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