A fingerprint value that can be used to uniquely reference
other data of potentially arbitrary length.
A tls-fingerprint value is composed of a 1-octet hashing
algorithm identifier followed by the fingerprint value. The
first octet value identifying the hashing algorithm is taken
from the IANA 'TLS HashAlgorithm Registry' (RFC 5246). The
remaining octets are filled using the results of the hashing
algorithm.