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key.go
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key.go
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// MIT License
//
// Copyright (c) 2020, Kairo de Araujo
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// Package key provides RSA Key API management for crypto/x509/rsa.
//
// This package makes easy to generate Keys and load RSA from files to be
// used by GoLang applications.
//
// Generating RSA Keys, the files will be saved in the $CAPATH by default.
// For $CAPATH, please check out the GoCA documentation.
package key
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
)
// KeysData represents the RSA keys with Private Key (Key) and Public Key (Public Key).
type KeysData struct {
Key *rsa.PrivateKey
PublicKey *rsa.PublicKey
}
// CreateKeys creates RSA private and public keyData that contains Key and PublicKey.
func CreateKeys(CACommonName, commonName string, bitSize int) (KeysData, error) {
reader := rand.Reader
if bitSize == 0 {
bitSize = 2048
}
key, err := rsa.GenerateKey(reader, bitSize)
if err != nil {
return KeysData{}, err
}
keys := KeysData{
Key: key,
PublicKey: &key.PublicKey,
}
return keys, nil
}
// LoadPrivateKey loads a RSA Private Key from a pem contend.
func LoadPrivateKeyFromPem(keyPem []byte) (*rsa.PrivateKey, error) {
block, _ := pem.Decode([]byte(string(keyPem)))
privateKey, _ := x509.ParsePKCS1PrivateKey(block.Bytes)
return privateKey, nil
}
// LoadPublicKey loads a RSA Public Key from a pem contend.
func LoadPublicKeyFromPem(keyPem []byte) (*rsa.PublicKey, error) {
block, _ := pem.Decode([]byte(string(keyPem)))
publicKey, _ := x509.ParsePKCS1PublicKey(block.Bytes)
return publicKey, nil
}
// ConvertPrivateKeyFromDerToPem permit to convert private key from DER format to PEM format
func ConvertPrivateKeyFromDerToPem(privateKey *rsa.PrivateKey) (privateKeyPem []byte, err error) {
pemPrivateKey := &pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(privateKey),
}
var pemBuff bytes.Buffer
err = pem.Encode(&pemBuff, pemPrivateKey)
if err != nil {
return nil, err
}
return pemBuff.Bytes(), nil
}
// ConvertPrivateKeyFromDerToPem permit to convert public key from DER format to PEM format
func ConvertPublicKeyFromDerToPem(publicKey *rsa.PublicKey) (publicKeyPem []byte, err error) {
asn1Bytes, err := asn1.Marshal(*publicKey)
if err != nil {
return nil, err
}
pemPublickey := &pem.Block{
Type: "PUBLIC KEY",
Bytes: asn1Bytes,
}
var pemBuff bytes.Buffer
err = pem.Encode(&pemBuff, pemPublickey)
if err != nil {
return nil, err
}
return pemBuff.Bytes(), nil
}