God, this shit makes me laugh. Why are they doing this. But from Edit2: Your hash is some sort of base64 let str = "ME4wTKADAgEAMEUwQzBBMAkGBSsOAwIaBQA

God, this shit makes me laugh. Why are they doing this. But from Edit2: Your hash is some sort of base64 let str = "ME4wTKADAgEAMEUwQzBBMAkGBSsOAwIaBQAEFDOB0e_baLCFIU0u76+MSmlkPCpsBBRXF+2iz9x8mKEQ4Py+hy0s8uMXVAIIfYbtkeEKZsI=" Then we see weird random gaps in the alphabet used, not so weird, because not every character will be used in every string: Prelude Data.List> map head $ group $ sort $ str "+0246789=ABCDEFGIKLMOPQRSTUVXYZ_abefghiklmpstuwxyz" If we fill these up then: Prelude Data.List> let xs = "+0123456789=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz" Prelude Data.List> length xs 65 So base64 with some non standard symbols. I don't know what standard base64 is supposed to look to be honest, so perhaps it is standard base64. The = is definitely padding.