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GO NewOFB用法及代碼示例

GO語言"crypto/cipher"包中"NewOFB"函數的用法及代碼示例。

用法:

func NewOFB(b Block, iv []byte) Stream

NewOFB 返回一個 Stream,該 Stream 在輸出反饋模式下使用分組密碼 b 進行加密或解密。初始化向量 iv 的長度必須等於 b 的塊大小。

例子:

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "crypto/rand"
    "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")
    plaintext := []byte("some plaintext")

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

    // The IV needs to be unique, but not secure. Therefore it's common to
    // include it at the beginning of the ciphertext.
    ciphertext := make([]byte, aes.BlockSize+len(plaintext))
    iv := ciphertext[:aes.BlockSize]
    if _, err := io.ReadFull(rand.Reader, iv); err != nil {
        panic(err)
    }

    stream := cipher.NewOFB(block, iv)
    stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)

    // It's important to remember that ciphertexts must be authenticated
    // (i.e. by using crypto/hmac) as well as being encrypted in order to
    // be secure.

    // OFB mode is the same for both encryption and decryption, so we can
    // also decrypt that ciphertext with NewOFB.

    plaintext2 := make([]byte, len(plaintext))
    stream = cipher.NewOFB(block, iv)
    stream.XORKeyStream(plaintext2, ciphertext[aes.BlockSize:])

    fmt.Printf("%s\n", plaintext2)
}

輸出:

some plaintext

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注:本文由純淨天空篩選整理自golang.google.cn大神的英文原創作品 NewOFB。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。