dtj2ww9500 2019-05-10 09:09
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如何在Go中从x509证书公钥中获取字符串?

If I have an *x509.Certificate object, how can I extract the public key base64 string representation out of it?

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  • dongzhuo8210 2019-05-10 10:13
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    NOTE: Jump to #3 if you already have the x509.Certificate object.


    You would need to do the following:

    1. Decode the PEM with pem.Decode().
    block, _ := pem.Decode([]byte(certPEM))
    
    1. Parse the certificate with x509.ParseCertificate().
    cert, _ := x509.ParseCertificate(block.Bytes)
    
    1. Marshal the Public key with x509.MarshalPKIXPublicKey().
    publicKeyDer, _ := x509.MarshalPKIXPublicKey(cert.PublicKey)
    
    1. 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!

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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