CFB1 block mode does not work

[kares]

... due BC not really supporting CFB-1 : http://www.bouncycastle.org/jira/browse/BJA-530

attempts to use such JCE Cipher instance will end as java.lang.ArithmeticException: / by zero

java.lang.ArithmeticException: / by zero
    at org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher.getUpdateOutputSize(Unknown Source)
    at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher$BufferedGenericBlockCipher.getUpdateOutputSize(Unknown Source)
    at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineUpdate(Unknown Source)
    at javax.crypto.Cipher.update(Cipher.java:1714)
    at org.jruby.ext.openssl.Cipher.update(Cipher.java:1092)

originally reported as #31

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