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/Sha1.h | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 C/Sha1.h

(limited to 'C/Sha1.h')

diff --git a/C/Sha1.h b/C/Sha1.h
new file mode 100644
index 0000000..345a816
--- /dev/null
+++ b/C/Sha1.h
@@ -0,0 +1,76 @@
+/* Sha1.h -- SHA-1 Hash
+2021-02-08 : Igor Pavlov : Public domain */
+
+#ifndef __7Z_SHA1_H
+#define __7Z_SHA1_H
+
+#include "7zTypes.h"
+
+EXTERN_C_BEGIN
+
+#define SHA1_NUM_BLOCK_WORDS  16
+#define SHA1_NUM_DIGEST_WORDS  5
+
+#define SHA1_BLOCK_SIZE   (SHA1_NUM_BLOCK_WORDS * 4)
+#define SHA1_DIGEST_SIZE  (SHA1_NUM_DIGEST_WORDS * 4)
+
+typedef void (MY_FAST_CALL *SHA1_FUNC_UPDATE_BLOCKS)(UInt32 state[5], const Byte *data, size_t numBlocks);
+
+/*
+  if (the system supports different SHA1 code implementations)
+  {
+    (CSha1::func_UpdateBlocks) will be used
+    (CSha1::func_UpdateBlocks) can be set by
+       Sha1_Init()        - to default (fastest)
+       Sha1_SetFunction() - to any algo
+  }
+  else
+  {
+    (CSha1::func_UpdateBlocks) is ignored.
+  }
+*/
+
+typedef struct
+{
+  SHA1_FUNC_UPDATE_BLOCKS func_UpdateBlocks;
+  UInt64 count;
+  UInt64 __pad_2[2];
+  UInt32 state[SHA1_NUM_DIGEST_WORDS];
+  UInt32 __pad_3[3];
+  Byte buffer[SHA1_BLOCK_SIZE];
+} CSha1;
+
+
+#define SHA1_ALGO_DEFAULT 0
+#define SHA1_ALGO_SW      1
+#define SHA1_ALGO_HW      2
+
+/*
+Sha1_SetFunction()
+return:
+  0 - (algo) value is not supported, and func_UpdateBlocks was not changed
+  1 - func_UpdateBlocks was set according (algo) value.
+*/
+
+BoolInt Sha1_SetFunction(CSha1 *p, unsigned algo);
+
+void Sha1_InitState(CSha1 *p);
+void Sha1_Init(CSha1 *p);
+void Sha1_Update(CSha1 *p, const Byte *data, size_t size);
+void Sha1_Final(CSha1 *p, Byte *digest);
+
+void Sha1_PrepareBlock(const CSha1 *p, Byte *block, unsigned size);
+void Sha1_GetBlockDigest(const CSha1 *p, const Byte *data, Byte *destDigest);
+
+// void MY_FAST_CALL Sha1_UpdateBlocks(UInt32 state[5], const Byte *data, size_t numBlocks);
+
+/*
+call Sha1Prepare() once at program start.
+It prepares all supported implementations, and detects the fastest implementation.
+*/
+
+void Sha1Prepare(void);
+
+EXTERN_C_END
+
+#endif
-- 
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