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* Try fixing bls * Minor improvement on makefile * Fix bls tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| package rand | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "encoding/binary" | ||
| mrand "math/rand" | ||
| "sync" | ||
| ) | ||
|
|
||
| type source struct{} | ||
|
|
||
| var lock sync.RWMutex | ||
| var _ mrand.Source64 = (*source)(nil) // #nosec G404 -- This ensures we meet the interface | ||
|
|
||
| // Seed does nothing when crypto/rand is used as source. | ||
| func (_ *source) Seed(_ int64) {} | ||
|
|
||
| // Int63 returns uniformly-distributed random (as in CSPRNG) int64 value within [0, 1<<63) range. | ||
| // Panics if random generator reader cannot return data. | ||
| func (s *source) Int63() int64 { | ||
| return int64(s.Uint64() & ^uint64(1<<63)) | ||
| } | ||
|
|
||
| // Uint64 returns uniformly-distributed random (as in CSPRNG) uint64 value within [0, 1<<64) range. | ||
| // Panics if random generator reader cannot return data. | ||
| func (_ *source) Uint64() (val uint64) { | ||
| lock.RLock() | ||
| defer lock.RUnlock() | ||
| if err := binary.Read(rand.Reader, binary.BigEndian, &val); err != nil { | ||
| panic(err) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| // Rand is alias for underlying random generator. | ||
| type Rand = mrand.Rand // #nosec G404 | ||
|
|
||
| // NewGenerator returns a new generator that uses random values from crypto/rand as a source | ||
| // (cryptographically secure random number generator). | ||
| // Panics if crypto/rand input cannot be read. | ||
| // Use it for everything where crypto secure non-deterministic randomness is required. Performance | ||
| // takes a hit, so use sparingly. | ||
| func NewGenerator() *Rand { | ||
| return mrand.New(&source{}) // #nosec G404 -- excluded | ||
| } |