DESKeySpec to use string. Please help.

I apologize if this is in the wrong forum, but I need help. I have a program that uses some encryption. I have the following in my code:
DESKeySpec ks = new DESKeySpec(new byte[] { 0x01, 0x23, 0x45, 0x67, 0x01, 0x23, 0x45, 0x67 });
I would like to set these values to some custom values that can change. For example, if I have a string that contains 0x12 or just 12, how can I change the line above to read:
DESKeySpec ks = new DESKeySpec(new byte[] { 0x12, 0x23, 0x45, 0x67, 0x01, 0x23, 0x45, 0x67 });
Notice the first entry in the byte array has changed. Any and all help is appreciated.
James

That doesn't work because the value is currently assigned to a string. I can't assign that to a byte.
Even if I don't use the string and do like you suggested I get other errors. This line: myByte[0] = 0x12; gives me this error:
StoneURLLoginSetup.java:58: incompatible types
found : byte[]
required: byte
byte myByte = new byte[] { 0x01, 0x23, 0x45, 0x67, 0x01, 0x23, 0x45, 0x67 };
Any other ideas?
thanks,
James

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