diff options
Diffstat (limited to 'gcc-4.8.1/libgo/go/crypto/cipher/cbc.go')
-rw-r--r-- | gcc-4.8.1/libgo/go/crypto/cipher/cbc.go | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/gcc-4.8.1/libgo/go/crypto/cipher/cbc.go b/gcc-4.8.1/libgo/go/crypto/cipher/cbc.go deleted file mode 100644 index 6fab9b421..000000000 --- a/gcc-4.8.1/libgo/go/crypto/cipher/cbc.go +++ /dev/null @@ -1,84 +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) { - for len(src) > 0 { - for i := 0; i < x.blockSize; i++ { - x.iv[i] ^= src[i] - } - x.b.Encrypt(x.iv, x.iv) - for i := 0; i < x.blockSize; i++ { - dst[i] = x.iv[i] - } - src = src[x.blockSize:] - dst = dst[x.blockSize:] - } -} - -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) { - for len(src) > 0 { - x.b.Decrypt(x.tmp, src[:x.blockSize]) - for i := 0; i < x.blockSize; i++ { - x.tmp[i] ^= x.iv[i] - x.iv[i] = src[i] - dst[i] = x.tmp[i] - } - - src = src[x.blockSize:] - dst = dst[x.blockSize:] - } -} |