Go语言中MD5基块密码的实现与替代方案

package main

import (
    "crypto/md5"
    "encoding/hex"
    "fmt"
)

func generateMD5Hash(data string) string {
    hasher := md5.New()
    hasher.Write([]byte(data))
    return hex.EncodeToString(hasher.Sum(nil))
}

func main() {
    input := "Hello, Go and MD5!"
    hash := generateMD5Hash(input)
    fmt.Printf("MD5 Hash of \"%s\": %s\n", input, hash)
}

package main

import (
    "crypto/aes"
    "crypto/cipher"
    "crypto/rand"
    "fmt"
    "io"
)

// EncryptAESGCM 使用AES-256-GCM加密数据
func EncryptAESGCM(plaintext []byte, key []byte) ([]byte, error) {
    block, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }

    gcm, err := cipher.NewGCM(block)
    if err != nil {
        return nil, err
    }

    nonce := make([]byte, gcm.NonceSize())
    if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
        return nil, err
    }

    // 加密并附加认证标签
    ciphertext := gcm.Seal(nonce, nonce, plaintext, nil)
    return ciphertext, nil
}

// DecryptAESGCM 使用AES-256-GCM解密数据
func DecryptAESGCM(ciphertext []byte, key []byte) ([]byte, error) {
    block, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }

    gcm, err := cipher.NewGCM(block)
    if err != nil {
        return nil, err
    }

    nonceSize := gcm.NonceSize()
    if len(ciphertext) < nonceSize {
        return nil, fmt.Errorf("密文过短")
    }

    nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
    plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
    if err != nil {
        return nil, err
    }
    return plaintext, nil
}

func main() {
    // 示例密钥 (应安全生成和管理)
    key := make([]byte, 32) // AES-256 需要32字节密钥
    if _, err := io.ReadFull(rand.Reader, key); err != nil {
        panic(err)
    }

    originalText := []byte("这是一段需要加密的私有数据。")
    fmt.Printf("原始数据: %s\n", originalText)

    encryptedData, err := EncryptAESGCM(originalText, key)
    if err != nil {
        fmt.Println("加密失败:", err)
        return
    }
    fmt.Printf("加密数据 (Base64编码): %x\n", encryptedData)

    decryptedData, err := DecryptAESGCM(encryptedData, key)
    if err != nil {
        fmt.Println("解密失败:", err)
        return
    }
    fmt.Printf("解密数据: %s\n", decryptedData)
}