1.不加salt時每次生成的都不一樣，
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 123
$1$lOalq.sV$sxYaSp6B8Gtip0kadzlxs1
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 123
$1$GXY8SgIu$S41R21wFihw/d72blrruF0
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 123
$1$Zc15MP5P$GLzhQAhzY4yRpoqy6I3xQ1
2.加salt時每次生成的都一樣：=======salt：加密時加點鹽，可以增加算法的複雜度。但加了鹽會有副作用：鹽相同，密碼也相同，則加密的結果將一樣。
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 -salt liuxd 123
$1$liuxd$YDg1a6gDTT41Kg4xPuZKv1
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 -salt liuxd 123
$1$liuxd$YDg1a6gDTT41Kg4xPuZKv1
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 -salt liuxd 123
$1$liuxd$YDg1a6gDTT41Kg4xPuZKv1
shane@ubuntu:~/newdisk4/qtcreater/zlg-qt-4.8.6/qt-everywhere-opensource-src-4.8.6/examples/desktop/screenshot$ openssl passwd -1 -salt liuxd 123
$1$liuxd$YDg1a6gDTT41Kg4xPuZKv1