Oracle Database :: Encryption in Oracle , decryption in Java


	Encryption in Oracle , decryption in Java Hi I encountered a problem not sure how to solve it. please help if possible. in oracle9 I do a simple encryption (using DES) that gives me the following RAW: F26D94ECDACDBD111584C7A8A9018A5C when decrypted I get 36463643363133313332333333343335 which is correct. However in java when I try decrypting the 'F26D94ECDACDBD111584C7A8A9018A5C' I get this: 3646364336313331c15fa7dfe9f98e24 First 8 bytes are exactly the same, the other 8 bytes differ, why ? In Java I use the following code: Cipher dcipher = null; dcipher = Cipher.getInstance("DES/ECB/NoPadding"); SecretKey myKey = new SecretKeySpec(_key, "DES"); dcipher.init(_cryptMode, myKey); return dcipher.doFinal(_buffer); Obviously keys in both encryption and decryption are the same. Thanks for any hints. On May 10, 10:13 am, schw <schwa@alpha.net.pl> wrote: - Hide quoted text - > Hi > I encountered a problem not sure how to solve it. please help if > possible. > in oracle9 I do a simple encryption (using DES) that gives me the > following RAW: > F26D94ECDACDBD111584C7A8A9018A5C > when decrypted I get 36463643363133313332333333343335 which is > correct. > However in java when I try decrypting the > 'F26D94ECDACDBD111584C7A8A9018A5C' I get this: > 3646364336313331c15fa7dfe9f98e24 > First 8 bytes are exactly the same, the other 8 bytes differ, why ? > In Java I use the following code: > Cipher dcipher = null; > dcipher = Cipher.getInstance("DES/ECB/NoPadding"); > SecretKey myKey = new SecretKeySpec(_key, "DES"); > dcipher.init(_cryptMode, myKey); > return dcipher.doFinal(_buffer); > Obviously keys in both encryption and decryption are the same. > Thanks for any hints. Why would you decypher that data in a different place than the one you encrypted it in? Isn't that breaking the concept of a service? -----------------------------------------------Reply----------------------------------------------- On May 10, 6:13 pm, schw <schwa@alpha.net.pl> wrote: - Hide quoted text - > Hi > I encountered a problem not sure how to solve it. please help if > possible. > in oracle9 I do a simple encryption (using DES) that gives me the > following RAW: > F26D94ECDACDBD111584C7A8A9018A5C > when decrypted I get 36463643363133313332333333343335 which is > correct. > However in java when I try decrypting the > 'F26D94ECDACDBD111584C7A8A9018A5C' I get this: > 3646364336313331c15fa7dfe9f98e24 > First 8 bytes are exactly the same, the other 8 bytes differ, why ? > In Java I use the following code: > Cipher dcipher = null; > dcipher = Cipher.getInstance("DES/ECB/NoPadding"); > SecretKey myKey = new SecretKeySpec(_key, "DES"); > dcipher.init(_cryptMode, myKey); > return dcipher.doFinal(_buffer); > Obviously keys in both encryption and decryption are the same. > Thanks for any hints. I believe Oracle's implementation of DES in DBMS_OBFUSCATION_TOOLKIT uses CBC mode, not ECB. This is why the first 64-bit block comes out the same (the same initial state and key,) but all subsequent blocks differ. Try decrypting with Cipher.getInstance("DES/CBC/NoPadding"), this should work. Hth, Vladimir M. Zakharychev N-Networks, makers of Dynamic PSP(tm) http://www.dynamicpsp.com

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Encryption in Oracle , decryption in Java