MD5 (FB)¶

FUNCTION_BLOCK MD5

Function calculates the MD5 checksum of given “MemoryBlock” with “udiNumberOfBytes” bytes. The used algorithm of MD5 Message-Digest is descibed in RFC1321.

Prefix: “memmd5”.

Example:

sTest : string := 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
->
abyDigest[0] = 16#D1
abyDigest[1] = 16#74
abyDigest[2] = 16#AB
abyDigest[3] = 16#98
abyDigest[4] = 16#D2
abyDigest[5] = 16#77
abyDigest[6] = 16#D9
abyDigest[7] = 16#F5
abyDigest[8] = 16#A5
abyDigest[9] = 16#61
abyDigest[10] = 16#1C
abyDigest[11] = 16#2C
abyDigest[12] = 16#9F
abyDigest[13] = 16#41
abyDigest[14] = 16#9D
abyDigest[15] = 16#9F

InOut:

Scope	Name	Type	Comment
Input	xExecute	BOOL	rising edge starts calculation of “abyDigest”
	pMemoryBlock	POINTER TO BYTE	address of memory block
	udiNumberOfBytes	UDINT	number of bytes of memory block
Output	xDone	BOOL	calculation of abyDigest done
	xBusy	BOOL	calculation busy
	abyDigest	ARRAY [0..15] OF BYTE	MD5 digest

Structure: