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xts: avoid redundant bounds checks #302

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xts: avoid redundant bounds checks #302

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4 changes: 2 additions & 2 deletions xts/xts.go
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Original file line number Diff line number Diff line change
Expand Up @@ -87,7 +87,7 @@ func (c *Cipher) Encrypt(ciphertext, plaintext []byte, sectorNum uint64) {

c.k2.Encrypt(tweak[:], tweak[:])

for len(plaintext) > 0 {
for len(plaintext) >= blockSize && len(ciphertext) >= blockSize {
for j := range tweak {
ciphertext[j] = plaintext[j] ^ tweak[j]
}
Expand Down Expand Up @@ -126,7 +126,7 @@ func (c *Cipher) Decrypt(plaintext, ciphertext []byte, sectorNum uint64) {

c.k2.Encrypt(tweak[:], tweak[:])

for len(ciphertext) > 0 {
for len(ciphertext) >= blockSize && len(plaintext) >= blockSize {
for j := range tweak {
plaintext[j] = ciphertext[j] ^ tweak[j]
}
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7 changes: 4 additions & 3 deletions xts/xts_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -106,13 +106,14 @@ func TestShorterCiphertext(t *testing.T) {

func BenchmarkXTS(b *testing.B) {
b.ReportAllocs()
b.SetBytes(320)
c, err := NewCipher(aes.NewCipher, make([]byte, 32))
if err != nil {
b.Fatalf("NewCipher failed: %s", err)
}
plaintext := make([]byte, 32)
encrypted := make([]byte, 48)
decrypted := make([]byte, 48)
plaintext := make([]byte, 320)
encrypted := make([]byte, 336)
decrypted := make([]byte, 336)

for i := 0; i < b.N; i++ {
c.Encrypt(encrypted, plaintext, 0)
Expand Down