[U-Boot] U-boot FIT Signature

Good morning,

I am working with FIT image in U-Boot 2013.07. I have configured the image verification with signed image and kernel boots fine so, I would like to know if I can store my public key in an external device (like crypto-memory or an i2c device) because I am storing the key in DBT with the CONFIG_OF_CONTROL configuration. The aim of this is that U-Boot should check the i2c address of my external device, read the public key and verify the signed image later. I work with am335x board and Kernel 3.14.

Thanks in advanced,