The function CRCofData calculates a 256-bit CRC code over all cells of the matrix. This CRC code is returned as a hexadecimal string of 64 characters.
Hint:
Please note that the CRC code cannot be unique but there is only an extremely small chance to get a hash code collision. Thus the CRC code can be used to check whether two matrices are different (if the CRCs differ the matrices must be different), however there is a very small chance that the CRCs of different matrices are equal.