bae90c989c
This revision was committed January 7, 2014. The next revision deleted runtime/mfinal.c. That will be done in a subsequent merge. This merge changes type descriptors to add a zero field, pointing to a zero value for that type. This is implemented as a common variable. * go-gcc.cc (Gcc_backend::implicit_variable): Add is_common and alignment parameters. Permit init parameter to be NULL. From-SVN: r211249
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package cipher implements standard block cipher modes that can be wrapped
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// around low-level block cipher implementations.
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// See http://csrc.nist.gov/groups/ST/toolkit/BCM/current_modes.html
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// and NIST Special Publication 800-38A.
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package cipher
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// A Block represents an implementation of block cipher
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// using a given key. It provides the capability to encrypt
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// or decrypt individual blocks. The mode implementations
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// extend that capability to streams of blocks.
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type Block interface {
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// BlockSize returns the cipher's block size.
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BlockSize() int
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// Encrypt encrypts the first block in src into dst.
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// Dst and src may point at the same memory.
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Encrypt(dst, src []byte)
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// Decrypt decrypts the first block in src into dst.
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// Dst and src may point at the same memory.
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Decrypt(dst, src []byte)
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}
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// A Stream represents a stream cipher.
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type Stream interface {
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// XORKeyStream XORs each byte in the given slice with a byte from the
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// cipher's key stream. Dst and src may point to the same memory.
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XORKeyStream(dst, src []byte)
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}
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// A BlockMode represents a block cipher running in a block-based mode (CBC,
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// ECB etc).
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type BlockMode interface {
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// BlockSize returns the mode's block size.
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BlockSize() int
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// CryptBlocks encrypts or decrypts a number of blocks. The length of
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// src must be a multiple of the block size. Dst and src may point to
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// the same memory.
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CryptBlocks(dst, src []byte)
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}
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// Utility routines
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func dup(p []byte) []byte {
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q := make([]byte, len(p))
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copy(q, p)
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return q
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}
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