Android JNI string encryption/decryption?

You provide a key that is 72 bits long (9 characters x 8 bits). But it needs to be 128 bit longs (as you specify in the call to AES_set_encrypt_key ). Thus the missing 56 bits will be more or less random (depending on what's next to the ukey array).

You are using the low level encryption modes of OpenSSL. Your troubles are likely to vanish if you use the higher level EVP_* methods, e.g. For AES/CBC mode encryption. See also this related question.

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