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POneed Help in RSA ENCRYPTION(doFinal)
 

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  1. POneed Help in RSA ENCRYPTION(doFinal)
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    <p>i am trying to encrypt and decrypt a string using RSA algorithm. Here the encryption is working good but problem is in decryption. the code gets terminated when it reaches the doFinal in DECRYPT method. Am i taking the input wrong or is there any problem with public and private keys? please give me suggestions regarding this. Thank u.</p> <pre><code>public class rsa { private KeyPair keypair; public rsa() throws NoSuchAlgorithmException, NoSuchProviderException { KeyPairGenerator keygenerator = KeyPairGenerator.getInstance("RSA"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN"); keygenerator.initialize(1024, random); keypair = keygenerator.generateKeyPair(); } public String ENCRYPT(String Algorithm, String Data ) throws Exception { String alg = Algorithm; String data=Data; byte[] encrypted=new byte[2048]; if(alg.equals("RSA")) { PublicKey publicKey = keypair.getPublic(); Cipher cipher; cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); encrypted = cipher.doFinal(data.getBytes()); System.out.println("Encrypted String[RSA] -&gt; " + encrypted); } return encrypted.toString(); } public String DECRYPT(String Algorithm, String Data ) throws Exception { String alg = Algorithm; byte[] Decrypted=Data.getBytes(); if(alg.equals("RSA")) { PrivateKey privateKey = keypair.getPrivate(); Cipher cipher; cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] dec = cipher.doFinal(Decrypted); System.out.println("Decrypted String[RSA] -&gt; " + dec.toString()); } return Decrypted.toString(); } public static void main(String[] args) throws Exception { rsa RSA=new rsa(); RSA.ENCRYPT("RSA", "avinash"); RSA.DECRYPT("RSA","[B@cb7e2c"); } </code></pre> <p>}</p> <pre><code> got exception as Exception in thread "main" javax.crypto.BadPaddingException: Data must start with zero at sun.security.rsa.RSAPadding.unpadV15(Unknown Source) at sun.security.rsa.RSAPadding.unpad(Unknown Source) at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:356) at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:382) at javax.crypto.Cipher.doFinal(Cipher.java:2086) at EncryptionProvider.rsa.DECRYPT(rsa.java:56) at EncryptionProvider.rsa.main(rsa.java:68) </code></pre> <p>Encrypted String[RSA] -> [B@4a96a</p>
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    1. USAvinash
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    1. COgetting Exception as Data must start with zero.
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      1. POneed Help in RSA ENCRYPTION(doFinal)
      1. USAvinash
    2. COPlease post the verbatim error message.
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      1. POneed Help in RSA ENCRYPTION(doFinal)
      1. USMichael Petrotta
    3. COPost it in your question.
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      1. USMichael Petrotta
 

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