[Cryptix-users] errors in 3DES/TripleDES decryption.

[Steven L. <Ste...@Pr...>]

Hi all,

The verion of cryptix is cryptix-jce-20030217-snap.zip.

I'm using TripleDES for encryption/decryption.
Problems seem to arise when I try to decrypt.=20

It seems to fail sometimes with the following errors:

1.=20

java.lang.NegativeArraySizeException
	at
cryptix.jce.provider.cipher.BlockCipher.engineDoFinal(BlockCipher.java:3=
78)

2.=20
java.lang.ArrayIndexOutOfBoundsException
	at java.lang.System.arraycopy(Native Method)
	at
cryptix.jce.provider.cipher.BlockCipher.engineDoFinal(BlockCipher.java:3=
79)

3.
Or the decrypted text does not match the original encrypted text.

eg

original text  -- 5555264558486571
encrypted text -- ?=A8=A5o=1E:N=EE=BC>=7F=F6=3D*lOE%=E9=A7=D0=AC`=F2=F0
decrypted text -- =D2Yf?=BEC=D0-58486571

---------------

I wanted to use my own key for encryption, generating it using the
SecrtKeySpec. But the results caused the above, so I tried the =
KeyGenerator,
but with no better results. (code snippets below.)

------

static private final String ENCRYPTIONTYPE =3D "TripleDES";
byte [] keyData =3D shortKeyString.getBytes();
key =3D new SecretKeySpec(keyData,ENCRYPTIONTYPE);

where shortKeyString is a String of length 24.

----

static private final int des3KeyStrength =3D 168;
KeyGenerator keyGen =3D KeyGenerator.getInstance(ENCRYPTIONTYPE);
keyGen.init(des3KeyStrength);
key =3D keyGen.generateKey();

----

Does anyone know what is wrong? Is it something I have done?

Regards,

Steven.


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