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Diffstat (limited to 'src/pkg/crypto/rand/util.go')
| -rw-r--r-- | src/pkg/crypto/rand/util.go | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/pkg/crypto/rand/util.go b/src/pkg/crypto/rand/util.go index 21608dbac..0cd5e0e02 100644 --- a/src/pkg/crypto/rand/util.go +++ b/src/pkg/crypto/rand/util.go @@ -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. |