在Golang中从模数和指数创建公钥

Question

我从第一个证书中获取:https://www.googleapis.com/oauth2/v2/certs'n '和'e'键值.Go中是否有可以使用'n'和'e'构建公钥的包？我不知道如何使用crypto/rsa包完成它.有些代码很珍贵.谢谢.

Answer 1

rsa包的PublicKey类型包含字段N和E.按照JWA草案中的描述解码部件应该非常简单.

这是一些快速入侵的代码(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)}
}