Golang implements pyffx

Golang is a fast, efficient, cross-platform programming language that is increasingly favored by developers. Pyffx is a convenient and customizable encryption algorithm library, mainly used to encrypt and decrypt strings. This article will introduce how to implement pyffx using Golang.

1. What is pyffx?

pyffx is an encryption algorithm library implemented in Python, which can encrypt and decrypt strings. The pyffx algorithm uses the Feistel cryptosystem, which is a block cipher. It divides the plaintext into two halves and performs multiple iterations respectively to finally obtain the ciphertext. The characteristic of the pyffx algorithm is that it can perform reversible encryption and irreversible encryption.

2. Golang implements pyffx

In Golang, we can implement the pyffx algorithm by using the following library:

1. crypto/sha1: SHA-1 is a An encryption algorithm that can be used to generate hash values.
2. crypto/aes: AES is a symmetric encryption algorithm that can encrypt plaintext into ciphertext and decrypt ciphertext into plaintext.
3. strconv: strconv is a library for string conversion, which can convert numeric values ​​to strings and strings to numeric values.

4. Sample code

The following is a sample code that uses Golang to implement the pyffx algorithm.

package main

import (
    "bytes"
    "crypto/aes"
    "crypto/cipher"
    "crypto/rand"
    "crypto/sha1"
    "fmt"
    "strconv"
)

const (
    blocksize = 8
)

var (
    seed = []byte("0123456789abcdef")
)

func main() {
    key := []byte("this is a secret key")
    text := []byte("hello world")

    // 初始化
    parameters, err := cipherSuite(key)
    if err != nil {
        panic(err)
    }

    // 加密
    ciphertext := encrypt(text, parameters)
    fmt.Println("ciphertext:", ciphertext)

    // 解密
    plaintext := decrypt(ciphertext, parameters)
    fmt.Println("plaintext:", plaintext)
}

func cipherSuite(key []byte) (cipher.Block, error) {
    // 计算密钥的散列值
    keyDigest := sha1.Sum(key)

    // 生成参数
    params := make([]byte, 20)
    copy(params, keyDigest[:])

    // 生成加密器
    block, err := aes.NewCipher(params)
    if err != nil {
        return nil, err
    }

    return block, nil
}

func encrypt(plaintext []byte, parameters cipher.Block) []byte {
    // 对明文进行补位操作
    padLength := blocksize - len(plaintext)%blocksize
    padded := append(plaintext, bytes.Repeat([]byte{byte(padLength)}, padLength)...)

    // 对补位后的明文进行加密
    ciphertext := make([]byte, len(padded))
    for i := 0; i < len(padded); i += blocksize {
        parameters.Encrypt(ciphertext[i:i+blocksize], padded[i:i+blocksize])
    }

    // 对密文进行编码
    encoded := make([]byte, hex.EncodedLen(len(ciphertext)))
    hex.Encode(encoded, ciphertext)

    return encoded
}

func decrypt(encoded []byte, parameters cipher.Block) []byte {
    // 对密文进行解码
    decoded := make([]byte, hex.DecodedLen(len(encoded)))
    _, err := hex.Decode(decoded, encoded)
    if err != nil {
        panic(err)
    }

    // 对解码后的密文进行解密
    padded := make([]byte, len(decoded))
    for i := 0; i < len(decoded); i += blocksize {
        parameters.Decrypt(padded[i:i+blocksize], decoded[i:i+blocksize])
    }

    // 对解密后的明文进行去位操作
    padLength := int(padded[len(padded)-1])
    plaintext := padded[:len(padded)-padLength]

    return plaintext
}

func randInt(seed []byte, i int) int {
    r, _ := strconv.Atoi(randString(seed, i))
    return r
}

func randString(seed []byte, i int) string {
    var pt string
    for x := range seed {
        pt += strconv.Itoa(int(seed[x]))
    }
    res := ""
    for x := range pt {
        var n int
        if x+i >= len(pt) {
            n = int(pt[x])
        } else {
            n = int(pt[x+i])
        }
        res += strconv.Itoa(n%10 + randInt(seed, i+1))
    }
    return res
}

5. Summary

This article introduces how to use Golang to implement the pyffx algorithm. Through the above example code, we can find that Golang implements the pyffx algorithm is very simple, and only needs to use crypto/sha1, Common libraries such as crypto/aes and strconv.

Of course, this article provides a simple implementation. If you want to use it in actual production, you need to conduct more complete testing and verification to ensure safety and reliability.

The above is the detailed content of Golang implements pyffx. For more information, please follow other related articles on the PHP Chinese website!