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Golang RSA Key Generation
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/* | |
* Genarate rsa keys. | |
*/ | |
package main | |
import ( | |
"crypto/rand" | |
"crypto/rsa" | |
"crypto/x509" | |
"encoding/asn1" | |
"encoding/gob" | |
"encoding/pem" | |
"fmt" | |
"os" | |
) | |
func main() { | |
reader := rand.Reader | |
bitSize := 2048 | |
key, err := rsa.GenerateKey(reader, bitSize) | |
checkError(err) | |
publicKey := key.PublicKey | |
saveGobKey("private.key", key) | |
savePEMKey("private.pem", key) | |
saveGobKey("public.key", publicKey) | |
savePublicPEMKey("public.pem", publicKey) | |
} | |
func saveGobKey(fileName string, key interface{}) { | |
outFile, err := os.Create(fileName) | |
checkError(err) | |
defer outFile.Close() | |
encoder := gob.NewEncoder(outFile) | |
err = encoder.Encode(key) | |
checkError(err) | |
} | |
func savePEMKey(fileName string, key *rsa.PrivateKey) { | |
outFile, err := os.Create(fileName) | |
checkError(err) | |
defer outFile.Close() | |
var privateKey = &pem.Block{ | |
Type: "PRIVATE KEY", | |
Bytes: x509.MarshalPKCS1PrivateKey(key), | |
} | |
err = pem.Encode(outFile, privateKey) | |
checkError(err) | |
} | |
func savePublicPEMKey(fileName string, pubkey rsa.PublicKey) { | |
asn1Bytes, err := asn1.Marshal(pubkey) | |
checkError(err) | |
var pemkey = &pem.Block{ | |
Type: "PUBLIC KEY", | |
Bytes: asn1Bytes, | |
} | |
pemfile, err := os.Create(fileName) | |
checkError(err) | |
defer pemfile.Close() | |
err = pem.Encode(pemfile, pemkey) | |
checkError(err) | |
} | |
func checkError(err error) { | |
if err != nil { | |
fmt.Println("Fatal error ", err.Error()) | |
os.Exit(1) | |
} | |
} |
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