保存并从磁盘加载crypto / rsa PrivateKey

时间:2012-11-25 20:20:04

标签: go cryptography rsa

我正在使用crypto/rsa,并尝试找到正确保存和加载密钥的方法。是否有正确的方法可以从[]byte创建rsa.PrivateKey。如果是这样,有没有办法为rsa.PublicKey正确执行此操作?

非常感谢你。

4 个答案:

答案 0 :(得分:58)

您需要某种格式来将密钥编组。可以在此处找到Go标准库支持的一种格式:http://golang.org/pkg/crypto/x509/#MarshalPKCS1PrivateKey

func MarshalPKCS1PrivateKey(key *rsa.PrivateKey) []byte

反函数是http://golang.org/pkg/crypto/x509/#ParsePKCS1PrivateKey

func ParsePKCS1PrivateKey(der []byte) (key *rsa.PrivateKey, err error)

但是,将编组密钥编码为PEM文件是相对标准的。

pemdata := pem.EncodeToMemory(
    &pem.Block{
        Type: "RSA PRIVATE KEY",
        Bytes: x509.MarshalPKCS1PrivateKey(key),
    },
)

您可以找到完整的示例here

答案 1 :(得分:23)

由于你问题的公钥部分没有得到解答,我遇到了同样的问题并解决了它,这里是:

请注意参数前面的&MarshalPKIXPublicKey

Priv := rsa.GenerateKey(rand.Reader, 4096)

PubASN1, err := x509.MarshalPKIXPublicKey(&Priv.PublicKey)
if err != nil {
    // do something about it
}

pubBytes = pem.EncodeToMemory(&pem.Block{
    Type:  "RSA PUBLIC KEY",
    Bytes: PubASN1,
})

ioutil.WriteFile("key.pub", PubBytes, 0644)

相关读物:

  • MarshalPKIXPublicKey(pub interface {})([] byte,error)godoc
  • EncodeToMemory(b * Block)[] byte godoc
  • 阻止godoc

PS:MarshalPKIXPublicKey也接受ECDSA密钥,适当调整pem头。

答案 2 :(得分:23)

此处的代码段显示了公钥和私钥的导入和导出。它基于其他非常有用的答案,以及来自官方文档的复制意大利面。

package main

import (
    "crypto/rand"
    "crypto/rsa"
    "crypto/x509"
    "encoding/pem"
    "errors"
    "fmt"
)

func GenerateRsaKeyPair() (*rsa.PrivateKey, *rsa.PublicKey) {
    privkey, _ := rsa.GenerateKey(rand.Reader, 4096)
    return privkey, &privkey.PublicKey
}

func ExportRsaPrivateKeyAsPemStr(privkey *rsa.PrivateKey) string {
    privkey_bytes := x509.MarshalPKCS1PrivateKey(privkey)
    privkey_pem := pem.EncodeToMemory(
            &pem.Block{
                    Type:  "RSA PRIVATE KEY",
                    Bytes: privkey_bytes,
            },
    )
    return string(privkey_pem)
}

func ParseRsaPrivateKeyFromPemStr(privPEM string) (*rsa.PrivateKey, error) {
    block, _ := pem.Decode([]byte(privPEM))
    if block == nil {
            return nil, errors.New("failed to parse PEM block containing the key")
    }

    priv, err := x509.ParsePKCS1PrivateKey(block.Bytes)
    if err != nil {
            return nil, err
    }

    return priv, nil
}

func ExportRsaPublicKeyAsPemStr(pubkey *rsa.PublicKey) (string, error) {
    pubkey_bytes, err := x509.MarshalPKIXPublicKey(pubkey)
    if err != nil {
            return "", err
    }
    pubkey_pem := pem.EncodeToMemory(
            &pem.Block{
                    Type:  "RSA PUBLIC KEY",
                    Bytes: pubkey_bytes,
            },
    )

    return string(pubkey_pem), nil
}

func ParseRsaPublicKeyFromPemStr(pubPEM string) (*rsa.PublicKey, error) {
    block, _ := pem.Decode([]byte(pubPEM))
    if block == nil {
            return nil, errors.New("failed to parse PEM block containing the key")
    }

    pub, err := x509.ParsePKIXPublicKey(block.Bytes)
    if err != nil {
            return nil, err
    }

    switch pub := pub.(type) {
    case *rsa.PublicKey:
            return pub, nil
    default:
            break // fall through
    }
    return nil, errors.New("Key type is not RSA")
}

func main() {

    // Create the keys
    priv, pub := GenerateRsaKeyPair()

    // Export the keys to pem string
    priv_pem := ExportRsaPrivateKeyAsPemStr(priv)
    pub_pem, _ := ExportRsaPublicKeyAsPemStr(pub)

    // Import the keys from pem string
    priv_parsed, _ := ParseRsaPrivateKeyFromPemStr(priv_pem)
    pub_parsed, _ := ParseRsaPublicKeyFromPemStr(pub_pem)

    // Export the newly imported keys
    priv_parsed_pem := ExportRsaPrivateKeyAsPemStr(priv_parsed)
    pub_parsed_pem, _ := ExportRsaPublicKeyAsPemStr(pub_parsed)

    fmt.Println(priv_parsed_pem)
    fmt.Println(pub_parsed_pem)

    // Check that the exported/imported keys match the original keys
    if priv_pem != priv_parsed_pem || pub_pem != pub_parsed_pem {
            fmt.Println("Failure: Export and Import did not result in same Keys")
    } else {
            fmt.Println("Success")
    }
}

答案 3 :(得分:0)

仅供参考:我整理了@David W的答案,并将其放在一个很小的Go Module中。 https://github.com/rokk4/gorsapemhelpers