Go RSA public key encryption example. Compatible with http://us3.php.net/manual/en/function.openssl-private-decrypt.php for decryption

encrypt.go

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"io/ioutil"
	"log"
	"os"
)

func main() {
	// Read the standard input
	in, err := ioutil.ReadAll(os.Stdin)
	if err != nil {
		log.Fatalf("input file: %s", err)
	}
	pemData, err := ioutil.ReadFile("pub.key")
	if err != nil {
		log.Fatalf("read key file: %s", err)
	}
	// Extract the PEM-encoded data block
	block, _ := pem.Decode(pemData)
	if block == nil {
		log.Fatalf("bad key data: %s", "not PEM-encoded")
	}
	if got, want := block.Type, "CERTIFICATE"; got != want {
		log.Fatalf("unknown key type %q, want %q", got, want)
	}
	// Decode the RSA public key
	key, err := x509.ParseCertificate(block.Bytes)
	if err != nil {
		log.Fatalf("bad private key: %s", err)
	}
	pkey := key.PublicKey.(*rsa.PublicKey)
	// Encrypt the data
	out, err := rsa.EncryptPKCS1v15(rand.Reader, pkey, in)
	if err != nil {
		log.Fatalf("decrypt: %s", err)
	}
	// Write data to output file
	fmt.Fprint(os.Stdout, string(out))
}

Late to the party, but top notch example. I was going nuts trying to do compatible encryption between Go and PHP. This Gist nailed it, thanks!

Late to the party, but top notch example. I was going nuts trying to do compatible encryption between Go and PHP. This Gist nailed it, thanks!

Lol. I don't even remember writing this. but I'm super glad it was useful to you!