如何在go中从jwk生成pem

import (
    "encoding/pem"
    "encoding/base64"
    "crypto/x509"
    "crypto/rsa"
    "crypto/ecdsa"
    "crypto/elliptic"
    "github.com/lestrrat-go/jwx/jwk"
)

jwkData := []byte(`{
    "kty": "RSA",
    "n": "n_value",
    "e": "e_value",
    "d": "d_value",
    "p": "p_value",
    "q": "q_value",
    "dp": "dp_value",
    "dq": "dq_value",
    "qi": "qi_value"
}`)

key, err := jwk.ParseKey(jwkData)
if err != nil {
    // 处理解析错误
}

var pemData []byte

switch key.Algorithm() {
case "RSA":
    rsaKey := key.(*rsa.PrivateKey)
    derBytes := x509.MarshalPKCS1PrivateKey(rsaKey)
    pemData = pem.EncodeToMemory(&pem.Block{
        Type:  "RSA PRIVATE KEY",
        Bytes: derBytes,
    })
case "EC":
    ecdsaKey := key.(*ecdsa.PrivateKey)
    derBytes, err := x509.MarshalECPrivateKey(ecdsaKey)
    if err != nil {
        // 处理编码错误
    }
    pemData = pem.EncodeToMemory(&pem.Block{
        Type:  "EC PRIVATE KEY",
        Bytes: derBytes,
    })
default:
    // 处理不支持的密钥类型错误
}

// 可以将pemData保存到文件中，或者直接使用它进行后续操作