Just a guess, without knowing Ruby's OpenSSL interface.
Just a guess, without knowing Ruby's OpenSSL interface: You give the keys and initialization vector to the command line OpenSSL in hexadecimal encoding. E.g. Your key and initialization vector are 0x000.... I suppose your Ruby library takes the key and initialization vector as binary data, e.
G you are actually passing a key and initialization vector consisting of 0x30303030... (assuming ASCII or anything compatible to it) instead of 0x00000....
1 You do not specify padding for the SSL Command Line. It is possible that the default padding is different, hence a different encrypted block. – rossum Sep 19 at 17:27.
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