unique hash of string

问题:

I want to create a unique hash (16 chars long) of an arbitrary length String. Is there a good library that implements MD5 or SHA-1 for C++ with which I can achieve this? (and possibly an example of how to use it)

回答1:

The Pigeonhole Principle explains why what you ask is impossible regarding uniqueness.

回答2:

You need the openssl library. It has implementations of the standard crypto hashes for this purpose.

回答3:

nss provides a number of hash and cryptographic algorithms and has a more liberal license than OpenSSL.