如何在Go中验证RSA密钥长度？

import (
    "crypto/rsa"
    "crypto/x509"
    "encoding/pem"
    "fmt"
)

func validateRSALength(keyBytes []byte) error {
    block, _ := pem.Decode(keyBytes)
    if block == nil {
        return fmt.Errorf("failed to decode PEM block")
    }

    key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
    if err != nil {
        return fmt.Errorf("failed to parse private key: %v", err)
    }

    if key.Size()*8 < 2048 {
        return fmt.Errorf("RSA key length is less than 2048 bits")
    }

    return nil
}

keyBytes := []byte("your RSA key bytes here")

err := validateRSALength(keyBytes)
if err != nil {
    fmt.Println(err)
} else {
    fmt.Println("RSA key length is valid")
}