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authorBobTheBob <32057864+BobTheBob9@users.noreply.github.com>2021-12-19 03:13:28 +0000
committerBobTheBob <32057864+BobTheBob9@users.noreply.github.com>2021-12-19 03:13:28 +0000
commit75b9583a6b66c09596f4c0a25188ba4d99ca34da (patch)
tree4eef5ac3c28faa511d08be350f6bc028d5ebc290 /NorthstarDedicatedTest/include/crypto/chacha.h
parent682a00eaac30139929b1bb179ae7f4aa1a038572 (diff)
downloadNorthstarLauncher-75b9583a6b66c09596f4c0a25188ba4d99ca34da.tar.gz
NorthstarLauncher-75b9583a6b66c09596f4c0a25188ba4d99ca34da.zip
openssl support
Diffstat (limited to 'NorthstarDedicatedTest/include/crypto/chacha.h')
-rw-r--r--NorthstarDedicatedTest/include/crypto/chacha.h43
1 files changed, 43 insertions, 0 deletions
diff --git a/NorthstarDedicatedTest/include/crypto/chacha.h b/NorthstarDedicatedTest/include/crypto/chacha.h
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+/*
+ * Copyright 2015-2021 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
+ */
+
+#ifndef OSSL_CRYPTO_CHACHA_H
+#define OSSL_CRYPTO_CHACHA_H
+# pragma once
+
+#include <stddef.h>
+
+/*
+ * ChaCha20_ctr32 encrypts |len| bytes from |inp| with the given key and
+ * nonce and writes the result to |out|, which may be equal to |inp|.
+ * The |key| is not 32 bytes of verbatim key material though, but the
+ * said material collected into 8 32-bit elements array in host byte
+ * order. Same approach applies to nonce: the |counter| argument is
+ * pointer to concatenated nonce and counter values collected into 4
+ * 32-bit elements. This, passing crypto material collected into 32-bit
+ * elements as opposite to passing verbatim byte vectors, is chosen for
+ * efficiency in multi-call scenarios.
+ */
+void ChaCha20_ctr32(unsigned char *out, const unsigned char *inp,
+ size_t len, const unsigned int key[8],
+ const unsigned int counter[4]);
+/*
+ * You can notice that there is no key setup procedure. Because it's
+ * as trivial as collecting bytes into 32-bit elements, it's reckoned
+ * that below macro is sufficient.
+ */
+#define CHACHA_U8TOU32(p) ( \
+ ((unsigned int)(p)[0]) | ((unsigned int)(p)[1]<<8) | \
+ ((unsigned int)(p)[2]<<16) | ((unsigned int)(p)[3]<<24) )
+
+#define CHACHA_KEY_SIZE 32
+#define CHACHA_CTR_SIZE 16
+#define CHACHA_BLK_SIZE 64
+
+#endif