Load public key from DER encoded certificate

[0x7bc77a]

Hi,

I would like to load the public key from a DER encoded certificate

Here is my code

func ExampleParsePKIXPublicKey() {

raw, err := ioutil.ReadFile("/Path/To/DER/Encoded/Certificate")

if err != nil {

panic("failed to read certificate" + err.Error())

}

pub, err := x509.ParsePKIXPublicKey(raw)

if err != nil {

panic("failed to parse DER encoded public key: " + err.Error())

}

switch pub := pub.(type) {

case *rsa.PublicKey:

fmt.Println("Pub is of type RSA:", pub)

case *dsa.PublicKey:

fmt.Println("Pub is of type DSA:", pub)

case *ecdsa.PublicKey:

fmt.Println("Pub is of type ECDSA:", pub)

default:

panic("unknown type fo public key")

}

}

then I get errors like below:

panic: failed to parse DER encoded public key: asn1: structure error: tags don't match (6 vs {class:2 tag:0 length:3 isCompound:true}) {optional:false explicit:false application:f

alse defaultValue:<nil> tag:<nil> stringType:0 timeType:0 set:false omitEmpty:false} ObjectIdentifier @2

any ideas to solve this problem?

thanks in advance!

[Janne Snabb]

You are trying to read a certificate with a function intended for
reading a public key.

Use x509.ParseCertificates instead.


Janne Snabb
sn...@epipe.com

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[Simon Ritchie]

I've just put onto github a working example of an application that loads and uses a digital certificate.  It's not DER, but the code is probably a good guide as to what you need to do:  https://github.com/goblimey/grpc

I hope this helps.

Simon