Discuss two functions of hashing.

Discuss two functions of hashing. Why are these functions important and what value can they potentially bring to a criminal case? Discuss the importance of integrity verification and how hashing helps in this initiative. How does the hash value provide integrity for an image or forensic copy? Specifically discuss how this could be valuable for digital evidence. Explain why validation of hashing tools becomes important, and how the validation is different between the use of two different tools.