Add SHA3 hashing

- added these variants: SHA3-256, SHA3-384, SHA3-512
- reordered also the hashing id's
- added some notes about them in DOC/Hashes.txt

Signed-off-by: Tino Reichardt <milky-7zip@mcmilk.de>

CPP/Common/Sha3-256Reg.cpp

@@ -0,0 +1,43 @@
+// Sha3-256Reg.cpp /TR 2023-06-18
+
+#include "StdAfx.h"
+
+#include "../../C/CpuArch.h"
+
+EXTERN_C_BEGIN
+#include "../../C/hashes/sha3.h"
+EXTERN_C_END
+
+#include "../Common/MyCom.h"
+#include "../7zip/Common/RegisterCodec.h"
+
+// SHA3-256
+class CSHA3_256Hasher:
+  public IHasher,
+  public CMyUnknownImp
+{
+  SHA3_CTX _ctx;
+  Byte mtDummy[1 << 7];
+
+public:
+  CSHA3_256Hasher() { SHA3_Init(&_ctx, 256); }
+
+  MY_UNKNOWN_IMP1(IHasher)
+  INTERFACE_IHasher(;)
+};
+
+STDMETHODIMP_(void) CSHA3_256Hasher::Init() throw()
+{
+  SHA3_Init(&_ctx, 256);
+}
+
+STDMETHODIMP_(void) CSHA3_256Hasher::Update(const void *data, UInt32 size) throw()
+{
+  SHA3_Update(&_ctx, (const Byte *)data, size);
+}
+
+STDMETHODIMP_(void) CSHA3_256Hasher::Final(Byte *digest) throw()
+{
+  SHA3_Final(digest, &_ctx);
+}
+REGISTER_HASHER(CSHA3_256Hasher, 0x20a, "SHA3-256", SHA3_256_DIGEST_LENGTH)