package main import "core:fmt" import "core:slice" main :: proc () { next_secret: for secret in 0..=255 { fmt.printfln("Checking secret: %i", secret) for test in ([?] [2] int { { 1785818743, 995543 }, { 1785818761, 399222 }, { 1785818823, 988976 }, }) { if test[1] != otp_gen(test[0], secret) { continue next_secret } } fmt.println("Found! The result OTPs:") for timestamp in ([?] int { 123456789, 1798156817, 1798761646 }) { otp := otp_gen(timestamp, secret) fmt.printfln("%i: %i", timestamp, otp) } break } } otp_gen :: proc (timestamp: int, secret: int) -> int { ts := timestamp / 30 buf: [32] u8 str := fmt.bprint(buf[:], ts) slice.reverse(transmute ([] u8) str) value := ts + secret for c in str do if c != '0' do value *= int(c-'0') for (value/10)*10 == value do value /= 10 return value%1000000 }