creating public key from RSA private key

RSA key generation and signature test

src/libstrongswan/plugins/gmp/gmp_rsa_public_key.c

@@ -454,6 +454,26 @@ bool gmp_rsa_public_key_build_id(mpz_t n, mpz_t e, identification_t **keyid,
 	return TRUE;
 }
 
+/**
+ * Create a public key from mpz values, used in gmp_rsa_private_key
+ */
+gmp_rsa_public_key_t *gmp_rsa_public_key_create_from_n_e(mpz_t n, mpz_t e)
+{
+	private_gmp_rsa_public_key_t *this = gmp_rsa_public_key_create_empty();
+
+	mpz_init_set(this->n, n);
+	mpz_init_set(this->e, e);
+	
+	this->k = (mpz_sizeinbase(this->n, 2) + 7) / 8;
+	if (!gmp_rsa_public_key_build_id(this->n, this->e,
+									 &this->keyid, &this->keyid_info))
+	{
+		destroy(this);
+		return NULL;
+	}
+	return &this->public;
+}
+
 /**
  * Load a public key from an ASN1 encoded blob
  */