GO-如何将公钥从字符串转换为PEM格式

问题描述：

I am trying to use jwt library to do jwt validation. And i am getting public key from another application by calling its REST endpoint which is returning public key in string format.

So now when trying to send that public key in same string format, i am getting "Invalid key format". Any help on how to convert string formatted key to a valid PEM format would be great.

func (test *TESTStrategy) doJWTValidation(token string, key string, logger *util.Logger) (TESTResponse, error) {
    parsedToken, jwtErr := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
        return decodedJWT.ParsedPubKey, nil
    })

Below is the error what i am getting when passing key as a string to jwt.Pasrse() call.

Public Key: MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsFWkb/eSl6I3DRVhaonW3DFy8EnL0yaPiDzCcOLuYfBjN9zZIR1wXmnMJFle1K89qHGg42wgweVTIwA1XFTfoUKSziwsjF6FscZX5H56ZYyS/wWiO3rWWynlfbSZt+ga71+ndsu+A0Dy7Nn7ZgP8kRsu4UM5vE7QQTRERNiUKpzScN1cgZUFUqSddQmkwTEN8hH1mFX1Mum54NGqWIlmQxQDrOyogmMXIaaakhabcmuIPMULVVDVwUJC9sSDsc/j05qcZn3kkiEBRyiYB6ZLY2W7WfiV+dB7/icPONsYSD0FxHWEGNnbqtiGoNf9WZWtaP+o8WMR9sB3GKGVnbLvbQIDAQAB

我正在尝试使用jwt库进行jwt验证。我通过调用其REST端点从另一个应用程序获取公钥，该REST端点以字符串格式返回公钥。 p>

因此，现在当尝试以相同的字符串格式发送该公共密钥时，我会收到“无效的密钥格式”。如何将字符串格式的密钥转换为有效的PEM格式的任何帮助都将非常有用。 p>

  func（测试* TESTStrategy）doJWTValidation（令牌字符串，键字符串，记录器* util.Logger）（TESTResponse，错误）{
 parsedToken，jwtErr：= jwt.Parse  （令牌，func（令牌* jwt.Token）（接口{}，错误）{
返回decodedJWT.ParsedPubKey，nil 
}）
  code>  pre> 
 
 下面是 将键作为字符串传递给jwt.Pasrse（）调用时出现的错误。   p> 
 
 
    p> 
 
 
公钥：
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsFWkb / eSl6I3DRVhaonW3DFy8EnL0yaPiDzCcOLuYfBjN9zZIR1wXmnMJFle1K89qHGg42wgweVTIwA1XFTfoUKSziwsjF6FscZX5H56ZYyS / wWiO3rWWynlfbSZt + ga71 + NDSU + A0Dy7Nn7ZgP8kRsu4UM5vE7QQTRERNiUKpzScN1cgZUFUqSddQmkwTEN8hH1mFX1Mum54NGqWIlmQxQDrOyogmMXIaaakhabcmuIPMULVVDVwUJC9sSDsc /  j05qcZn3kkiEBRyiYB6ZLY2W7WfiV + dB7 / icPONsYSD0FxHWEGNnbqtiGoNf9WZWtaP + o8WMR9sB3GKGVnbLvbQIDAQAB  p> 
  div>

答

That's a PEM encoded key, it's just missing the BEGIN & END headers. The key is simple Base64 encoded, you can decode and unmarshal into a RSA key as follows:

base64Data := []byte(`MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsFWkb/eSl6I3DRVhaonW3DFy8EnL0yaPiDzCcOLuYfBjN9zZIR1wXmnMJFle1K89qHGg42wgweVTIwA1XFTfoUKSziwsjF6FscZX5H56ZYyS/wWiO3rWWynlfbSZt+ga71+ndsu+A0Dy7Nn7ZgP8kRsu4UM5vE7QQTRERNiUKpzScN1cgZUFUqSddQmkwTEN8hH1mFX1Mum54NGqWIlmQxQDrOyogmMXIaaakhabcmuIPMULVVDVwUJC9sSDsc/j05qcZn3kkiEBRyiYB6ZLY2W7WfiV+dB7/icPONsYSD0FxHWEGNnbqtiGoNf9WZWtaP+o8WMR9sB3GKGVnbLvbQIDAQAB`)
d := make([]byte, base64.StdEncoding.DecodedLen(len(base64Data)))
n, err := base64.StdEncoding.Decode(d, base64Data)
if err != nil {
    // Handle error
}
d = d[:n]
key,err:=x509.ParsePKIXPublicKey(d)
if err != nil {
    // Handle error
}
fmt.Println(key)

If you need the key in PEM encoded form, simple add the appropriate header and footer, e.g. -----BEGIN PUBLIC KEY----- & -----END PUBLIC KEY-----. Note that the BEGIN header must start on its own line and end in a new line (" "). The END header must also be proceeded by a new line.

GO-如何将公钥从字符串转换为PEM格式

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