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Why not using VeraCrypt http://en.wikipedia.org/wiki/VeraCrypt, which is a successor of the famous discontinuited TrueCrypt. VeraCrypt is open source, and was developped by M. Idrassi an crypto-expert, take a look at https://github.com/veracrypt/VeraCrypt . There was controversy about the TrueCrypt, mysterious stoping. VeraCrypt corrected some know flaws and ...


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You performed the matrix component of the affine tranformation correctly, what you did wrong was the addition of the vector prior to field inversion. The value 10100010 (0xA2) is the correct result of the inverse affine matrix. The final vector of the inverse affine transform however is 00000101 (0x05). The resultant 0xA7 is then inverted, which is 0x48, ...


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Not a definite answer but too much for comments: That help msg shows that OpenSSL on OSX is an old version (<= 0.9.8) before GCM was added. (Probably =; 0.9.7 end-of-lifed around 2008. -salt has been the default since about 2004 so anyone who claims you need to specify it should be treated very skeptically.) You could add HMAC on top of AES-CBC ...



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