Thank you @scle, I used your link to get S1 but I don't get it, I get something like this
S1 = 88c4edb6b6f3c717b8b6dfecab62659b20d739c3f2e3b27991b4a56b9130379d9e8e9893b2eb3102faf588afe0fef2f7f270cdc7ad603445b32e086a713a8a0cf2f02c4160403a46270d3204997c6093