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chacha20_test.go
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chacha20_test.go
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// chacha20_test.go - test ChaCha20 implementation.
// By Ron Charlton, public domain, 2022-08-28.
package chacha20
import (
"bytes"
"crypto/cipher"
crand "crypto/rand"
"io"
"log"
"testing"
)
var _ io.Reader = &ChaCha20_ctx{}
var _ cipher.Stream = &ChaCha20_ctx{}
func TestChaCha20(t *testing.T) {
// IETF test vector for 20 rounds with a zero key and iv. Key length: 32
// See https://datatracker.ietf.org/doc/html/draft-strombergson-chacha-test-vectors-00
want := []byte{
// block 1
0x76, 0xb8, 0xe0, 0xad, 0xa0, 0xf1, 0x3d, 0x90,
0x40, 0x5d, 0x6a, 0xe5, 0x53, 0x86, 0xbd, 0x28,
0xbd, 0xd2, 0x19, 0xb8, 0xa0, 0x8d, 0xed, 0x1a,
0xa8, 0x36, 0xef, 0xcc, 0x8b, 0x77, 0x0d, 0xc7,
0xda, 0x41, 0x59, 0x7c, 0x51, 0x57, 0x48, 0x8d,
0x77, 0x24, 0xe0, 0x3f, 0xb8, 0xd8, 0x4a, 0x37,
0x6a, 0x43, 0xb8, 0xf4, 0x15, 0x18, 0xa1, 0x1c,
0xc3, 0x87, 0xb6, 0x69, 0xb2, 0xee, 0x65, 0x86,
// block 2
0x9f, 0x07, 0xe7, 0xbe, 0x55, 0x51, 0x38, 0x7a,
0x98, 0xba, 0x97, 0x7c, 0x73, 0x2d, 0x08, 0x0d,
0xcb, 0x0f, 0x29, 0xa0, 0x48, 0xe3, 0x65, 0x69,
0x12, 0xc6, 0x53, 0x3e, 0x32, 0xee, 0x7a, 0xed,
0x29, 0xb7, 0x21, 0x76, 0x9c, 0xe6, 0x4e, 0x43,
0xd5, 0x71, 0x33, 0xb0, 0x74, 0xd8, 0x39, 0xd5,
0x31, 0xed, 0x1f, 0x28, 0x51, 0x0a, 0xfb, 0x45,
0xac, 0xe1, 0x0a, 0x1f, 0x4b, 0x79, 0x4d, 0x6f,
}
got := make([]byte, 128)
key := make([]byte, 32)
iv := make([]byte, 8)
ctx := New(key, iv)
ctx.Encrypt(got, got)
if !bytes.Equal(got, want) {
t.Errorf("Encrypt(), got %v\nwant %v", got, want)
}
// test piecewise encryption
ctx = New(key, iv)
out := make([]byte, 8)
zeros := make([]byte, 8)
got = []byte{}
for i := 0; i < len(want); i += 8 {
ctx.Encrypt(zeros, out)
got = append(got, out...)
}
if !bytes.Equal(got, want) {
t.Errorf("Encrypt() piecewise, got %v\nwant %v", got, want)
}
// Keystream should yield same result as Encrypt with input all zeros
ctx = New(key, iv)
ctx.Keystream(got)
if !bytes.Equal(got, want) {
t.Errorf("Keystream() got %v\nwant %v", got, want)
}
// Seek to block 0 should yield same result with Keystream
ctx.Seek(0)
ctx.Keystream(got)
if !bytes.Equal(got, want) {
t.Errorf("Keystream() after Seek(0) got %v\nwant %v", got, want)
}
// Test Read
ctx.Seek(0)
n, err := ctx.Read(got)
if err != nil {
t.Errorf("Read() err: got %v\nwant %v", err, nil)
}
if n != len(want) {
t.Errorf("Read() return length: got %d\nwant %d", n, len(want))
}
if !bytes.Equal(got, want) {
t.Errorf("Read() after Seek(0) got %v\nwant %v", got, want)
}
// Test Read for io.EOF when keystream is exhausted, then panic.
ctx.Seek(0xffffffffffffffff)
n, err = ctx.Read(got)
if err != io.EOF {
t.Errorf("Read() got %v want %v", err, io.EOF)
}
if n != blockLen {
t.Errorf("Read() return length at EOF: got %d\nwant %d", n, blockLen)
}
func() {
defer func() {
if r := recover(); r == nil {
t.Errorf("ChaCha20 did not panic for Read after EOF")
}
}()
ctx.Read(got[:1])
}()
// Seek to block 0 should yield same result with XORKeyStream
ctx.Seek(0)
got = make([]byte, 128)
ctx.XORKeyStream(got, got)
if !bytes.Equal(got, want) {
t.Errorf("XORKeyStream() after Seek(0) got %v\nwant %v", got, want)
}
// Do a simple encrypt/decrypt and verify they are complementary.
_, err = crand.Read(key)
if err != nil {
log.Fatalf("error from crypto/rand.Read: %v", err)
}
_, err = crand.Read(iv)
if err != nil {
log.Fatalf("error from crypto/rand.Read: %v", err)
}
ctx = New(key, iv)
m = make([]byte, 50000)
c := make([]byte, len(m))
crand.Read(m)
ctx.Encrypt(m, c)
// must decrypt with the same key and iv as used to encrypt
want = m
ctx = New(key, iv)
got = make([]byte, len(c))
ctx.Decrypt(c, got)
if !bytes.Equal(got, want) {
t.Errorf("simple enc/dec - got[:5]: %v; want[:5]: %v", got[:5], want[:5])
}
ctx.Seek(0)
}
// setup for benchmarks:
var m, c, key, iv, want, got []byte
var ctx *ChaCha20_ctx
func init() {
m = make([]byte, 5000000)
_, err := crand.Read(m)
if err != nil {
log.Fatalf("error from crypto/rand.Read: %v", err)
}
key = make([]byte, 32)
crand.Read(key)
iv = make([]byte, 8)
crand.Read(iv)
ctx = New(key, iv)
}
func BenchmarkChaCha_8rnds(b *testing.B) {
b.SetBytes(int64(len(m)))
ctx.SetRounds(8)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ctx.Encrypt(m, m)
}
}
func BenchmarkChaCha_12rnds(b *testing.B) {
b.SetBytes(int64(len(m)))
ctx.SetRounds(12)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ctx.Encrypt(m, m)
}
}
func BenchmarkChaCha_20rnds(b *testing.B) {
b.SetBytes(int64(len(m)))
ctx.SetRounds(20)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ctx.Encrypt(m, m)
}
}
func BenchmarkChaCha_Read(b *testing.B) {
b.SetBytes(int64(len(m)))
ctx.SetRounds(20)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ctx.Read(m)
}
}