package xchacha20poly1305 import ( "bytes" cr "crypto/rand" mr "math/rand" "testing" ) // The following test is taken from // https://github.com/golang/crypto/blob/master/chacha20poly1305/chacha20poly1305_test.go#L69 // It requires the below copyright notice, where "this source code" refers to the following function. // Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found at the bottom of this file. func TestRandom(t *testing.T) { // Some random tests to verify Open(Seal) == Plaintext for i := 0; i < 256; i++ { var nonce [24]byte var key [32]byte al := mr.Intn(128) pl := mr.Intn(16384) ad := make([]byte, al) plaintext := make([]byte, pl) _, err := cr.Read(key[:]) if err != nil { t.Errorf("error on read: %w", err) } _, err = cr.Read(nonce[:]) if err != nil { t.Errorf("error on read: %w", err) } _, err = cr.Read(ad) if err != nil { t.Errorf("error on read: %w", err) } _, err = cr.Read(plaintext) if err != nil { t.Errorf("error on read: %w", err) } aead, err := New(key[:]) if err != nil { t.Fatal(err) } ct := aead.Seal(nil, nonce[:], plaintext, ad) plaintext2, err := aead.Open(nil, nonce[:], ct, ad) if err != nil { t.Errorf("random #%d: Open failed", i) continue } if !bytes.Equal(plaintext, plaintext2) { t.Errorf("random #%d: plaintext's don't match: got %x vs %x", i, plaintext2, plaintext) continue } if len(ad) > 0 { alterAdIdx := mr.Intn(len(ad)) ad[alterAdIdx] ^= 0x80 if _, err := aead.Open(nil, nonce[:], ct, ad); err == nil { t.Errorf("random #%d: Open was successful after altering additional data", i) } ad[alterAdIdx] ^= 0x80 } alterNonceIdx := mr.Intn(aead.NonceSize()) nonce[alterNonceIdx] ^= 0x80 if _, err := aead.Open(nil, nonce[:], ct, ad); err == nil { t.Errorf("random #%d: Open was successful after altering nonce", i) } nonce[alterNonceIdx] ^= 0x80 alterCtIdx := mr.Intn(len(ct)) ct[alterCtIdx] ^= 0x80 if _, err := aead.Open(nil, nonce[:], ct, ad); err == nil { t.Errorf("random #%d: Open was successful after altering ciphertext", i) } ct[alterCtIdx] ^= 0x80 } } // AFOREMENTIONED LICENSE // Copyright (c) 2009 The Go Authors. All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.