Add MD5 hash function

CPP/7zip/Bundles/Format7zF/Arc.mak

@@ -4,6 +4,7 @@ COMMON_OBJS = \
   $O\CrcReg.obj \
   $O\DynLimBuf.obj \
   $O\IntToString.obj \
+  $O\MD5Reg.obj \
   $O\MyMap.obj \
   $O\MyString.obj \
   $O\MyVector.obj \
@@ -289,6 +290,7 @@ C_OBJS = \
   $O\XzDec.obj \
   $O\XzEnc.obj \
   $O\XzIn.obj \
+  $O\md5.obj \
 
 !include "../../Aes.mak"
 !include "../../Crc.mak"

CPP/7zip/Bundles/Format7zFO/Arc.mak

@@ -4,6 +4,7 @@ COMMON_OBJS = \
   $O\CrcReg.obj \
   $O\DynLimBuf.obj \
   $O\IntToString.obj \
+  $O\MD5Reg.obj \
   $O\MyMap.obj \
   $O\MyString.obj \
   $O\MyVector.obj \
@@ -287,6 +288,7 @@ C_OBJS = \
   $O\XzDec.obj \
   $O\XzEnc.obj \
   $O\XzIn.obj \
+  $O\md5.obj \
 
 !include "../../Aes.mak"
 !include "../../Crc.mak"

CPP/7zip/UI/Explorer/ContextMenu.cpp

@@ -223,6 +223,7 @@ static const CHashCommand g_HashCommands[] =
 {
   { CZipContextMenu::kHash_CRC32,    "CRC-32",   "CRC32" },
   { CZipContextMenu::kHash_CRC64,    "CRC-64",   "CRC64" },
+  { CZipContextMenu::kHash_MD5,      "MD5",      "MD5" },
   { CZipContextMenu::kHash_SHA1,     "SHA-1",    "SHA1" },
   { CZipContextMenu::kHash_SHA256,   "SHA-256",  "SHA256" },
   { CZipContextMenu::kHash_BLAKE2sp, "BLAKE2sp", "BLAKE2sp" },
@@ -934,6 +935,7 @@ STDMETHODIMP CZipContextMenu::InvokeCommand(LPCMINVOKECOMMANDINFO commandInfo)
       case kHash_BLAKE2sp:
       case kHash_XXH32:
       case kHash_XXH64:
+      case kHash_MD5:
       case kHash_All:
       {
         for (unsigned i = 0; i < ARRAY_SIZE(g_HashCommands); i++)

CPP/7zip/UI/Explorer/ContextMenu.h

@@ -34,6 +34,7 @@ public:
     kCompressToZipEmail,
     kHash_CRC32,
     kHash_CRC64,
+    kHash_MD5,
     kHash_SHA1,
     kHash_SHA256,
     kHash_BLAKE2sp,

CPP/Common/MD5Reg.cpp

@@ -0,0 +1,40 @@
+// MD5Reg.cpp
+
+#include "StdAfx.h"
+
+#include "../../C/md5.h"
+
+#include "../Common/MyCom.h"
+
+#include "../7zip/Common/RegisterCodec.h"
+
+class CMD5Hasher:
+  public IHasher,
+  public CMyUnknownImp
+{
+  MD5_CTX _ctx;
+  Byte mtDummy[1 << 7];
+  
+public:
+  CMD5Hasher() { MD5_Init(&_ctx); }
+
+  MY_UNKNOWN_IMP1(IHasher)
+  INTERFACE_IHasher(;)
+};
+
+STDMETHODIMP_(void) CMD5Hasher::Init() throw()
+{
+  MD5_Init(&_ctx);
+}
+
+STDMETHODIMP_(void) CMD5Hasher::Update(const void *data, UInt32 size) throw()
+{
+  MD5_Update(&_ctx, (const Byte *)data, size);
+}
+
+STDMETHODIMP_(void) CMD5Hasher::Final(Byte *digest) throw()
+{
+  MD5_Final(&_ctx, digest);
+}
+
+REGISTER_HASHER(CMD5Hasher, 0x205, "MD5", 16)