Imported Upstream version 1.4upstream/1.4

1 files changed, 0 insertions, 133 deletions

diff --git a/src/pkg/crypto/cipher/cbc.go b/src/pkg/crypto/cipher/cbc.go
deleted file mode 100644
index 241e122ee..000000000
--- a/src/pkg/crypto/cipher/cbc.go
+++ /dev/null
@@ -1,133 +0,0 @@
-// Copyright 2009 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.
-
-// Cipher block chaining (CBC) mode.
-
-// CBC provides confidentiality by xoring (chaining) each plaintext block
-// with the previous ciphertext block before applying the block cipher.
-
-// See NIST SP 800-38A, pp 10-11
-
-package cipher
-
-type cbc struct {
-	b         Block
-	blockSize int
-	iv        []byte
-	tmp       []byte
-}
-
-func newCBC(b Block, iv []byte) *cbc {
-	return &cbc{
-		b:         b,
-		blockSize: b.BlockSize(),
-		iv:        dup(iv),
-		tmp:       make([]byte, b.BlockSize()),
-	}
-}
-
-type cbcEncrypter cbc
-
-// NewCBCEncrypter returns a BlockMode which encrypts in cipher block chaining
-// mode, using the given Block. The length of iv must be the same as the
-// Block's block size.
-func NewCBCEncrypter(b Block, iv []byte) BlockMode {
-	if len(iv) != b.BlockSize() {
-		panic("cipher.NewCBCEncrypter: IV length must equal block size")
-	}
-	return (*cbcEncrypter)(newCBC(b, iv))
-}
-
-func (x *cbcEncrypter) BlockSize() int { return x.blockSize }
-
-func (x *cbcEncrypter) CryptBlocks(dst, src []byte) {
-	if len(src)%x.blockSize != 0 {
-		panic("crypto/cipher: input not full blocks")
-	}
-	if len(dst) < len(src) {
-		panic("crypto/cipher: output smaller than input")
-	}
-
-	iv := x.iv
-
-	for len(src) > 0 {
-		// Write the xor to dst, then encrypt in place.
-		xorBytes(dst[:x.blockSize], src[:x.blockSize], iv)
-		x.b.Encrypt(dst[:x.blockSize], dst[:x.blockSize])
-
-		// Move to the next block with this block as the next iv.
-		iv = dst[:x.blockSize]
-		src = src[x.blockSize:]
-		dst = dst[x.blockSize:]
-	}
-
-	// Save the iv for the next CryptBlocks call.
-	copy(x.iv, iv)
-}
-
-func (x *cbcEncrypter) SetIV(iv []byte) {
-	if len(iv) != len(x.iv) {
-		panic("cipher: incorrect length IV")
-	}
-	copy(x.iv, iv)
-}
-
-type cbcDecrypter cbc
-
-// NewCBCDecrypter returns a BlockMode which decrypts in cipher block chaining
-// mode, using the given Block. The length of iv must be the same as the
-// Block's block size and must match the iv used to encrypt the data.
-func NewCBCDecrypter(b Block, iv []byte) BlockMode {
-	if len(iv) != b.BlockSize() {
-		panic("cipher.NewCBCDecrypter: IV length must equal block size")
-	}
-	return (*cbcDecrypter)(newCBC(b, iv))
-}
-
-func (x *cbcDecrypter) BlockSize() int { return x.blockSize }
-
-func (x *cbcDecrypter) CryptBlocks(dst, src []byte) {
-	if len(src)%x.blockSize != 0 {
-		panic("crypto/cipher: input not full blocks")
-	}
-	if len(dst) < len(src) {
-		panic("crypto/cipher: output smaller than input")
-	}
-	if len(src) == 0 {
-		return
-	}
-
-	// For each block, we need to xor the decrypted data with the previous block's ciphertext (the iv).
-	// To avoid making a copy each time, we loop over the blocks BACKWARDS.
-	end := len(src)
-	start := end - x.blockSize
-	prev := start - x.blockSize
-
-	// Copy the last block of ciphertext in preparation as the new iv.
-	copy(x.tmp, src[start:end])
-
-	// Loop over all but the first block.
-	for start > 0 {
-		x.b.Decrypt(dst[start:end], src[start:end])
-		xorBytes(dst[start:end], dst[start:end], src[prev:start])
-
-		end = start
-		start = prev
-		prev -= x.blockSize
-	}
-
-	// The first block is special because it uses the saved iv.
-	x.b.Decrypt(dst[start:end], src[start:end])
-	xorBytes(dst[start:end], dst[start:end], x.iv)
-
-	// Set the new iv to the first block we copied earlier.
-	x.iv, x.tmp = x.tmp, x.iv
-}
-
-func (x *cbcDecrypter) SetIV(iv []byte) {
-	if len(iv) != len(x.iv) {
-		panic("cipher: incorrect length IV")
-	}
-	copy(x.iv, iv)
-}