<html><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"><style>body { line-height: 1.5; }body { font-size: 10.5pt; font-family: ??; color: rgb(0, 0, 0); line-height: 1.5; }</style></head><body>
<div><span></span>hi,all</div><div> why we use sha256 instead md5 in chunk based backup-driver , in the current file chunkeddriver.py, we have <span style="background-color: rgba(0, 0, 0, 0); font-size: 10.5pt; line-height: 1.5;">object_sha256['sha256s'] list to store all the sha256 value of</span><span style="line-height: 1.5;"> </span><span style="orphans: 2; widows: 2; line-height: 1.5;">sha_block_size data , why we do not use md5 ,md5 is faster compute than sha256,and we all use the md5 value in </span><span style="background-color: rgba(0, 0, 0, 0); font-size: 10.5pt; line-height: 1.5;">_backup_chunk too, so we just need to compute one time and used in two diffrent place,it save much time</span></div>
<div><br></div><hr style="width: 210px; height: 1px;" color="#b5c4df" size="1" align="left">
<div><span><div style="MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><div>yuliyang@cmss.chinamobile.com</div></div></span></div>
</body></html>