67 lines
1.1 KiB
Go
67 lines
1.1 KiB
Go
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package ar
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/ethcrypto"
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"github.com/ethereum/go-ethereum/ethutil"
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)
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var b = big.NewInt
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type Node interface {
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Big() *big.Int
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}
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type ByteNode []byte
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func (self ByteNode) Big() *big.Int {
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return ethutil.BigD(ethutil.Encode([]byte(self)))
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}
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func Sha3(v interface{}) *big.Int {
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if b, ok := v.(*big.Int); ok {
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return ethutil.BigD(ethcrypto.Sha3(b.Bytes()))
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} else if b, ok := v.([]interface{}); ok {
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return ethutil.BigD(ethcrypto.Sha3(ethutil.Encode(b)))
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} else if s, ok := v.([]*big.Int); ok {
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v := make([]interface{}, len(s))
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for i, b := range s {
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v[i] = b
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}
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return ethutil.BigD(ethcrypto.Sha3(ethutil.Encode(v)))
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}
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return nil
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}
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type NumberGenerator interface {
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rand(r *big.Int) *big.Int
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rand64(r int64) *big.Int
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}
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type rnd struct {
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seed *big.Int
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}
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func Rnd(s *big.Int) rnd {
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return rnd{s}
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}
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func (self rnd) rand(r *big.Int) *big.Int {
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o := b(0).Mod(self.seed, r)
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self.seed.Div(self.seed, r)
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if self.seed.Cmp(ethutil.BigPow(2, 64)) < 0 {
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self.seed = Sha3(self.seed)
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}
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return o
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}
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func (self rnd) rand64(r int64) *big.Int {
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return self.rand(b(r))
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}
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