1 files changed, 34 insertions, 0 deletions
diff --git a/tools/pubkey.go b/tools/pubkey.go
new file mode 100644
index 0000000..4649664
--- /dev/null
+++ b/tools/pubkey.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"crypto/x509"
+	"encoding/pem"
+	"fmt"
+	"log"
+	"os"
+)
+
+func main() {
+	keyFile := "key.pem"
+	if len(os.Args) > 1 {
+		keyFile = os.Args[1]
+	}
+
+	keyData, err := os.ReadFile(keyFile)
+	if err != nil {
+		log.Panicf("failed to read key \"%v\": %v", keyFile, err)
+	}
+
+	keyBlock, _ := pem.Decode(keyData)
+	if keyBlock == nil {
+		log.Panicf("key \"%v\" is empty")
+	}
+
+	privateKey, err := x509.ParsePKCS1PrivateKey(keyBlock.Bytes)
+	if err != nil {
+		log.Panic("failed to read PKCS1 RSA private key: %v", err)
+	}
+
+	fmt.Println("N", privateKey.N)
+	fmt.Println("E", privateKey.E)
+}