sh2 - SHA-256 module

Module Description

The sh2 module implements the SHA-256 algorithm.

Module Words

SHA-256 structure

sh2% ( -- n )
Get the required space for a sha2 variable

SHA-256 variable creation, initialisation and cleanup

sh2-init ( sh2 -- )
Initialise the sh2 variable

sh2-create ( "<spaces>name" -- ; -- sh2 )
Create a named SHA-256 variable in the dictionary

sh2-new ( -- sh2 )
Create a new SHA-256 variable on the heap

sh2-free ( sh2 -- )
Free the SHA-256 variable from the heap

SHA-256 words

sh2-reset ( sh2 -- )
Reset the SHA-256 state

sh2-update ( c-addr u sh2 -- )
Update the SHA-256 with more data c-addr u

sh2-finish ( sh2 -- u1 u2 u3 u4 u5 u6 u7 u8 )
Finish the SHA-256 calculation, return the result

sh2+to-string ( u1 u2 u3 u4 u5 u6 u7 u8 -- c-addr u )
Convert SHA-256 result to the string c-addr u, using the pictured output area

Inspection

sh2-dump ( sh2 -- )
Dump the sh2 variable

Examples

include ffl/sh2.fs

\ Create a SHA-256 variable sh1 in the dictionary

sh2-create sh1

\ Update the variable with data

s" The quick brown fox jumps over the lazy dog" sh1 sh2-update

\ Finish the SHA-256 calculation resulting in 8 unsigned 32 bit words
\ on the stack representing the hash value

sh1 sh2-finish

\ Convert the hash value to a hex string and print

sh2+to-string type cr



\ Create a SHA-256 variable on the heap

sh2-new value sh2

\ Update the variable with multiple data

s" The quick brown fox " sh2 sh2-update
s" jumps over the lazy dog" sh2 sh2-update

\ Finish the calculation

sh2 sh2-finish

\ Convert the hash value to a hex string and print

sh2+to-string type cr

\ Free the variable from the heap

sh2 sh2-free
generated 10-Apr-2008 by ofcfrth-0.5.0