I fetched from the first certificate on: https://www.googleapis.com/oauth2/v2/certs the 'n' and 'e' key values. Is there a package in Go that can build a public key with 'n' and 'e'? I don't know how it's done using the crypto/rsa package. Some code would be precious. Thank You.
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- douzai1074 2014-08-07 11:39关注
The rsa package has a
PublicKey
type with fieldsN
andE
. It should be pretty straightforward to decode the parts as described in the JWA draft.Here is some quickly hacked code (Playground):
package main import ( "bytes" "crypto/rsa" "encoding/base64" "encoding/binary" "fmt" "math/big" ) func main() { nStr := "AN+7p8kw1A3LXfAJi+Ui4o8F8G0EeB4B5RuufglWa4AkadDaLTxGLNtY/NtyRZBfwhdAmRjKQJTVgn5j3y0s+j/bvpzMktoVeHB7irOhxDnZJdIxNNMY3nUKBgQB81jg8lNTeBrJqELSJiRXQIe5PyWJWwQJ1XrtfQNcwGkICM1L" decN, err := base64.StdEncoding.DecodeString(nStr) if err != nil { fmt.Println(err) return } n := big.NewInt(0) n.SetBytes(decN) eStr := "AQAB" decE, err := base64.StdEncoding.DecodeString(eStr) if err != nil { fmt.Println(err) return } var eBytes []byte if len(decE) < 8 { eBytes = make([]byte, 8-len(decE), 8) eBytes = append(eBytes, decE...) } else { eBytes = decE } eReader := bytes.NewReader(eBytes) var e uint64 err = binary.Read(eReader, binary.BigEndian, &e) if err != nil { fmt.Println(err) return } pKey := rsa.PublicKey{N: n, E: int(e)} }
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