From d097742155873c8597f1b5adcce95fa17f135002 Mon Sep 17 00:00:00 2001
From: Dominik Riebeling <Dominik.Riebeling@gmail.com>
Date: Sat, 8 Aug 2020 22:05:44 +0200
Subject: sbtools: Change crypto wrapper implementation to C.

There's nothing C++ left.

Change-Id: I98d8406215287c02b56029ed7c0e2b0e645bbcf1
---
 utils/imxtools/sbtools/crypto.c | 126 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 utils/imxtools/sbtools/crypto.c

(limited to 'utils/imxtools/sbtools/crypto.c')

diff --git a/utils/imxtools/sbtools/crypto.c b/utils/imxtools/sbtools/crypto.c
new file mode 100644
index 0000000000..d3ec18bd11
--- /dev/null
+++ b/utils/imxtools/sbtools/crypto.c
@@ -0,0 +1,126 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2016 Amaury Pouly
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "crypto.h"
+#include "misc.h"
+
+#include "tomcrypt.h"
+
+
+
+enum crypto_method_t g_cur_method = CRYPTO_NONE;
+uint8_t g_key[16];
+
+int cbc_mac2(
+    const uint8_t *in_data, /* Input data */
+    uint8_t *out_data, /* Output data (or NULL) */
+    int nr_blocks, /* Number of blocks to encrypt/decrypt (one block=16 bytes) */
+    uint8_t key[16], /* Key */
+    uint8_t iv[16], /* Initialisation Vector */
+    uint8_t (*out_cbc_mac)[16], /* CBC-MAC of the result (or NULL) */
+    bool encrypt /* 1 to encrypt, 0 to decrypt */
+    )
+{
+    int cipher = register_cipher(&aes_desc);
+    symmetric_CBC cbc;
+    cbc_start(cipher, iv, key, 16, 0, &cbc);
+
+    /* encrypt */
+    if(encrypt)
+    {
+        uint8_t tmp[16];
+        /* we need some output buffer, either a temporary one if we are CBC-MACing
+         * only, or use output buffer if available */
+        uint8_t *out_ptr = (out_data == NULL) ? tmp : out_data;
+        while(nr_blocks-- > 0)
+        {
+            cbc_encrypt(in_data, out_ptr, 16, &cbc);
+            /* if this is the last block, copy CBC-MAC */
+            if(nr_blocks == 0 && out_cbc_mac)
+                memcpy(out_cbc_mac, out_ptr, 16);
+            /* if we are writing data to the output buffer, advance output pointer */
+            if(out_data != NULL)
+                out_ptr += 16;
+            in_data += 16;
+        }
+        return CRYPTO_ERROR_SUCCESS;
+    }
+    /* decrypt */
+    else
+    {
+        cbc_decrypt(in_data, out_data, nr_blocks * 16, &cbc);
+
+        /* update keys if neeeded */
+        /* we cannot produce a CBC-MAC in decrypt mode, output buffer exists */
+        if(out_cbc_mac || out_data == NULL)
+            return CRYPTO_ERROR_INVALID_OP;
+
+        return CRYPTO_ERROR_SUCCESS;
+    }
+}
+
+
+int crypto_setup(struct crypto_key_t *key)
+{
+    g_cur_method = key->method;
+    switch(g_cur_method)
+    {
+        case CRYPTO_KEY:
+            memcpy(g_key, key->u.key, 16);
+
+            return CRYPTO_ERROR_SUCCESS;
+        default:
+            return CRYPTO_ERROR_BADSETUP;
+    }
+}
+
+int crypto_apply(
+    uint8_t *in_data, /* Input data */
+    uint8_t *out_data, /* Output data (or NULL) */
+    int nr_blocks, /* Number of blocks (one block=16 bytes) */
+    uint8_t iv[16], /* Key */
+    uint8_t (*out_cbc_mac)[16], /* CBC-MAC of the result (or NULL) */
+    bool encrypt)
+{
+    if(g_cur_method == CRYPTO_KEY)
+        return cbc_mac2(in_data, out_data, nr_blocks, g_key, iv, out_cbc_mac, encrypt);
+    else
+        return CRYPTO_ERROR_BADSETUP;
+}
+
+void sha_1_init(struct sha_1_params_t *params)
+{
+    sha1_init(&params->state);
+}
+
+void sha_1_update(struct sha_1_params_t *params, uint8_t *buffer, int size)
+{
+    sha1_process(&params->state, buffer, size);
+}
+
+void sha_1_finish(struct sha_1_params_t *params)
+{
+    sha1_done(&params->state, params->hash);
+}
+
+void sha_1_output(struct sha_1_params_t *params, uint8_t *out)
+{
+    memcpy(out, params->hash, 20);
+}
-- 
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