用goland写一个用给定字符串公钥进行rsa加密的代码

好的，我明白了。以下是示例代码：

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"errors"
	"fmt"
	"io/ioutil"
)

func main() {
	// Load public key from file, assuming it's in PEM format
	pubBytes, err := ioutil.ReadFile("public.pem")
	if err != nil {
		fmt.Println("Error reading public key file:", err)
		return
	}

	// Parse PEM-encoded public key
	pubBlock, _ := pem.Decode(pubBytes)
	if pubBlock == nil {
		fmt.Println("Error decoding public key")
		return
	}

	pubKey, err := x509.ParsePKCS1PublicKey(pubBlock.Bytes)
	if err != nil {
		fmt.Println("Error parsing public key:", err)
		return
	}

	// Generate plaintext to encrypt
	plaintext := []byte("Hello, world!")

	// Encrypt plaintext using public key
	ciphertext, err := rsa.EncryptPKCS1v15(rand.Reader, pubKey, plaintext)
	if err != nil {
		fmt.Println("Error encrypting plaintext:", err)
		return
	}

	fmt.Printf("Ciphertext: %x\n", ciphertext)
}

请将上面代码中的 `public.pem` 替换为你实际使用的公钥文件名，plaintext 替换为你要加密的数据。