如何解码PEM编码的PKIX公钥？

Question

The example given in Go's official documentation for x509.ParsePKIXPublicKey encounters a runtime error because the Block that pem.Decode() returns is nil . ( Playground example )

However, the example in the official documentation for pem.Decode() runs just fine. ( Playground example )

The only difference I've spotted between the two examples is the the way the public key is initialized and they way it is used in pem.Decode() .

First example:

const pubPEM = `
    -----BEGIN PUBLIC KEY-----
    ...
    -----END PUBLIC KEY-----`
block, _ := pem.Decode([]byte(pubPEM))

Second example:

var pubPEMData = []byte(`
    -----BEGIN PUBLIC KEY-----
    ...
    -----END PUBLIC KEY-----`)
block, rest := pem.Decode(pubPEMData)

I've edited the first example so that it is done in the same way as the second, but this did not change the outcome. ( Playground example )

What is causing the first to fail but not the second?

Answer 1

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