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// rand provides a convenient package to use crypto/rand as default
// but falls back to math/rand if necessary
package rand
import (
crand "crypto/rand"
mrand "math/rand"
"time"
)
var g_mathRand = mrand.New(mrand.NewSource(time.Now().Unix()))
// Read fills the slice with random bytes
func Read(xs []byte) {
length := len(xs)
n, err := crand.Read(xs)
if n != length || err != nil {
for length > 0 {
length--
xs[length] = byte(g_mathRand.Int31n(256))
}
}
}
// Int63 returns a non-negative 63-bit integer as an int64
func Int63() int64 {
xs := make([]byte, 8)
var n int64
Read(xs)
xs[0] &= 0x7F
for _, x := range xs {
n <<= 4
n |= int64(x)
}
return n
}
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