File decryption error with RSA algorithm?

Asked Jun 08 '13 at 16:35

Active May 27 '23 at 01:24

Viewed 148 times

I have a given encrypted text and I want to decrypt it with given private key file.

I wrote this code

ObjectInputStream inputStream = new ObjectInputStream( new FileInputStream( PRIVATE_KEY_FILE ) ) ;
PrivateKey privateKey  = (PrivateKey) inputStream.readObject() ;
Cipher cipher      = Cipher.getInstance( "RSA" ) ;
cipher.init( Cipher.DECRYPT_MODE , privateKey ) ;
byte[] decryptedText = cipher.doFinal( dText ) ;  //this is line 56

I gets this error whenever I run my code.

Exception in thread "main" javax.crypto.BadPaddingException: Blocktype mismatch: 0
        at sun.security.rsa.RSAPadding.unpadV15(RSAPadding.java:328)
        at sun.security.rsa.RSAPadding.unpad(RSAPadding.java:272)
        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:2087)
        at RSADecryption.decrypt(RSADecryption.java:56)
        at RSADecryption.main(RSADecryption.java:73)

How can I get rid of this error?

edited May 27 '23 at 01:24

halfer

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asked Jun 08 '13 at 16:35

ibrahim

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ALGORITHM="RSA" as I mention in question name – ibrahim Jun 08 '13 at 19:08
@ibrahim `ALGORITHM` may have contained padding information. Your question title was not enough to leave me confident of what you were doing. – Duncan Jones Jun 10 '13 at 07:42
Can you post the encryption code too? If not, can you post a description of how you've been told the text was encrypted? – Duncan Jones Jun 10 '13 at 07:45
I solved my problem. It was about dText. I initialized it wrong – ibrahim Jun 12 '13 at 08:55

File decryption error with RSA algorithm?

0 Answers0