Question

我将公钥存储在interface {}

类型的变量中

无论如何我可以在golang中将其转换为* rsa.PublicKey类型。它可能涉及一些中间步骤，如首先将interface {}转换为string。

Answer 1

通常，您将使用crypto/x509库解码pem文件（假设这是在x509中）。文档中提供的example如下：

package main

import (
    "crypto/dsa"
    "crypto/ecdsa"
    "crypto/rsa"
    "crypto/x509"
    "encoding/pem"
    "fmt"
)

func main() {
    const pubPEM = `
-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----`

    block, _ := pem.Decode([]byte(pubPEM))
    if block == nil {
        panic("failed to parse PEM block containing the public key")
    }

    pub, err := x509.ParsePKIXPublicKey(block.Bytes)
    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 of public key")
    }
}

我不太确定你在那里的编码。以下内容可能会帮助您克服这个障碍：

RSA Public Key format

Answer 2

你可以使用： rsaPublickey, _ := pub.(*rsa.PublicKey) 转换为rsa.PublicKey

如何将接口{}转换为类型* rsa.PublicKey golang

2 个答案: