OpenEuphoria

Re: Checksums, hashes, and digests, oh my!

• Posted by ghaberek (admin) Jan 18, 2022
• 1303 views

Cryptographic hash functions are used to verify the integrity or content of messages and files. They're typically used to store a one-way hash for validating passwords, or to check the integrity of a downloaded file.

This is one of those features that nearly anyone can and should be using when needed. Providing a standard, base-line implementation ensures most users don't have to hunt for code and re-invent the wheel.

I don't think so. We can accommodate the change in the standard library so std/map.e, etc. aren't affected and then mark hash() as deprecated in std/hash.e and then we can remove it entirely in a later version.

So std/hash.e would end up looking something like this:

constant 
    M_CHECKSUM = 98, 
    M_CALCHASH = 99 
 
public enum ADLER32, FLETCHER32, ... 
 
deprecate -- this will issue a warning if still used 
public function hash( object data_in, integer algo ) 
    return machine_func( M_CHECKSUM, {data_in,algo} ) 
end function 
 
public function checksum( object data_in, integer algo ) 
    return machine_func( M_CHECKSUM, {data_in,algo} ) 
end function 
 
public function adler32( object data_in ) 
    return machine_func( M_CHECKSUM, {data_in,ADLER32} ) 
end function 
 
public function fletcher32( object data_in ) 
    return machine_func( M_CHECKSUM, {data_in,FLETCHER32} ) 
end function 
 
-- etc. 
 
public enum MD5, SHA1, SHA256, ... 
 
public function calc_hash( sequence data_in, integer algo ) 
    return machine_func( M_CALCHASH, {data_in,algo} ) 
end function 
 
public function md5sum( sequence data_in ) 
    return machine_func( M_CALCHASH, {data_in,MD5} ) 
end function 
 
public function sha1sum( sequence data_in ) 
    return machine_func( M_CALCHASH, {data_in,SHA1} ) 
end function 
 
-- etc. 

There are plenty more algorithms that we could implement, but I think when we go from "common message digests" to "actual data cryptography" we should focus on providing an external library.

-Greg