How to write *PrivateKey type variable to a file in golang?

huangapple
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英文:

How to write *PrivateKey type variable to a file in golang?

问题

我已经使用go语言的crypto/rsa库生成了一个RSA私钥和相应的公钥。现在我想将它们分别写入两个文件中，但是WriteString和Write函数只适用于字符串和字节切片变量。而且像String(privateKey)这样的指令会生成错误。我该如何将这些密钥写入文件中呢？

英文:

I have generated a RSA private key (using crypto/rsa) and corresponding public key in go. Now I want to write them to two files (each one to a file), but WriteString and Write functions are specific to string and []byte variable. Also instructions like String(privateKey) generate error. How I can write these keys to the files?

答案1

得分: 1

你需要使用pem.Encode函数进行编码。在maplepie/rsa#savePrivateKey()中可以看到一个示例：

  1. func (p *PemKey) savePrivateKey(privateKey *rsa.PrivateKey, filename string) error {
  2.     raw := x509.MarshalPKCS1PrivateKey(privateKey)
  3.     block := &pem.Block{
  4.         Type:  "RSA PRIVATE KEY",
  5.         Bytes: raw,
  6.     }
  7.     file, err := os.Create(filename)
  8.     if err != nil {
  9.         return err
  10.     }
  11.     err = pem.Encode(file, block)
  12.     if err != nil {
  13.         return err
  14.     }
  15.     return nil
  16. }

公钥的处理方式相同：

  1. func (p *PemKey) savePublicKey(publicKey *rsa.PublicKey, filename string) error {
  2.     raw, err := x509.MarshalPKIXPublicKey(publicKey)
  3.     if err != nil {
  4.         return err
  5.     }
  6.     block := &pem.Block{
  7.         Type:  "PUBLIC KEY",
  8.         Bytes: raw,
  9.     }
  10.     file, err := os.Create(filename)
  11.     if err != nil {
  12.         return err
  13.     }
  14.     err = pem.Encode(file, block)
  15.     if err != nil {
  16.         return err
  17.     }
  18.     return nil
  19. }
英文:

You would need pem.Encode. An example can be seen in maplepie/rsa#savePrivateKey():

  1. func (p *PemKey) savePrivateKey(privateKey *rsa.PrivateKey, filename string) error {
  2. 	raw := x509.MarshalPKCS1PrivateKey(privateKey)
  3. 	block := &pem.Block{
  4. 		Type:  "RSA PRIVATE KEY",
  5. 		Bytes: raw,
  6. 	}
  7. 	file, err := os.Create(filename)
  8. 	if err != nil {
  9. 		return err
  10. 	}
  11. 	err = pem.Encode(file, block)
  12. 	if err != nil {
  13. 		return err
  14. 	}
  15. 	return nil
  16. }

Same idea for public key:

  1. func (p *PemKey) savePublicKey(publicKey *rsa.PublicKey, filename string) error {
  2. 	raw, err := x509.MarshalPKIXPublicKey(publicKey)
  3. 	if err != nil {
  4. 		return err
  5. 	}
  6. 	block := &pem.Block{
  7. 		Type:  "PUBLIC KEY",
  8. 		Bytes: raw,
  9. 	}
  10. 	file, err := os.Create(filename)
  11. 	if err != nil {
  12. 		return err
  13. 	}
  14. 	err = pem.Encode(file, block)
  15. 	if err != nil {
  16. 		return err
  17. 	}
  18. 	return nil
  19. }

huangapple
  • 本文由 发表于 2022年10月29日 14:37:39
  • 转载请务必保留本文链接：https://go.coder-hub.com/74243311.html
  • cryptography
  • go
  • private-key
  • public-key
  • rsa
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