1 files changed, 0 insertions, 137 deletions
diff --git a/vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/xts/xts.go b/vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/xts/xts.go
deleted file mode 100644
index 92cbce99b..000000000
--- a/vendor/github.com/miekg/dns/vendor/golang.org/x/crypto/xts/xts.go
+++ /dev/null
@@ -1,137 +0,0 @@
-// Copyright 2012 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package xts implements the XTS cipher mode as specified in IEEE P1619/D16.
-//
-// XTS mode is typically used for disk encryption, which presents a number of
-// novel problems that make more common modes inapplicable. The disk is
-// conceptually an array of sectors and we must be able to encrypt and decrypt
-// a sector in isolation. However, an attacker must not be able to transpose
-// two sectors of plaintext by transposing their ciphertext.
-//
-// XTS wraps a block cipher with Rogaway's XEX mode in order to build a
-// tweakable block cipher. This allows each sector to have a unique tweak and
-// effectively create a unique key for each sector.
-//
-// XTS does not provide any authentication. An attacker can manipulate the
-// ciphertext and randomise a block (16 bytes) of the plaintext.
-//
-// (Note: this package does not implement ciphertext-stealing so sectors must
-// be a multiple of 16 bytes.)
-package xts // import "golang.org/x/crypto/xts"
-
-import (
-	"crypto/cipher"
-	"encoding/binary"
-	"errors"
-)
-
-// Cipher contains an expanded key structure. It doesn't contain mutable state
-// and therefore can be used concurrently.
-type Cipher struct {
-	k1, k2 cipher.Block
-}
-
-// blockSize is the block size that the underlying cipher must have. XTS is
-// only defined for 16-byte ciphers.
-const blockSize = 16
-
-// NewCipher creates a Cipher given a function for creating the underlying
-// block cipher (which must have a block size of 16 bytes). The key must be
-// twice the length of the underlying cipher's key.
-func NewCipher(cipherFunc func([]byte) (cipher.Block, error), key []byte) (c *Cipher, err error) {
-	c = new(Cipher)
-	if c.k1, err = cipherFunc(key[:len(key)/2]); err != nil {
-		return
-	}
-	c.k2, err = cipherFunc(key[len(key)/2:])
-
-	if c.k1.BlockSize() != blockSize {
-		err = errors.New("xts: cipher does not have a block size of 16")
-	}
-
-	return
-}
-
-// Encrypt encrypts a sector of plaintext and puts the result into ciphertext.
-// Plaintext and ciphertext must overlap entirely or not at all.
-// Sectors must be a multiple of 16 bytes and less than 2²⁴ bytes.
-func (c *Cipher) Encrypt(ciphertext, plaintext []byte, sectorNum uint64) {
-	if len(ciphertext) < len(plaintext) {
-		panic("xts: ciphertext is smaller than plaintext")
-	}
-	if len(plaintext)%blockSize != 0 {
-		panic("xts: plaintext is not a multiple of the block size")
-	}
-
-	var tweak [blockSize]byte
-	binary.LittleEndian.PutUint64(tweak[:8], sectorNum)
-
-	c.k2.Encrypt(tweak[:], tweak[:])
-
-	for len(plaintext) > 0 {
-		for j := range tweak {
-			ciphertext[j] = plaintext[j] ^ tweak[j]
-		}
-		c.k1.Encrypt(ciphertext, ciphertext)
-		for j := range tweak {
-			ciphertext[j] ^= tweak[j]
-		}
-		plaintext = plaintext[blockSize:]
-		ciphertext = ciphertext[blockSize:]
-
-		mul2(&tweak)
-	}
-}
-
-// Decrypt decrypts a sector of ciphertext and puts the result into plaintext.
-// Plaintext and ciphertext must overlap entirely or not at all.
-// Sectors must be a multiple of 16 bytes and less than 2²⁴ bytes.
-func (c *Cipher) Decrypt(plaintext, ciphertext []byte, sectorNum uint64) {
-	if len(plaintext) < len(ciphertext) {
-		panic("xts: plaintext is smaller than ciphertext")
-	}
-	if len(ciphertext)%blockSize != 0 {
-		panic("xts: ciphertext is not a multiple of the block size")
-	}
-
-	var tweak [blockSize]byte
-	binary.LittleEndian.PutUint64(tweak[:8], sectorNum)
-
-	c.k2.Encrypt(tweak[:], tweak[:])
-
-	for len(ciphertext) > 0 {
-		for j := range tweak {
-			plaintext[j] = ciphertext[j] ^ tweak[j]
-		}
-		c.k1.Decrypt(plaintext, plaintext)
-		for j := range tweak {
-			plaintext[j] ^= tweak[j]
-		}
-		plaintext = plaintext[blockSize:]
-		ciphertext = ciphertext[blockSize:]
-
-		mul2(&tweak)
-	}
-}
-
-// mul2 multiplies tweak by 2 in GF(2¹²⁸) with an irreducible polynomial of
-// x¹²⁸ + x⁷ + x² + x + 1.
-func mul2(tweak *[blockSize]byte) {
-	var carryIn byte
-	for j := range tweak {
-		carryOut := tweak[j] >> 7
-		tweak[j] = (tweak[j] << 1) + carryIn
-		carryIn = carryOut
-	}
-	if carryIn != 0 {
-		// If we have a carry bit then we need to subtract a multiple
-		// of the irreducible polynomial (x¹²⁸ + x⁷ + x² + x + 1).
-		// By dropping the carry bit, we're subtracting the x^128 term
-		// so all that remains is to subtract x⁷ + x² + x + 1.
-		// Subtraction (and addition) in this representation is just
-		// XOR.
-		tweak[0] ^= 1<<7 | 1<<2 | 1<<1 | 1
-	}
-}