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: