add forking script

examples/stadtx/stadtx.go

@@ -1,3 +1,64 @@
+// Downloaded from 'https://github.com/dgryski/go-stadtx/raw/3c3d9b328c24a9b5ecd370654cd6e9d60a85752d/stadtx.go'. DO NOT EDIT.
+
+// Package stadtx implements Stadtx Hash
+/*
+
+   https://github.com/demerphq/BeagleHash
+
+*/
 package stadtx
 
+func rotl64(x uint64, r uint64) uint64 {
+	return (((x) << (r)) | ((x) >> (64 - r)))
+}
+
+func rotr64(x uint64, r uint64) uint64 {
+	return (((x) >> (r)) | ((x) << (64 - r)))
+}
+
+func scramble64(v, prime uint64) uint64 {
+	v ^= (v >> 13)
+	v ^= (v << 35)
+	v ^= (v >> 30)
+	v *= prime
+	v ^= (v >> 19)
+	v ^= (v << 15)
+	v ^= (v >> 46)
+	return v
+}
+
+func SeedState(seed []uint64) State {
+
+	var state State
+
+	state[0] = seed[0] ^ 0x43f6a8885a308d31
+	state[1] = seed[1] ^ 0x3198a2e03707344a
+	state[2] = seed[0] ^ 0x4093822299f31d00
+	state[3] = seed[1] ^ 0x82efa98ec4e6c894
+
+	if state[0] == 0 {
+		state[0] = 1
+	}
+	if state[1] == 0 {
+		state[1] = 2
+	}
+	if state[2] == 0 {
+		state[2] = 4
+	}
+	if state[3] == 0 {
+		state[3] = 8
+	}
+
+	state[0] = scramble64(state[0], 0x801178846e899d17)
+	state[0] = scramble64(state[0], 0xdd51e5d1c9a5a151)
+	state[1] = scramble64(state[1], 0x93a7d6c8c62e4835)
+	state[1] = scramble64(state[1], 0x803340f36895c2b5)
+	state[2] = scramble64(state[2], 0xbea9344eb7565eeb)
+	state[2] = scramble64(state[2], 0xcd95d1e509b995cd)
+	state[3] = scramble64(state[3], 0x9999791977e30c13)
+	state[3] = scramble64(state[3], 0xaab8b6b05abfc6cd)
+
+	return state
+}
+
 type State [4]uint64