pkcs7: Make sure to wipe decrypted content

src/libstrongswan/plugins/pkcs7/pkcs7_encrypted_data.c

@@ -170,7 +170,7 @@ METHOD(container_t, get_encoding, bool,
 METHOD(container_t, destroy, void,
 	private_pkcs7_encrypted_data_t *this)
 {
-	free(this->content.ptr);
+	chunk_clear(&this->content);
 	free(this->encoding.ptr);
 	free(this);
 }

src/libstrongswan/plugins/pkcs7/pkcs7_enveloped_data.c

@@ -359,7 +359,7 @@ METHOD(container_t, get_encoding, bool,
 METHOD(container_t, destroy, void,
 	private_pkcs7_enveloped_data_t *this)
 {
-	free(this->content.ptr);
+	chunk_clear(&this->content);
 	free(this->encoding.ptr);
 	free(this);
 }