From aa4d426b4d3527d7e166df1a05058c9a4a0f6683 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org>
Date: Fri, 30 Apr 2021 00:33:56 +0200
Subject: initial/final commit

---
 openssl-1.1.0h/crypto/modes/ofb128.c | 74 ++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 openssl-1.1.0h/crypto/modes/ofb128.c

(limited to 'openssl-1.1.0h/crypto/modes/ofb128.c')

diff --git a/openssl-1.1.0h/crypto/modes/ofb128.c b/openssl-1.1.0h/crypto/modes/ofb128.c
new file mode 100644
index 0000000..8309256
--- /dev/null
+++ b/openssl-1.1.0h/crypto/modes/ofb128.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (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 <openssl/crypto.h>
+#include "modes_lcl.h"
+#include <string.h>
+
+/*
+ * The input and output encrypted as though 128bit ofb mode is being used.
+ * The extra state information to record how much of the 128bit block we have
+ * used is contained in *num;
+ */
+void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
+                           size_t len, const void *key,
+                           unsigned char ivec[16], int *num, block128_f block)
+{
+    unsigned int n;
+    size_t l = 0;
+
+    n = *num;
+
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+    if (16 % sizeof(size_t) == 0) { /* always true actually */
+        do {
+            while (n && len) {
+                *(out++) = *(in++) ^ ivec[n];
+                --len;
+                n = (n + 1) % 16;
+            }
+# if defined(STRICT_ALIGNMENT)
+            if (((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) !=
+                0)
+                break;
+# endif
+            while (len >= 16) {
+                (*block) (ivec, ivec, key);
+                for (; n < 16; n += sizeof(size_t))
+                    *(size_t *)(out + n) =
+                        *(size_t *)(in + n) ^ *(size_t *)(ivec + n);
+                len -= 16;
+                out += 16;
+                in += 16;
+                n = 0;
+            }
+            if (len) {
+                (*block) (ivec, ivec, key);
+                while (len--) {
+                    out[n] = in[n] ^ ivec[n];
+                    ++n;
+                }
+            }
+            *num = n;
+            return;
+        } while (0);
+    }
+    /* the rest would be commonly eliminated by x86* compiler */
+#endif
+    while (l < len) {
+        if (n == 0) {
+            (*block) (ivec, ivec, key);
+        }
+        out[l] = in[l] ^ ivec[n];
+        ++l;
+        n = (n + 1) % 16;
+    }
+
+    *num = n;
+}
-- 
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