golang实现pyffx

package mainimport (    "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}