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61 lines
1.5 KiB
61 lines
1.5 KiB
/* |
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* Spreed WebRTC. |
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* Copyright (C) 2013-2015 struktur AG |
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* |
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* This file is part of Spreed WebRTC. |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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package main |
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import ( |
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"crypto/rand" |
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"math/big" |
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pseudoRand "math/rand" |
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"time" |
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) |
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const ( |
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dict = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" |
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) |
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// NewRandomInt returns a random integer in range [0, max[ |
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// Tries to use crypto/rand and falls back to math/rand |
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func NewRandomInt(max int) int { |
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rand, err := rand.Int(rand.Reader, big.NewInt(int64(max))) |
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if err != nil { |
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// Fallback to pseudo-random |
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return pseudoRand.Intn(max) |
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} |
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return int(rand.Int64()) |
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} |
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func NewRandomString(length int) string { |
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buf := make([]byte, length) |
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for i := 0; i < length; i++ { |
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buf[i] = dict[NewRandomInt(len(dict))] |
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} |
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return string(buf) |
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} |
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func init() { |
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// Make sure to seed default random generator. |
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pseudoRand.Seed(time.Now().UTC().UnixNano()) |
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}
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