from nx_crypto_cbc.h:80
UINT _nx_crypto_cbc_decrypt(VOID *crypto_metadata,
NX_CRYPTO_CBC *cbc_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
UCHAR *input,
UCHAR *output,
UINT length,
UCHAR block_size);
Implemented in nx_crypto_cbc.c:229