rsa.go

Documentation: edge-infra.dev/pkg/edge/edgeencrypt

     1  package edgeencrypt
     2  
     3  import (
     4  	"crypto/rand"
     5  	"crypto/rsa"
     6  	"crypto/x509"
     7  	"encoding/pem"
     8  	"fmt"
     9  )
    10  
    11  const (
    12  	RSA2048 = 2048
    13  )
    14  
    15  // GenerateRandomRSAKeyPair generates a random RSA key pair: private and public keys
    16  func GenerateRandomRSAKeyPair() (string, string, error) {
    17  	privateKey, err := rsa.GenerateKey(rand.Reader, RSA2048)
    18  	if err != nil {
    19  		return "", "", fmt.Errorf("failed to generate private key: %w", err)
    20  	}
    21  	publicKey := &privateKey.PublicKey
    22  
    23  	pubKeyString, err := ConvertRSAPublicKeyToPEM(publicKey)
    24  	if err != nil {
    25  		return "", "", fmt.Errorf("failed to convert public key to string: %w", err)
    26  	}
    27  
    28  	pkString := ConvertRSAPrivateKeyToPEM(privateKey)
    29  
    30  	return pkString, pubKeyString, nil
    31  }
    32  
    33  // ConvertRSAPublicKeyToPEM converts rsa.PublicKey to pem format
    34  func ConvertRSAPublicKeyToPEM(key *rsa.PublicKey) (string, error) {
    35  	block, err := x509.MarshalPKIXPublicKey(key)
    36  	if err != nil {
    37  		return "", fmt.Errorf("failed to marshal public key: %w", err)
    38  	}
    39  	pubPEM := pem.EncodeToMemory(&pem.Block{
    40  		Type:  "PUBLIC KEY",
    41  		Bytes: block,
    42  	})
    43  	return string(pubPEM), nil
    44  }
    45  
    46  // ConvertRSAPrivateKeyToPEM converts rsa.PrivateKey to pem format
    47  func ConvertRSAPrivateKeyToPEM(key *rsa.PrivateKey) string {
    48  	block := x509.MarshalPKCS1PrivateKey(key)
    49  	privateKey := pem.EncodeToMemory(&pem.Block{
    50  		Type:  "RSA PRIVATE KEY",
    51  		Bytes: block,
    52  	})
    53  	return string(privateKey)
    54  }
    55
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