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crypto/rand: better panic message for invalid Int argument. 

Also document the panic to be consistent with math/rand.

Fixes #5187.

R=golang-dev, dave, bradfitz, r
CC=golang-dev
https://golang.org/cl/8303043
This commit is contained in:
Rémy Oudompheng 2013-04-17 23:21:15 -07:00 committed by Brad Fitzpatrick
parent 24555c7b8c
commit b08a3164c0
1 changed files with 4 additions and 1 deletions
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5
src/pkg/crypto/rand/util.go
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@ -100,8 +100,11 @@ func Prime(rand io.Reader, bits int) (p *big.Int, err error) {
}
}
// Int returns a uniform random value in [0, max).
// Int returns a uniform random value in [0, max). It panics if max <= 0.
func Int(rand io.Reader, max *big.Int) (n *big.Int, err error) {
if max.Sign() <= 0 {
panic("crypto/rand: argument to Int is <= 0")
}
k := (max.BitLen() + 7) / 8
// b is the number of bits in the most significant byte of max.