removed deprecated functions for rsa gen (#3)

* removed deprecated functions for rsa gen

* removed vscode

* added vscode to gitignore

Author: VishishtK

.gitignore

@@ -1,3 +1,4 @@
 openssl.test
 
-vendor
+vendor
+.vscode

key.go

@@ -15,6 +15,10 @@
 package openssl
 
 // #include "shim.h"
+// #include <openssl/rsa.h>
+//EVP_PKEY *evp_rsa_gen(uint bits) {
+//   return EVP_RSA_gen(bits);
+//}
 import "C"
 
 import (
@@ -682,23 +686,13 @@ func LoadPublicKeyFromDER(der_block []byte) (PublicKey, error) {
 
 // GenerateRSAKey generates a new RSA private key with an exponent of 3.
 func GenerateRSAKey(bits int) (PrivateKey, error) {
-	return GenerateRSAKeyWithExponent(bits, 3)
+	return GenerateRSAKeyWithExponent(bits)
 }
 
 // GenerateRSAKeyWithExponent generates a new RSA private key.
-func GenerateRSAKeyWithExponent(bits int, exponent int) (PrivateKey, error) {
-	rsa := C.RSA_generate_key(C.int(bits), C.ulong(exponent), nil, nil)
-	if rsa == nil {
-		return nil, errors.New("failed to generate RSA key")
-	}
-	key := C.X_EVP_PKEY_new()
-	if key == nil {
-		return nil, errors.New("failed to allocate EVP_PKEY")
-	}
-	if C.X_EVP_PKEY_assign_charp(key, C.EVP_PKEY_RSA, (*C.char)(unsafe.Pointer(rsa))) != 1 {
-		C.X_EVP_PKEY_free(key)
-		return nil, errors.New("failed to assign RSA key")
-	}
+// GenerateRSAKeyWithExponent generates a new RSA private key.
+func GenerateRSAKeyWithExponent(bits int) (PrivateKey, error) {
+	key := C.evp_rsa_gen(C.uint(bits))
 	p := &pKey{key: key}
 	runtime.SetFinalizer(p, freePKey)
 	return p, nil

key_test.go

@@ -153,7 +153,7 @@ func TestGenerate(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	_, err = GenerateRSAKeyWithExponent(1024, 65537)
+	_, err = GenerateRSAKeyWithExponent(1024)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -412,7 +412,7 @@ func TestRSAOAEP(t *testing.T) {
 
 	t.Run("fail on decrypt with wrong key", func(t *testing.T) {
 		t.Parallel()
-		key2, err := GenerateRSAKeyWithExponent(1024, 0x10001)
+		key2, err := GenerateRSAKeyWithExponent(1024)
 		if err != nil {
 			t.Skip("failed to generate extra key")
 		}