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You define licdata as a variable, but you never initialize it with any value. Did this happen when you copy&pasted the code to publish it here or does you source code really use the variable without initializing it?
RC6 is a block chiper, but I don't see a "length" field anywhere. Are you sure the block your are passing has the correct length?
You use intRC6Decrypt in one proc, but RC6Decrypt in the other. Did you check if both produce the same output using the same input data?
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