如何在Go中从x509证书公钥中获取字符串？
问题描述：
If I have an *x509.Certificate object, how can I extract the public key base64 string representation out of it?
如果我有一个 * x509.Certificate code>对象，如何提取公钥 base64字符串表示出来了吗？ p>
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答
NOTE: Jump to #3 if you already have the x509.Certificate object.
You would need to do the following:
- Decode the PEM with
pem.Decode().
block, _ := pem.Decode([]byte(certPEM))
- Parse the certificate with
x509.ParseCertificate().
cert, _ := x509.ParseCertificate(block.Bytes)
- Marshal the Public key with
x509.MarshalPKIXPublicKey().
publicKeyDer, _ := x509.MarshalPKIXPublicKey(cert.PublicKey)
- Encode it in a PEM encoded structure with
pem.EncodeToMemory().
publicKeyBlock := pem.Block{
Type: "PUBLIC KEY",
Bytes: publicKeyDer,
}
publicKeyPem := string(pem.EncodeToMemory(&publicKeyBlock))
Run it on Go Playground
You can confirm the result if you copy the certificate in the example to a file cert.pem with the command:
openssl x509 -inform pem -in cert.pem -pubkey -noout
You should get the same result!