neo-go/internal/random/random_util.go

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package random
import (
"math/rand"
"time"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/util"
)
// String returns a random string with the n as its length.
func String(n int) string {
b := make([]byte, n)
for i := range b {
b[i] = byte(Int(65, 90))
}
return string(b)
}
// Bytes returns a random byte slice of specified length.
func Bytes(n int) []byte {
b := make([]byte, n)
Fill(b)
return b
}
// Fill fills buffer with random bytes.
func Fill(buf []byte) {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
// Rand reader returns no errors
r.Read(buf)
}
// Int returns a random integer in [min,max).
func Int(min, max int) int {
return min + rand.Intn(max-min)
}
// Uint256 returns a random Uint256.
func Uint256() util.Uint256 {
str := String(20)
return hash.Sha256([]byte(str))
}
// Uint160 returns a random Uint160.
func Uint160() util.Uint160 {
str := String(20)
return hash.RipeMD160([]byte(str))
}
func init() {
rand.Seed(time.Now().UTC().UnixNano())
}