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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Entropy generates fully deterministic, cost-effective, and hard to guess | ||
| // numbers. | ||
| // | ||
| // It is designed both for single-usage, like seeding math/rand or for being | ||
| // reused which increases the entropy and its cost effectiveness. | ||
| // | ||
| // Disclaimer: this package is unsafe and won't prevent others to guess values | ||
| // in advance. | ||
| // | ||
| // It uses the Bernstein's hash djb2 to be CPU-cycle efficient. | ||
| package entropy | ||
|
|
||
| import ( | ||
| "math" | ||
| "std" | ||
| "time" | ||
| ) | ||
|
|
||
| type Instance struct { | ||
| value uint32 | ||
| } | ||
|
|
||
| func New() *Instance { | ||
| r := Instance{value: 5381} | ||
| r.addEntropy() | ||
| return &r | ||
| } | ||
|
|
||
| func FromSeed(seed uint32) *Instance { | ||
| r := Instance{value: seed} | ||
| r.addEntropy() | ||
| return &r | ||
| } | ||
|
|
||
| func (i *Instance) Seed() uint32 { | ||
| return i.value | ||
| } | ||
|
|
||
| func (i *Instance) djb2String(input string) { | ||
| for _, c := range input { | ||
| i.djb2Uint32(uint32(c)) | ||
| } | ||
| } | ||
|
|
||
| // super fast random algorithm. | ||
| // http://www.cse.yorku.ca/~oz/hash.html | ||
| func (i *Instance) djb2Uint32(input uint32) { | ||
| i.value = (i.value << 5) + i.value + input | ||
| } | ||
|
|
||
| // AddEntropy uses various runtime variables to add entropy to the existing seed. | ||
| func (i *Instance) addEntropy() { | ||
| // FIXME: reapply the 5381 initial value? | ||
|
|
||
| // inherit previous entropy | ||
| // nothing to do | ||
|
|
||
| // handle callers | ||
| { | ||
| caller1 := std.GetCallerAt(1).String() | ||
| i.djb2String(caller1) | ||
| caller2 := std.GetCallerAt(2).String() | ||
| i.djb2String(caller2) | ||
| } | ||
|
|
||
| // height | ||
| { | ||
| height := std.GetHeight() | ||
| if height >= math.MaxUint32 { | ||
| height -= math.MaxUint32 | ||
| } | ||
| i.djb2Uint32(uint32(height)) | ||
| } | ||
|
|
||
| // time | ||
| { | ||
| secs := time.Now().Second() | ||
| i.djb2Uint32(uint32(secs)) | ||
| nsecs := time.Now().Nanosecond() | ||
| i.djb2Uint32(uint32(nsecs)) | ||
| } | ||
|
|
||
| // FIXME: compute other hard-to-guess but deterministic variables, like real gas? | ||
| } | ||
|
|
||
| func (i *Instance) Value() uint32 { | ||
| i.addEntropy() | ||
| return i.value | ||
| } |
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