/
main.go
52 lines (45 loc) · 1.26 KB
/
main.go
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package main
import (
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha256"
"fmt"
"log"
)
func main() {
var (
err error
privateKey *rsa.PrivateKey
publicKey *rsa.PublicKey
message, plaintext, ciphertext, signature, label []byte
)
if privateKey, err = rsa.GenerateKey(rand.Reader, 2048); err != nil {
log.Fatalln(err)
}
publicKey = &privateKey.PublicKey
label = []byte("")
message = []byte("Some super secret message, maybe a session key even")
ciphertext, err = rsa.EncryptOAEP(sha256.New(), rand.Reader, publicKey, message, label)
if err != nil {
log.Fatalln(err)
}
fmt.Printf("Ciphertext: %x\n", ciphertext)
plaintext, err = rsa.DecryptOAEP(sha256.New(), rand.Reader, privateKey, ciphertext, label)
if err != nil {
log.Fatalln(err)
}
fmt.Printf("Plaintext: %s\n", plaintext)
h := sha256.New()
h.Write(message)
signature, err = rsa.SignPSS(rand.Reader, privateKey, crypto.SHA256, h.Sum(nil), nil)
if err != nil {
log.Fatalln(err)
}
fmt.Printf("Signature: %x\n", signature)
err = rsa.VerifyPSS(publicKey, crypto.SHA256, h.Sum(nil), signature, nil)
if err != nil {
log.Fatalln(err)
}
fmt.Println("Signature verified")
}