AES Encryption -- Data type?

Hi, quick question for those of you who might have done this --

We're encrypting credit cards using AES encryption and trying to put
the value into a character field within SQL Server. This works
absolutely fine unless there the encryption routine puts a NULL
character anyplace within the resulting string; then it just chokes.

Anybody done this before? Is it a limitation of the column data type?
A limitation in the JDBC driver?

Thanks in advance

.

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