DES and DES3 in CFB mode

[Paul Guyot]

Hello,

crypto application exposes DES and Triple DES in ECB and CBC mode, but not in CFB mode which is used in some protocols (Nagios' NSCA protocol for example). The following patch adds support for CFB mode:

git fetch git://github.com/pguyot/otp.git des-cfb-functions

It also fixes a typo in the crypto documentation and adds a test case for Triple DES in CBC mode.

Paul
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