyFactory keyFactory = KeyFactory.getInstance("DSA");
2- PublicKey pubKey = keyFactory.generatePublic(pubKeySpec);
3- signAl = Signature.getInstance(SHA1withDSA);

where pkbytes is an array of bytes that i've created from the file that content the public key
but when i execute the programm, i get an this exception
InvalidKeySpecException.Someone has an idea ?
thank you.
 
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