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From: Florian Weimer <fw@deneb.enyo.de>
To: Karthik Segpi <karthik.segpi@gmail.com>
Cc: pgsql-interfaces@postgresql.org
Subject: Re: PQunescapebytea not reverse of PQescapebytea?
Date: Wed, 19 Mar 2014 21:28:07 +0100
Message-ID: <87bnx20w88.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <CACD7L9GCLsM=wEwwH707sN19dMkMHwHh+ffVmLQdsFXNR0UJ6Q@mail.gmail.com>
References: <CACD7L9GCLsM=wEwwH707sN19dMkMHwHh+ffVmLQdsFXNR0UJ6Q@mail.gmail.com>
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* Karthik Segpi:

> I have a 'bytea' column in the database, onto which my custom C application
> is inserting encrypted data. Before inserting, I am calling
> 'PQescapebytea()' to escape the ciphertext. However, after SELECT, the data
> needs to be 'un-escaped' before attempting to decrypt. I am trying to
> 'un-escape' using 'PQunescapebytea'. However, I am finding that
> 'PQunescapebytea' is not  exact inverse of 'PQescapebytea'. I saw
> documentation and posts in the mailing lists alluding to this as well. As a
> result, the decryption always fails.

Can you show us some example data that shows the inconsistency?
PQunescapebytea should give you back the blob you passed to
PQescapebytea, but the same blob can have different BYTEA
encodings—not everyone uses the \x hexadecimal encoding.


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