问题
I am developing an application in flex in which I need to calculate checksum of different files. I would like to know if there is a direct method in actionscript to calculate that or do I have to go for any external libraries?
Thanks in advance :)
回答1:
as3corelib maintained by Mike Chambers/Adobe, contains everything you probably need in its crypto section including:
- HMAC
- MD5
- MD5Stream
- SHA1
- SHA224
- SHA256
- WSSEUsernameTocken
回答2:
how do you use this as3corelib to perform a md5 on a file i.e. "c:\documents and settings\all user\desktop\demofile.xml" in php and c# you can md5files and get the checksum of the file - i also use md5summer to see if the outputted md5 is correct php and visual c# output the correct md5 however i cant find any easy tut that explains how to do this using flex / air / as3 nothing - i have imported the followinng libs.
import com.adobe.crypto.HMAC; import com.adobe.crypto.MD5; import com.adobe.crypto.SHA1; import com.adobe.crypto.SHA224; import com.adobe.crypto.SHA256; import com.adobe.crypto.MD5Stream;
i would have though that it would be md5stream be googling this turns up nought - please any help on how to do a simple md5 checksum of a local file would be great!!
回答3:
Check out this script. I think it will do what you have in mind:
http://code.google.com/p/queueloader-as3/source/browse/trunk/build/src/nochump/util/zip/CRC32.as?r=57
来源：https://stackoverflow.com/questions/3459953/how-to-calculate-crc-checksum-in-actionscript-3