From f19f813537c7aea1c20749c914e756b54a9c3cf5 Mon Sep 17 00:00:00 2001
From: Igor Pavlov <87184205+ip7z@users.noreply.github.com>
Date: Mon, 27 Dec 2021 00:00:00 +0000
Subject: '21.07'

---
 C/Sha256.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 C/Sha256.h

(limited to 'C/Sha256.h')

diff --git a/C/Sha256.h b/C/Sha256.h
new file mode 100644
index 0000000..aa38501
--- /dev/null
+++ b/C/Sha256.h
@@ -0,0 +1,76 @@
+/* Sha256.h -- SHA-256 Hash
+2021-01-01 : Igor Pavlov : Public domain */
+
+#ifndef __7Z_SHA256_H
+#define __7Z_SHA256_H
+
+#include "7zTypes.h"
+
+EXTERN_C_BEGIN
+
+#define SHA256_NUM_BLOCK_WORDS  16
+#define SHA256_NUM_DIGEST_WORDS  8
+
+#define SHA256_BLOCK_SIZE   (SHA256_NUM_BLOCK_WORDS * 4)
+#define SHA256_DIGEST_SIZE  (SHA256_NUM_DIGEST_WORDS * 4)
+
+typedef void (MY_FAST_CALL *SHA256_FUNC_UPDATE_BLOCKS)(UInt32 state[8], const Byte *data, size_t numBlocks);
+
+/*
+  if (the system supports different SHA256 code implementations)
+  {
+    (CSha256::func_UpdateBlocks) will be used
+    (CSha256::func_UpdateBlocks) can be set by
+       Sha256_Init()        - to default (fastest)
+       Sha256_SetFunction() - to any algo
+  }
+  else
+  {
+    (CSha256::func_UpdateBlocks) is ignored.
+  }
+*/
+
+typedef struct
+{
+  SHA256_FUNC_UPDATE_BLOCKS func_UpdateBlocks;
+  UInt64 count;
+  UInt64 __pad_2[2];
+  UInt32 state[SHA256_NUM_DIGEST_WORDS];
+
+  Byte buffer[SHA256_BLOCK_SIZE];
+} CSha256;
+
+
+#define SHA256_ALGO_DEFAULT 0
+#define SHA256_ALGO_SW      1
+#define SHA256_ALGO_HW      2
+
+/*
+Sha256_SetFunction()
+return:
+  0 - (algo) value is not supported, and func_UpdateBlocks was not changed
+  1 - func_UpdateBlocks was set according (algo) value.
+*/
+
+BoolInt Sha256_SetFunction(CSha256 *p, unsigned algo);
+
+void Sha256_InitState(CSha256 *p);
+void Sha256_Init(CSha256 *p);
+void Sha256_Update(CSha256 *p, const Byte *data, size_t size);
+void Sha256_Final(CSha256 *p, Byte *digest);
+
+
+
+
+// void MY_FAST_CALL Sha256_UpdateBlocks(UInt32 state[8], const Byte *data, size_t numBlocks);
+
+/*
+call Sha256Prepare() once at program start.
+It prepares all supported implementations, and detects the fastest implementation.
+*/
+
+void Sha256Prepare(void);
+
+EXTERN_C_END
+
+#endif
-- 
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