Fix mcrypt error
Fix mcrypt error

I was getting a the folowing down here:

    mcrypt_encrypt(): Key of size 36 not supported by this
    algorithm. Only keys of sizes 16, 24 or 32 supported

andersonfraga/pucrs_prescricoes,andersonfraga/pucrs_prescricoes,andersonfraga/pucrs_prescricoes,andersonfraga/prescricoes_pucrs,andersonfraga/prescricoes_pucrs,andersonfraga/prescricoes_pucrs,andersonfraga/prescricoes_pucrs,andersonfraga/pucrs_prescricoes