• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
  • Mikalai Zaikin

AES decryption problem

Posts: 1
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
We have provided an API to our clinet, which they use to encrypt the string and they will send the encrypted string as request parameter to our end.
On receiving the string we will decrypt the string before processing further.
But while decrypting we receive the below error.

Client use JDK 1.6 to encrypt and we use JDK 1.5 at our end to decrypt

javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)
at com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA12275)
at javax.crypto.Cipher.doFinal(DashoA12275)
at com.sbi.crypto.aes.EncryptAES.decrypt(EncryptAES.java:84)

Line 84 is byte [] ciphertext=cipher.doFinal(results);

Below is the code to encrypt

Below is the code to decrypt

Kindly help us.
Thanks in advance.
Ranch Hand
Posts: 781
Netbeans IDE Ubuntu Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Either the base64 encoded ciphertext is getting corrupted in some way or more likely the wrong key is being used for decryption. For test purposes you should dump the bytes of the key after reading them.

P.S. Using the bytes of the key as the IV is not considered good practice.
P.P.S. your code
can be replaced by the single line

P.P.P.S. That exception handling is poor. If you fail to read the key then it is fatal and you cannot continue!
Would anybody like some fudge? I made it an hour ago. And it goes well with a tiny ad ...
a bit of art, as a gift, the permaculture playing cards
    Bookmark Topic Watch Topic
  • New Topic