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big: add random number generation
Adds func (z *Int) RandIntn(src rand.Source,n *Int) *Int R=rsc CC=golang-dev, gri https://golang.org/cl/2315045
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@ -6,8 +6,10 @@
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package big
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import "fmt"
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import (
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"fmt"
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"rand"
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)
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// An Int represents a signed multi-precision integer.
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// The zero value for an Int represents the value 0.
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@ -545,6 +547,18 @@ func ProbablyPrime(z *Int, n int) bool {
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}
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// Rand sets z to a pseudo-random number in [0, n) and returns z.
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func (z *Int) Rand(rnd *rand.Rand, n *Int) *Int {
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z.neg = false
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if n.neg == true || len(n.abs) == 0 {
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z.abs = nil
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return z
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}
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z.abs = z.abs.random(rnd, n.abs, n.abs.bitLen())
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return z
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}
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// ModInverse sets z to the multiplicative inverse of g in the group ℤ/pℤ (where
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// p is a prime) and returns z.
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func (z *Int) ModInverse(g, p *Int) *Int {
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