GO StreamWriter用法及代码示例

GO语言"crypto/cipher"包中"StreamWriter"类型的用法及代码示例。

StreamWriter 将 Stream 包装到 io.Writer 中。它调用 XORKeyStream 来处理通过的每个数据片。如果任何 Write 调用返回短，则 StreamWriter 不同步，必须丢弃。 StreamWriter 没有内部缓冲；不需要调用 Close 来刷新写入数据。

用法:

type StreamWriter struct {
    S   Stream
    W   io.Writer
    Err error // unused
}

例子：

package main

import (
	"bytes"
	"crypto/aes"
	"crypto/cipher"
	"encoding/hex"
	"fmt"
	"io"
)

func main() {
	// Load your secret key from a safe place and reuse it across multiple
	// NewCipher calls. (Obviously don't use this example key for anything
	// real.) If you want to convert a passphrase to a key, use a suitable
	// package like bcrypt or scrypt.
	key, _ := hex.DecodeString("6368616e676520746869732070617373")

	bReader := bytes.NewReader([]byte("some secret text"))

	block, err := aes.NewCipher(key)
	if err != nil {
		panic(err)
	}

	// If the key is unique for each ciphertext, then it's ok to use a zero
	// IV.
	var iv [aes.BlockSize]byte
	stream := cipher.NewOFB(block, iv[:])

	var out bytes.Buffer

	writer := &cipher.StreamWriter{S: stream, W: &out}
	// Copy the input to the output buffer, encrypting as we go.
	if _, err := io.Copy(writer, bReader); err != nil {
		panic(err)
	}

	// Note that this example is simplistic in that it omits any
	// authentication of the encrypted data. If you were actually to use
	// StreamReader in this manner, an attacker could flip arbitrary bits in
	// the decrypted result.

	fmt.Printf("%x\n", out.Bytes())
}

输出：

cf0495cc6f75dafc23948538e79904a9

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注：本文由纯净天空筛选整理自golang.google.cn大神的英文原创作品 StreamWriter。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。