Refactor cipher aes_cts code so that it can be used by other 128bit ciphers

Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16286)

1 files changed, 52 insertions, 0 deletions

diff --git a/providers/implementations/ciphers/cipher_cts.h b/providers/implementations/ciphers/cipher_cts.h
new file mode 100644
index 0000000000..9473fbde88
--- /dev/null
+++ b/providers/implementations/ciphers/cipher_cts.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include "crypto/evp.h"
+
+/* NOTE: The underlying block cipher is CBC so we reuse most of the code */
+#define IMPLEMENT_cts_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits,         \
+                             blkbits, ivbits, typ)                             \
+static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params;   \
+static int alg##_cts_##kbits##_##lcmode##_get_params(OSSL_PARAM params[])      \
+{                                                                              \
+    return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,    \
+                                          flags, kbits, blkbits, ivbits);      \
+}                                                                              \
+const OSSL_DISPATCH ossl_##alg##kbits##lcmode##_cts_functions[] = {            \
+    { OSSL_FUNC_CIPHER_NEWCTX,                                                 \
+      (void (*)(void)) alg##_##kbits##_##lcmode##_newctx },                    \
+    { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx },              \
+    { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx },                \
+    { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void)) alg##_cbc_cts_einit },   \
+    { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void)) alg##_cbc_cts_dinit },   \
+    { OSSL_FUNC_CIPHER_UPDATE,                                                 \
+      (void (*)(void)) ossl_cipher_cbc_cts_block_update },                     \
+    { OSSL_FUNC_CIPHER_FINAL,                                                  \
+      (void (*)(void)) ossl_cipher_cbc_cts_block_final },                      \
+    { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))ossl_cipher_generic_cipher },   \
+    { OSSL_FUNC_CIPHER_GET_PARAMS,                                             \
+      (void (*)(void)) alg##_cts_##kbits##_##lcmode##_get_params },            \
+    { OSSL_FUNC_CIPHER_GETTABLE_PARAMS,                                        \
+      (void (*)(void))ossl_cipher_generic_gettable_params },                   \
+    { OSSL_FUNC_CIPHER_GET_CTX_PARAMS,                                         \
+      (void (*)(void)) alg##_cbc_cts_get_ctx_params },                         \
+    { OSSL_FUNC_CIPHER_SET_CTX_PARAMS,                                         \
+      (void (*)(void)) alg##_cbc_cts_set_ctx_params },                         \
+    { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,                                    \
+      (void (*)(void)) alg##_cbc_cts_gettable_ctx_params },                    \
+    { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,                                    \
+     (void (*)(void)) alg##_cbc_cts_settable_ctx_params },                     \
+    { 0, NULL }                                                                \
+};
+
+OSSL_FUNC_cipher_update_fn ossl_cipher_cbc_cts_block_update;
+OSSL_FUNC_cipher_final_fn ossl_cipher_cbc_cts_block_final;
+
+const char *ossl_cipher_cbc_cts_mode_id2name(unsigned int id);
+int ossl_cipher_cbc_cts_mode_name2id(const char *name);