SHA1 as RuntimeImport (part 2)

Final implementation, replacing the BCrypt
and the OpenSSl implementation that never was.

Transformations made to sha1.cpp/sha1.h:

- Removed CONTRACTL's.

- Replace Windows typedefs (not available)
  with the xplat equivalents:

    BYTE => UInt8
    DWORD => UInt32
    DWORDC => const UInt32
    BOOL => bool
    TRUE => true
    FALSE => false

- _ASSERTE => ASSERT
  
- Copy _rotl out of VCLib sources
  (_rotl() does not resolve on Unix.)

- Removed the unreferenced local "OK" (Project N build
  makes a federal case out of this.)

- Added "const" qualifier to AddData pbData.

1 files changed, 19 insertions, 4 deletions

diff --git a/src/Native/Runtime/strongname.cpp b/src/Native/Runtime/strongname.cpp
index 7718b5e28..924291767 100644
--- a/src/Native/Runtime/strongname.cpp
+++ b/src/Native/Runtime/strongname.cpp
@@ -10,20 +10,35 @@
 #include "CommonTypes.h"
 #include "CommonMacros.h"
 #include "PalRedhawkCommon.h"
+#include "PalRedhawk.h"
+#include "sha1.h"
 
 //
 // Converts a public key into a public key token, by computing the SHA1 of the public key, then taking the last 8 bytes in reverse order.
 //
 // The only legal value for "cbPublicKeyTokenOut" is 8 - this parameter exists as defense in depth.
 //
-COOP_PINVOKE_HELPER(void, RhConvertPublicKeyToPublicKeyToken, (const char* pbPublicKey, int cbPublicKey, char *pbPublicKeyTokenOut, int cbPublicKeyTokenOut))
+
+#define PUBLIC_KEY_TOKEN_LEN 8
+
+COOP_PINVOKE_HELPER(void, RhConvertPublicKeyToPublicKeyToken, (const UInt8* pbPublicKey, int cbPublicKey, UInt8 *pbPublicKeyTokenOut, int cbPublicKeyTokenOut))
 {
     ASSERT(pbPublicKey != NULL);
     ASSERT(pbPublicKeyTokenOut != NULL);
-    ASSERT(!"RhConvertPublicKeyToPublicKeyToken not yet implemented.");
 
-    // Nonsense code to keep C++ from complaining about unused parameters.
-    pbPublicKeyTokenOut[cbPublicKeyTokenOut - 1] = pbPublicKey[cbPublicKey - 1];
+    if (cbPublicKeyTokenOut != PUBLIC_KEY_TOKEN_LEN)
+    {
+        RhFailFast();
+    }
+
+    SHA1Hash sha1;
+    sha1.AddData(pbPublicKey, cbPublicKey);
+    UInt8* pHash = sha1.GetHash();
+
+    for (int i = 0; i < PUBLIC_KEY_TOKEN_LEN; i++)
+    {
+        pbPublicKeyTokenOut[i] = pHash[SHA1_HASH_SIZE - i - 1];
+    }
 
     return;
 }