Golang : Encrypt and decrypt data with x509 crypto
This is a simple tutorial demonstrating how to encrypt and decrypt string data with Golang's crypto/x509
package. We will use the EncryptPEMBlock and DecryptPEMBlock functions.
The source code :
package main
import (
"fmt"
"crypto/rand"
"crypto/x509"
"os"
)
func main() {
blockType := "RSA PRIVATE KEY"
password := []byte("password")
// see http://golang.org/pkg/crypto/x509/#pkg-constants
cipherType := x509.PEMCipherAES256
EncryptedPEMBlock, err := x509.EncryptPEMBlock(rand.Reader,
blockType,
[]byte("secret message"),
password,
cipherType)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// check if encryption is successful or not
if !x509.IsEncryptedPEMBlock(EncryptedPEMBlock) {
fmt.Println("PEM Block is not encrypted!")
os.Exit(1)
}
if EncryptedPEMBlock.Type != blockType {
fmt.Println("Block type is wrong!")
os.Exit(1)
}
fmt.Printf("Encrypted block \n%v\n", EncryptedPEMBlock)
fmt.Printf("Encrypted Block Headers Info : %v\n", EncryptedPEMBlock.Headers)
DecryptedPEMBlock, err := x509.DecryptPEMBlock(EncryptedPEMBlock, password)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Printf("Decrypted block message is : \n%s\n", DecryptedPEMBlock)
}
Sample output :
Encrypted block &{RSA PRIVATE KEY map[Proc-Type:4,ENCRYPTED DEK-Info:AES-256-CBC,9f08b2afcf44a3115f8eacc78600a108] [133 90 249 15 68 167 149 212 114 250 51 248 47 5 137 144]}
Encrypted Block Headers Info : map[Proc-Type:4,ENCRYPTED DEK-Info:AES-256-CBC,9f08b2afcf44a3115f8eacc78600a108]
Decrypted block message is : secret message
See also : Golang : Create x509 certificate, private and public keys
By Adam Ng
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