chore: checkpoint before Python removal

vendor/aws-lc-sys/aws-lc/crypto/cipher_extra/e_null.c

@@ -0,0 +1,37 @@
+// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+#include <openssl/cipher.h>
+
+#include <string.h>
+
+#include <openssl/nid.h>
+
+#include "../fipsmodule/cipher/internal.h"
+#include "../internal.h"
+
+
+static int null_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
+                         const uint8_t *iv, int enc) {
+  return 1;
+}
+
+static int null_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
+                       const uint8_t *in, size_t in_len) {
+  if (in != out) {
+    OPENSSL_memcpy(out, in, in_len);
+  }
+  return 1;
+}
+
+static const EVP_CIPHER n_cipher = {
+    .nid = NID_undef,
+    .block_size = 1,
+    .key_len = 0,
+    .iv_len = 0,
+    .ctx_size = 0,
+    .init = null_init_key,
+    .cipher = null_cipher,
+};
+
+const EVP_CIPHER *EVP_enc_null(void) { return &n_cipher; }